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Stupid question idle boost

 
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Old 12-01-2010, 04:26 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 12-01-2010, 04:43 PM
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Re: Stupid question idle boost

Yes if your in neutral it should create boost pressure, but at idle there shouldn't be any pressure unless your turbo is small and I mean SMALL.
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Old 12-01-2010, 05:45 PM
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Re: Stupid question idle boost

Hmm ok why then when I rev does it not register on my boost gauge. It just fluctuates in vacuum rather than positive pressure. I don't think there is a boost leak or if there is then it's a small leak and would imagine it should still register some boost. I know turbo is spinning as I have no filter on yet so I can see it spinning. It's running on a pherable.net base map at the moment.
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Old 12-01-2010, 07:38 PM
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Re: Stupid question idle boost

just revving an engine up dose not move the same amount of air as the car pulling through a gear . you will never create the same boost revving up as you will pulling through a gear .. this is why true launch controle on turbo cars actually retards the timing so far it lights the fuel in the exhaust because you cant really build any boost free reving an engine up ( not enough volume ) .. think of an engine as an air pump because thats basically what it is . when you pull through a gear how much more air are you moving than just reving it up under very little load .. the volume of air moved under load is much greater ..
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Old 12-02-2010, 01:44 PM
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Re: Stupid question idle boost

You should probably get it tuned before you go too hard on it
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Old 12-02-2010, 01:59 PM
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Re: Stupid question idle boost

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Originally Posted by rburnham11 View Post
Hmm ok why then when I rev does it not register on my boost gauge. It just fluctuates in vacuum rather than positive pressure. I don't think there is a boost leak or if there is then it's a small leak and would imagine it should still register some boost. I know turbo is spinning as I have no filter on yet so I can see it spinning. It's running on a pherable.net base map at the moment.
I had a turbo auto eclipse and it did the same thing so I dont think its a problem i just think it just does that
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