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Old 03-01-2005, 04:03 PM   #1
Bayley
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Default WRX vs. STi fuel pump specs?

Does anybody have the specs on the 2004 STi and / or 2004 WRX fuel pump(s)?

I have an STi fuel pump laying on my desk and was wondering if the STi pump was any (if at all) different than the original 2.0L WRX fuel pump. I'm only planning on running 320 - 340 crank hp from my 2.0L, so the 255 gph Walboro is a little overkill right now.

Anyone?
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Old 03-02-2005, 03:49 AM   #2
JIM THEO
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Exactly, I am searching months now for the same but no one cares to comment!
Anyway I found that STI USDM MY04 fuel pump supply is 145l/h while WRX MY04 (all over the world) fuel pump is 130l/h.
Service manuals from both models confirm it.
I have a USDM STI fuel pump ready for fitting in my WRX04 as I am planing also to achieve about 300ps at the flywheel.
You can buy a Walbro 190l/h High Pressure that is between STI pump and Walbro 255l/h HP but Subaru calculates flow at 43,5psi pressure (300KPa) which means a 145l/h (STI pump) gives only 5l/h less than a Walbro 190HP while a Walbro 255l/h HP gives less than 210l/h!
Hope this helps you!
JIM
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Old 03-02-2005, 08:24 AM   #3
dimitriSTI
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hi jim, i thought that this was a "bigger is better" mod.
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Old 03-02-2005, 08:38 AM   #4
Bayley
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Thanks Jim,
Your information correlates with what I suspected.

Follow up question; at what PSI / KpA does Walbro test their pump flow at?
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Old 03-02-2005, 08:52 AM   #5
ride5000
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just put the walmart in. there really isn't any negative side to the larger capacity pump.

http://www.vfaq.com/pump-Walbros.html
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Old 03-02-2005, 05:14 PM   #6
JIM THEO
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You need FPR with much higher flow if your factory regulator/fuel pump controller can not return back the extra fuel the pump gives.
Isn't always the bigger is better modification and always needed at least remap or your car will overfuel badly!
I found a STI pump (USDM Dimitris and not EUDM, yours is same with mine = 130l/h) is fine for about 330-340ps.
I am not sure at what psi Walbro tests their pump flow but compared with Subaru "rate system" a Walbro 255HP gives exactly 207 l/h.
JIM
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Old 03-02-2005, 05:23 PM   #7
JIM THEO
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...from a chart I have the 255HP gives 68 gal/h (255l/h) at 20psi so it's obvious this is the pressure Walbro calculates their pump flow, quite low IMO!
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Old 03-02-2005, 06:47 PM   #8
ride5000
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Quote:
Isn't always the bigger is better modification and always needed at least remap or your car will overfuel badly!
jim, do you have some data to back this up?

folks have been fitting pumps to their cars for a while over here with no ill effects. i would expect there to be some reports of a fuel pump swap netting say -0.5afr. just so we're clear, i'm talking about swapping a properly working oem pump out for a walbro gss341/342.

ken
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Old 03-03-2005, 02:14 AM   #9
JIM THEO
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Without a remap you'll suffer badly overfuel, of course it doesn't mean you'll have ill effects except higher consumption and probably lower performance, ask any Ecutek mapper with wide band lamda sensor, he'll tell you!
JIM
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Old 04-03-2005, 11:05 PM   #10
BIGSKYWRX
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The v7 jdm fuel pump is rated at 180 lph
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Old 04-04-2005, 01:27 AM   #11
Rickyh
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Quote:
Originally Posted by JIM THEO
Without a remap you'll suffer badly overfuel, of course it doesn't mean you'll have ill effects except higher consumption and probably lower performance, ask any Ecutek mapper with wide band lamda sensor, he'll tell you!
JIM
I swapped in a walbro pump long ago with a stock fuel system and turbo and my wideband readings didn't change not one bit. Any extra fuel is just returned to the tank.
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Old 04-04-2005, 09:03 AM   #12
ride5000
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Quote:
Originally Posted by Rickyh
I swapped in a walbro pump long ago with a stock fuel system and turbo and my wideband readings didn't change not one bit. Any extra fuel is just returned to the tank.
did your fuel trims change?
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Old 04-04-2005, 10:26 AM   #13
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When I swapped a walmart pump in my afrs and trim didn't change. The factory pressure regulator took care of it all.
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