Anybody drag race with an lbz??

[kevenneu]

Thanks for all the feedback guys. To answer some questions:
I only was able to make 2 passes on one of the last days the track was open for the year, they were crazy busy. Didn't get a chance to play with launch rpm or boost. Basically left off an idle in 4x4 to make sure the run counted and to not tear up the surface with my street tires for all the radial cars out there that day.

The truck chassis and drivetrain is all stock 2006 2500hd, 3.73 gears and 265 tires.

First pass at 70 hp and during 2nd pass at 150hp trans REALLY didn't know what to do. Hence I ran about identical times both passes. I should have relearned clutch apply with my scanner first then drove it. Next time.

No lift pump and I didn't watch rail pressure during either passes but didn't limp or set a 0087. But I guess i could have been losing it on the big end and that's why it ran the same mph.

Thanks, keep the ideas coming

 

[2004LB7]

Definitely looks lazy in the 60 and 330. I bet with a good tune, proper suspension and tire setup you can knock a second off that time. Possibly a smidge more. But you're going to have to do a boosted launch

 

[DAVe3283]

You don't need to reset the adapts when changing power levels, you just need to give it time to learn the change. E.G. flash the hotter tune, then do a 1/3 throttle run a couple times until it's shifting like stock again. Next do 1/2 throttle until it's happy, then 2/3, then 3/4, then 100%. That way it can start adapting the shifts without getting totally blindsided by a massive change in power output the moment you hit the drag strip.

If you ever add a BCM to get T/H working is you can use that for the big tune, since normal and tow/haul have different adapt tables. Then you can change tunes on the ECU and not need to relearn the trans for half a day.

Sent from my FlashScan V2 using Tapatalk

 

[JoshH]

Thanks for all the feedback guys. To answer some questions:
I only was able to make 2 passes on one of the last days the track was open for the year, they were crazy busy. Didn't get a chance to play with launch rpm or boost. Basically left off an idle in 4x4 to make sure the run counted and to not tear up the surface with my street tires for all the radial cars out there that day.

The truck chassis and drivetrain is all stock 2006 2500hd, 3.73 gears and 265 tires.

First pass at 70 hp and during 2nd pass at 150hp trans REALLY didn't know what to do. Hence I ran about identical times both passes. I should have relearned clutch apply with my scanner first then drove it. Next time.

No lift pump and I didn't watch rail pressure during either passes but didn't limp or set a 0087. But I guess i could have been losing it on the big end and that's why it ran the same mph.

Thanks, keep the ideas coming

It's easy to see from that time slip that your off-idle launch is why it ran so slow. Your trap speed indicates an easy 13 second time slip. Could be very deep 13s depending on how good your chassis/tire setup is and how well the transmission shifts. I would expect you to pick up a significant amount of both ET and MPH with a good launch.