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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
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Originally Posted by Craig 930 RS View Post
We're talking about air density into the *engine* - it decreases with heat compression, regardless of CIS or XYZ -

You don't get it. It's a closed system. Everyting that has been drawn into engine passed barn-door. And everything that passed barn door has been accounted for and corresponding fuel injected. Air (=oxygen molecules) annot magically dissapear or get bigger between engine and CIS just beacuse turbo compressed them.

If you pushed 13 g of air into engine, CIS will inject 1 gram of fuel. AFR=13. If turbo starts finding it hard to push that air into engine (beacuse it expanded) it will just inhale less, and CIS will push less fuel into engine. Status Quo.

Example: You have a bakery. There is a stream of dough passing trough a tube and flow-sensor of some sort. For every 14kg/sec of dough it passes out 1kg/sec of sugar. After that device, dough flows trough warmed tube where it expands. Dough cannot escape anywhere else, it must go trough tube. When it comes out of the tube, sugar is added.

Imagine someone turns up the heat in the tube after flow sensor and dough starts swelling more than usual, making it harder for pump to push it trough the tube. What happends is that flow slows below 14kg/sec, device senses it and starts adding less sugger. In the end, the dough is just as sweet as usual, but there is less dough coming out of the pipe.

Trust me on this
Thank you for your time,
Old 08-15-2007, 12:37 PM
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