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Old 22 May 2009, 06:54 PM
  #31  
bigbarry04
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sell that spec C to me ! lol great car mate.
Old 26 May 2009, 09:44 PM
  #32  
Shaun
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MAY 2009 - Engine now run-in, time for mapping
Since the engine had been put back in to the Spec C in April, the car had been run-in by Tracktive. Having just finished around 300miles of running in, the car was now ready to map for full power!!

Probably worth me saying a few things on some other mods that were carried out on the car whilst the engine was out.

1) Oil Cooler - Firstly the original Spec C oil cooler was moved to a more suitable location. It's previous location was behind the front cross member between the FMIC and Radiator. Since this is not the best place for an oil cooler it was decided to move to the top bumper air duct, which meant it would receive more air without the FMIC blocking it's path. Fairly minor job, but definately worth doing. This change required new lengths of Aeroquip hosing and the placement is very neat. Hopefully this would help to keep oil temps better controlled.

2) Air Filter Ducting - With the new air filter in place, Tracktive made a much better air feed via the front fog lamp cover. This would help to provide a clear, unobstructed path/flow of air to the new filter, which incidently only just fitted within the inner wing section. Tracktive cut out a hole in the fog lamp cover and mesh grilled it. To be honest I was very surprised at the finish as it looks like the fog lamp cover was made like this from the factory.... very professional job!

3) Fuel Rails - As previously stated, the existing parallel fuel rails had leaked. Whilst they had been re-brazed I really wanted to replace them with new rails.

So with the car ready to rock on the dyno for mapping, I organised with Tracktive to be present for this backside trembling exercise.

I arrived at Tracktive about 5:45pm to find the place shut!! Called Richard, only to be told he was out mapping my car and he has broken down. Great!!!

The car came trundling around the corner about 30 mins later, popping and banging like it was running on 3 cylinders!

Anyway.... to cut a long story short, it turned out to be a mullered fuel regulator and another one was fitted, which solved the problem. So it was on with the dyno mapping.
Old 26 May 2009, 10:13 PM
  #33  
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Tell me more!!

Lee
Old 26 May 2009, 10:22 PM
  #34  
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MAY 2009 - The dyno mapping session
I have to be honest.... I was fairly tense during this mapping session. Not because of my car running on a dyno, I mean I had been here 100's of times before, but I suspect it was to do with all the time the car had been off the road and it was only now I was on the edge of getting the Spec C back. I was also slightly hesitant on the affect that the compression changes would have on the achievable power using VPower. As I stated earlier, it was possible that the power would drop over what was previously achieved on VPower, which previously stood at a barmy 477bhp. That was quite an achievement on a standard position, drop-in turbo.

Upon the first pull on the dyno the engine sounded sweet and Richard and Matt set about the mapping changes.

After a few runs and various changes Richard called me over and told me what the engine achieved. I was told it had just made 415bhp / 432ftlb at the Hubs. I felt my heart sink. Richard immediately said "That was very good!"... I replied "You're joking right?!!". He started smiling and then stated that was at LOW boost!!! 1.5bar peak and 1.4bar held. Remember, this is on a fresh re-build, VPower and a standard fit, drop-in turbo AND Hub power. Estimates of flywheel output would be 470+bhp (based on previous runs).



I was now starting to believe!

After further mapping and more runs Richard called me over.....

He said that was about it with the mapping and the full boost side had now been finished. Because the inlet temps had gone in to the mid 40's he wanted to let the engine cool for 30mins and complete a couple of final pulls on full boost to get a more representative output.

We chatted for a while and whilst I tried to get Richard to tell me what the dyno runs on full boost had achieved, he refused to tell me and told me to wait until the engine had cooled down. That was not nice was it!!?

So.... what did it get then??!!

With the engine cooler, it was loaded up again on the dyno and the final result gave me a smile that was a long time coming.

486bhp / 512ftlb @ 2.0bar peak / 1.8bar held at the Hubs


With Hub figures this high I did not even care what the flywheel approximation would be.... this was a fantastic result on VPower.

