Injectors TOO big to idle? - Page 2 - Subaru WRX Forum
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#16 Old 08-17-2008, 02:16 AM
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Quote:
Originally Posted by azreal View Post
thanks.

the tuner says the orifice on a large injector is so large that even on a low duty cycle, it would flow too high making it hard to idle and give you flat spots when you get back on the gas.

re: turning down the fuel pressure, would that do the trick?
Then he's buying shitty injectors. There's plenty of 800cc and larger injectors on the market that what he's saying simply isn't true.

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Last edited by mosc; 08-22-2008 at 11:22 AM.
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#17 Old 08-17-2008, 09:51 AM
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Quote:
Originally Posted by azreal View Post
thanks.

the tuner says the orifice on a large injector is so large that even on a low duty cycle, it would flow too high making it hard to idle and give you flat spots when you get back on the gas.

re: turning down the fuel pressure, would that do the trick?
You don't fix this by adjusting fuel pressure.You fix this by adjusting injector latency and scaler. This thread show a guy who runs moddified stock injectors(835cc) on his stock turbo and how its done........Circumsized Stock Injector Fueling - Rock Steady Idle - Perfect Fuel Trims - FREE map - NASIOC

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#18 Old 08-22-2008, 11:00 AM
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WRX Fuel injector sizing guide STi Fuel injector sizing guide Lgt fuel injector sizing guide, JSC Speed

Found this chart just to maybe help sort things out a little.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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#19 Old 08-22-2008, 11:56 AM
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The problem is he is using a Utec.If he tuned the stock ECU programing he would have no problems.

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