How does temperature affect boost?
Thread Starter
Melting Slicks
Joined: May 2005
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From: Las Vegas Nevada
St. Jude Donor '08
How does temperature affect boost?
For the last few months, under full throttle, my car shows 7-7.5psi at 6,500 rpm in the 70’s. Today it was in the 90’s and I saw 9 psi at 6,500 rpm. Is this the way it goes or is something wrong?
Thanks,
Clayton from Las Vegas
Thanks,
Clayton from Las Vegas
Racer
Joined: Apr 2007
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10 degrees (F) air charge temperature = 1% HP
Melting Slicks
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From: boston mass
Le Mans Master
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Melting Slicks
Joined: Apr 2005
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From: Chicagoland Area IL
Uhmm I would double check your facts… cold air is more dense then hot air and that is why centrifugal superchargers make more boost when its colder outside.
Mike
Mike
Last edited by Skunkworks; May 9, 2007 at 11:49 AM.
Melting Slicks
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From: Chicagoland Area IL
Mike
Le Mans Master
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Racer
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From: silverdale washington
I agree the colder air is more dense and therefore the boost should read higher. This is due to the compressing air inside your intake and heating it up therefore expanding and creating higher pressure. But would also depend on temp of the motor. Boost is only reading the resistance of flow essentially. So as engine temps increase and metal expands the clearances can get tighter and therefore can create more resistance to flow depending on condition of the engine. Not to mention that the tolerances in the actual supercharger will get tighter as temperature rises increasing the efficiency of the supercharger substantially. Just a guess. typically though assuming the supercharger and motor are both completely broke in and in good mechanical condition, you should see less boost as temps increase.
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Melting Slicks
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Melting Slicks
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From: eagle mountain utah
Sounds like your BOV may not be working right all the time. May be time to take it apart and replace the rubber diagram if thats what it has.
