Duramax Diesels Forum Truck of the Week
  #1  
Old 04-25-2018, 02:23 PM
dylon333 dylon333 is offline
Gearhead
 
Join Date: Dec 2017
Posts: 92
Default Not your normal shift defuel question

I habe efi live and do my own tuning. But haven't messed with the trans much. Is there a way to turn the defuel up? It used to defuel pretty hard but I put the stock tune in the tcm after making change to some things that didn't work out.
__________________
07 lbz ccsb deleted, intercooler pipe, Rebuilt trans with unknown upgrades (done by P.O.) 4in to 5 in exhaust.
Reply With Quote
  #2  
Old 04-25-2018, 02:37 PM
Chevy1925's Avatar
Chevy1925 Chevy1925 is offline
don't know sh!t about IFS

 
Join Date: Oct 2009
Location: Phoenix Az
Posts: 14,762

Default

im confused on what you are asking. are you trying to get the ecm to pull more fuel as it shifts or not pull as much as it shifts?

What do you shifts feel like now and have you logged the truck currently?
__________________
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
  #3  
Old 04-25-2018, 04:05 PM
1FastBrick 1FastBrick is offline
Hotrodder
 
Join Date: Dec 2016
Location: Junkyard
Posts: 225
Default

Quote:
Originally Posted by Chevy1925 View Post
im confused on what you are asking. are you trying to get the ecm to pull more fuel as it shifts or not pull as much as it shifts?

What do you shifts feel like now and have you logged the truck currently?
How would you do to make it Defuel less so it's not as aggressive?

Would you do the reverse to make it defuel more and make it more aggressive?
Reply With Quote
  #4  
Old 04-25-2018, 04:53 PM
dylon333 dylon333 is offline
Gearhead
 
Join Date: Dec 2017
Posts: 92
Default

Trying to get truck to defuel more. Shifts feel a little soft. Trans is not slipping yet.

Little back story might make things make more sense. The truck was tuned when I bought it. I didn't like the tuning, and had efi live and wanted to play with it myself. Then wanted to try the early lock up tune that's posted on here some where not realizing the trans had been tuned also. Before I played with trans tunes it Defueled so much that it wouldn't hold a burn out through the shift. Which I also didn't like. But now am just trying to make the truck be reliable and last so ideas of what I like have changed.
__________________
07 lbz ccsb deleted, intercooler pipe, Rebuilt trans with unknown upgrades (done by P.O.) 4in to 5 in exhaust.
Reply With Quote
  #5  
Old 04-25-2018, 05:31 PM
Chevy1925's Avatar
Chevy1925 Chevy1925 is offline
don't know sh!t about IFS

 
Join Date: Oct 2009
Location: Phoenix Az
Posts: 14,762

Default

Put a stock trans/stock engine tune in and let the trans learn. It should shift smooth and have no hiccups through the shifts. This is what you want as you build power in. You should by no means be touching the defuel tables unless you absolutely know what you are playing with and have tuning dialed. By the looks of what you have done prior and are playing with now, you still have lots of work in the tuning area.

Good shifts are also dependent on how the tune is built even with stock defuel in place. You can get crap shifts like bad defuel or not enough if the tune is not built well.

I watched a post on facebook blow up cause a dude in a dually couldnít get his truck to spin into 2nd gear as he tried a burnout from a roll. No one had a clue about defuel on there. They all wanted their junk to just spin through the gears. If you donít understand the operation of the trans and how it works, you will never get why defuel must be there. Iím glad you changed your idea of what you want in a burnout lol
__________________
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
  #6  
Old 04-25-2018, 05:55 PM
dylon333 dylon333 is offline
Gearhead
 
Join Date: Dec 2017
Posts: 92
Default

My tunes seem to run great, really clean, 18mpg average on fuel. I just wanted to get that pause between the gears back that was there before. Ha ha not so worried about burnouts either. Building a new house and don't have the time or funds for the truck to be down so thought if the trans De fueled a little more I'd be helping to keep the trans alive
__________________
07 lbz ccsb deleted, intercooler pipe, Rebuilt trans with unknown upgrades (done by P.O.) 4in to 5 in exhaust.
Reply With Quote
  #7  
Old 04-25-2018, 06:18 PM
WVRigrat05's Avatar
WVRigrat05 WVRigrat05 is offline
Wound for sound
 
Join Date: Jan 2011
Location: French Creek, West Virginia
Posts: 3,030

Default

Wtf is a stage one trans?? A shift kit and cheap fluid?
__________________
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
  #8  
Old 04-25-2018, 06:27 PM
dylon333 dylon333 is offline
Gearhead
 
Join Date: Dec 2017
Posts: 92
Default

Forgot to change that as I've been through this already. The trans is supposed to be rebuilt with "better clutches shift kit, bigger converter" per P.o. But the receipt got lost between him showing to me and me taking possession of the truck so I'm not exactly sure what's been done to it

