LBZ: LBZ tow tune

MarkBroviak

DMax Junkie
Vendor/Sponsor
May 25, 2008
2,140
495
83
Danville Indiana
Whatever crazy grade braking algorithm GM uses will brake up to 3K+, but Ive only seen it once. Tthats part of the reason the LBZs tac is different then the rest. GM got tired of calls from freaked out owners that their trucks where turning that kind of rpms.

They will grade brake all the way to 4700rpms before a forced upshift to bring the rpms back down but won't accelerate past 3250ish stock. That's why the tachs are like that. Then they changed it with the LBZ's like you said.
 

Dozerboy

Well-known member
Jun 23, 2009
4,914
495
83
TX of course
It would make some boost that for sure. Not sure the RPMs, but I hit 20psi last night. I don't run a grade braking tune this was with the turbo brake switch like the med duty truck run.
 

Dozerboy

Well-known member
Jun 23, 2009
4,914
495
83
TX of course
Well I bet that was fun. :thumb: Rear locks up over compensate by mashing the gas and start spinning the tires after the trans does some horrible bucking. Look in the rear view after you get it under control to see if their is a pile of important parts in the road.
 

hondarider552

Getting faster
May 28, 2008
10,627
2
36
34
Arizona
Ran this tune up to 7000' and snow past day or 2, 450 mile round trip all highway netted me 19mpg. Not bad for most of the trip was 70-75mph.
 

dylon333

Member
Dec 24, 2017
173
1
18
Anybody still have this file? trying to find a bunch of tune to look at to try to learn as much as possible before I start tuning my first lbz