Mods that i need when upgrading turbo - Page 3 - Subaru WRX Forum
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post #31 of 33 Old 11-16-2008, 04:55 PM
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Originally Posted by newtothegame View Post
I totally agree with Mosc about the injectors. They will be the limiting factor when tuning that car.
WRX Fuel injector sizing guide STi Fuel injector sizing guide Lgt fuel injector sizing guide, JSC Speed
That link even suggests at least 800cc injectoers, just backing up some claims.
Thanks good post. that helped me out to
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post #32 of 33 Old 11-16-2008, 05:43 PM
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Originally Posted by mosc View Post
Too big an injector means you're wasting fuel at idle/casual driving and if it's too big for the motor (probably in the 1000cc+ range for the EJ205), you're dumping so much fuel in there at minimum that it can cause rough idle.

Basically you don't want to just throw huge things in there for no reason because it will hurt your fuel economy. The minimum is raised as well as the maximum. There are some long term implications to running rich all the time but that should be kept mostly in check by a good tune.
If I put 800cc injectors in on my stock turbo and tune for them,how will they act any different than my stock 420cc injectors?They won't. Regardless of what turbo and injectors you use,as long as you are tuned for both properly,no problems with idle or AFR's will exhist.Using Opensource and Street Tuner it is as easy as just changing the injector scaler to the size of your injectors and maybe adjusting the latency values slightly and that is it.Better to have slighlty larger injectors than smaller but buying 1000cc injectors for a 18G is a waste of money.

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post #33 of 33 Old 11-16-2008, 10:49 PM
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Hey PB, not a problem. Glad I could help, thats what we are all here for.

"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX"
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