2007 Suburban 2500

[JLeosnow]

I have read a lot of posts regarding the "torque management system" on the 6.0L engine vehicles and was hoping someone would be able to explain in detail how/what exactly it does or doesn't do and how it affects the vehicles performance. Once I understand it will help me decide if it something I want to do away with by having a "tune" performed on this vehicle(2007 Suburban 2500 LT3)?

 

Thanks,

-John

[C & A s Dad]

The system basicly removes some power and tq if you pull off from a stop at or close to full throttle. It also removes some hp and tq under hard accelertion before each shift if I remeber correctly. It is GMs way of protecting the drivetrain. It is my understanding that you can remove all or part of it with a custom tune.

[redvett]

For normal driving you will never notice it but if you do remove it and you brake something you most likely will have to pay for it.

[GeoHawk]

The system basicly removes some power and tq if you pull off from a stop at or close to full throttle. It also removes some hp and tq under hard accelertion before each shift if I remeber correctly. It is GMs way of protecting the drivetrain. It is my understanding that you can remove all or part of it with a custom tune.

Just to add a little more info, when you step on the gas the ECM/PCM decides how much to open the throttle (we've had electronically controlled throttle since about '03 on the trucks) and where to set the spark timing advance. For example, if you floor the pedal from a dead stop the PCM will only open the throttle body part of the way and retard the spark timing to prevent you from getting full power to reduce the stress on the driveline components. My '03 with the 6.0L when it was stock could not break the tires loose from a standstill if you punched it. After the PCM tune I could easily get two nice black strips down the road. It was like night and day. And throttle response was much better while driving too. Before the tune, when I pulled out to pass someone on a two lane highway, the engine would bog down for a couple of seconds before the rpm's started climbing. I really had to plan my passes accordingly, which is just stupid for a vehicle with that much power. After the tune, it would just get up and go right away.

 

And John, if you have the 6.0L in your Suburban, you should have the 4L80 transmission (like my '03 1500HD). Some may claim that you risk damaging the powertrain with a tune, but this transmission is pretty stout. As long as you're not powerbrakeing all the time and generally just driving like an ass, you shouldn't have any problems. My '03 now has close to 120K miles on it with about 110K of those coming after the tune without any problems.