Fuel Cut - Subaru WRX Forum
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#1 Old 05-24-2008, 04:46 PM
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Fuel Cut

Ok, I already posted this over on NASIOC with no response, maybe somebody here can help me out.

Ok, so I could'nt wait any longer to install my vf39. I installed it today and flashed to vf39 stage 2. I am definitely boost spiking; I am hitting 18-19 PSI in 1st through 3rd gear for 1/2 a second than it goes down to 16 PSI. 4th gear does not spike; but when I get to 4k to 5k RPMs it fuel cuts. My first thought was boost creep, because I have a catless TBE. But looking at my boost gauge right before fuel cut, it is at 16.5 PSI...

I checked the restrictor pill while installing the turbo, it is .042, which is in specs with cobb. I really don't know if I am boost creeping or not, because the PSI at the point of fuel cut is within target parameters. The engine code is P0244 Turbocharger Wastegate Solenoid "A" Range/Performance
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#2 Old 05-25-2008, 05:57 PM
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you using an AP?

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#3 Old 05-26-2008, 03:37 AM
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Yes sir.
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#4 Old 05-26-2008, 02:36 PM
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give cobb a call.

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#5 Old 11-09-2008, 10:41 AM
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i looked at your list of mods and i see you have no fuel pump, injectors and when you get it tuned for that car they will increase the injector pulse which means no fuel cut off. if you have anymore questions call or text at 336-309-0720. i also have extra performance parts for sale
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#6 Old 11-09-2008, 01:14 PM
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You will need to upgrade the fuel pump so your not pushing the stock one but your injectors will be ok for a vf39 turbo.
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#7 Old 11-09-2008, 01:14 PM
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Originally Posted by armykilla101 View Post
i looked at your list of mods and i see you have no fuel pump, injectors and when you get it tuned for that car they will increase the injector pulse which means no fuel cut off.
That is a 100% false.Fuel cut is a parameter that is relative to boost pressure and has nothing to do with injector size or pulse width.Also the 06+ WRX's come with 565cc injectors,which are plenty for that turbo.

OP-Catless TBE on the 06+ WRX's will have boost creep/spiking problems.What "gauge" are you using?Also reading a gauge while driving not as accurate as datalogging.

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#8 Old 11-09-2008, 03:38 PM
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Quote:
Originally Posted by dumdum View Post
That is a 100% false.Fuel cut is a parameter that is relative to boost pressure and has nothing to do with injector size or pulse width.Also the 06+ WRX's come with 565cc injectors,which are plenty for that turbo.

OP-Catless TBE on the 06+ WRX's will have boost creep/spiking problems.What "gauge" are you using?Also reading a gauge while driving not as accurate as datalogging.
I hate to correct a senior member but the 06 WRX comes with 585cc injectors. Yeah, larger than the STi. The fuel pump is enough to handle the fuel demands of even the VF34 at 23psi. Sounds like overboost but shouldn't be at 16.5psi. Might want to get someone to take a look at the tune.

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#9 Old 11-09-2008, 05:31 PM
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Originally Posted by 03 CrazyTaxi View Post
I hate to correct a senior member but the 06 WRX comes with 585cc injectors.
Not sure where you got your info from but this is where I got mine:

06 WRX Injectors Flow Tested to 560cc with Sheet - NASIOC
Injector, Fuel Pump, and Fuel Rail FAQ: Read if you are thinking of upgrading! - NASIOC

And if you download Cobb's AccesTuner Calibration Guide and Worksheets it lists all injector sizes and latency values.06+ WRX is listed as 560cc

Also if you open up the stock 06 ROM the injector scaling is set to 550.67cc's.

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#10 Old 11-09-2008, 09:03 PM
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Quote:
Originally Posted by dumdum View Post
Not sure where you got your info from but this is where I got mine:

06 WRX Injectors Flow Tested to 560cc with Sheet - NASIOC
Injector, Fuel Pump, and Fuel Rail FAQ: Read if you are thinking of upgrading! - NASIOC

And if you download Cobb's AccesTuner Calibration Guide and Worksheets it lists all injector sizes and latency values.06+ WRX is listed as 560cc

Also if you open up the stock 06 ROM the injector scaling is set to 550.67cc's.
Daayum, that's why I will never correct dumdum; It's safer to assume that I am misinformed, haha.
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#11 Old 11-09-2008, 10:01 PM
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I think that list is wrong. It shows the JDM Pinks as being 550cc when they are flow tested to 565cc. And USDM 02-05 WRX injectors are 440cc. The flow chart you posted is just a red x to me.

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#12 Old 11-10-2008, 07:39 AM
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.042 pills size...? That doesnt sound right....but i could be wrong
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#13 Old 11-10-2008, 09:01 AM
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Quote:
Originally Posted by 03 CrazyTaxi View Post
I think that list is wrong. It shows the JDM Pinks as being 550cc when they are flow tested to 565cc. And USDM 02-05 WRX injectors are 440cc. The flow chart you posted is just a red x to me.
The set of pinks I had flow tested flowed 535cc's @ 43.5psi from witch hunter.Got any links to your info?Just curious to see where they got their #'s from.There are gonna be some variations obviusly depending on what pressure they were tested at.More contridicting info....

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Last edited by dumdum; 11-10-2008 at 10:34 AM.
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#14 Old 11-10-2008, 11:35 AM
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I'm an idiot. This teaches me not to believe the people that actually have 06 WRXs. Originally, I had read that the 06 had 585cc injectors. Well, I've been corrected. They are the 565cc injectors. Sorry about that.

Here's something that has confused me though.
Quote:
The standard 2002 WRX injector is specified as 380cc, whilst the STI part is 500cc flow rate.
Quote:
OEM 2002-2005 WRX 420 cc
JDM STi "pinks" 550 cc
OEM 2006-2008 WRX 560 cc
OEM 2007-2008 STI 560 cc
So one site states the 02 has 380cc, another shows it at 420cc but the ROM shows 440cc. And one site states the STi has 500cc, another shows 550cc, my ROM shows 565cc, and Dumdum flow tested them at 535cc. So what's the right numbers?

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#15 Old 11-10-2008, 12:48 PM
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The thought of injectors being accurately specified within 5% amuses me.

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