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Old 06-16-2003, 03:18 PM   #1
rupert
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Member#: 19373
Join Date: May 2002
Question Enough fuel for 19.6psi on VF35?

I am running an Ecutek re-mapped ECU with Australian Spec. STi MY02 Engine, VF35 turbo, 500cc injectors, 355bhp fuel pump and catless exhaust system.

My boost is 19.6psi from 3300rpm dropping till 18.13 psi at 6000rpm then dropping till 15.95psi at 7000rpm. My IDC is <90% throughout, but I am still not 100% sure if I am getting sufficient fuel for safety.

Anyone running a VF30/35 at these boost levels- what fuel system are you using?

I will be installing and EGT sensor soon to make sure EGT's stay down. What should they be on a WRX?
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Old 06-16-2003, 05:49 PM   #2
Matty
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Join Date: Dec 2001
Location: Hood River ..Oregon
Vehicle:
2008 LGT
black

Default You should be fine

with that fuel pump and those injectors..with proper tuning you should be well within safety levels...There are plenty of guys close to that psi with a VF30 that are only upgrading thier fuel pump and staying within safe levels...But you do whats right for your car !!!
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Old 06-17-2003, 02:36 AM   #3
rupert
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Default Thanks mate!

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Old 06-17-2003, 10:21 AM   #4
RiftsWRX
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Location: Glendale Hts, IL, USA
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2000 NFR AP1 S2000
'07 Honda FIT sport (5MT)

Default

what I've found is that it's not so much the PSI you run, as the air flow being produced. Anything over 4.3 volts on the MAF (which is about 18 PSI on the SR40 will peg the injectors at 100% on a 10.9:1 AFR.

So, I try and stay just a bit under 18 PSI on 93oct. Right at 4.25 volts, 97% IDC.

By comparison.. I was running the VF34 at 19 PSI and running low 90% IDC's at 4.1 volts.

I'm learning more and more about this car as the years go by hehe.

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 06-17-2003, 11:46 AM   #5
rupert
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Default IDC calculations

Jorge,

How are you working out your IDC? I use the equation mS X rpm/1200. Which never gets me over 90%IDC according to the DD logs.

My voltage is above 4.1 from 4300rpm peaking at 4.5 at 6000rpm and holding this until 7500rpm in a 4th gear run.

Is this bad???
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Old 06-17-2003, 12:04 PM   #6
RiftsWRX
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2000 NFR AP1 S2000
'07 Honda FIT sport (5MT)

Default Re: IDC calculations

Quote:
Originally posted by rupert
Jorge,

How are you working out your IDC? I use the equation mS X rpm/1200. Which never gets me over 90%IDC according to the DD logs.

My voltage is above 4.1 from 4300rpm peaking at 4.5 at 6000rpm and holding this until 7500rpm in a 4th gear run.

Is this bad???
4.5 volts at what AFR (assuming it's an intercepter to control fueling). Or is it TRUE unmodified MAF voltage?

But fueling is calc'd by my UTEC.

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 06-17-2003, 12:15 PM   #7
rupert
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Default AFR

The standard STi ECU has been re-flashed, no-interceptor. So I presume it is the true reading.

Airflow is 250+ grams/sec above 6000rpm according to the cars own ECU.

Last edited by rupert; 06-17-2003 at 12:26 PM.
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