But fixing the signature now
__________________
07 lbz ccsb deleted, intercooler pipe, Rebuilt trans with unknown upgrades (done by P.O.) 4in to 5 in exhaust.
Reply With Quote
  #9  
Old 04-25-2018, 06:34 PM
Chevy1925's Avatar
Chevy1925 Chevy1925 is offline
don't know sh!t about IFS

 
Join Date: Oct 2009
Location: Phoenix Az
Posts: 14,762

Default

Quote:
Originally Posted by dylon333 View Post
My tunes seem to run great, really clean, 18mpg average on fuel. I just wanted to get that pause between the gears back that was there before. Ha ha not so worried about burnouts either. Building a new house and don't have the time or funds for the truck to be down so thought if the trans De fueled a little more I'd be helping to keep the trans alive


I think your splitting hairs. If the shifts are smooth and nothing feels rough or hits into gear, you are on a good road. When you feel that hit, thatís when itís an issue
__________________
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
  #10  
Old 04-25-2018, 07:25 PM
dylon333 dylon333 is offline
Gearhead
 
Join Date: Dec 2017
Posts: 92
Default

Ok I'll leave it alone then I guess. It shifts smooth. No hiccups or anything like that. I'd still like to figure out the trans tuning but there's so little information other then don't do it you'll **** it up. But man the shirts sure seemed more firm like a built trans when I bought it. But he'll maybe there was a problem in the trans tune and that wasn't good
__________________
07 lbz ccsb deleted, intercooler pipe, Rebuilt trans with unknown upgrades (done by P.O.) 4in to 5 in exhaust.
Reply With Quote
  #11  
Old 04-25-2018, 07:27 PM
gmduramax's Avatar
gmduramax gmduramax is offline
Shits broke
 
Join Date: Jun 2008
Location: Nor cal
Posts: 3,052

Default

When all the information says don’t do it you’ll **** it up, probably because you’ll **** it up.
__________________
2008 GMC duramax crew cab short bed 2500.
10.98@124mph

Thanks to Mike L, SoCal Diesel, and Abel Chevorlet.

Tailgate Crew Member #1
Reply With Quote
  #12  
Old 04-25-2018, 07:29 PM
Chevy1925's Avatar
Chevy1925 Chevy1925 is offline
don't know sh!t about IFS

 
Join Date: Oct 2009
Location: Phoenix Az
Posts: 14,762

Default

Quote:
Originally Posted by dylon333 View Post
Ok I'll leave it alone then I guess. It shifts smooth. No hiccups or anything like that. I'd still like to figure out the trans tuning but there's so little information other then don't do it you'll **** it up. But man the shirts sure seemed more firm like a built trans when I bought it. But he'll maybe there was a problem in the trans tune and that wasn't good


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.
__________________
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
  #13  
Old 04-25-2018, 07:31 PM
Mike L.'s Avatar
Mike L. Mike L. is offline
Got Sheep?
 
Join Date: Aug 2006
Location: Disneyland, CA
Posts: 14,730
Default

Firm shifts do not indicate a well built Allison. Forget your daddy's built 400 turbo. We are a lot smarter than that now. Smooth shifts is the new black.
__________________
Shop 714 870 7300
Cell 310 918 9678

Tuned by Idaho Rob.
Reply With Quote
  #14  
Old 04-25-2018, 08:35 PM
gmduramax's Avatar
gmduramax gmduramax is offline
Shits broke
 
Join Date: Jun 2008
Location: Nor cal
Posts: 3,052

Default

Quote:
Originally Posted by Mike L. View Post
Firm shifts do not indicate a well built Allison. Forget your daddy's built 400 turbo. We are a lot smarter than that now. Smooth shifts is the new sheep.
Fixed
__________________
2008 GMC duramax crew cab short bed 2500.
10.98@124mph

Thanks to Mike L, SoCal Diesel, and Abel Chevorlet.

Tailgate Crew Member #1
Reply With Quote
  #15  
Old 04-26-2018, 03:35 AM
dylon333 dylon333 is offline
Gearhead
 
Join Date: Dec 2017
Posts: 92
Default

I come from the Cummins world if your trans is soft you better start pricing a trans haha. As far as learning how the trans tuning works when though everyone says you'll screw it up. I still want to learn how it works. People told me I was stupid for buying efi live and doing my own tuning 5 yrs ago that I should just buy tunes. But here I am have learned a lot about tuning still have plenty to learn but have tuned bunch of trucks with no issue. Kind of same thing on the trans. Even if I don't use it is still like to learn how it works. I've figured out how to change lock up points but that's where I stopped
__________________
07 lbz ccsb deleted, intercooler pipe, Rebuilt trans with unknown upgrades (done by P.O.) 4in to 5 in exhaust.

Last edited by dylon333; 04-26-2018 at 04:47 AM.
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 11:38 AM.


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