I am getting the PCM tuned by wheatley hopefully this week, Im running a 2003 rcsb Sierra, 4.8L, 3.73's, 4l60e, and everything is stock except for exhaust, how should i have them tune this? I know i want the speed limiter removed and able to run of 87 octane gas, and i want a good amount of TM removed, any suggestions?

 

Step up to the 89 octane at least. If you can do it, get the e-fans and 160 Stat installed. I know it not cheap but it will help. I have the '02 ecsb and those mods did make a difference.

 

In my personal opinion tuning for anything less than Premium fuel is a waste of money. The difference between 87 and 91 is ~$5/26 gallons AND the added power will more than compensate. Talk to Wheatly about it.

 

I agree, what is $5 more per fill up? Its worth it to get it tuned for 91.

 

Definitely.... but if you can go to 93 do it

 

If your going to do it, Might as well get the most performance out of it that you can.

 

ok, screw it go with a 92-93 octane tune, yea i completely forgot about the efans, i have some 05 oem ones with the bigger radiator and everything all ready to go in, thanks

 

you people and yer 93 octane. makes me wanna kick cats.

 

Go for the 93, why spend the money on a pcm and not utilize all the available power? Leave 25%-0% torque management on, IMO.

 

ya go for the 93.. thats all i put here..