So maybe slightly OFF topic, which is better? mapping on a RR or on the road???

Steve

 

Steve,

In my opinion the RR is a very good tool for mapping a car as there are some things that are easier to do, not to mention safer on the RR. High speed mapping for example.

However, the dyno is a tool, and only a tool. There is not replacemnet for mapping out on the road. The main advantage of the RR is acurate repeatability when tuning.

The road is where the car is used at the end of the day and road mapping is by far the finer tuning media to use.

 

So in reality the answer is a bit of BOTH

 

Yeah ideally, the car would be base mapped on the rollers (purely for convenience) and then fine tuned on the road

 

Which incidently is exactly what used to happen years ago, jet the carbs, dial in the cams, tweak the ignition all on the rollers, then road test and final jet adjustments.

Anyone else remember profiling an SU needle?

 

Ok, i'll stop worrying about the next time I have Tiny and Rob in the car, whilst blatting up a hill!

 

 

Ive done SUs in a Jag V12 before but not on my own. I have however setup a pair of Riva Mikuni Powerbomb 48mms on my own before

 

PMSL

 

Can't see the steering servo, or the battery pack?

 

I've got a pair of 1.75 SU carbs on the roadster if you fancy balancing those up

 

Thats because i managed to extract 105bhp from a 785cc 2 cylinder NA 2 stroke. It lives in here..



Before anyone mentions it, yes this is PPG 057 Arancio california mica (Lamborghini orange)

Looks great on my ski thats small, carbon, graphic'd and used for freestyle.
Looks sh1te on a focus

 

i knew exactly were it was from mate.

By the way how do you know it made 105bhp, did you put it on the rollers?

 

 

No it was setup and then put on an engine dyno at Jetshed. A good friend of mine and championship engine builder/tuner Alan Pickard did the final adjustments

Jet Shed - Home

 

Nice result Sy Its good to get a figure on it at last, not bad for a true road car thats had a few years use !

I can assure you the smoke was not from the fuel, it will sting your eyes but it is not visible. Mapping to run 10% Methanol actually makes them run cleaner than running on V power. It must have been the tyres making the smoke, you may have pipped the 600 if you had the traction
Some other interesting results though

Andy

 

Hi Andy

Its was quite smokey and it was stinging mine and a few other eyes, but the smoke might have been general exhaust fumes and a bit of oil - its burning about a litre every 300 mile. Also - aparently their roller bearings went the following day - and it did seam more noisey running down after my run. The tryes were R888 at 30 psi, so not sure what the smoke was out of the combination above (or all of them!) - certaninly more smoke than the previous runs.

The AVCR was not set up properly - was running 50% DC across the board -
so happy with 570 but tailed off at top end. Peak power was at 5600.

Changed some settings this weekend with AlanG at the Pod - (put in the original 5 speed settings - with apropriate gear judge changes) pulls stronger and sweeter at top end now - may put on the rollers this weekend and see what it makes with the new settings.

Whats the efffect of tyre pressures on the RR results and what gear should it be in?



Sleeper


PS - no great times at pod - but 137 terminal.

 

A 137mph terminal is not to be sniffed at Si

What was the previous DC?

 

Hi Frayz - yes the ternminals are suggesting potential for quicker times - if I knew how to drive.

60fts were 2.0 s but ive done 1.6s before, so was running 11.04. I dont think im butal enough on the line - as others are breaking drive shafts - and im not. Very busy so only 3 runs.


I changed gearboxes some time ago, and never really re set up the AVCR correctly - I just set it at 2.0bar, 50% DC across the rev range (Hoping the self learn would adjust it) - this weekend i referred to the previous settings set up when it was on PPG.

On the previous set up - DC was high intially - to get it spooling, then lower at 4000- 4500 I assume to stop over boost at peak torque then higher again at the top end as the turbos running out of puff. (Im guessing here)


Sleeper

 

A 137 terminal should be getting you in the 10s id of thought

What boost is it running in gears? Im right in thinking its a 35/42R?.

 

Yes - have run a 10.9 - but the terminals suggest 10.5 ive been told - its running 2.0 bar comming in at 3.5 k and holdiing to 7k, the current avcr settings it looks to be doing this in each gear - but as im only in each gear for less than a few seconds its hard to monitor.


Its a GT35R standard - not 42R.

Not sure what SuperCues question or input is.

Sleeper.

 

The oil usage on 2.5's tends to vary. With your engine being a "built" engine, your piston clearances are considerably greater than a std 2.5, which means that for normal driving, you should see oil being "used". When the car is being run at full pelt, those clearances are taken up as the pistons expand with heat, so oil usage diminishes.
When I've been driving behind you or watching the car run on the dragstrip, i've never seen any oil smoke, so i don't think it will have been exhaust smoke on the dyno. Also, the catchtank which is fed by both the crankcase and the heads, doesn't have any oil of consequence, bar any oil mist mixed with condensate which is normal for any engine.
FWIW, the std 2.5 runs with very tight tolerances, somewhere in the region of 1/2 thou, so maybe this clearance is Subaru's way of controlling oil usage to acceptable "between service" limits.
As a side note, RX-8's have 1 litre oil packs as std, as they have to be topped up between services and is recommended to check the oil level every time you fill up with fuel, i'm led to believe! Stuff that!

I'm sure Andy will come back on this one, but if i can say that with the 6 speed box, i think it would be better to run the car in 4th gear rather than the 3rd. I believe EA's dyno uses rollers which aren't knurled, so with your car running a low gear and having a spool up which rises very sharply to full boost, there is the possibility that you didn't have enough traction on the day and hence slippage on the rollers coupled with not seeing full boost due to short run time.
In the past at Star Performance dyno, who also use smooth rollers, i used belt dressing on the rollers to try and maintain grip. Might be worth getting some, it's made by Rocol and is used in the packaging/manufacturing industry. Running a higher than normal tyre pressure on the dyno also reduces tyre flex, especially with the higher powered cars.

 

From standing behind the car on the first run the black smoke was definitely from the exhaust, perhaps the lower boost regions of the map are a little rich.

 

It may have been rich. At a previous 1/4 mile event, the fuel pressure was increased for that event, so not sure if it had been turned back down before the dyno day.
Certainly, if it's black, then it's fuel and not oil.

 

Hope to get the video soon..............

Maybe this will help.

sleeper

 

Quality wasn't good enough Sy, but can send you it if you want. Couldn't even see the timing board at the end of the run.

{Forget that, just realised you were talking about the dyno run}

 

Youve been eating too many tins of tuna.

 

When d'you expect to get the vid?

 

I have nearly completed the Dyno day DVD, but need SleeperSy to get back to me asap.... Check your text

 

Have you been in touch with Total Impreza mate?