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BMW 3-Series (E90 E92) Forum
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How your timing should look
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05-26-2012, 04:21 PM | #2 |
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Why does ignition advance so much during the first ~1.3 seconds of the datalog prior to you depressing the accellerator?
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05-26-2012, 04:25 PM | #3 |
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Mine look like that even on high boost...
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05-26-2012, 04:33 PM | #4 |
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05-26-2012, 04:35 PM | #5 |
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05-26-2012, 04:57 PM | #6 |
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Because there is no boost. When there is no boost the DME will advance timing as if the car was NA. When the DME transitions into spool mode the DME then pulls the timing
Last edited by rader1; 05-26-2012 at 05:03 PM.. |
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05-26-2012, 05:24 PM | #7 |
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Here's one without meth...note that the boost is identically high at 16psi max...
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05-27-2012, 12:19 PM | #9 | |
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For what it's worth, on AZ 91oct fuel w/o meth and the high IAT's, I really can't seem to run much more than 11-12psi without seeing timing drop. :-( |
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05-27-2012, 12:51 PM | #11 | |
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05-27-2012, 12:52 PM | #12 | |
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05-27-2012, 01:24 PM | #13 |
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OP you should be able to run 14psi+. Your iats are too high for meth... You're fbo + vishnu pwm right? I usually see <80degF, even when 100deg ambient... Our dry air will show much greater temp swings then other areas.
I target about 8 deg advance in the mid-range ramped to about 11deg at 6000rpm with boost at 14.5ish midrange. Somethings not right in your setup with 35+ C iats. Ill check my logs again soon to confirm. |
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05-27-2012, 02:49 PM | #14 | |
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05-27-2012, 03:00 PM | #15 | |
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Yes, GIAC Stage 2 Race.
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