Ok very very hot day yesterday. 31 degrees ambient and still managed to get some decent results

376 BHP with 350 FT/LB @ 1.56Bar (don’t know why 1.7Bar was written on the graph)

313.6 BHP with 290 ft/lb @ Wheels

Graphs Power/Torque Flywheel:
http://img16.imageshack.us/img16/6807/turbojfly.jpg

Power/Torque Wheels:
http://img136.imageshack.us/img136/5634/turbojwheels.jpg

Boost vs AFR:
http://img136.imageshack.us/img136/5210/boostvsafr.jpg

This dyno is very conservative but I will take it up to PT just to see any difference within dynos since my last four dynos have been there. Anyhow I am very happy with the results and it really does pull on the road. I was getting air temps at 72degrees all day and it weren’t knocking . Theoretically every 5degees will give 1% power so on a colder day where intakes are a more sensible 35degress I should see over 400BHP not to mention how hot the fuel was. It was so hot the exhaust melted the handbrake cable shut . It will need a little tweeking in the colder months as I should be able to run more boost like 1.8Bar and a bit more advance. I’m not quite 400BHP on paper but I’m sure I can break this barrier soon not bad for a GT2871R @ 0.64 ey

Spec is:
Fully Balanced
Forged Rods
Forged Pistons
Very Light Headwork
Standard Cams
GT2871R 0.64
H&S Downpipe
3" System
630cc @ 3.8Bar
Walbro Fuel Pump
FMIC
SIP with RamAir
Paddle Clutch
325mm Brembos
OMEX 710 ECU

Dyno Vids:
http://img190.imageshack.us/i/bravo.mp4/
http://img190.imageshack.us/i/bravo2.mp4/

Some flameage
http://img190.imageshack.us/i/bravo3.mp4/

They are silly temperatures to be having power runs like you said. Will be good to see what it makes on a cooler day!

What CR are you running these days J?

Can't view graphs at work but will have a look later.

9.4:1 but the strange thing is we were able to run more advance in my engine than squids who runs 9:1CR including the higher air temp I had . (It might have been down to oil vapours in Squids intake) . I have no idea why but my engine is responding really well to advance & boost increase. With some tweeking I recon I can hit MBT on a colder day. I put the map from Squids car onto mine to drive it to the dyno and on the way I had to pull out loads of fuel. His car runs about 11.5 on boost but with his map on mine it was running under 10:1.

Some good results there Jason So what stopped you running more boost given you are a 2bar afficianado most of the time?! I also assume this means you have managed to curtail your boost creep somewhat too, as it tails off to 1.3bar on the graph whereas before you said it was creeping to 1.7bar by the redline.

The temps certainly don't do turbo cars any favours, Westcoupe ran his 418bhp at 32 degrees ambient the other day! Where are you measuring the inlet temps, surely not after the intercooler as they should be much closer to ambient if it is efficient? Obviously the closer you get to the inlet manifold the more temps will increase. Interesting that you are making slightly less wheel power than on your old setup but more flywheel power. What makes you think the dyno is conservative?

Good luck tomorrow at the pod, it'll be a hard task nudging the 12s but a good launch should see you close

The reason why I could not go higher on the boost is because it was just generating more heat, 1.8Bar was managed to cram in with 94% duty but there was no real gain here, so on a colder day it might even be 2Bar due to the air density as on the last map I was getting 1.9bar from 90% duty. Squid was able to run 2.1Bar ages ago when the weather was colder. It was so hot yesterday.

Yes your right the boost creep has been cured too

As for the dyno, he says alot of people don't like his dyno as it speak the "truth". He says people rush of the other dynos to get their "pub printouts". I am only going to PT because that’s the only way I can compare my figures from before to see improvements but to be fair my car should be anywhere between 350-420BHP. One of the first runs we did made 325WBHP so as you quite rightly said the heat doesn’t do turbo cars any favours.

I doubt I will get a smashing time at the pod 2morrow because I’m still running roads tyres but I will do my best

Good results Jason

I'd like to see what would be the power on a colder day.

So if you are going to PT for another power run, will you choose a hot day to compre the dynos?

If only the weather in england was that predictable

PT have there dyno in a closed room as oppose to out in the open. I would like to dyno it when the air temp is about 18C as my other runs were about this temp.

turbo j i see you made less WBHP this time? but you made more bhp and torque but on your sig you.ve failed to alter your WBHP to what its currently running and not what it once was running

good figures tho

no i haven't.

On PT dyno it made 352BHP and 322WBP with 340FT/LB

On TD dyno it made 376BHP and 314WBP with 350FT/LB

2WBHP typo from 316 to 314. Hardley blagging my figures as the graph shows the proof

yeah i know

Maybe now as your figures show that WBHP is not the be all and end all. . . . . "you always go by the wheel power" as soo many people like to say

WBHP is clearly not by any means what you should always go by. although your car is technically faster now going by the WBHP like people rave on about your car would statiscally be slower by a tiny bit now

altho . . . .. you know its definatly a bt quicker

Don't know if it's quicker than last time i haven't really changed anything. Always go by the wheel figures, it might actually be slower as i didn't run as much boost or advance due to the high ambient.

Theres no way you can always go by Wbhp, i think it depends on the kind of rolling road you go on!
Last year i got 240 at the wheels on SINGLE roller dyno, Yet only 180 something on powerstation twin rollers!!

I'd say go by wheel figures if you go on a single roller as this better reflects "on the road power"...
And go by fly power on the likes on powerstation rollers!

Nick

This has been over & over. Chassis dynos measures power at the wheels. So that is what you have to go by. Dynos will vary at the flywheel estimation because it is an estimation but the wheel figures shouldn't be off by much between dynos. When comparing chassis dynos you should go by wheel figures. It makes no difference whether it be single, twin of hub dyno providing you have traction they should be the same at the wheels.

So there was a 60-70 bhp difference in the the wheel figures yet only 2 or 3 bhp difference in the fly wheel figures????
Some body needs to put this dyno argument to bed! lol!

Nick