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      11-15-2009, 12:11 PM   #31
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Drives: 1999 528iT, E53 X5, E46 325xi
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Originally Posted by quattr0 View Post
Forgive my gasoline mind but why would you wait for turbo to spool up? Diesel turbo is much diff from gasoline one?
the a/r housings are a bit bigger than gas turbos. PLus they are set up as compound units if I remember correctly, not individual turbos per group of cylinders. Spool-up time is also affected with injection timing as well. i believe if you start the injection process earlier in the crank revolution, its like increasing timing in a regular car. A little is good, but too much is bad. Causes extremely high pressure spikes that even a diesel cant withstand...and you lead to cracked pistons, broken rods, etc...