U7137 TCM IMPROVEMENTS NEEDED

[need-a-cage]

The truck is upshifting pretty well now with the latest CROM, but there still needs to be work done in the downshifting department.

My biggest complaint is that if I am cruising at 30mph and then slow to 15mph for a turn and then roll on the gas after the corner, the truck stays in 3rd gear and just slips the hell out of the torque converter. It NEEDS to downshift to 2nd. Third gear is way too tall to stay in under 20 mph when trying to accelerate. I rolled on it quite a bit and probably got to 1/2 throttle and it still didn't downshift. This makes the truck feel so sluggish. I rolled on it a little around 15mph and then manually put it in 2nd and it downshifted and felt MUCH better.

If it is based on load, then the truck needs to downshift at a lighter load. It should not take so much throttle to get the truck to downshift into 2nd. The same is true for downshifting to 1st as well. I need to do more testing to map this out better, but it seems like it does not want to downshift into 1st even at sub 10mph speeds unless you give it A LOT of throttle. This causes you to keep giving it more and more gas to take off a little faster. It continues to bog until it finally downshifts and then takes off fast than you wanted to. If the downshift is based on speed, then increase the speed that it will downshift at under light load. If it is based on throttle position, then decrease the point at which it will downshift. This will make the truck much more responsive in town and is probably what most people coming from SC complain about with the Diablo.

I would also like a firmer and quicker WOT downshift to 1st when flooring it from 20-30mph. Currently it doesn't feel much different than stock.

Are you guys still working on TCM improvements?

Thanks,
Craig

[Speed1B]

I agree 100%

[~RAM~]

Would be nice to get rid of the mush.

[~RAM~]

Would be nice to get rid of the mush.

[need-a-cage]

Yes, this thing is pretty rediculous. 2nd gear can go 80mph and this thing wants to keep it in 3rd all the way down to 15mph even with 1/2 throttle up a hill! This is one reason why my mileage is so bad. My daily commute includes a few of these conditions where it is eating up fuel and heating the hell out of the torque converter by keeping it in 3rd. I was wondering why it felt so bad coming out of a corner up a steep grade from my daughter's school at only 15-20mph. Then yesterday I manually shifted it to 2nd after I went around the corner up the grade and it downshifted. I couldn't believe that it was trying to keep it in 3rd. That is waisting a lot of power being in a gear that would probably be around 500rpm if the converter was locked and then slipping it at 2500rpm. The rpm doesn't even change when I downshift, it still has the converter slipping at 2500rpm since 2nd gear is also such a high gear, but the truck will actually take off in 2nd instead of just sitting there bogging like crazy.

Please fix this.

Thanks,
Craig

[Harmwalker]

I AGREE. IF THIS COULD BE FIXED IT WOULD BE MUCH APPRECIATED. I HAVE THAT SAME PROBLEM WHEN I'M DRIVING UP THE SIDE OF A MOUNTAIN GOING UP SWITCH-BACKS UP HERE IN ALASKA. NOT TO KEEN ON COMING AROUND A CORNER GOING UP THAT HILL IN 3RD AND HAVING IT DROP HARD AND FAST INTO 2ND AND PUTTING MY BALLS IN MY THROAT BY JUST GIVING IT A LITTLE MORE THROTTLE.

[gomangohemi]

X2

Mine up shifts way too quick, then wants to stay there. I'm driving along @ 35-40 mph and the truck is in 5th, give it a little throttle and it downshifts in 2nd. its ridiculous.

[DiabloFan]

Any official word on a fix for this?

[mikel]

Any official word on a fix for this?

We are certainly looking into this.

[DiabloFan]

Thanks Mike. I have a cam install that is imminent, but I don't want to pay for a custom tune until the tcm is tweaked just a little more.

The engine side of things rules!

[need-a-cage]

I just ran across the below message on the Hemi Truck Forum. I sure hope you guys get the TCM set up as good as Superchips has it. I only have a few mods so my main reason for getting the tuner was to get improved shifting. I am not happy to see someone that wants to go back to SC from Diablo because it shifted better with SC. Did I buy the wrong tuner? I'll give you guys time, but please don't give up on us. If you fix my issue in this post it will make it much better.

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"I am willing to trade my Diablo Predator to someone for a Superchips Flashpaq + $50.

I'm getting good power results from the Diablo, but S/C simply is better with the TCM at the moment.

If you want to really tune in your truck S/C cannot touch Diablo though. Diablo has the engine tuning down pat. Gotta love the fuel and timing controls... Plus the datalogger is SWEET!

My truck is nearly stock and I don't need many features... My truck just responded somewhat better transmission wise with a Superchips."

[mikel]

I saw that.

We are working on this for you guys, please be patient.

[need-a-cage]

Sounds good. I was going to start a new post about a bug that I had. After updating the crom to 9t02f and again when I updated it to 9r02, my shift point change did not take affect on the first download. I will have to make sure that I didn't hit escape at the wrong time, but I know I hit enter and said yes, I want this change to take affect. I drove the truck and my shift points were stock. I went back to reinstall the tune and the shift points did not have the * next to them showing that I modified them. I went in there and they were still 5600. I changed them again, reloaded the tune, and they changed this time. So, it appeared to take 2 downloads to get the shift points changed. I did not notice this issue with the 9t02d crom and I changed them a couple times with that crom. It appeared to work every time before and I think I am doing the same steps.

I am not giving up on you. I just want to keep putting the pressure on and hope that others chime in so you guys will get support to work on these things for us. This issue with the downshifts is in the stock tune, so it is not like it is worse with the Diablo. However, you guys have the power to make it so much better so I am hopeful that the future will just keep getting brighter for my Diablo'd Hemi. Keep the updates coming.

I think on my next tank though I need to turn MDS back on and see if I can get over 10mpg. I am under 1/4 tank now and only at 215 miles. 70% city and a lot of WOT = very poor mileage

Thanks,
Craig

[ElectricBlueHemi]

Hey guys, I've got a CMR tune from Hemifever and my trans tuning he did makes my truck feel so much better. Part throttle upshifting is much improved, downshifting is much easier, and the 3rd gear bog when at low speeds has gone away since the tune.

I have a question for Mike or Jaohan; what are the differences between the 05-06 rams and the 07-08 rams as far as trans functions or tuning? It seems the 07-08 guys have it better as far as trans tuning with Diablo. A little info would be much appreciated for myself and the many ram owners with 05-06 trucks. Thanks.

[Speed1B]

Anything new here?