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Colder air is denser. Not only does the intercooler not to have to work as hard, the intercooler works better since it's getting washed with cold, not hot air.
So it's pretty common to be able to get more boost with cool, dry air than with warm, wet (less dense) air.
Since you're running in an overboost condition with a modified system, all bets are off. The ECU might be limiting boost based on intake air temperature - it knows that it has to limit boost under warm conditions. You can also be running out of turbo capability - the turbo can only provide so much compression (boost). Between the turbo and the intercooler, you might not be able to pull as much boost - not a BPC issue.
So it could be detonation (I have minimal faith in octane boosters) - warmer air is hotter (!!) and more prone to knock. It could be the ECU hitting a boost limit schedule based on inlet air temperature. And it could be just the turbo running out of oomph on warm air. Probably a combination of them all.
posted by 192.249.47...
Posts in this Thread:
- Cold Boost, Everett
, Tue, 29 Sep 2009 01:34:55- Re: Cold Boost, Everett
, Sun, 18 Apr 2010 15:17:56 - How old are your sparkplugs?, Bill Homer
, Wed, 30 Sep 2009 09:57:44 - Re: Common problem, usually caused by..., Street, Tue, 29 Sep 2009 18:25:38
- Re: Cold Boost, sam96CS
, Tue, 29 Sep 2009 08:15:01 - Always tough with a modified system, Ari
, Tue, 29 Sep 2009 08:07:06 <-- Viewing This Message - Re: Cold Boost, DanaH, Tue, 29 Sep 2009 06:41:37
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