So this past weekend I was pulling a trailer around Dallas and noticed with the T/H button pressed, the turbo held at 1 PSI with my foot off the go pedal. I turned off the T/H option and it would immediately go to 0 PSI under the same circumstances. So since I'm running level 1 on my EVO, I detuned to stock and got the same results.

Did the LBZ come from the factory with a bit of a turbo brake? Surprisingly it helped but then I was only pulling 3k-4k lbs.

ha ha, no. im assuming your talking about slowing down? i know then my truck is in t/h as soon as i take my foot off of the go pedal it starts to slow down. but, the lbz does not have a turbo brake on it. when the t/h mode is on and your slowing down basically all it does is downshift the transmission, while simeltaniously locking the torque converter. in the ends its like jamming it into a low gear, at high speed - using the engine to slow the vehicle, soooo, when it does this, the engine rpms come up so it pushing more air thru the turbo thus making residual boost. i wouldent pay much attention to it.

So this past weekend I was pulling a trailer around Dallas and noticed with the T/H button pressed, the turbo held at 1 PSI with my foot off the go pedal. I turned off the T/H option and it would immediately go to 0 PSI under the same circumstances. So since I'm running level 1 on my EVO, I detuned to stock and got the same results.

Did the LBZ come from the factory with a bit of a turbo brake? Surprisingly it helped but then I was only pulling 3k-4k lbs.
EVO Level 2 has the turbo brake.

EVO Level 2 has the turbo brake.

Yes, I know.

Not to hi-jack, but if where on the subject. When I was towing a few weekends ago, when the truck down-shifted it made a lot of noise and almost sounded like when it down shifts it engages the fan clutch? The engine brake did work well just a lot of noise coming from the fan clutch, or so it sounded. It seemed like it took a min. of driving or so for the fan clutch to disengage.

^^^^^^^^^^^^^^^^

When was the last time you updated your EVO? They added the turbobrake feature into levels 1, 2 & 3 now, so it could have been that.

So this past weekend I was pulling a trailer around Dallas and noticed with the T/H button pressed, the turbo held at 1 PSI with my foot off the go pedal. I turned off the T/H option and it would immediately go to 0 PSI under the same circumstances. So since I'm running level 1 on my EVO, I detuned to stock and got the same results.

Did the LBZ come from the factory with a bit of a turbo brake? Surprisingly it helped but then I was only pulling 3k-4k lbs.


What RPM were you at?

Assuming sea-level baro pressure, at zero throttle (coasting) the stock LBZ tune will try to make 1psi @ 1500rpm up to 2.4psi @3000-4800rpm. It's not designied as a turbo brake, it's barely enough to make even a slight difference. If I had to make a quess as to why, it would be to try and maintain some shaft speed to reduce lag when coming off of a no fuel condition.

I wish my '07 came with a turbo brake but GM wasn't smart enough to install those until 2011. Even though the 6.7 Cummins has had one since it came out....

When was the last time you updated your EVO? They added the turbobrake feature into levels 1, 2 & 3 now, so it could have been that.
I havent upgraded in a few months (mid summer?) but I did email Edge CS about two weeks ago about adding the brake to level 1 and was told it wasnt going to happen. Maybe they did and CS doesn't know about it.