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· TylerWatters726
47 Posts
Discussion Starter · #1 ·
I have a 2004 GMC Sierra 1500 Z71 with the 5.3L, 3.73 gears.

I have a cold air intake, and Borland exhaust.

Recently purchased a SCT iTSX tuner, it works great as far as just being nice to use with just my phone.

Only problem, I don't understand the adjustments and the user manuals aren't a much help so I'm wondering what all this does and approximately where I should set the the stuff.

I set octane at 93

Timing 0-2000... 0 to -14
Timing 2000-4000.... 0 to -14
Timing 4000-6500... 0 to -14

WOT Shift 1-2... -5 to +5mph
WOT Shift 2-3... Same
WOT Shift 3-4... Same

Shift Firmness 1-2... -25 to +25%
2-3... Same
3-4... Same

WOT Fuel/Air Ratio... 0 to 10%

And then I understand the Neutral and Drive rev limiters.

I'm just clueless where to put the other stuff.

Was thinking there was a just a Performance, towing and economy tune but they don't pop up.
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