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Update on GFB and MHD and JB4
I realize this is an old post but wanted to add my experience for anyone looking for more data.
I replaced the DV in my 2011 335xi 6mt with the GFB+.
I had JB4 and MHD installed before the DV upgrade (and would switch between using both with the MHD as a backend flash and also with the JB4 off and the MHD on map 2).
After the upgrade, I was getting very little boost and a fault code 2C90 Blowoff valve clamped closed.
To troubleshoot I disabled, set to stock, and uninstalled MHD and JB4 in multiple combinations.
What I found is that by completely uninstalling the MHD and just using the JB4, I was able to get full boost and the fault code went away.
I followed up with MHD about this but didn't get any useful information or advice.
Support experience:
- BMS, (Terry), has been very helpful and quick to provide assistance and advice to work out anything with the JB4.
- GFB, (Brett), is also very helpful and great to deal with.
- MHD, is not very helpful. Like dealing with a child.
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