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Old 10-03-2007, 12:22 AM   #18
ZW99GT
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Join Date: Nov 2004
Vehicle: 1999 GT
Location: Tennessee
Posts: 7,763
Default RE: FOR ANYONE WITH THROTTLE BODY AND PLENUM QUESTONS

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ORIGINAL: eventer289


Quote:
ORIGINAL: NetChemica


Quote:
ORIGINAL: GTowner4life

I read a 75mm T/B will lean out your car up to 30% And because my car isa N/A wouldnt a 70mm T/B lean out the car less and still give you the same Throttle response? What about MPG?

Why would a bigger throttle body lean you out? Is there air sneaking in past the MAF sensor?
Because the motor is able to take in more air than it could with a stock th/plenum. If the computer is not tuned to compensate, the car injects the same amount of fuel as it does stock, but with increased airflow, which in turn causes the a/f ration to lean out.
Wow. That's so not true. The fuel injectors do not just spray the same armount all the time. It all has to do what comes in the MAF! It doesn't matter what goes on after that.
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