Injector question

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Aug 2, 2004 | 10:16 PM

excessive03

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Injector question

Can I run 740cc injectors with stock fuel pump, turbo, and ecu. The car has a TBE, uppie, intake and boost controler set at 16psi. I figured these mods have leaned out the a/f ratio and was hoping just the injectors would be a cheap short term fix for a few more hp. I heard that the stock ecu can some what learn to adapt to the larger injectors. Is this an ok idea or am I a moron?

Aug 2, 2004 | 10:44 PM

Speed Element

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Car Info: Evo X, 04 STI, 335i, Fit

From what I know, the flow output of the STI 565cc injectors is about the limit of what a stock ECU can handle, even w/ it's learning ability.

-Soren

Aug 3, 2004 | 09:28 PM

Uncle Scotty

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Quote:

Originally Posted by excessive03

NO, YES.

Aug 6, 2004 | 01:16 PM

samowrx

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Car Info: 2002 WRX Wagon

Quote:

Originally Posted by MPJ Performance

From what I know, the flow output of the STI 565cc injectors is about the limit of what a stock ECU can handle, even w/ it's learning ability.

-Soren

i have a set of sti injectors just waiting to be installed. so you're saying that i can install them and drive around with the stock ecu?

right now i'm stumped with getting the car to a tuner after the installation, but if i can drive then that would be perfect.

Aug 6, 2004 | 06:41 PM

mmboost

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Car Info: 2016 Acura RDX ... meh. Um, nice subwoofer?

I wouldn't. Ask "odyssey". He tried exactly that, IIRC, way back when and his car was none too happy. The Unofficial UTEC Guide sez:

Quote:

The ECU can only correct +-25% fueling to compensate for injectors. If you
install STi injectors without engine management you will see that the ECU will
max out both ST and LT trims at –25. The ECU is trying to remove loads of fuel
to compensate for the larger injectors.

If the ECU is pinned all the way to one extreme, I would take this to mean it actually cannot properly compensate... at best it means its just barely sufficient, and that's not good enough for me.

jason