Duramax Diesels Forum Truck of the Week
  #16  
Old 04-26-2018, 03:39 AM
monster50iii's Avatar
monster50iii monster50iii is offline
Hotrodder
 
Join Date: Dec 2014
Posts: 164
Default

You are aware how to torque match your tcm torque control table to your pedal torque desired table in the ecm?? Look at how gm did this with the stock tunes and it will make sense, it's really straight forward.

To add more defuel, lower the values slightly in the torque control area in your tcm tune. Example; if your at 1400rpms, 8% pedal, you might be at 200ftlbs. If you go into the fuel rate table 200ftlbs might line up to be 25mm3 at 1400rpms. If you want it to defuel to 15mm3 at this time during a shift, find the torque value that 15mm3 would be and enter it into the correlating matched cell in the tcm tune. All numbers were off the top of head, not actual.
__________________
Love your country, never trust your gov't
Reply With Quote
  #17  
Old 04-26-2018, 04:51 AM
dylon333 dylon333 is offline
Gearhead
 
Join Date: Dec 2017
Posts: 72
Default

Ok. I forgot my computer today. I'll look into this tonight and see what I can figure out. Thanks for the help. Gives me a starting point
__________________
07 lbz ccsb deleted, intercooler pipe, Rebuilt trans with unknown upgrades (done by P.O.) 4in to 5 in exhaust.
Reply With Quote
  #18  
Old 04-26-2018, 11:45 AM
Dozerboy's Avatar
Dozerboy Dozerboy is offline
Hotrodder
 
Join Date: Jun 2009
Location: TX of course
Posts: 3,752

Default

Quote:
Originally Posted by Chevy1925 View Post
The problem is we donít have enough tables to accurately tune the trans for shifts. There is just enough to destroy stuff but not make it work. We are missing ALOT. Most you can do is tune in shift points, make different gear starts and change tc lock up/unlock.


Op Read this post again! It not about learning how to tune the trans or how it works. We donít have the proper tables to be tuning the trans outside shift points etc.

Tuning the engine is a walk in the park compared to the trans. You pretty much canít destroy the engine in the short term by making a mistake. The trans on the other hand you can.

So if you canít pay donít play.


Sent from my iPad using Tapatalk
__________________

06 GMC 2500 CCSB SLT LBZ 4X4





These views expressed on this post are not my own, but rather randomly generated computer gibberish, and in no way should be used to judge the author's IQ or mental health.
Reply With Quote
  #19  
Old 04-26-2018, 02:18 PM
dylon333 dylon333 is offline
Gearhead
 
Join Date: Dec 2017
Posts: 72
Default

I guess what I'm not getting is why the previous trans tune shifted the way it did and it changed soon as I changed the tune. Of course the original tune was locked So I can't read it's it pulled it out but can't get it to open the file says I don't have the permission needed
__________________
07 lbz ccsb deleted, intercooler pipe, Rebuilt trans with unknown upgrades (done by P.O.) 4in to 5 in exhaust.
Reply With Quote
  #20  
Old 04-26-2018, 02:31 PM
Chevy1925's Avatar
Chevy1925 Chevy1925 is offline
don't know sh!t about IFS

 
Join Date: Oct 2009
Location: Phoenix Az
Posts: 14,536

Default

Quote:
Originally Posted by dylon333 View Post
I guess what I'm not getting is why the previous trans tune shifted the way it did and it changed soon as I changed the tune. Of course the original tune was locked So I can't read it's it pulled it out but can't get it to open the file says I don't have the permission needed
i think we all made that pretty clear in here as to the very possible reasons "why". it could be a shit load of different reasons but we wont be able to tell you.

My suggestion to you would be to not ask "why not" when we ask "why" or say not to do something. instead, come back with an idea of what you are trying to accomplish or explain what you are doing and trying to get as an end result. When we say dont do it, start asking if thats due to x causing y to break or another reason. take a little time to think about why we may be saying "no" or "dont" and wrap your head around it. We still may come back with short answers because you still have not done enough research. We dont like spoon feeding answers cause thats not how you learn or remember. We all went down these roads before.

you are working with a completely new platform over the cummins. ive played heavy in both cummins and dmax. Some stuff crosses right over, other stuff, not so much. The trans is something you will not be able to reference too. In stead, i suggest you start reading why we need defuel and get a grasp for it. then understand about how this is a clutch to clutch transmission and what that entails for shifting. then start going deeper and understand what are the toughest shifts to get right regardless of tuning and why. its these understandings that help you become a better tuner. That is assuming you want to "why".
__________________
Quote:
Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
Reply With Quote
  #21  
Old 04-26-2018, 03:40 PM
dylon333 dylon333 is offline
Gearhead
 
