Well, I 'thought' that tweak made the rate at least stable, but I may have spoke too soon.

Tried it again last night, this time both sitting still and while driving, and it was still dropping to 0 and was unreliable. Came up with a red OBD Response Rate warning in the readiness check. Any other ...

That seems to have fixed it, at least in the sense that it seems to be a stable connection now, thanks! Which update rate is the important one? I'm seeing around 3.5-4 hz on the PID update rate, around 1 to 1.5 hz on all the others. Anything else I can do to speed up the responsiveness/rate?

I have a US Spec 2002 BMW E46 M3.

I initially tried using your laptimer with a generic ELM OBD adapter, with no success. Figured I'd try one of the recommended adapters and see if that was the problem, so I bought the OBDLink LX. Connected it to the laptimer, same issue. The most I ever see is ...

My last 2 times out at the track, I've had what seems to be an issue with my external gps "disconnecting" from HLT mid-session, or sometime after starting with everything green.

I'm using an LG G4, with the aforementioned external GPS. I've already updated the firmware for the GPS, and this has not ...