Re: how does coolant through throttle body affect performance? n/m - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: how does coolant through throttle body affect performance? n/m
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Posted by REM in Seattle (more from REM in Seattle) on Wed, 18 Jul 2001 18:04:22 Share Post by Email
In Reply to: how does coolant through throttle body affect performance? n/m, matthew, Wed, 18 Jul 2001 17:32:10
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In theory, the colder the air going in to the engine the better. Cold air is denser, therefore contains more oxygen, and can be combined with more fuel for more power (assuming a 14:1 ideal air fuel ratio, etc.).

. The position of the engine air inlet, the heat add by the turbo charger compressing the air (hence the intercooler, basically an intake air radiator, to try to cool down the intake air), the conduction/convection/radiation of engine heat to the air intake system, and many more factors.

Since the throttle body is heated by the engine coolant, it transfers heat to the intake air and reduces performance (in theory). The throttle body is heated because cold moist air will freeze when going through the throttle body causing the engine to die (due to the venturi effect).

So, in theory, anything done to decrease the intake air temperature is good. Some of it is just not practical.

Things that have been done by BB members and have worked well, include insulating the intercooler intake and exhaust tubes, fitting more effecient intercoolers, insulating the airbox.

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