This is our new Suburban to a T. I hate taking off at busy intersections with ppl in it, because they either whine about how "hard" I'm hitting the throttle or how slow I went through the intersection. I need to get a tuner on there that removes the lag.Gas and diesel both suffer from this to some degree. Some have you slammed into the seat when the computer finally decides to open the throttle you are already 1/2 way to the floor.
But if I kept the DPF to keep the warranty, will the tune still work? Also, does the instant power damage the allison any (because the allison is built for how the truck is built?), or is the allison built for how the duramax runs before dpf is installed?The LMM stock is laggy due to the DPF programming insiude the ECM to reduce soot loading of the DPF. With a tune teh LMM runs just as strong as an LBZ does, and they are virtually lagless. I tuned one for somebody and it is just about brutal how instant the power is on a stock trans safe tune I built for it. You can take a bone stock LMM though and eliminate the DPF and make the changes in the ECM to shut off regen, DPF protection as well as kill the EGR and it will RUN STRONG!
You need to ride in the LMM I tuned, it will flat fool you it is a diesel with how quick it comes on. The ALLISOn gets damaged during shifting, so the power coming in quick doesn't hurt it. This is why a mild built ALLISON will hold 1000HP sled pulling, but put 700HP to the same trans and race it and you will be lucky to get 30 passes out of it. And ANY tune, and I do mean ANY tune will void your warranty on an LMM. GM can see if a tune or even an add on power box is installed on an LMM by doing a CVN history search in the ECM, a torque input check of teh TCM, or a fuel used history check in the BCM. And changing the tuning with a DPF is about pointless. Adding any fuel or timing changes will just cause the DPF to load faster and cause more regens.All of these trucks in stock tune are plenty powerful but they do not have the instant throttle response of a gasser because they: 1) have to spool some and 2) because they are made to not throw a boatload of power into the trans all of a sudden.
There isn't a comparison to any gassers for the amount of power. That's why the DMaxes got the Allison. It handles the load and is NOT something to worry about. I had an 8.1 / Allison and since it was lower torque, it came on quick. The DMaxes, you ROLL into it. It takes a while to get used to it but it's second nature after a while.
That's like how it is in my Truck with EFI now. If I'm on the Highway Cruising at about 60mph, and I put the Petal to the Floor, it's almost like (in this Order, but very Fast) the Engine Shuts Off, the Trans Downshifts, the Engine comes back On, and I take off.The edge I have on my LBZ seems ok as far as throttle response. It does have some lag in certain situations that I am still getting used to though (compared to my 6.5s). Gotta wait for my tranny to "pick" a gear before fully mashing on it.
You can cut some of this back, but your putting your trans in danger in doing so. It is just the nature of the beast so to speak.That's like how it is in my Truck with EFI now. If I'm on the Highway Cruising at about 60mph, and I put the Petal to the Floor, it's almost like (in this Order, but very Fast) the Engine Shuts Off, the Trans Downshifts, the Engine comes back On, and I take off.
It's def. not something I'm used to.