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Old 04-28-2013, 08:11 PM   #1
BoomWrx
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Join Date: Jul 2012
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Location: Chicago, IL
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2007 WRX
BLEEEK with some sparkles

Default TD04 with 255 fuel pump?

Can the 255 fuel pump be used with the td04? I will be running a stage 2 cobb ots map.
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Old 04-28-2013, 08:26 PM   #2
Francois_
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Yes it'll work no problem. Do you plan on upgrading the turbo in the future?
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Old 04-28-2013, 08:37 PM   #3
the suicidal eggroll
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2012 WRX

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We run a return style fuel system. This means the FPR regulates the pressure, and any additional flow gets returned to the tank. This means that you can run any pump you want, so long as it meets three criteria:

1) It provides enough flow for your injectors
2) It doesn't provide so much flow that you start to get a pressure drop between injectors
3) It doesn't require so much current that it fries your fuel pump controller

None of these requirements have anything to do with what turbo you're running.
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Old 04-28-2013, 08:42 PM   #4
'08WRXRider
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^^the suicidal eggroll, next questions are:

What fuel pressure would cause pressure drop across injectors?

&

What current draw would "fry" our fuel pump controllers?

Thanks
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Old 04-28-2013, 08:45 PM   #5
BoomWrx
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Ahh right now I have a vf39, but will be going back to the td04. Just making sure I will be ok. I dont want to swap fuel pumps again. Thank you guys!
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Old 04-28-2013, 08:57 PM   #6
the suicidal eggroll
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Quote:
Originally Posted by '08WRXRider View Post
What fuel pressure would cause pressure drop across injectors?
You mean what fuel flow would cause an excessive pressure drop? Well it's more or less a squared relationship. Double flow, quadruple pressure drop. So there's always going to be some drop between the injectors (especially since we run a series setup), and it's up to the user to determine where that drop becomes significant. Personally, I would start to explore my options around 300 lph (actual flow into pressure, not rated flow into 43 psi). This could mean re-plumbing the rails in parallel, or running new lines/rails of a larger diameter.

Quote:
Originally Posted by '08WRXRider View Post
What current draw would "fry" our fuel pump controllers?
I'm not sure anybody has found out that limit. The voltage drop through the factory controller becomes prohibitively high before it actually blows, at which point people just re-wire the system with some relays or an aftermarket controller. This starts to become a problem around 15-20 amps. In other words, it can power most single pumps adequately, but dual pumps are pretty much out of the question.
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