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neuroclast neuroclast is offline
Junior Member
Posts: 101
Join Date: Nov 2015
Car: BMW 335i
Default 09-10-2017, 05:29 PM

Originally Posted by CedarPerformance
Try relocating your JB4. This is a known issue with Bluetooth interferences, not a failure of the jb4. I was working on a car dropping FF values constantly, but the jb4 was still doing its job. I verified by using my laptop instead of the Bluetooth. Solid logs from that point out.

This product is no longer supported, but I am working on a Bluetooth extension cable with different shielded housings to try and remedy this issue. I'll post here when it's done, whether or not it actually fixed anything.

Sorry boss, big v8 has a lot of noise. If you need to tune the car, try using a laptop if the Bluetooth is standing in the way. If the car runs fine, hang tight. I've got multiple customers begging for a solution, so I'm going to do what I can.
Well I'll go pick up a USB to serial cable tomorrow and find out for sure, but I have a hard time swallowing that EMI is causing the jb4 to switch Maps to 0.

I also tried moving the jb4 inside the DME box and got the same results.
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