Yes, TCU tuning is independent of ECU tuning. You could run a stock ECU with a tuned TCU, a tuned ECU with a stock TCU, or both stock, or both tuned...

On the 5-speed tranny cars, the TCU is located under the passenger-side footwell carpeting. You have to fold-back the carpet, unscrew a metal plate, unscrew the TCU from the backside of that plate, and unhook the two cable connections that hold it in. So, while not difficult, it is a bit more involved than pulling the ECU from the driver's side engine bay.

Some tuners sell these tunes separate; others prefer to sell them packaged together. YMMV.

 

would you recommend MHP's TCU tune? Did it make that much of a difference? How bout the TCU with the LET tune? what are you thoughts?
Thanks,
Bobby C.

 

You know, that's a really good question. My opinion is likely skewed since I've never had an optimally tuned ECU functioning in concert with an optimally tuned TCU. That said - candidly, for the C32, I wouldn't.

Earlier in the thread, MHP mentioned that the Group Buy pricing for a TCU-only C32 tune is $1,500 - I don't feel it provides enough of a benefit to warrant the expense. Consequently, unless you have money just burning a hole in your pocket, my honest opinion is that a $1,500 TCU tune is not worth it for our $17-18k cars.

 

+1
Neither do $1500 ECU tune. However, less than $500 would be a lot of considerations I believe.

 

Appreciate the insightful reply, c32AMG-DTM.

Your reasoned and articulate posts are indeed a valuable asset to our forum. Thanks again!