Join Date: Dec 2017
Posts: 72
Default

Understand. Honestly thought it was a simple thing to change. You see so many people turning it off or talking about turning it off any ways, that I assumed it was just a normal table but thought maybe I was over looking it. I'll just leave the truck alone and keep driving. Thanks for the help.
__________________
07 lbz ccsb deleted, intercooler pipe, Rebuilt trans with unknown upgrades (done by P.O.) 4in to 5 in exhaust.
Reply With Quote
  #22  
Old 04-26-2018, 04:56 PM
monster50iii's Avatar
monster50iii monster50iii is offline
Hotrodder
 
Join Date: Dec 2014
Posts: 164
Default

I haven't messed with the LBZ much at all, but I assume it is similar to the picky LMM in areas. These guys are correct, we dont have complete access to torque control in the tcm tune. In a perfect world, what I posted above is correct, but in reality it doesnt do what it 'should' do. I learned by accident that by raising the torque based fuel values, I also increased shift defuel by quite a bit. I'm guessing the tcm follows the stock torque based fuel table in some way for defuels, so by raising those values in the ecm tune, you achieve more defuel. If that makes any sense. I dont use this for defuel, but when I discovered it, I thought with enough time, it may be accomplished. So, in short, that may be a way to increase shift defuels through the ecm tune.
__________________
Love your country, never trust your gov't
Reply With Quote
  #23  
Old 04-26-2018, 04:59 PM
WVRigrat05's Avatar
WVRigrat05 WVRigrat05 is offline
Wound for sound
 
Join Date: Jan 2011
Location: French Creek, West Virginia
Posts: 3,030

Default

I’d have the defuel shut off and tune it like a quadzilla so the throttle flares when it shifts and let the good times roll. I’d shut off pilot injection too so it sounds more like a real diesel too.
__________________
Reger
05' Black Chevy CC/SB LT- Blackout Performance built motor/trans/tuning- Gone

The Blessed Hellride- 08' White GMC Sierra SLT CC/SB,
100k miles. Piston eater.

Wife's ride- 2016 Pearl white Legacy limited 3.6R

Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
Reply With Quote
  #24  
Old 04-26-2018, 06:47 PM
Dozerboy's Avatar
Dozerboy Dozerboy is offline
Hotrodder
 
Join Date: Jun 2009
Location: TX of course
Posts: 3,752

Default

Quote:
Originally Posted by dylon333 View Post
Understand. Honestly thought it was a simple thing to change. You see so many people turning it off or talking about turning it off any ways, that I assumed it was just a normal table but thought maybe I was over looking it. I'll just leave the truck alone and keep driving. Thanks for the help.
IMO Most people don't know what they are talking about.

Sent from my SAMSUNG-SM-G900A using Tapatalk
__________________

06 GMC 2500 CCSB SLT LBZ 4X4





These views expressed on this post are not my own, but rather randomly generated computer gibberish, and in no way should be used to judge the author's IQ or mental health.
Reply With Quote
  #25  
Old 04-27-2018, 02:48 AM
Ridin'GMC's Avatar
Ridin'GMC Ridin'GMC is offline
I like red
 
Join Date: May 2010
Location: MA
Posts: 590
Default

When I first bought my red truck, it had a DSP5 tune in it, ran like crap and acted like it have very little to no defuel. Everytime I drive at a slow speed, it would actually bang from 1st to 2nd. I knew it was a tuning issue, not a transmission issue. What I did was changed it to a single tune with my own tuning and left the defuel alone. Drive it for a week normally and agressive at whenever I get on the highway. Then drove in tow/haul for a week with my normal driving routine from work and back. The issue improved drastically and shifted much better. Sometimes you have to stop changing the tunes so many times, it'll have the transmission confused and keep making adjustments to the point where you'll think there's something wrong. My truck had 160k on the clock when I picked it up. Now it has 190k and it shifts flawless besides the occasional torque converter shudder from getting on it too hard. Personally, I feel stock defuel is the best, the only thing you'll need to do is change the shift points.
__________________
07 LBZ CCSB

RIP 4/1/17
06 LLY CCSB
Reply With Quote
  #26  
Old 04-27-2018, 07:03 AM
Dozerboy's Avatar
Dozerboy Dozerboy is offline
Hotrodder
 
Join Date: Jun 2009
Location: TX of course
Posts: 3,752

Default

Good point switch tunes a lot will make the trans very confused and not shits well. It will cause more wear too


Sent from my iPad using Tapatalk
__________________

06 GMC 2500 CCSB SLT LBZ 4X4





These views expressed on this post are not my own, but rather randomly generated computer gibberish, and in no way should be used to judge the author's IQ or mental health.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -7. The time now is 10:26 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
vB.Sponsors