FWIW I have 370bhp running meth on the VF35 on my STi..

 

What are your mods? Good figure, was it difficult to achieve?

Graham

 

Good move IMO. Look forward to your results.

 

Harvey Smith Ported headers, and uppipe, H&S 3" Downpipe, with custom mated 3" all the way Blitz Nur Spec R. RCM Cone filter, with custom made heatshield and air feed.
RaceDynamix remap.

The only downfall of the setup is the compressor surge due to the massive air intake, so the wastegate duty is slightly lazy to prevent the surge. I think this could be prevented with a reducer somewhere in the inlet or similar.. but the VF35 is known to be surgey!

 

RR graph:



On another RR, a DynoDynamics one, it made just under 370bhp but the torque was above 365lb/ft.

 

Not sure I get the wheel to flywheel power conversion to be honest, but it looks good. Do you have a dyno dynamics graph?

So other than the mods state you have no other engine modifications, or porting on the turbo etc. Are you still on the TMIC?

Graham

 

All the mods stated are all the mods I have. Nothing done to the turbo, still on the STi TMIC. I would love to go water injection, but I think a VF48 is next on the cards!

The wheel power conversion is done with a coast down, it has two contact patches, and both rollers do the measuring, and are resisting, hence the artificially low WHP.

Don't have a copy to hand of the dynodynamics one..

 

Isn't the VF48 the turbo on the 2008-> STi Hatch ?

Good for around 400 IIRC.

 

Don't bother racking your brains over the MAHA wheel to flywheel conversion. MAHA's don't read transmission or wheel figures as you maybe used to. The important factor is that MAHA's give consistent Flywheel calculated figures against other makes of dyno's but consistently give lower torque figures. Since us in the UK normally use flywheel BHP as the "judge" it makes no great odd's in reality.

 

It's strange isn't it, I'm a wheel hp person to be honest, as that is measurable all day long. My road dyno uses it accurately, DD dynos use it in the same way etc etc. Find it much more useable than flywheel figures.

 

I'm long passed the stage of worrying about dyno figures! They are what they are. Coming from being the ScoobyNet "Dyno Queen" that takes alot to come to that reasoning nowadays.

I'd rather compare real world in-gear acceleration times now. Much more interesting for the real world.

 

As great at the dynos are, they all have their downfalls.

For me, a dyno is a comparison tool, and for that reason I will always go back to PS after mods to compare from the previous time.

FWIW when I dyno'd at 330bhp at PS I ran 13sec quarter miles with some weight reduction (back seats) then when it dyno'd at 373bhp, I ran 12.2sec quarter miles without any weight reduction, with nearly 10mph higher top speed. This for me really shows the difference in power, and the dyno just backs that up for me!

I eagerly await the results when switching to the STi TMIC, and then the results with the addition of water injection! Keep up the good work!

 

Sorry for going O/T

Scooby - Did you do any 1/4 mile times in standard trim when you 1st got the car to compare your mods?

 

So I thought I'd go out for a hoon tonight after our discussions about dynos and get some real world figures and on the road AIT readings.

Ambient temperature was 11c and I was able to start each run with an AIT of 20c so this was the dyno run result:




On a dyno run in 2nd I would see the AIT rise to around 28c max. So I had a go at doing some runs all the way up the gears. Starting at 20c again I would ultimately see 48-55c at the end of a run through the gears.

I then had a go at some 1/4 mile runs, as my road dyno allows me to collect this data:

1/4mile = 12.871s @ 110.94mph (Std WRX = 14.3 PPP = 13.7)

Speeds were:

0-60 = 4.305s (Std WRX = 5.5 PPP = 4.8) +22% improvement
0-100 = 10.603s (Std WRX = 15.9 PPP = 14.1) +33%

Passing speeds were:

30-50 = 1.873s (Std WRX = 2.4 PPP = 2) +22%
40-60 = 1.584s (Std WRX = 2.6 PPP = 2.3) +39%
50-70 = 2.404s (Std WRX = 3.5 PPP = 2.9) +32%
60-80 = 2.721s (Std WRX = 3.8 PPP = 3.2) +29%

Generally I'm very pleased with the results so far, i've never done a properly timed 1/4 mile and it is only running with budget tyres currently.

Graham

 

I'm afraid not, no. Sorry.

