02-15-2019, 08:19 PM | #1 |
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Boost loss from 3000-4000 rpm
I recently went from BM3 stage 1 to stage 2, and the first few pulls went well. But now when in any gear 3 or above and I floor it, pulls hard til about 3k then releases pressure almost as if I had a BOV and let off the gas, then goes up to around 4k and does the same again. Similar to how the car would react with traction control in the rain, except TC is off and the road is dry. I have new plugs and coils that I will be doing this weekend. I tried searching around and found one thread where they said their CAI was getting suctioned closed, I tried to stretch the elbow to no avail. Any ideas?
Two datalogs: http://www.bootmod3.net/log?id=5c6742a9ae729b7750fa2d61 http://www.bootmod3.net/log?id=5c6742a8ae729b7750fa2d5f |
02-16-2019, 02:45 PM | #2 | |
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Seems to be an issue exclusive to 6mt stage 2 cars that becoming more common.
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2013 F30 335i xDrive M-Sport 6MT (FBO/BM3 custom tune by HCP, 91 oct, 550i clutch, xDelete)
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02-16-2019, 03:46 PM | #3 |
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AFR doesn't look right at 100% throttle. Should be near 10.80 or a little richer, but it's showing almost stoich.
Your tuner should have picked up on this immediately. There's also timing pull when this happens. If you went STG2, that usually involves a downpipe, I'd suspect the O2 sensor first, but you never know with these flashy flash deals on the ecu these days. |
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02-16-2019, 07:51 PM | #4 | |
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The severe timing pull is a result of the issue he is having (ie. some sort of dme load/torque limit that makes the car instantly dump boost or cut throttle OR clutch is slipping which causes the dme to do this).
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02-16-2019, 10:25 PM | #5 | |
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02-16-2019, 10:42 PM | #6 | ||
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02-17-2019, 03:43 PM | #8 | |
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03-02-2019, 09:26 PM | #9 |
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Did u ever get any feedback from ptf on those logs and your issue?
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