yes or no?
#2
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No. Redlining while parked is just wasting gas as there is nothing that's making the wheels move. You need to redline or go WOT so that the engine can blow out the carbon buildup as there is (Forget the word) that takes it out.
#4
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If you are just trying to get rid of the carbon buildup. I dont see why you cant redline it in neutral. Except that it it very easy to over rev the car while in neutral than under load. Just make sure you dont over do it.
#5
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If you do it while driving the engine is under far more load. It will use more fuel and more air --> more combustion --> higher temperatures. I can't say exactly how much, but the EGT's (exit gas temperatures) from revving it in neutral are probably nowhere close as hot as doing so under actual full-throttle acceleration.