 

What an interesting thread, Nice to see you on here Kosta.

 

what a great read,
im looking at fitting the sti waterspray set up in my hawkeye wrx and if you could point me to a fitting guide that would be great,

 

We are fitting (fitted) water injection not water spray, the injection sprays a fine mist at high pressure into the inlet tract. Water spray just cools the outside of the intercooler. On my rally car we found the water spray (to the front mount) made no difference but the injection dropped temps by approx 30deg.

 

What pump are you using..... I remember sometime ago the Aquamist pumps were a tad unreliable.... not what you want.

Have things changed now?

 

It's an aquamist pump, I havn't had any problems since it's been on the rally car. This is only a trial on the WRX, we don't plan to run it all the time as it's not really a day to day option for most owners.

 

It will be good to hear of your findings.

 

WOW pretty much most things I have planned for my bug wrx so this the perfect read, just a couple of Qs
1 If you ran sti pinks instead of your 750s would start up and idle be better on the standard ECU? I understand what your saying about drivability but a simtek is way out of my( most peoples ) budget/plans. are 750s a bit excessive?

2 I was hoping to see the difference between oe ported "headers" and after market 1s inc wrapped and not, any plans for this?

Im only asking cos you guys are the experts and this is what I have in mind, (already have ported oe "headers" not wrapped fitted) and wasnt planning on changing them TBH.

BTW great job and I think a thanks from all us Snet members is in order lol

also on a side note EM are you mobile? Im fitting everything my self and dont fancy driving too far for a map ......

 

A very intersting thread.

I would be interested in what can be achieved when using 100% E85 since this is available in Europe.

 

Thanks for the positive feedback, the plan is to test the things that most owners do as they upgrade their cars, along with the odd 'alternative' as we dream them up.
Yes I would expect the STI injectors to idle better, Graham will have a better responce to this question but the reason for fitting the modified ones was to test/prove our own components whenever possible/practicle.
On the header front I believe Harvey is donating a set of His ported headers along with a matched up-pipe to test. I obviously don't want them to work better than my headers but we will show the results whatever happens.
I know that many owners see the Simtek as a big outlay, but it really does make a huge difference to every aspect of the performance.
Yes Graham is mobile and we are both based in North Wales (Flintshire) so not too far from you.
Andy

 

We would if we could get any, Morrisons don't stock it anymore.

 

Thanks for that, Il keep checking for updates....I feel like its my car! lol although mines gonna take a while longer than yours ( Im allowed 1 goodie a month)
getting the walbro nxt month

 

I've lost track of the to do list but given the arrival of Racing Logic coilovers a back-to-back with the BCs would be interesting given they sit in the same price bracket. Specifically it would be good to compare what comes in the box (top-mounts, lengthened adjusters for the rears etc) and what is extra and also how the standard spring ratings compare for both everyday and track use

 

Sorry about the lack of updates for a while, I've been crazy busy this week, what with my September special offer and getting various cars ready mapped for competition this weekend!

Anyhow I've done the aquamist test and a couple of other bits and will gather the data together early next week and post about it all.

Leeturbo, pinks would be ideal for this setup. I wanted to test the validity of modified injectors on the newage cars. I've already mapped a number of cars that have the earlier type side feed yellows which have been modified with very unimpressive results. So in short, 550 pinks are ideal and the original ECU would run and drive as standard on these injectors. It just doesn't cope as well with much bigger injectors. The Simtek change was purely on the basis of a back to back, with again very impressive results. Response considerably improved which was nothing to do with the injectors. So just a good all round test to do, but no need to go this route unless you start to reach the ECUs standard MAF/injector tune-ability limits etc.

We are going to do some more header tests. E85 and other mix's of fuel have their limitations on this sort of setup. However E85 is really a gasoline/meth mix anyway, but yes could be worth a try. I'm debating on whether to return it to v-power, or perhaps try different mixes of fuel. I think I would like to try the main brand fuels and even a 95 vs 99 to see what sort of power loss it actually is and how much ignition I loose, (I have a fair idea but obviously this thread is all about tangible results).

Keep watching for more info!

Graham

 

Can you go back to std ECU for these changes & tests, or if you like the simtek do both std and simtek ECU's?

thanks

 

I'll be doing a bit of both, but from the face of it, it won't matter which I will be using, as both will produce very similar results.

Graham