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Old 02-12-2008, 11:34 PM   #1
subikid
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Default STi fuel pump

Hey all,

I had a friend with an STi that changed to a 255, and gave me his stock pump. Figured I'd try it out, since it's a bit better than our stock 2.5rs pumps, so I've been told.

I put it in today, really easy install. Obviously no power gains, but the car almost feels more smooth upon acceleration and quick punches of the gas. More responsive..? Hard to put to words. Also replaced my filter while I was in there. Maybe that had a lot to do with it..

So what exactly should I have been expecting? Am I just feeling things that aren't really there?

Insight please

Kevin
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Old 02-12-2008, 11:38 PM   #2
Tim Sanderson
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Old 02-12-2008, 11:56 PM   #3
subikid
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dangit i was afraid of that. so the pump would have NO positive effects?
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Old 02-13-2008, 12:23 AM   #4
skribblez32
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I don't think the fuel pump had any positive effects because our cars don't really need more fuel to combust (based on stock ECU). If you're car was a high horsepower application, then it might help with A/F ratios at the high end.

Atleast now you have the peace of mind that you have a clean fuel filter
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Old 02-13-2008, 12:31 AM   #5
formula91
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Quote:
Originally Posted by skribblez32 View Post
I don't think the fuel pump had any positive effects because our cars don't really need more fuel to combust (based on stock ECU). If you're car was a high horsepower application, then it might help with A/F ratios at the high end.

Atleast now you have the peace of mind that you have a clean fuel filter
It's not even that. If I remember, higher cams + higher RPMs, the ECU has trouble keeping power up over 7k RPMs because it can't supply enough air. The fuel has even less to do with it now.
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Old 02-13-2008, 12:48 AM   #6
subikid
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Quote:
Originally Posted by skribblez32 View Post
Atleast now you have the peace of mind that you have a clean fuel filter
At least I got something out of it!

So.. I'm going with EM soon, because I have heavy mods on the way. Looking to start a build. Got the light mods out of the way... (i/h/e, pulleys, tbs, suspension, etc). That's the real reason I kept the fuel pump. I will prob be goin up to Jax in the coming months to get a gooooood tune. So maybe this pump was the beginning of the supporting mods

Kevin
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Old 02-13-2008, 01:32 AM   #7
rougeben83
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The smoother running maybe from the new fuel filter. Kinda like changing the sparkplugs.

STi fuel pump is way more pump than you'll ever need, but hey at least now you know how to do it
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Old 02-13-2008, 08:53 AM   #8
legacy1907
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funny when sti guys swap out for walbro since theres basically no gain
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