Lousy EFI tuning= bad shifting - Page 3 - Chevy and GMC Duramax Diesel Forum
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Old 02-16-2012, 06:39 PM   eBay Motors  #21 (permalink)
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Originally Posted by xsivspeed454 View Post
When I put the trani back in, I did a clutch relearn with my verus, and was told by my trani guy that it isn't gonna shift 100% until it breaks in a little bit. Which makes perfect sense, but I have probably more like 3500 miles on it come to think of it, not 5000, and it shifts just like I've been explaining. I did get the new tunes installed after I did the trani because now that I got a built trani, I wanted some bigger "built trani" tunes. Since I did that, my shifting has been terrible. I also forgot to add that a buddy of mine has been complaining about his shifting too, and he has a stock alli in his 03 and we got tunes done by the same person. Sounds like the common denominator is the bad tunes for sure.
Ya defiantly tunning. M tranny only acted funny for a day or two.


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Old 02-16-2012, 06:43 PM   eBay Motors  #22 (permalink)
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Yup, Im thinking so too, now that I just put 2 and 2 together about my truck and my buddies trucks both starting to shift funny at about the same time. Thanks for all the info once again guys! Now all I need to do is cross my fingers and hope nothing got frigged up with my allison. With all the abuse guys put these transmissions through day in adn day out, Im pretty sure a few thousand miles of bad tuning won't kill it, but we'll see. My new tunes should be done tomorrow, or early next week so I'll keep you guys posted as to how I make out.
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Old 02-16-2012, 06:49 PM   eBay Motors  #23 (permalink)
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Ya defiantly tunning. M tranny only acted funny for a day or two.


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Yeah, a day or two is max for relearn. It is definately your tuner. I would get my money back!!!
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Old 02-16-2012, 06:53 PM   eBay Motors  #24 (permalink)
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Yeah, a day or two is max for relearn. It is definately your tuner. I would get my money back!!!
I probably could argue it, but the main thing is that I'm getting Robs tuning. Its my own fault for going with someone like I did, but like we all do sometimes, we try to save a few bucks, and it comes back to bite us in the ass. I should have known better but I tried anyway. Shit happens. The guy that did the tuning is the same guy that gonna load Robs tunes for me so I don't want to burn the bridge ya know? He's a good shit, just has some lousy tunes.
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Old 02-21-2012, 06:09 PM   eBay Motors  #25 (permalink)
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Well, got some of Robs tunes installed today and all I can say is WOW! What a difference I performance, and shifting. Thanks for the help guys
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Old 02-21-2012, 07:39 PM   eBay Motors  #26 (permalink)
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No problem! Now you can tell others that Bad tuning will cause your trans to shift like crap!
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Old 11-28-2012, 01:06 PM   eBay Motors  #27 (permalink)
 
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Hey guys wanted to get in on this topic. I recently installed an efi live tunned by Idaho Rob. My question is I know that he is a very reputable tuner however when accelerating my truck has VERY erractic shifting. Is this to protect the stock tranny or whats the deal. For $1,100 I would have expected something alot better.
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Old 11-28-2012, 01:19 PM   eBay Motors  #28 (permalink)
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Originally Posted by lilmick09 View Post
Hey guys wanted to get in on this topic. I recently installed an efi live tunned by Idaho Rob. My question is I know that he is a very reputable tuner however when accelerating my truck has VERY erractic shifting. Is this to protect the stock tranny or whats the deal. For $1,100 I would have expected something alot better.
call dustin (sickdiesel) and take a log so they can look at it.

might just be something that was overlooked
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Old 11-28-2012, 01:23 PM   eBay Motors  #29 (permalink)
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Quote:
Originally Posted by lilmick09 View Post
Hey guys wanted to get in on this topic. I recently installed an efi live tunned by Idaho Rob. My question is I know that he is a very reputable tuner however when accelerating my truck has VERY erractic shifting. Is this to protect the stock tranny or whats the deal. For $1,100 I would have expected something alot better.
A couple quick notes before I attempt to answer you question.

First, have you contacted Rob or ATPTrucks.com? Usually they are the fastest source for good answers and information.

Second, this is an old thread and you may have been better off creating your own thread as opposed to reviving and old thread that wasn't 100% relevant.

To answer your question or attempt to.

The Allison transmission is adaptive and has adaptive learning, so it will learn your driving characteristics. If you have driven around for 60k miles like a grandpa on a stock tune and then throw on a 150hp over stock tune and romp on the throttle; you will find that the transmission won't shift right. You can do a re-learn or just drive around on the tunes for awhile as it learns.

One other note is that the Allison transmission uses a defuel in between shifts, you may also be feeling that.

All of that aside, there could be issues with your truck that are being brought to light such as fuel rail issues. When was the last time you changed your fuel filter? A data log can identify some of the issues, sometimes they aren't as noticeable with stock tuning, but larger tunes bring them to light due to the increased fuel demand.

My suggestion is to contact ATPTrucks.com directly, but you can also answer my questions above and maybe we can get you pointed in the right direction.

Poor tuning CAN cause shifting issues, but I highly doubt that's the situation here.

Have you completed a re-learn? What power level are you driving around at? When do you have erratic shifting? Does this occur when you are getting on the throttle a lot or at all speeds? Can you please elaborate on erratic shifting?
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Old 11-28-2012, 02:34 PM   eBay Motors  #30 (permalink)
 
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Originally Posted by TDFDiesel View Post
A couple quick notes before I attempt to answer you question.

First, have you contacted Rob or ATPTrucks.com? Usually they are the fastest source for good answers and information.

Second, this is an old thread and you may have been better off creating your own thread as opposed to reviving and old thread that wasn't 100% relevant.

To answer your question or attempt to.

The Allison transmission is adaptive and has adaptive learning, so it will learn your driving characteristics. If you have driven around for 60k miles like a grandpa on a stock tune and then throw on a 150hp over stock tune and romp on the throttle; you will find that the transmission won't shift right. You can do a re-learn or just drive around on the tunes for awhile as it learns.

One other note is that the Allison transmission uses a defuel in between shifts, you may also be feeling that.

All of that aside, there could be issues with your truck that are being brought to light such as fuel rail issues. When was the last time you changed your fuel filter? A data log can identify some of the issues, sometimes they aren't as noticeable with stock tuning, but larger tunes bring them to light due to the increased fuel demand.

My suggestion is to contact ATPTrucks.com directly, but you can also answer my questions above and maybe we can get you pointed in the right direction.

Poor tuning CAN cause shifting issues, but I highly doubt that's the situation here.

Have you completed a re-learn? What power level are you driving around at? When do you have erratic shifting? Does this occur when you are getting on the throttle a lot or at all speeds? Can you please elaborate on erratic shifting?
I have not contacted Rob yet as I didn't know if this was gonna be an issue that is common on stock transmissions, didn't wanna waist his time if this was the case. Sorry about posting on an old thread still in the process of learning this forum. I changed the fuel filter a couple of months ago when changing my oil. I change the filter every oil change and as of a couple of days ago installed a new AirDog II 165. I have not completed a re-learn. I mostly drive in economy/street tune which is 60hp over stock. However, when I use position 5 which is the race tune 100hp over stock I have the erratic shifting from 2 gear on. Again thanks for the help and bearing with me through this learning curve.
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