we have a 09 cts-v cad with some mods to the motor to produce around 650 hp. The car has 6800 original miles on it and its primary use is drag racing. we purchased a trans from circle d in texas that is purpose built for this. We also purchased programming from them to tune the trans, from log files we send them. The trans shifts good and firm in all shifts, but the 2-3 shift has a "double bump" that at times is quite harsh. We have tried 8-9 different tunes, and cant seem to get rid of the problem. It also does it with a bone stock tune installed with a tech II. shift times are .23-.28 sec monitored live with the tech II. Circle D is having a hard time with it, and this has ben going on for a good month now. Any Ideas?
2009 cts-v 6l80e 2-3 double bump shift
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NEW!!!
I will make one calibration change for an additional $100 per change. For example, changing a shift point for a given gear is $100 vs changing a shift point and a pressure setting would be $200. That value can be used towards the full custom tuning price.
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