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Old 07-09-2004, 02:48 PM   #1
RafalW
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Question Reflash on STi and a fuel pump.

How important is a fuel pump upgrade at the time of reflash on an STi which only has a full TurboXS exhaust? What are your opinions?
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Old 07-09-2004, 04:40 PM   #2
Wombat North
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The STI fuel pump flows more than the injectors can flow. Until you up the injector size or fuel pressure your fine with the stock pump.
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Old 07-09-2004, 06:01 PM   #3
titsataki
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A Walbro pump is like less than $100 shipped (if you shop around).
IMHO cheap insurance for the future. I had one on my WRX for 2 years and worked like a charm. I am planning to transfer it into my STi soon.

Regards

Nick

PS: I have heard that the the upgraded pump on the STi increases the fuel pressure? Making the car run even richer? You may want to verify before you install the pump (before tuning/injectors/turbo). But on the other hand this might be just urban legend
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Old 07-10-2004, 01:22 PM   #4
RafalW
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Quote:
Originally posted by titsataki
PS: I have heard that the the upgraded pump on the STi increases the fuel pressure? Making the car run even richer? You may want to verify before you install the pump (before tuning/injectors/turbo). But on the other hand this might be just urban legend
This is the part I am interested in. I was told I need it to increase the pressure so injectors would not run 100% all the time. Is it possible that just a pump will do it or I need an extra some kind of fuel pressure regulator? It would be nice to have it higher for this purpose.
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Old 07-10-2004, 02:44 PM   #5
jagcars26
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Quote:
Originally posted by titsataki


PS: I have heard that the the upgraded pump on the STi increases the fuel pressure? Making the car run even richer? You may want to verify before you install the pump (before tuning/injectors/turbo). But on the other hand this might be just urban legend
Nick brings up a goood point and one I have heard before also,,,
Anybody got the answer?? Urban legend??

Rudy
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Old 07-10-2004, 06:44 PM   #6
Wombat North
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Quote:
Originally posted by Wombat North
The STI fuel pump flows more than the injectors can flow. Until you up the injector size or fuel pressure your fine with the stock pump.
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Old 07-10-2004, 08:52 PM   #7
RafalW
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Wombat,

What I need to do to rise a pressure and what it would do for me?
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