Well another post talking about swapping ecus, brought a thought to this brain of mine.

If you ran the Gm ECO S/C reflash on a N/A ECO would this hurt, help, or be plain stupid?

I was wondering because I wanna swap in a 04 Reflashed for the supercharger into my 03 in prep for my turbo kit later on down the road.... so would this hurt the car or help? Im not 100% sure on what all the reflash does.

I do know it works to give the car a steady stock"ish" Air/ fuel while adding more fuel, that compensates for knock from the S/C's boost. How it gets there I have no clue, but the point is if I were to be running my intake, high flow cat/ catback only and swap in the flashed ecu for the time being would it hurt the car??

Any thoughts on this would be great!!

I don't think it would be a good plan to use prior to being boosted

Reason being is that the ECU will be confused because at WOT it will be looking for boost but will not read any boost from the MAP

I would suggest just waiting until you complete your turbo install, then putting the reflashed ECU in




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You are going to throw codes like crazy, and run like crap.

I got the Flash BEFORE I installed the SC (Flash at the dealership-drove 10 minutes to install site) and this is what happened to me.

I would suggest NOT doing it.


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its in the area of stupid

just get hp tuners you can do alot more with that



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Don't do it, it pulls a lot of timing, you'll lose performance, its meant to control the HP from the supercharger, it doesn't give any horsepower itself.





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I had pretty much figured all of the things stated above. THank you anywys guys!