Final test and tune on this EVS 1590 supercharger.

Update: in summary.

1. Claims by forum vendors that this kit has been selling like hotcakes for C6s proves to be false.

2. Proof of that is the end findings is the canned black box tuner that comes with this kit had the wrong TCM software that was for a non Corvette 6 speed auto transmission

3. This means no one QA tested this design and that this was the first one being installed so many of these could not have been sold.

4. Worse is the canned tuner box is doing dirty forced flashing as it did not even compare it's software to what version it was flashing into the TCM

5. Being it was the wrong trannie software if caused the A6 trannie to improperly shift.

6. The owner took this 2008 LS3 C6 to a Chevy dealer who using test tools assumed the TCM was bad.

7. Even though car is under full GM warranty of course GM refused to repair under warranty since software found in TCM was hacked thus C6 owner was charged $600 for a new one.

8. With new TCM and GM stock software the functional problems went away. Using the SCT tuner ( that was tuned by HPtuner company) the functional problems returned.

9. it took SCT over 2 weeks and 12 different TCM flashes to figure out wrong software was being used so again this EVS kit has not been installed by other C6s with A6 trannie

10. Their tuner box is a all or nothing, you push a button and it force flashes both the PCM and TCM thus the PCM tune we did for the engine was lost.

11. Finally they correct the TCM and owner gets car back but the engine and A6 trannie do not run well

12. This kit comes with 52 lb/hr fuel injectors and a higher flowing internal fuel pump. Problem is GM does not allow larger injectors in the injector flow table and in scanner data we found no difference in flow with the larger fuel pump

13. This becomes a problem in engine loads where fuel trims are too rich as you cannot go beyond the injector table limits and command the injectors to flow less.

14. Keep in mind since this design has water cooling for intake will reduce lean issues and hence less fuel demands are needed so using too large of fuel injectors will be an issue

Met owner today and I spent 3 hours cleaning up their tunes which are not very good.
As you see in results the gains when we properly custom tune PCM and TCM

Results on left side is testrun with their tunes installed
On right side is with testrun with our custom tune installed
increased torque by 50 ft/lbs and HP up about 90 at flywheel thus the finding is if installing this EVS kit do NOT use their canned tuner for any reason.