So there you have it.... more power than I had ever had, with more response (I was yet to drive the car on the road, but I was promised I would be very impressed in this department) and requiring less boost. Richard commented that he also removed (based on the previous build VPower map) 3degs of ignition and whilst he could get more out of the engine, he was happier that the current power was being achieved with less stress.

Next item would be the road test.........
Old 26 May 2009, 11:44 PM
  #35  
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Shaun excellent figures ! So what does that equate to in flywheel power ??? Yours must be at least 600/700lbs
Old 27 May 2009, 12:37 AM
  #36  
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I suspect it is over 500 bhp now.

Will get it back to Zen for a comparison.
Old 04 June 2009, 07:22 PM
  #37  
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MAY 2009 - On the Road..... nearly
So, with the rebuild and mapping out of the way it was time to take the car back home. This was a celebration in itself, especially since the car had not been "back home" for nearly 6 months!

The last thing to do was to complete a final map check on the road and get the car MOT'd..... unfortunately this never went to plan either! lol

A date was fixed, which was to be the 2nd week in May. Whilst the plan was to get the car back asap due to entry in to ScoobySprint, previous issues happened that meant that I was unable to attend Round 1. With Round 2 less than two weeks away, it at least meant I could get some time in the car before giving it death on the start line.

Mapping took place (previous entry above) on the Monday and it was organised to pick the car up on the Thursday. To say I was a tad excited was an understatement.

As agreed I went to pick the car up on the Thursday, which required it to be all checked on the road and final tweaking of the map before I left with it.

I drove the car whilst Richard did the intelligent bit.

After completing 2 low boost full throttle runs, I then completed a full boost run which did not go as planned. Nailing it saw overboost and then no boost and then 1bar max.... ooops. Richard asked me to pull over, so he could have a look under the bonnet, but he suspected a hose had blown off.

Pulling the car in to the layby showed there were other problems as well. The car was hunting really badly, with idle revs going between 200-2000rpm. Not good. Richard had a look under the bonnet and found a hose had blown off, which he quickly placed in it's rightful location. Although this was back in place, the engine was still hunting. After a quick conversation we decided to get the car back to the workshop..... it was probably game over for this evening.

Richard did some quick investigation work back at the workshop and found the second regulator had now decided to give up, showing 100psi of pressure on ignition!!??!! This second regulator lasted 2hrs on the dyno and about 3 full pulls on the road.

Richard was just about to start an engine build for the a Time Attack EVO that he was preparing, which needed to be ready for Friday morning. Hasten to add nothing else was going to be done on mine until the following week now.
Old 04 June 2009, 07:39 PM
  #38  
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MAY 2009 - One week to go until ScoobySprint Round 2
Things were going to be tight this week, what with three cars being prepared for ScoobySprint (I was one member of the Tracktive Constructors Team) and with mine not even running properly yet!!

I had a call from Tracktive on the Tuesday, with a proposal of why I had issues. It was found that the fuel rails (supplied by a 3rd party) had debris in them. The debris was cleared and the rails were re-fitted. Since we had now gone through 2 OEM regulators, Tracktive had none left in stock so it was decided to fit an uprated external regulator. This required a bit more work to pipe and mount, but nothing major.

More stress............

I took another call from Richard early evening on the Tuesday to say that the new rails were now leaking!! Can you imagine the anquish I was going through at this point?! The car needed to be ready for me to pick up AT THE LATEST Friday, and things were not going my way.

Richard had now ordered another set of rails from a different supplier, and these ones were one piece alloy ones.

Unfortunately these ones did not fit either!!! The pain was about to end my life.

Pulling all the stops out (which is nothing new as far as Tracktive are concerned) Richard managed to get hold of another set of rails on the Friday morning. I had arranged to pick the car up that evening, after I had been out with Richard on the road. Fingers crossed that this WOULD BE IT!!! Talk about taking it to the wire!!!
Old 04 June 2009, 09:12 PM
  #39  
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MAY 2009 - Surely it is back on the road now!?
The Friday night came and I travelled to Tracktive to hopefully take the car back with me. I had been here several times before, so I was half expecting more issues. I should of had more faith though!

This time we had no issues with the car and all was fine and dandy.

The car felt absolutely ballistic.

