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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
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Quote:
Originally Posted by Craig 930 RS View Post
"Only thing that will happend is that your turbo will work harder and won't be able to pack as much air into engine as with cool temps."

.......which changes the AFRs, no?
Nope. You see, turbo sucks air trough the barn door, then compresses it. So regardless of how much it heats up the air, it always has to suck it trought the barn-door. Rembemer, air drawn trough the barn-door is uncompressed and proper amount of fuel dispatched. If turbo heats it up it'll expand and turbo will have harder time to cram as much of it into engine. But amount of fuel measured proportional to air drawn trough the CIS will stay fairly constant.

That's why it's called Air Fuel Ratio...you draw x amounts of molecules of air trough CIS, it squirts X amount of fuel into engine. If it heats up air afterwards, it's turbochargers problem...fuel for that air will be delivered. Turbo just won't be able to suck as much if it gets heated, thus power-loss.

Granted, CIS has no provision to compensate for outside air temperature, thus margins in it's AFR's.
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Old 08-15-2007, 09:12 AM
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