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  #49  
Old 10-01-2014, 11:29 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

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Originally Posted by dom42 View Post
I am going to very soon. Been very busy. Its sad when my cummins gets 5mpg with in range of the JGC mpgs driving around town . And my Cummins done the F up one of a kind. All kinds of weight blah blah. .

I did do 300 miles of highway and got 30ish mpgs. But it lost it on the hills. Bet they do a big recall on tranny in say 2-4 year.
My duramax got 19 city and 26hwy (not close to stock) if it's gonna get the same mpg I'd rather have something that can tow 25k and has a bed.

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  #50  
Old 10-02-2014, 07:32 AM
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Re: Newest TCM flash. Don't get it if you're not having issues

I had mine in for its first oil change a month ago and they did a bunch of updates. I'm still getting an average of 24-26 mpg and low 30's highway. I live in northern NJ where it's mountainous so lot's of hills to climb.
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  #51  
Old 10-02-2014, 10:29 AM
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Originally Posted by 2009RavenR1 View Post
Close.. sorry still getting emails so I came back to tie up some loose ends.

The TCM is requesting tq reduction. The ecm does this by reducing pulse width.

It is 100% the newest tcm flash. And my fuel economy is horrible now. Down to 23 mpg average with 90% of my driving done 50-65 mph. Confirmed via hand calced numbers. The constant down shifts are murdering economy
For giggles can you manually upshift with the paddle shifters as an override? I haven't played much with them. Wondering if you go into manual if you can force it to stay in the upper gears Just a thought.
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  #52  
Old 10-02-2014, 10:52 AM
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Re: Newest TCM flash. Don't get it if you're not having issues

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Originally Posted by mazster43 View Post
For giggles can you manually upshift with the paddle shifters as an override? I haven't played much with them. Wondering if you go into manual if you can force it to stay in the upper gears Just a thought.
I played with it. It will still upshift but seems like it's triggered by a minimum rpm per gear. I think it would hold a gear unless you slow down. I'll test it this afternoon.

Ok...just tested it. Paddle shifted, 8th gear downshifts at 75% throttle at 65 mph. In Automatic, it downshifts much sooner. Turn ECO off, even sooner.

Above 60 mph, 7th gear will hold at WOT with no downshift in manual.
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  #53  
Old 10-04-2014, 01:45 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

I have noticed no reduction in mileage since having the TCM flashed. It's getting about the exact same as before. It shifts SOOOOO much better in my opinion. During normal acceleration with ECO on, it used to hang high in 1st then rapidly shift from second thru 5th or 6th. Now the shifts are much more evenly spread out. It now shifts between 1600 and 1800 under normal acceleration. Huge improvement. It also used to have a hesitation when you first stepped on the throttle. It drove my wife and I nuts. It seems to be gone now after the TCM update.

In my opinion raising the shift rpm (normal acceleration) slightly above the peak engine torque rpm is a good idea. It should not cause worse fuel mileage. BSFC (brake specific fuel consumption) is typically best where the HP curve and the torque curve cross on a graph, which is above the engine's peak torque RPM.
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  #54  
Old 10-06-2014, 06:47 AM
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Re: Newest TCM flash. Don't get it if you're not having issues

Does the vehicle feel more peppy with the update on the shift changes?

And will this new update come out of the factory going forward does anyone know?
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  #55  
Old 10-06-2014, 06:50 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

Fishbites (shudder) returned today. Just like before....a quick continuous pulsation/oscillation going into 6th gear at 1800 rpm at light throttle. Backing off immediately then adding throttle to the same amount caused oscillation (shudder) again. Applying more throttle accelerated the vehicle and raised RPMs enough to make it stop. This occured after the vehicle sat for an hour and only on the first pass through the gears shifting 5th to 6th....just like before. Never happens again until a restart.

Yes, I have the latest TSB applied.
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  #56  
Old 10-24-2014, 02:09 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

This thread is a re-occurring theme, on every diesel forum for the last 20 years. US auto makers are either clueless, or unwilling to spend the money, to built a real "diesel" transmission. (Yes I know ZF is German, but I bet the bean counters are in Detriot). Just about every diesel model from every manufacturer has had transmission problems and in particular TC problems. Jeep will NEVER fix this problem. That would cost money. Only good solution is the aftermarket. That's why there is a whole industry built around aftermarket diesel pickup transmissions. I hope that EFI will have transmission files when it comes out. Then we can tune our own transmissions to like shift like it should and not like the mall terrain, soccer moms out there want it to. It will still likely need hardware up grades to make it work correctly. Sad but true. If someone is willing, they might want to give Ron at Sun Coast a call and see what they would be willing to do.
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  #57  
Old 10-24-2014, 02:17 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

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Originally Posted by Tinman2 View Post
This thread is a re-occurring theme, on every diesel forum for the last 20 years. US auto makers are either clueless, or unwilling to spend the money, to built a real "diesel" transmission. (Yes I know ZF is German, but I bet the bean counters are in Detriot). Just about every diesel model from every manufacturer has had transmission problems and in particular TC problems. Jeep will NEVER fix this problem. That would cost money. Only good solution is the aftermarket. That's why there is a whole industry built around aftermarket diesel pickup transmissions. I hope that EFI will have transmission files when it comes out. Then we can tune our own transmissions to like shift like it should and not like the mall terrain, soccer moms out there want it to. It will still likely need hardware up grades to make it work correctly. Sad but true. If someone is willing, they might want to give Ron at Sun Coast a call and see what they would be willing to do.
all modern diesel transmissions do fine at stock power levels.
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  #58  
Old 10-24-2014, 06:22 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

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Originally Posted by 2009RavenR1 View Post
all modern diesel transmissions do fine at stock power levels.
...and if not towing up long grades with your foot on the floor.

I agree that a tuner will kill a stock transmission in short order if it's on the hairy edge of being stout enough. The 8HP70 isn't weak...but Jeeps programming skills sure are!
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  #59  
Old 12-16-2015, 12:36 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

I couldn't figure out what happened because I did other mods at the same time. I now notice a decrease in low end torque. My MPG went from 25-26 to 20-21.
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