Some people may think that being this long without this kind of power would make it "feel" quick in anycase, but believe me, I knew that old engine inside and out. Knowing how it reacted in certain situations under part throttle and through the gears etc. This was a totally different animal now with the new build. The throttle response was truly outstanding and through the gears it was crazy. Even without the compression ratio changes on the new build affecting the response (positively), the car was producing in the region of an additional 45bhp/45ftlb over what it was when I last drove it (back in October 2008) alone. This coupled with the fact that the engine was now razor sharp (because of the compression changes), made for quite a quick mover on the road!

Not many words can really describe how this new engine performs, but considering it is mapped for VPower and is powered by a relatively (to OE Subaru turbo's) large AET GT30 core and large exhaust housing, it performs at a level that I never thought possible 2yrs ago when the original build took place.

Richard said I would be pleased with how the engine performed and he was certainly right!

Unfortunately rolling road graphs only tell part of the story and until you drive the car on the road, do you find out the real impact of the changes that have been made.

Another positive affect of the compression changes were regarding the spool up. It now achieved 1bar at a tad over 2700rpm, which before it was making 1bar at circa 2900rpm. To have the kind of grunt this set-up provides lowdown and midrange, whilst still breaking 500bhp is quite an achievement in my book. The engine had evolved over 2yrs, but boy was it worth the wait and I had finally felt I had reached utopia.

So, with the car back on the road and on it's way back home, the next step was to see how the car performed at ScoobySprint in less than 48hrs time.

Last edited by Shaun; 04 June 2009 at 10:33 PM. Reason: edited a bit that did not make sense
Old 04 June 2009, 09:55 PM
  #40  
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wow!!!!

sounds a riot
Old 05 June 2009, 06:33 PM
  #41  
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Originally Posted by Shaun

Unfortunately rolling road graphs only tell part of the story and until you drive the car on the road, do you find out the real impact of the changes that have been made.

I'm sure you will get plenty to prove what its like Now when are we gonna see you at the 1/4mile track Hope fully I will have some driver training done in the next month or so
Old 05 June 2009, 08:15 PM
  #42  
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Steve,
I am resistant now to others driving my car to see what it can do..... I had 3yrs of that, starting way back when I first got the car:

2006 ScoobyLive Handling Course Shootout winner
2006 TunerGP 4th in class
2007 ScoobyLive Handling Course Top 5 place
2007 TOTB 13th overall on the handling course
2008 ScoobyLive Handling Course Top 10 place

Unfortunately these were all with other drivers (apart from TunerGP which was me).

I would rather do it the hard way now with me doing all the work.... whether I come first (I wish) or last.

The car is THE best it has ever been by a long chalk.... I just want to enjoy it and do what I should of done from the start.

Whilst I will certainly give the 1/4m a bash, I suspect I won't bother until ScoobyLive in September.... I would rather concentrate on my sprint/track stuff at the moment, as I have three rounds left of the ScoobySprint Championship to complete yet and I hope to improve each time.
Old 05 June 2009, 08:23 PM
  #43  
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So september then I'm shocking at gearchanges so it will be fun to see how bad you are

Good luck on scoobysprint
Old 05 June 2009, 08:39 PM
  #44  
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I took Simon out this week in the daily runabout and he was genuinely shocked at how much my driving had improved since before my tuition. He never thought it would improve that much, that quickly. That's alright until the red light turns to green on the start line though! It's a shame I could not of done this BEFORE I ran in ScoobySprint Round 2. Better late than never I suspect.

Gearchanges (although your tutor will tell you all this I am sure) should be smooth and your clutch and throttle should be in tandem and smooth (i.e. when coming off the clutch you should be going on the throttle). Also you should not be forcing the gearchange, as it should be able to be done with fingertip control (although this would not be the case, but don't GRAB the gearstick and cover it with your hand). i.e. use the bias spring and just guide in and out. You should be driving relaxed..... a relaxed driver makes for a relaxed car. Sounds crap, but it really is true.

Believe me.... a good tutor makes all the difference, as long as you keep practicing (which you can do in any car everyday) and totally understand the balance of you and the car, along with the affects that your inputs have and why.

I just hope it makes a lot of difference for me when it counts. I certainly feel a much smoother and confident driver on the road, but I still have a long way to go yet.

