GMT900 6.2 PPV Build Log

[swathdiver]

This is good data, you will see further down the timeline soon that it was down on power with the cam before I went and put a turbo on it. BTR estimates something like 60-70bhp with the cam in a 6.2, I expected at least 400whp on the dyno and had a suspicion something was up. It ties in with the blowby I observed.

Stellar idea, don't fear the gear! I've not yet decided what gear ratio I'll settle on when replacing this 3.08, maybe a 4.10? Need to pick between a eaton trutrac or yukon dura-grip too.

The non-ppv wheels that came with the car were on 265-65-18 tires. If I wasn't on these 18s, I don't know if the 4pot brakes would have fit under them. Wheels are on the list however. You mentioned going down the track, what size rear tire have you run? Anything in the 28x12.5 or even 31x12.5 range? Trying to get a grasp for what would fit.

It is a billet 278mm converter, part number 07-09-07-2A. I think with my end goal of 6-700whp its a good addition to the build. Even better it came with the car when I bought it. I am glad that the 6L80 was gone through, rebuilt and some choice upgrades done like this converter and clutches. The horror stories I've read about stock converter/stock tune 6L80s blowing up is a bit scary.

Turbochargers don't like to pull on gears like naturally aspirated cars do. 3.42s or 3.73s at most would be my recommendation.

We run that size tire on my pickup that makes 375 horses. We run Michelin Defenders on both of them.

For those higher horsepower motors, the heavier billet converters are necessary for durability even though they cost a little more horsepower to turn. As for the JMBX, well, we're still running them without issue, half a million miles on 3 trucks so far.

 

[Joseph Garcia]

Very nice build thread, and I wish you the best of outcomes with your modded truck. It is an incredible thrill when you give it the throttle and the truck leaps forward like a bullet in response.