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Stupid question idle boost

 
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Old 12-01-2010, 05:37 PM
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Stupid question idle boost

Stupid question but..... Do turbo engines boost without a load on them. I know how turbos work ect but I can't understand why when it's out of gear and then reved it doesn't create boost, surely it's still pushing the same exhaust gases out so should still spin turbo do should still create boost. Please someone explain to me why, put my mind at ease,
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Old 01-21-2011, 02:41 AM
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Re: Stupid question idle boost

Im gonna set the baseline at aftermarket larger turbos. Ussually they spool and create boost around 3500 or so. But its building boost because the engine is under load because of the weight of the car and pushing enough exhaust gas out to start spinning the turbo fast enough to build boost. At idle the wheel spins slowly and freely, just enough to give the engine the air it needs to run. Its acually getting sucked in because of vaccuum. If u rev an engine high at idle u might be able to see a pound or 2 out of the turbo but not full boost.
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