Good luck with your tuition..... I bet it will be one of the best things you have ever done and wish you had done it earlier.

Anyway..... much more about my tuition and ScoobySprint in my next thread entry!

Last edited by Shaun; 05 June 2009 at 08:43 PM.
Old 05 June 2009, 10:51 PM
  #45  
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that was the best spent 30 min reading ever......awesome amount of work involved...good luck
Old 06 June 2009, 03:35 PM
  #46  
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sounds impresive and what a great read,i bet your like a kid with a new toy lol.
Old 08 June 2009, 09:22 PM
  #47  
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MAY 2009 - Taking Check and Getting Ready for ScoobySprint
So this was it!! The car was ready and the inaugural event for the new set-up was hours away.

Most people would not be looking at running a newly built engine at a competition event..... but this IS what this car was built for. However, it is worth noting that this car is no longer a stripped out racer (as it once was). It is back to standard interior, which means ALL interior...... including a stereo system and a sub!! With tinted windows and a virtually OE look from the outside, it is a bit of a sleeper now. You can imagine the type of fun you can have with that on the road then!

As already explained, various parts of the original ancillary configuration had been changed over the past 6 months by Tracktive Solutions and although these had been nothing major, some of these modifications are worth pointing out with some much needed pictures.


Fueling System
Tracktive Parrallel Fuel Rails


SARD Uprated Adjustable Fuel Regulator



Oil Cooler
Oil Cooler now located behind the front upper bumper grill


Top down view.... only just fits in!



Inner Wing Induction Kit Air Intake
Although this does not show the massive induction kit (which only JUST fits in the inner wing), it does show the Tracktive modified Air Intake cover.



The Car - Ready for ScoobySprint


Lucky No.10



Thanks..... so far!
Tracktive Solutions - For building me an awesome engine and taking on all area's of car preparation / modification. Tracktive's enthusiasm has been a breath of fresh air!

AET Turbos - For pushing the boundaries supplying their latest spec, standard fit - drop in - turbo, which is an absolute blinder!

Litchfield Imports - For advice/ideas and supply of High Performance Cosworth engine internals.

API - For supply of parts.


Next stop..... the start line at ScoobySprint Round 2!

Last edited by Shaun; 08 June 2009 at 09:39 PM.
Old 08 June 2009, 10:59 PM
  #48  
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Dont you mean the start line at scoobysprint round 3 ?? good write up btw shaun
Old 08 June 2009, 11:35 PM
  #49  
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Nope... Round 2, as that was the first event I entered and has not been written about on this thread yet. I am still playing catch-up to present day. The thread will be bang up to date by this weekend.
Old 09 June 2009, 07:50 PM
  #50  
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Nice one shaun sorry for the mistake on my part didnt realise you were on catch up with your diary of the event.
Old 10 June 2009, 10:29 PM
  #51  
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Congrats on the massive numbers, it was a long haul I bet but worth it.
Old 10 June 2009, 11:09 PM
  #52  
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MAY 2009 - ScoobySprint Round 2 Go.. Go.. Go!
So..... instead of taking it easy and driving the "road car" on the road, I had decided some months back to enter ScoobySprint. This newly formed Sprint Championship for Subaru's is an ideal multi round, against the clock competition that would allow me to see not only how good my car was, but also how good (read BAD) my driving ability was. With classes for any type of Subaru, whether it be totally bog standard or a £500,000.00 WRC Car, the Championship caters for all types of budgets and experience. What better place to give my car a shakedown and see how I would fair against the likes of Prodrive and their WRC car!!!

Unfortunately I had missed Round 1, but that did not stop me from joining in the fun and being there to support my fellow Tracktive Solutions Constructor Team competitors. Not only was I going to be competing from Round 2, but I was also competing as part of the Tracktive Constructors Team. With the Spec C now being fully managed by Tracktive it made perfect sense!

Thankfully the Tracktive Constructor Team had already done really well at Round 1 and were running in 2nd place overall after the first event, due to the expertly driven Tracktive Demo car by Richard and Matty and of course the fantastic drive by John Felstead in his Tracktive prepared "Standard Class" Newage JDM STi.

