Hobbywing v2.1 problem

[Gunthar Guntharsën]

I'm having a problem with my HW 2.1 120amp, which appeared out of nowhere. Car was working fine one day, I pack up ... a couple of days later I go to the track and now it's doing this.

On the bench it doesn't have the power to make the slipper slip, unless I turn up the DRRS boost setting to 3. I had the DRRS on 1 before and never had a problem making it slip. On the track it runs well but it doesn't have the top speed it had before. It's like the turbo timing isn't kicking in.

So far I have:

replaced power cap and wires
tried different sensor wire
different motor
different receiver (with transponder and servo disconnected)
reflashed the firmware twice

Soooo .... I have no idea

Any thoughts?