[Harry_11K]

I've had my 18' M2 for a few months now and have an interesting problem.

The car is currently running BM3 stage 2 93 tune.

In comfort mode only between shifts at around >60% throttle when clutching in the RPM's will jump up.
Example: 2-3 shift at WOT, clutch in at 5500 RPM the RPM will jump to 6000+ RPM. Definitely doesn't feel safe. It does not happen in sport or sport+ only comfort. Also didn't occur with the stock tune flashed.

I have a feeling this might have to do with the diverter valve but any input would be great. (Not sure if my car has stock DV or not)

[ericlr1225]

any clutch/shifter mod?

[Harry_11K]

Originally Posted by ericlr1225

any clutch/shifter mod?

Just a clutch delay valve (CDV) delete. Happened before removing it though. And no amplification of the issue after being removed.

[Harry_11K]

Going to run a few datalogs and add it to the thread.

[designatedposter]

do you have latest version of the tune? i recall bm3 made some tune changes for shifting logic in the m2 n55 a while back.

i recommend you reach out to bm3 help directly.

[Harry_11K]

Reached out to BM3 with datalogs and they said boost spikes are normal when you let off throttle. Waiting to hear back from them since I attached this video now.

Each time you see the RPM’s jump is when I clutch in. Also forgot to mention in original post that I have a CDV delete.

video

[ericlr1225]

Originally Posted by Harry_11K

Reached out to BM3 with datalogs and they said boost spikes are normal when you let off throttle. Waiting to hear back from them since I attached this video now.

Each time you see the RPM’s jump is when I clutch in. Also forgot to mention in original post that I have a CDV delete.

video

I'd run ISTA to check first and re-calibrate the throttle.
If the issue remains, check plugs and injectors. Logs would help

[Harry_11K]

Originally Posted by ericlr1225

I'd run ISTA to check first and re-calibrate the throttle.
If the issue remains, check plugs and injectors. Logs would help

I have to find someone with ISTA but good point. Here is the logs.

https://bootmod3.net/log?id=65e2aa7dc589af3c359f0d7a

https://bootmod3.net/log?id=65e2aa7d909e963e4e3c2157

[Harry_11K]

Update 3/7/24:

Recieived a test map from BM3 and the issue is resolved. Great support as always!