Unfortunately the Tracktive Demo car was unable to run at Round 2 due to some issues with supplier delivery of further modifications. After Round 1, Tracktive was taking this competition seriously and decided to further develop their car for Round 2. Fortunately another one of Tracktives customers (who also owns a modified Spec C), Rob North, was able to take up the reigns. Not only does Rob own a very nice Spec C, but he is also a bit of a demon behind the wheel. John Felstead was also unable to run at Round 2, so it was imperative that we had at least one driver capable of collecting points (which would certainly not be me!).

The Tracktive Constructor Team was now made up of:

Richard Bulmer - PRO Class - Spec C RA MY02
Matty Bold - PRO Class - Spec C RA MY02
Shaun Fennings - PRO Class - Spec C RA MY03
Rob North - PRO Class - Spec C RA MY05
John Felstead - Standard Class - JDM STi MY05

Although Richard had no car to run at Round 2, he came along as the "Team Manager / Spanner Man" lol, providing track side support for both Rob and myself, providing us a nice Team Tracktive pit area. This is not the first competition event that I have competed in, but it was certainly the first that I had full support provided. It certainly made a change not to have to worry about getting my hands dirty for once. I would recommend it to anyone!! lol

Tracktive Constructors Team, Base Camp at ScoobySprint


Make no mistake, I was bricking my pants about this day!!!

I must of been a complete nutter to think I would even get anywhere at this Round, what with the fact that the car was a total beast to drive, the fact that I can't drive fullstop and of course all of this compounded by the fact that the only driving I had done in this radically changed car for the past six months, was a trip back to home from Tracktive on Friday and the trip from home to ScoobySprint Round 2 on the Sunday. Not the best combination by a long shot.... but this event is all about having fun and that is exactly what I intended in doing.

Anyway, back to the car and how I got on (I will save the real excuses until later!).....

I couldn't believe how responsive the car was on circuit...... it simply took my breath away, literally! Hats off to Tracktive for all their hard work over the past few months...... the engine is a stormer! The only way I can describe this car now, is that it is very very "angry"!!

I actually started off in low boost (1.5bar) - on my first of five timed runs - but then got silly by thinking that more boost (read - power) would make me quicker..... trying one run at 2bar soon put paid to that theory..... I was slower!! Back down to low boost for the final two runs then! Richard did advise me not to switch to full boost!

The last run was my best by far...... up to the last corner for the STOP box. It was the worst attempt by far at the last corner...... I only JUST missed a cone on the outside edge of the corner opposite the apex (what the hell was I doing there!?), after slowly down to a virtual stop. The really gripper is that even with that huge ***** up I still managed to better my previous best by .2 sec. Had I managed to get round that corner (even if it was only as good as previous runs), I could of increased that best by up to 2.0sec (Top 5 placing). Those are the breaks though..... better luck next time I suspect.

Regardless of my car spec, I am pleased with my 15th place overall (35 competitors took part) at ScoobySprint Round 2 on my first turn out in the car. We all know that the driver can make all the difference, so I appreciate it is not actually my car that is crap, it is just me! The most important thing is that the car went home in one piece and we had no issues during the day.

I was thoroughly disappointed that I had not gained any points for the team, but I needn't of worried. Rob did an absolute storming job, getting a fourth place overall. Rob managing to do that in his car, which is not as quick as mine, makes you realise what mine could be capable of doing in the right hands. Rob's sterling performance ensured that Tracktive Constructors Team was still placed 2nd at the end of Round 2!

Huge thanks to Tracktive for their on-site support. The car goes like stink and looks the bomb!!

I think I like my Impreza again!



Also thanks to ScoobySprint for providing an excellent Sprint Championship.

If you want to know more about ScoobySprint, go to Scooby Sprint Championship

I can't wait for ScoobySprint Round 3 now, but before that happens I have something I need to attend to..... more on that in the next thread update.

Last edited by Shaun; 11 June 2009 at 08:34 AM.
Old 11 June 2009, 07:12 PM
  #53  
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Here is the official ScoobySprint video from Round 2, which shows a bit about the Tracktive Constructors Team!

