I have some interesting news for people who don't like that the MPH TCM tune doesn't shift by itself in Autostick. This is always confusing to write/read. With my TCM tune (not everyone will have this) I have to upshift in Autostick. It's not like stock when you hit redline it upshifts for you. I have to shift from 1st - 2nd - 3rd...don't need 4th In Drive you don't have to upshift. It just shifts at redline. Pretty much like the stock Autostick upshifts. I made about 8 passes tonight. 3 in Autostick and 5 in Drive. My fastest passes of the night were in Drive. The best I did in Autostick was 12.97. My best times in Drive are: This is my fastest MPH RT - .105 60' - 1.842 330' - 5.318 1/8 -8.226 MPH - 84.10 1000 - 10.747 1/4 - 12.881 MPH - 106.79 Corrected 12.581 @ 109.388 This is my fastest time RT - .294 60' - 1.822 330' - 5.287 1/8 -8.19 MPH - 84.18 1000 - 10.706 1/4 - 12.824 MPH - 105.29 Corrected 12.522 @ 107.852 Video of the 12.88 pass. http://www.youtube.com/watch?v=B7ZWlO_j6_s Let me know if you guys have any questions.
So what is the interesting news? The predator gives you a choice. You can choose the shift behavior you described or you can choose the stock behavior.
I thought that if you changed the AutoStick behavior in the Mopar TCM with the Predator that it "bricks" the Mopar TCM? The TCM ends up being taken back to stock programming. I know there are some parameters you cannot change on the Mopar TCM with the Predator or you trash the TCM. I thought this was one of them. ..
The interesting news is that I made my fastest pass in Drive, not Autostick. With the stock TCM the fastest way down the track was putting into Autostick. But with Andy's (MHP) new tune you don't have to shift into Autostick. You can just leave it in drive. Since, he approaches the tune for WOT and part throttle you can do all your DD and track driving in Drive.
You are not running the Mopar performance TCM? Andy at Modern Horsepower "tuned" your TCM? Did he do it with CMR software? ..
Nathan, No, Mike is not using a Mopar TCM. Yes, Andy from Modern Horsepower. Andy sends the TCM off to a third party for tuning.
I don't agree that the fastest way down the track with the stock PCM is in autostick. Automatic or autostick are the same. At WOT both will upshift at the shift point (not the rev limiter but the shift point). The Predator gives you the option to have autostick hold the gear or the stock behavior of upshifting at the shift point. It's no surprise that you're slower if you have the PCM hold the gear in autostick. There is no way you can shift more precisely than the PCM to consistently hit the shift points. By the way, changing that behavior on the stock PCM/TCM is a matter of programming the PCM, not the TCM. The stock TCM has a number of different "modes" it can be set in through it's interface to the PCM. To change the behavior you're programming the PCM to set the TCM in a different mode. The TCM is not programmed directly. For example the R/Ts can (with Predator) increase shift firmness by putting the TCM in the SRT8 mode. Note: (for Nathan) This is why you can "reset" your Mopar TCM with the Predator. The Mopar TCMs have something like an additional mode they can be set to. If you change the shift mode with the Predator it will put the TCM in one of the two modes we're familiar with. Then the Predator is unable to put it back into "Mopar" mode so you effectively have a stock TCM after that.
That makes sense.. And is what I thought, but would only usnig the Predator for changing the TCM for AutoStick mode with auto upshift or manual up shift mess with the Mopar TCM? I can see how changing "shift modes" can ruin "Mopar" mode. ..
That I don't know. Not sure what all they change for the different transmission/shift parameters. Also depends on how they implemented them in the code. If they write everything having to do with the transmission and shifting no mater which parameter you changed then yes. But that would be really bad program design and I doubt they did that.
There was a Predator thread somewhere about this... and it was explained what TCM related changes you could make wiithout ruining the Mopar TCM. ..
Yeah you guys have to understand even though the Jeep has the same engine that is where the similarities end. There are several options on the Diablo for the LX that the Jeep does not have access to due to the differing gears, transfer case, AWD and Torque converter. I'm sure I missed a few but it has been proven at the track and by simply watching the RPM's on the dash that when you put it in Autostick (1) and let the jeep shift itself it will shift a a slightly higher RPM then leaving in (D). As far as the other stuff about the PCM/TCM I have no idea how it all works.
Oh... Crap.....damn "New Posts" section. Here i am lost on the SRT8 Cherokee forum.....lol Well the 6.1 LX cars don't get allthe Predator shift modes either, but we do get to chose between auto upshift or manual upshift in AutoStick. What knid of enhancements does Modern Horsepower do to the "MHP" TCM? ..
Okay.. I am still curious. What is the additional benefit of the TCM supplied by Modern Horsepower? Who is the third party? Do they only do it for Jeeps? ...
• Reduction or Elimination of TCM Torque Limiters • Raised Shift Points (Default is 6400-6500rpm, customer can specify custom shift point) • +200 N/m of additional torque allowed in Gear and During Shifts in AutoStick/Manual mode • Modified Line Pressure • Works with aftermarket Valvebody/Driveline + you get through the traps in 3rd. Without this tune our jeeps shift from 3rd-4th right before we cross the line. Yep, let Autostick shift itself. Always took a tenth off my time, if not more.
