I have a 97 JAP STI with the following mods:
STI8 bottom end
TD05
Apexi PFC
Full 3" Decat
4 Maps 0.9, 1.1, 1.25 & 1.4 bar.

At 1.4 bar I made 310bhp and 280 lb ft

I thought I would make more than that that so i was just wondering where the limiting factor is likely to be. All mapped on the RR so fuelling with optimax + booster etc spot on. I was thinking maybe headers but any advice appreciated.

Cheers, Paul.

 

My MY97WRX made similar power on a VF22, the standard 440cc injectors were maxed out though at standadr fuel pressure. I'd guess thats your problem too.

 

Paul,

Ported headers should help.
Larger than standard IC or go front mount
Larger injectors
Walbro fuel pump
Pressure reg.

I think if all yours are standard then these could be the reasons.

 

Definately intercooler, if youre running std go bigger but bear in mind that your car will always make more power on the road sue to the massive airflow that goes through the IC, rolling road setups just cant replicate this.

 

i think headers would help, mine is a 95 wrx running 303bhp/325ftlbs on standard IC,standard injectors and standard fuel pump, mods are full magnex decat,megan headers,scooby ecu chip cheers mark

 

I dont think headers will effect top end too much IMO, but definately mid-range torque.

 

I may be wrong but the sti top mount will not be restrictive with those sort of figures.

 

will on teh rollers mate, no airflow.

 

Who mapped it? What does your mapper think? He/she would be best placed to advise you.

 

I suspect the car would go bang if there was no airflow on the rollers.

 

lol, ok mate tell you what next time you go to a rolling road put your hand in front of the fan, then put your hand out of the window at 7k rpm in 4th on the road, and you'll see what i mean.

Trust me i work in engine testing, rolling roads are ok as an indication, but they arent a true representation of real-world driving conditions, hence why many mappers prefer to map on the road.

 

But, no airflow? Really?

 

Thanks, for the replies. Already have an uprated fuel pump. Would i need a fuel pressure regulator at this level of tune. Think it will be:

1. Intercooler
2. Headers
3. Injectors

Just have to get the pennies together.

Paul.

 

Just an aside to BOB'5 comment.
Has anyone ever met a female mapper ???

 

My 2.5 was producing around 320/320 before i changed the tek3 to an apexi. The only mods at the time were a full decat and vf23 turbo. Running at a conservative 1.2 with 1.3 overboost. I would have thought you would achieve more with the td05. Your mapper should be able to tell you though if the fueling/air flow is restrictive and advise accordingly.

Trems - if i were at 7k in 4th i'd be reaching for the gearshift, not the window switch...

 

Not yet......but some of the mappers do look quite....erm......odd

 

port the standard headers, fit bigger injectors, fit a FPR and up the fuel pressure.

why did you think you would make more than that?

 

BOB'5 >




I work with a female calibration engineer (which is fundementally 'mapping'), but we do O.E stuff not aftermarket if that makes a difference.