xxxscimitarxxx

After a lot of weeks with C63 specialist company an issue remains 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

INS1GNIA

Could always try a different tune. Maybe not the most cost efficient way, but that would be my guess.

YYCStage3

I had an issue with my initial Weistec stage 3 tune. The car wouldn't rev up, just basically went into limp mode, no codes. The ECU was sent back to them and they "adjusted it" without any real explanation, which ultimately did fix the issue.

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.

Panzerbiscuit

Agreed. Data logging will be able to assist with diagnosing any issues you have, or at least help you rule out what isn't causing you strife. Hachiroku can provide you with a second tune, just to rule out any tuning issues as the culprit of your problems

BLKROKT

Nobody knows what your “stage” number means. People throw it around and it usually means 7 or 8 different things. Post up your mods so someone can help you understand what might be going on.

(by the way, around here Weistec “stages” usually refer to Stage 1, 2 or 3 supercharged cars)

roadtalontsi

park and neutral if vehicle speed is a standstill has a rev limit at 4k. that is normal. Does it do the same thing in dyno mode?
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.

hachiroku

flash back to stock if you have a handheld to see if it's the tune. if its the tune reach back out to your tuner for an updated tune. if you identify that the tune is the issue and are looking for a end to end custom tune for your setup, feel free to reach out. we have many customers who previously had a weistec tune and felt it was barely any better than the factory tune.

blurred

In your older thread someone told you to replace the MAP sensor... did you?

Do you have traction control fully off or in Dyno mode to test? Have you reset the ecu to remove all trims and tested?