Problem unsolved
Weistec stage 2 2009 C63
Car car idles and drives fine if I just plod it about all the way up to and we’ll into motorway driving speeds
But punch it in C and it bogs down!!! won’t Rev past 4 grand… revved at park or neutral it won’t go past 4 grand
Interestingly punch it in S and it bogs down and it changes to C
Same in M in any gear… punch it and it bogs and changes to C
It has thrown NO codes … Star Tech scanner confirms
no gearbox codes… been checked over by gbox specialists…nothing wrong with the box
had a fresh Weistec map installed…. No change
So No Codes!!! So assume not gearbox or trans module…. Assume not ecu in general
my last thoughts… traction control… but effectively an 09 does not have traction control in the same sense of what later cars hav… an 09 does not have launch control
Anyone else got any ideas
you can discount battery, injectors, coils, fuel, fuel pump, throttle bodies, SC belt slip, vacuum leaks
I'm with INS1GNIA, could be a tuning problem. A platform like HP tuners would be helpful to do some logging and see what's really going on, or have more information to review.
I'm with INS1GNIA, could be a tuning problem. A platform like HP tuners would be helpful to do some logging and see what's really going on, or have more information to review.




(by the way, around here Weistec “stages” usually refer to Stage 1, 2 or 3 supercharged cars)
a stage 2 weistec car should be pretty solid. I'm sure these days the out of the box tunes from them are pretty weak.
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Do you have traction control fully off or in Dyno mode to test? Have you reset the ecu to remove all trims and tested?
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