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why car boost when its cold but not when its hot

 
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Old 08 Dec 2005, 06:51 pm   #1 (permalink)
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Default why car boost when its cold but not when its hot

car boost and holds 16 psi when its cold engine, but even after driving in for 10 min it drops boost and cant hold any thing more than 0.5 bar

cheacked all lines and there are no leaks

some said it could be the fast idel?



any one had this problem
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Old 09 Dec 2005, 07:37 am   #2 (permalink)
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thermal expansion...exactly how cold is it? your waist gate may be actualy changing sizes on you. also cold causes eratic turbo behavior in some cases. look at your filter make sure your not colecting ice on it...also your intercooler...if its iced over it can mess things up.
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Old 09 Dec 2005, 07:02 pm   #3 (permalink)
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its all DENSITY... the reason u add innnercoolers and CAI is too make the air in ur enigne colder thus denser this more able to hold a throttle pull

when it gets hot the air becomes less dense and thas why ur boost drops
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