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ORIGINAL: eventer289
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ORIGINAL: NetChemica
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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?
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Why would a bigger throttle body lean you out? Is there air sneaking in past the MAF sensor?
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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.
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I just want to say that if this was true, whenever people drove their cars on Cold days, they would be pinging like crazy. The whole Point of the MAF is to measure the temp and speed of the air coming past- while the TB/Plenum increases the amount of air coming in, that air is still coming past the MAF wire, and the computer can make adjustments. As long as there is not a leak after the MAF, the computer will be constantly changing fuel rate to make sure it is safe.
Obviously there are limitations to the stock tune, but basic bolt ons are not that limitation- it will be able to handle the TB/Plenum saftely just like it can handle a CAI, which basically does the same exact thing a Plenum/TB does.