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Old 03-13-2004, 11:21 PM   #1
Big Ron
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
on car parts so PM
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Default What bigger turbo will run on the stock ECU and the stock fuel system?

I have dominated the search feature here, but this question doesn't lend itself well to searching.

I would like to know any and all aftermarket turbos that can be considered plug and play with a WRX. That is a turbo that requires zero engine management, stock injectors, stock fuel pump.

So far all I have come up with is:

Stock Turbo
Ported and Polished Stock Turbo

Unless my memory is wrong, I think there is another turbo or two that you can safely run on the the stock ECU, injectors, and fuel pump. Am I wrong?

The only turbos I think will work are the VF-24 and VF-29? Has anyone run these or other turbos on a stock WRX? Mind you, exhaust or other mods are fine, I am just talking about stock ECU and fueling.

Links would help too! I am researching my next FAQ and this will be a part of it.
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Old 03-14-2004, 12:08 AM   #2
John Wayne Toilet Paper
Member#: 7327
Join Date: Jun 2001
Chapter/Region: NWIC
Location: Seattle, WA
2008 Mazdaspeed3
2006 Wrangler Sport


The VF-35 worked for me on stock ecu for a long time. I showed no mercy after some careful driving around and keeping the boost to about 15psi, I proceeded to flog the hell out of it and it never let me down, but it's much much better (and safer) with tuning and fuel to support it and now, instead of 220whp, I am getting upwards of 270whp.

I wouldn't make that info part of a faq though. It's never a good idea to tell somebody it's possible to do that. I only brought it up here because I recognize that you're responsible enough to handle that knowledge.
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Old 03-14-2004, 01:26 AM   #3
Big Ron
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
on car parts so PM
me b4 j00 buy


Don't be so sure.....I surprise myself sometimes with my lack of responsibility! Oh, I won't add it! I know there are many turbos that you can put on and baby on the stock system, but I would never recommend that someone do that. I just thought I remembered a turbo or two out there that were 100% safe to bolt without ECU/fuel upgrades. Maybe I'm wrong though.
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Old 03-14-2004, 08:54 AM   #4
Scooby Specialist
Member#: 3803
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: South Carolina
07 Mustang GT
285 is a wide tire!


Well, with a uppipe/turboback exhaust the stock turbo can max out the stock injectors below 6000 rpm. Add a shorty intake and port/polish of the throttle body and /or TGV's and it goes static even earlier. What the ECU can handle in terms of a little bigger turbo is very subjective; The injectors will go static sooner, and A/F ratios are going to climb. This all in the rpm range where the ECU apparently doesn't listen to the knock sensor.

nhluhr, what was the boost at redline with the VF-35 on the stock ECU?

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Old 03-14-2004, 05:47 PM   #5
Scooby Newbie
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Join Date: Dec 2003
Chapter/Region: NESIC
Location: WESTFORD MA.


I have been told by a Scoobie specialist, that you can run a VF24,or VF29, with stock injectors and pump, as long as you don't exceed 15 psi boost. I plan to do it. It is supposed to give you a good amount of low & mid-range torque.
I will have an EcuTek reflash done, on a dyno, just to tweek it.
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Old 09-19-2005, 12:13 AM   #6
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Join Date: May 2003
Chapter/Region: MAIC
Location: Reston VA
2001 SRP RSTi
2011 DGM WRX hatch


You should update this now that you know.

-- Dave
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Old 09-19-2005, 02:57 AM   #7
Scooby Specialist
Member#: 82391
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: Lou. ky
08 OBP Sti
td06SL2, 20g 299hp 300tq


Couple guys out this way are running total setups without Em for a while and im sure theres more theyve upgraded the fuel pump and injectors though.

Im planning on something in a 16g or 35?? forgot which 35'turbo next year. Ill have to see for myself if it wont run before EM.

wrx VF39 <sti
One guy even has a
wrx 16g

Hope this isnt to much info for anyone.
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Old 09-19-2005, 10:16 AM   #8
Scooby Specialist
Member#: 67608
Join Date: Aug 2004
Location: SoCal

Run Water Injection and leaner A/F ratio. If you max out your injectors on the stock turbo at saaaay 28 lbs/min, with a 12.5 A/F ratio instead of 10.8, you'll max out your injectors at 32 lbs/min ... which is VF-39/34/30 territory. Roughly speaking.

It's just risky and the hoard of nay-sayers will be alone shortly.

Also, alky injects fuel, so you can not only run leaner A/F ratios from the higher effective octane, but run less fuel in the injectors since you're running more from the alky injector(s).

Man this thread is old ...
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Old 09-19-2005, 11:44 AM   #9
Scooby Specialist
Member#: 10945
Join Date: Oct 2001
Chapter/Region: South East
Location: SC
2006 Evolution IX


i ran a vf22 on stock ecu/injectors/pump for about 2 or 3 weeks. I had a vacuum line from the turbo nipple to the wastegate actuator. It was making about 7-10 lbs. It varied depending on the temperature.
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