YouTube - "This is Scooby Sprint" - Mid Season Action

Enjoy!
Old 11 June 2009, 08:10 PM
  #54  
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Shouldn't have posted that link, where's the TMIC?
Old 11 June 2009, 08:32 PM
  #55  
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ROFLOL - It's the latest Tracktive Product, still in testing!

That was down to me crapping myself when I had a camera shoved in my face...... I spouted all kinds of garbage! That was a terrifying experience.
Old 12 June 2009, 08:55 PM
  #56  
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Originally Posted by Shaun
I spouted all kinds of garbage! That was a terrifying experience.
Nowt new there then.

Looks like it goes well mate.
Old 15 June 2009, 01:38 PM
  #57  
Shaun
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MAY 2009 - The day after ScoobySprint - Something that needs attention!
OK..... so the car was back on the road after some extensive work. The car attended and ran at it's first event this year and was absolutely fantastic.

So what was next??

No point in having an awesome car, if it makes no difference with a muppet behind the wheel. Yes.... I am that muppet!!

People seem to center on how good a car is set-up, what tyres it has, what suspension set-up it has, how much power it has etc etc as the key areas for how quick a driver can be.

Whilst I can understand that all the above CAN make a car quicker, I would suggest that changing the above is secondary to being able to actually drive correctly in the first place and to understand the car and it's dynamics. This can then inturn inform what needs to be done with the car, as regards to mods.

I would say driver ability is the biggest advantage imo. Look at John Felstead in ScoobySprint Round 1! He came 6th OVERALL with a standard class spec car.

He has weight against him - Full weight Newage
He has tyres against him - normal road tyres
He has suspension against him - normal struts
He has brakes against him - normal brake set-up

The only positive he has over a factory standard Newage car is around +40bhp, but when you offset that against his ten ton weight it is irrelevant in my view.

So what is the biggest difference?......... his driving ability!

The biggest advantage and best value for money (imo) is to have some tuition. It has took me years to realise this. I have over 500bhp, but I bet I would not of been any slower at Round 2 if I was in a less powerful car. In fact when I turned the power up during Round 2 I was actually slower..... so I ran in low boost for 5 of the 6 runs.

I had already booked my driver tuition weeks before the ScoobySprint Round 2 event, and because I was unsure if I was able to have my car on the road I decided to take up the facility of using the tutors car.

The tutors name was Mike Cooper of DriverTuition.com and the full day was booked at Bedford Autodrome. The total cost for this one to one tuition, at an open pitlane day at Bedford was £815. That includes EVERYTHING and all I had to do was turn up.

After a previous discussion with Mike on the phone, he decided that I would get more benefit from driving the M3 out of his car fleet. As he suggested that I would get more feedback about what I would be doing incorrectly.

One of the things that Mike said to me, is that nearly all people will say they need better tyres and/or better suspension and/or more power to make them quicker.... when in fact a high percentage need to be a better driver to make them quicker.

This day was not about Mike telling me how to drive quick around Bedford. It was for me to know how to drive better wherever. Whether that be on the road or track.

Now..... don't think I am going to give you details of what he taught me. I had to pay for that.... so will you!!! But he absolutely RIPPED my driving apart. I was doing NOTHING right!

I must admit, I never thought I would get this excited about vehicle dynamics, but I think about it all the time now. I have completed a fair amount of theory reading since the tuition and I REALLY enjoy driving again (even in my every day car), as I am trying and learning things all the time now.

Whether all this knowledge will transfer to the sprint circuit when the red light changes to green is a different matter, but I certainly feel that I understand more and feel much more confident on the road, in that I now understand more about what the car is doing and how my inputs affect it.

The first step is admitting you have a problem.... the second step is to be shown the way forward.... the third step is to keep practicing and learning. Sounds like I have a drink problem.

I think looking at Round 1 and seeing what drivers like John achieved was the final push I needed to do something about it.

Whilst I am still in the early stages of the learning curve and still have stacks to do, the initial tuition I had has been a godsend. I would certainly recommend Mike Cooper and I will certainly be using his services again.
Old 15 June 2009, 06:25 PM
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stevebt
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Nothing wrong with admitting you can't drive as well as you hoped and doing driver training Lets hope this does you well on the scoobysprint series ?? I assume the sprint series would be harder than normal roads as its just a cone layout !
Old 15 June 2009, 07:49 PM
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Shaun
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JUNE 2009 - Final comparisons and getting ready for ScoobySprint Round 3
With a week to go before Round 3 of ScoobySprint, I thought I would have a comparison check made at Zen Performance, as regards to the "as now" power graphs.

