Any feel like having a tuning discussion?

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Originally Posted by ChevyHighPerformance

It's not that GM doesn't know how to optimise performance (look at the C5R), but is forced to for manufacturing tolerances, warranty issues, etc.

So a custom tune is one made for your vehicle - kinda like a custom suit.

I agree with Chevyhighperformance on this one; GM does have to produce a calibration that is designed for all factors, where a custom tune can increase performance. I had one on one of my Vettes, and it worked well. This was a custom tune loaded by a LS1 program, not a standard tune off a hypertech type device. Most of the standard tunes on the hypertech type devices are not much help.


As for testing, I understand that no tuner does long term testing prior to releasing a tune; the purchaser becomes the tester. What I was implying is your statement that there was a durability fault with the existing program (and which one, there have been at least two different updates since introduction, and there might be more, I haven't checked in a few months), and GM has quite a few production vehicles out there with high mileage; and some very early mules with tons of mileage, and no major durability problems I know of have been found. Those that were found, were updated with a new calibration, and then nothing really fixed in the new cals with durability.