Assuming a target of 260kW with a bosch 910 pump on a 2.5. Stockies will do the job? Seems like its pushing the stock injectors a touch too far.

According to his profile... Hes got a 99 WRX right? Which means. You cannot de-cap the injectors. 99 WRX has side feed injectors. And while they can be high flowed, they cannot be decapped.

As for parallel fuel rails. stock GC8 rails can sometimes have fueling problems on cylinder 2 at high IDCs IIRC . Its easy to modify them to parallel setup.

Cheers All

Joe: Thats the formula I was looking for Guiseppe thanks. :)

Stace: FPR...Parallels....Sigh... Hot 4's :rolleyes: alright. I thought this was discussed ad infinitum in your FPR thread!!!

Foxey: Yes VF36, Built EJ207 + JDM worked heads with Spec C cams. :)


Just to clarify at moment I have MY99 Manifold +560cc STi side feeds, but can get 02 STi manifold with 816cc decaps.
If current 560cc system is enough then I will stick with that.

Is there any improvement with the MY02 STi manifold over the MY99 one ?

Not chasing big big KW but want to talk the Torque. ;)

J

[QUOTE=Mister Two]As for parallel fuel rails. stock GC8 rails can sometimes have fueling problems on cylinder 2 at high IDCs IIRC . Its easy to modify them to parallel setup.[/QUOTE]

MOTEC M800 = Individual cylinder trim on #2

[QUOTE=Mister Two]According to his profile... Hes got a 99 WRX right? Which means. You cannot de-cap the injectors. 99 WRX has side feed injectors. And while they can be high flowed, they cannot be decapped..[/QUOTE]

true, although i though he had a modern manifold.

[QUOTE=Mister Two]As for parallel fuel rails. stock GC8 rails can sometimes have fueling problems on cylinder 2 at high IDCs IIRC . Its easy to modify them to parallel setup.[/QUOTE]

not the case, this is due to the vacuum line on the fuel pressure regulator. move the vacuum line to the centre of the manifold and the FPR will have a correct pressure feed.

[QUOTE=WRXTASY]MOTEC M800 = Individual cylinder trim on #2[/QUOTE]
unless your logging cylinder EGT, i would suggest not doing this :)

[QUOTE=WRXTASY]Just to clarify at moment I have MY99 Manifold +560cc STi side feeds, but can get 02 STi manifold with 816cc decaps.
If current 560cc system is enough then I will stick with that.

Is there any improvement with the MY02 STi manifold over the MY99 one ?

Not chasing big big KW but want to talk the Torque.[/QUOTE]

i found 550's maxed out around 220kw with safety margins, (wideband lambda closed loop)

you'll want 816's for the boost, big torque needs it. at around 350hp i still only acheived around 65% duty.

the GD style manifold is better flowing then the GC manifold, i'll have definitative figures for it soon (if your really interested)

I have 700 cc side feeds with standard rails just bigger custom fuel lines with parallel setup to the Sard FPR. The sard lets u squeeze a bit more pressure out of the system if your injectors get marginal at higher hp levels.

Thanks Stace.....

Just plugged some figures into Guiseppe's calculator...

320bhp (240 KW) at 90% IDC = 560 cc/min, and that would only be at the crank.....

400bhp (300 KW) at the crank is about 240 KW at the wheels so yes its a GD manifold with the 816cc decaps.

Good discussion....

i tend to run IDC's up to 95%, beyond that i let wideband make the corrections for lean/rich to smooth it out.

im unsure what plans you have for your setup, but i assume you dont want to be doing it twice, pm me if need be.

cheers!

IDC's on my 440's were at 99% for ages without an explosion.

18 litres per minute.... you cant tip it down the drain that fasT!