13 Charger Daytona (3.92 Getrag & Limp mode)

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tacamo01
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13 Charger Daytona (3.92 Getrag & Limp mode)

Post by tacamo01 »

Can someone help with this issue I have. Not all the time but most of the time if I go WOT from 1st gear, the R/T hits the rev limit and goes into limp mode. I am assuming that the communications between the TCM and PCM is not fast enough for the 3.92 Getrag. However the MOPAR 11's have the same transmission and rear end. I have tried adjusting the engine rev limits to no avail. Arrington tried to program my TCM for higher shift points but that failed also. They are still working the issue.

Anyone know a fix for this problem? If the MOPAR 11's did not have this problem I am thinking there is something I am not looking at. I am at 385 rwhp with the MM Cam in the car. Could this be the problem? More hp than the MOPAR 11 coupled with the 3.92 rear? Any help would be appreciated. :D
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by mikel »

raise the rev limiter a bit more...
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tacamo01
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by tacamo01 »

I currently have the rev limit (engine) set to 6400 rpms with the Trinity. Should I try 6600? I think that is max I could go based on the settings I am seeing.
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by mikel »

when it limps, its because it hits the limiter, so yeah, I'd raise it a bit more.
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by tacamo01 »

I raised it to max of 6600 and tried 4 WOT 1st to 2nd gear. 3 times it was great and one time went into limp mode. It also shutters a bit or hesitates just before going into limp mode. Kind of like it is not getting gas or info and is confused. Could this be a Valve Body issue? I was planning on getting the Paramount Stage 2 next year with the SC but may have to get one sooner if this is the problem.
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by mikel »

what are the shift points set to?
I wonder if they are just set too high.

Is your motor built?
I can raise the limiter a bit if you want, post the last tune written.
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by tacamo01 »

mikel wrote:what are the shift points set to?
I wonder if they are just set too high.

Is your motor built?
I can raise the limiter a bit if you want, post the last tune written.
The motor has a MM Custom Grind and I have the 6.4L intake on the 5.7L. (Very close to SRT dyno numbers) I do not know anything about shift point setting. (Not very good at this tuning stuff, I have Johan doing all my custom tunes and I just use the quick adjust parameters the Trinity has built in) The 13 tunes just came out a few months after I got the Daytona.

Attached is the last tune that Johan sent last month. Maybe there is something that can be done between you and Johan. I did not want to bother Johan again. LOL I promised the next time I was going to need a revision would be with the SC at the end of the summer. I appreciate the help!! :D
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by mikel »

OK, you said arrington tried to raise the shift points in the tcm, what did they set them to?
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by tacamo01 »

Long story short, Jim Walbish at Arrington tried with a new TCM to raise the shift points. AJ knew nothing about it. (He was in NY) After several attempts sending the TCM back and forth, the car would never leave 1st gear and shift into second. A MOPAR 11 guy from Las Vegas tried the same thing but this time AJ got involved but the same problem resulted. The car would not shift out of 1st gear. It most likely has something to do with the TCM/3.92 rear end. Another guy on the LX forum is right now getting his 2013 AWD TCM programmed by AJ for shifts at 6100 rpms. He expects the TCM back this weekend. He has the 3.06 rear.

I hope they come up with a solution for the 3.92 rear gearing/TCM because on my dyno, the hp climbs in a very straight line and then the car wants to shift into 5th gear. The HP never levels out. It has peaked up to 395 rwhp just before the car shifted gears when we tried to test up to 5800 rpms.

For now though I would just be happy to go WOT in first gear from a stop and not go into limp mode! :D
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by mikel »

the rev limiter in that tune is still set to 6100...raise it!
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tacamo01
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by tacamo01 »

If the tune is reading 6100 then that is my problem however I just set the dang thing again yesterday but I have no way of knowing if it is writing this to the PCM. (I changed throttle settings also when adjusting the rev limit) Thanks for looking at it. I am going to return the car to stock and start over loading Johan's tune. Then just the rev limit to 6600 and see if that fixes it. Thanks again and will let you know this PM if it works.
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tacamo01
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by tacamo01 »

Returned to stock and loaded Johan's tune. I just realized that the file I sent yesterday was the one from my computer and not the Trinity. So I transferred the file from the trinity to computer and that is what is attached. If the tune was loaded correctly the rev limit should be set to 6600 rpms. Is that what this file shows? I am also running V.1r1ob with the 1000. I think it was the first update and I never had a problem with this version so I never updated. Am I missing anything new? (If it ain't broke don't fix! LOL)

Anyway it is raining out so I can not go WOT until tomorrow, just wanted to send in this info. Thanks Mike/Johan for your assistance with this!! :)
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by tacamo01 »

Took the car out and it went into limp mode on the first WOT. (1st to 2nd gear) Guess if the modified tune I sent in yesterday has the rev limits reading 6600 rpms I will just have to use the paddle shifters and anticipate the gear changes. :?
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by mikel »

or lower the shift points.

seems to me its shifting too high and hitting the internal TCM limiter at 6750.
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tacamo01
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Re: 13 Charger Daytona (3.92 Getrag & Limp mode)

Post by tacamo01 »

Thanks Mike, took it out and in Drive (Not sport mode) I was able to nail it 4 times at WOT without going into limp mode. That is all I need. Sport mode for some reason went into limp mode. Maybe because it holds the shifts longer.

Quick question. I datalogged these couple of runs, is it OK to have 2-4 short term knock at the beginning of the WOT runs. Just for a few secs if that much and then it drops to Zero fast.
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