Paul TVR

I've looked at a few posts on here stating that the greddy kit running 15 - 16 psi should get to close to 200whp.

I dyno'd my car on friday, it's tuned nicely, decent AFR's and a nice flat afr range, but the car struggled to make any more than 177HP at the rear wheels, I had a different head on the engine previously and the car was around 200WHP, wondering what could be the cause for losing 20bhp?

The car has a fully mapable standalone emerald ECU with 440cc injectors, dual feed fuel rail, decent fuel pump etc.

I'm thinking I should check the cam timing as it maybe a tooth out?

Braineack

iTrader: (62)

what type of dyno.

at 16psi, holding to redline, on a good tune, id expect closer to >240rwhp.

kotomile

iTrader: (24)

Something has to be seriously amiss.

At 14 psi I did 247 (dynapack, no correction) and we pulled a bit of timing for a final of 240/217 at the hubs.

Pics of setup?

hornetball

iTrader: (4)

What's your exhaust system like? Plugged cat?

nitrodann

Ive never been in an greddy with the original greddy turbo that felt anything like 247 hp.

Dann

Paul TVR

Its on a dyno dynamics based in the uk, I know they can be a little conservative though.

TurboTim

iTrader: (9)

What are the dip switch settings on your Bipes?

Paul TVR

No bipes, it's running standalone ecu that controls ignition and injection.

Braineack

iTrader: (62)

did you log the dyno run?

what type of dyno?

what size exhaust?

18psi

iTrader: (76)

how about you share all the info so that 100 initial posts aren't asking you for specifics?

dyno dynamics can read very similar, and in some cases even lower than a mustang dyno.

TurboTim

iTrader: (9)

Oh well there ya go. Greddy kit only works well with Bipes, Starion IC (with Jim bobowski/15psi.com's intercooler pipe kit), Saab throttle body elbow, and a Bailey BOV from Roadster Performance. B.Bowser heat shield keeps the intake temps down! Racing Mazda's downpipe would be a good idea.

hornetball

iTrader: (4)

Darn, I've been doing it all wrong!

Paul TVR

Can't see how a bipes would be better than a decent fully mapable ecu?

The car has a large front mount which reduced air temps drastically, the exhaust maybe is a little small, 2.5" with twin pipes at the rear.

Unfortunately I didn't get a print out of the final run on the rollers, will try and get a print out when I'm next down there.

The car made over 200whp but since then had a replacement cylinder head due to valve guides being worn and the car smoking.

The turbo was a standard greddy unit but has a water cooled subaru core, with the greddy housings.

matthewdesigns

iTrader: (8)

If the only thing that changed is the head then looking at timing (base timing at the cam sensor) and timing belt/cam alignment is the first thing I'd recheck. I put down 262/239 at 17psi tapering to 15 on a Dynojet. The local DynoDynamics reads about 12% lower than the Dynojet I used, but even then it's still 230/210 and way above your numbers.

Next time you are in Colorado drop by

kotomile

iTrader: (24)

Neither have I, we pulled out 7 hp worth of timing.

Braineack

iTrader: (62)

I'm about to close this thread.

Paul TVR

Whys that?

Checked the cam timing today and looks to be fine, will try and get a printout of the dyno graph next week and post it up.

Braineack

iTrader: (62)

cause you answered one of 3 questions.

Fireindc

iTrader: (13)

Yeap, doesn't exist

Paul TVR

Sorry, I did say I didn't have a dyno plot, also said it was a dyno dynamics earlier in the thread and gave the exhaust size. But feel free to close it if need be. Thanks for the helpful suggestions.