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View Full Version : Need to hold 4th gear for dyno


samdweezel05
July 20th, 2008, 01:14 AM
One of the things I will be using my EFI live for when it gets here is to hold my truck in 4 gear so I can run it on the dyno a little better. I have a 5 speed allison. Is this hard to do?

Phil
Sparky8370
July 20th, 2008, 12:58 PM
Open up the scantool and connect it to your truck. You will find the Allison DVT in there and you can hold any gear you want.
samdweezel05
July 21st, 2008, 09:55 AM
Almost sounds too easy. Now I can't wait untill it gets here. Thank's

Phil
samdweezel05
July 29th, 2008, 10:03 AM
I have found the DVT section and activated it and it still will not hold the truck in any gear other than 1st. As soon as I click on second it will shift and then keep shifting through all the gears. Am I doing something wrong?

Phil
GMPX
July 29th, 2008, 01:31 PM
There is some RPM limiters in the tune that will stop the gear overrides, or does it feel like it's doing nothing at all?

Cheers,
Ross
samdweezel05
July 30th, 2008, 03:41 AM
It held first gear as far a I felt like pushing it then I clicked second gear and it started shifting through the gears like my laptop wasn't even in the truck. I was not driving it hard at all so it never saw any real high RPM's except for first gear and that was only 3000 or so. I was running a race tune when I did it.

Phil
GMPX
July 30th, 2008, 09:43 AM
See if it corrosponds to these setting in the tuning tool, this is when it will ignore the DVT's.

{D5040} Bidi Control Disable, 1st Gear 1800 RPM
{D5041} Bidi Control Disable, 2nd Gear 2100 RPM
{D5042} Bidi Control Disable, 3rd Gear 3657 RPM
{D5043} Bidi Control Disable, 4th Gear 4000 RPM
{D5044} Bidi Control Disable, 5th Gear 4000 RPM
{D5045} Bidi Control Disable, 6th Gear 4000 RPM
samdweezel05
August 24th, 2008, 07:16 AM
I don't have D5040 or D5041 I do have the rest of them. If I up the values to higher than I will run the truck should it work to hold 4th gear. I have to be at the dyno tomorow at 2:00. I havn't had time to try this. Thank's

Phil
GMPX
August 24th, 2008, 09:23 AM
Phil,

Not sure why you can't see the other parameters, however, what you can simply do on the dyno is run the truck up 1st through to 3rd then activate the 4th gear hold once it's up to speed.

Cheers,
Ross
samdweezel05
August 26th, 2008, 09:46 AM
It worked pretty good but is there a reason it will not hold it from shifting into 5th gear. I just turned the OD off and worked just like I wanted it to. Is there a way I can hold 4th gear with out truning the OD off or should I be happy with what I have. Thank's for the help guys.

Phil
GMPX
August 26th, 2008, 10:01 AM
Unless you went over 4000 RPM then you should be able to hold it in 4th as long as you want.
Cougar281
August 27th, 2008, 12:05 AM
Phil,

Not sure why you can't see the other parameters, however, what you can simply do on the dyno is run the truck up 1st through to 3rd then activate the 4th gear hold once it's up to speed.

Cheers,
Ross

Just an FYI, I don't have D5040 or D5041 either, and I'm on the latest build.
GMPX
August 27th, 2008, 09:24 AM
Right :unsure:
samdweezel05
September 2nd, 2008, 10:29 AM
Unless you went over 4000 RPM then you should be able to hold it in 4th as long as you want.

No sir. All my runs were only to 3500 RPM's. It would shift just like normal if I didn't have the OD button on. Thank's for the help. I too am running the newest version.

Phil
TurboCamaro
December 28th, 2010, 02:19 PM
I had an 08 LMM with Allison 6 spd on the dyne today and am having the same problems. I do not have any of B5040 to 45. I did not try OD button. I found the most effective was to manually shift, with DVT, to 4th then lock the TCC but it still was shifting at 3200 (dropping to 2400). Then at 2700 it started dropping RPM again although gradually like the converter is locking and unlocking through the gear changes. Is there a way to have the trans stay in direct with the converter locked.
cook
December 29th, 2010, 03:36 PM
max out D5003
max out D5023
max out D5028
that should do the trick if you need any more help let me know, Loren
TurboCamaro
December 29th, 2010, 04:16 PM
So the only way to holdva gear is by flashing the PCM. The Bidi won't hold it?
cook
December 29th, 2010, 04:36 PM
this is the only way that i have tried and can honestly say works , just a couple of minutes to flash in and a couple minutes to reflash in your regular tcm tune,Loren
TurboCamaro
December 30th, 2010, 03:43 AM
It would sure be nice to use BIDI in the scanner!
bballer182
December 30th, 2010, 02:51 PM
yeah the dvt's dont work like they should... i had o make a dyno tune and flash
killerbee
January 6th, 2011, 09:58 AM
yeah the dvt's dont work like they should

Same here. Does anyone know for sure what the last update was where they were functional? I would like to have them work from time to time, and I have a spare laptop.
bballer182
January 6th, 2011, 01:46 PM
I don't know for sure. I think it's pretty much a lost cause. Cummins is on the horizon...
dansdieselp
January 11th, 2011, 11:14 AM
I just flash a 4th gear TCC locked in tow haul tune in when on the dyno.
Dozerboy
January 15th, 2011, 04:26 PM
I think it's pretty much a lost cause. Cummins is on the horizon...

No kidding
Madspeed
July 1st, 2011, 12:54 PM
I as well cant hold into 4th on the dyno. I have an LB7 so what gives? I want to click the button in EFI Live that I paid over 900 for and 5 other lic and have it work