You maybe asking why.

Because the Tracktive Dyno is a HUB based dyno, it does not calculate any type of Flywheel estimate. Don't get me wrong, I fully appreciate the benefit of Tracktives Hub set-up and fantastic dyno cell, but unfortunately the "pub" figures are normally based on flywheel calculations, so I thought it would be interesting to find out the comparison..... not that it really made any difference now.

As I had previously run at Zen (at the 2.5ltr ShootOut Day) with the previous engine, just before the headgaskets went, it was seen as a good idea to use that previous run as the benchmark.

Since I already had an approximate Tracktive hub to Zen flywheel estimation transmission loss (based on my previous Tracktive Hub Dyno and Zen Flywheel runs), I had figured where the "numbers" should be.

Now, unfortunately the day that the car ran was probably not the best.... ambient workshop temps recorded by the dyno were over 31degs. Whilst a dyno can compensate for atmospheric conditions for figures, it will not compensate the spool rate of the turbo due to cooler/dense air, neither will it compensate for ECU safety as regards to pulling ignition when charge temps go over specific levels (which my ECU is mapped for). Other dyno cells I have used (Tracktive, PowerStation and AET) can combat this to a degree, as these use purpose built cells with brilliant cooling (Tracktives cell has FIVE cooling/air flow fans and TWO heat exhaust fans). Unfortunately the dyno at Zen only has a single fan at the front. I know that they are looking to create a proper cell enclosure with better extraction etc, and I am sure this will certainly help.

So on with the dyno results!!

Since I have always had two boost settings (along with various fuel trims and ignition trims) at my disposal, via the centre console ECU control panel, I thought it would be good to complete some runs on low boost and high boost.

Low Boost first then.....

After a bit of playing around with the car on the rollers to get an accurate figure, the car made a whopping 485.1bhp / 440.4lbft. Apart from the lower than expected torque figure, please be aware this was at a peak boost of 1.5bar and held boost of 1.45bar. Pretty fantastic in reality, especially considering this was on VPower. Saying that though, it was within a nats "thing" of what I was expecting, based on my hub to flywheel estimations. So far so good.

For comparison, Tracktive recorded 415/432 at the hubs.

High Boost now then.....

I was expecting some good things from these runs and to a degree the flywheel power proved this. The dyno stated 518.9bhp / 503.4lbft, at a peak power boost of 1.8bar.

To be honest, I was expecting more based on my hub figures at high boost from Tracktive and comparing the graphs, it looks like the turbo was struggling on the Zen run. I suspect this was down to heat. On the Tracktive hub dyno it dropped off power at the top end on the High Boost run, yet it was still producing 40bhp more at 7k rpm over the low boost hub dyno run. On the run at Zen it was producing the same at 7k rpm on both High and Low boost. Since the low boost runs at Zen were the initial runs, the sweet spot for temp issues had probably just taken place..... the high boost runs may of pushed the temps a bit too much (ambient temps on the high boost run were 31.3degs, so I have no idea what the charge temps were).

For comparison, Tracktive recorded 486/512 at the hubs.

Anyway..... it made what it made and the Zen runs were another "stake in the ground" regardless.

I certainly know that Tracktive have never had a more powerful Subaru, using a standard fit GT30 turbo on VPower. Whilst I do not know for sure, I suspect it is the same with Zen (it certainly was the case 6 months back even when I had less power).



As the low boost graph shows.... it really does not need anymore than low boost for most scenario's. The peak power is at 7000rpm, and only just drops ever so slightly to 7500rpm. It has an awesome powerband for a GT30 type turbo.

The only thing left to do now was to prep the car for the third round of ScoobySprint.

Full details on how this Round goes in about a weeks time.

Last edited by Shaun; 15 June 2009 at 07:51 PM.
Old 15 June 2009, 08:04 PM
  #60  
mickywrx
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Good write up.

Them's damn good figures Shaun.


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