06-08-2021, 05:27 PM | #1 |
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Loss of power.
I was recently out with some other guys on a run through the Scottish hills and noticed I was struggling to keep up with other cars with considerably less power than what a stage 2 f10 m5 has. So I done some dragy runs and it turns out I’m doing 100-200kph in over 8 seconds when it should be 6-7 there abouts. I have a stage 2 map from a reputable mapper, eventuri intakes and decats. I did runs before all the modifications and the times seem to match the standard figures very closely so I’m definitely losing power.
I noticed occasionally I’ll get surges of power almost like a pulse of power when loading up the car. I’ve done some logs the car will occasionally hit 1.5 bar boost pressure but seems to be very sporadic and not always and sometimes no where near. I’ve checked all the accessible areas where boost could leak everything’s tight. I’ve ordered new boost pressure solenoids, has anyone fitted these before and are they common to fail on the m5 I’ve not seen much about it when doing a google search. Thanks in advance. Last edited by Mikeyang; 06-09-2021 at 03:16 AM.. |
06-08-2021, 05:53 PM | #2 | |
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Can you flash back to stock and see if it fixes it? |
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06-09-2021, 04:19 PM | #4 |
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What tool are you using to monitor the Knock sensors?
I would hook the scanner up and watch knock, timing, and all AF values. Somewhere your DME is seeing an issue. I dont think you have a boost leak. The DME would see that the pressure is not consistent and throw a cell. I had a boost leak in bank 1 charge pipe and i got a cel right away. It was babk 1 rich value beyond threashold. Last edited by AnotherM; 06-09-2021 at 04:25 PM.. |
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06-09-2021, 04:45 PM | #5 | |
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I’m hoping it’s the boost solenoids to be honest. I loaded the car up tonight in 6th I’ll upload the pics the boost fluctuates a considerable amount. |
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06-09-2021, 05:00 PM | #6 | |
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You are definitely not holding consistent boost which sounds more like a WGA or solenoid issue than anything, but without monitoring the car to see which bank or where the pressure is dropping, you may be looking for a long time. I would Order a foxwell nt510 or comparable scanner if i were you. Good luck bro, |
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05-13-2022, 06:54 AM | #8 | |
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Drives: BMW F10 M5
Join Date: Jun 2021
Location: Houston, TX
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