Question for the Dyno GURU's - Competition Diesel.Com

DieselAddiction · 02-09-2008, 05:42 PM

Hello,
Have a question for those that dyno a lot. What gears do you use for all the makes when you do a dyno run.
Dodge, chevy, ford, ( 5spd, 6spd, auto,)
Can someone tell me what gear to use to make a dyno run in all these vehicles.

Thanks

rams-n-hogs · 02-09-2008, 06:20 PM

My 96 is always done in 5th, (5-speed), and the 04 is done in D. It doesn't get rolled into until the TC is locked. 6 speeds are usually done in 6th.

Dockboy · 02-09-2008, 06:41 PM

Depends on the type of dyno.

Load dyno, whatever is 1:1

Inertia dyno, overdrive or the highest gear.

DieselAddiction · 02-09-2008, 06:47 PM

Superflow , (so a load dyno)

DieselAddiction · 02-12-2008, 06:46 PM

Anyone??

twinmega06 · 02-12-2008, 07:08 PM

what truck are u going to dyno?

DieselAddiction · 02-12-2008, 07:59 PM

I wanted to help the dyno operator with this info, because he does not deal with diesel trucks. I just wanted to get as close to correct numbers for everyone as possible.
Thanks

WanaDmxsub · 02-12-2008, 09:35 PM

Chevy/GMC, Duramax, Allison, 4th gear for all years. T/H on, OD locked out and use a Tech II or EFILive to select (lock in) 4th gear. Other wise it will shift. It can be done without the TechII/EFILive, but it takes some practice to keep it from down shifting.

CTD03 · 02-13-2008, 08:50 AM

4th in a nv4500

5th in and nv5600

1:1 gears

BgBlDodge · 02-13-2008, 10:57 AM

OD on my auto on a dynojet and 3rd on a mustang.

McRat · 02-13-2008, 11:12 AM

Most all automotive transmissions have a 1:1 ratio, and normally this has the least gear loss. This is 4th on the Dmax Allisons, and 5th on the ZF-6's. Should be 3rd on 4-sp transmissions. Think it's 4th on the Ford 5-sp.

However. Tireslip and spin goes down as MPH goes up. And on inertial dyno's they can't simulate real world engine load, hence can't get the charger to wake up.

I've dyno'd Casper in both 4th and 5th, and there isn't alot of difference on a loadcell like a Superflow. My last pulls were 4th on a Mustang.

We dyno'd Wendy on Monday and did a pull in 5th for a sanity check, and both gears dyno'd the same within 2 rwhp. We did the pulls in the 4th anyhow since we were going to use the numbers publically (533rwhp and flat) later on in a comparison test. Some people think there is a nitrous jet located in the O/D ratios that skews the numbers. I've seen many of these transmissions apart, but cannot find it yet. It must be pretty small, or I need glasses.

DieselAddiction · 02-13-2008, 01:12 PM

Thanks, this is the kind of info I am looking for.

02-09-2008, 05:42 PM	#1
DieselAddiction Name: DieselAddiction Title: Diesel Enthusiast Status: Not Here Join Date: Jun 2007 Location: Western PA Member`s Gallery Posts: 121	Question for the Dyno GURU's Hello, Have a question for those that dyno a lot. What gears do you use for all the makes when you do a dyno run. Dodge, chevy, ford, ( 5spd, 6spd, auto,) Can someone tell me what gear to use to make a dyno run in all these vehicles. Thanks

02-09-2008, 06:20 PM	#2
rams-n-hogs Name: rams-n-hogs Title: Too Much Time Status: Not Here Join Date: May 2007 Location: Wasilla, Ak Member`s Gallery Posts: 257	My 96 is always done in 5th, (5-speed), and the 04 is done in D. It doesn't get rolled into until the TC is locked. 6 speeds are usually done in 6th. __________________ Jim Retired USAF 04 Dodge 2500, Auto 96 Dodge 2500, 5-sp 2012 Ram 3500 dually, 6-sp

02-09-2008, 06:41 PM	#3
Dockboy Name: Dockboy Title: Comps BFF Status: Not Here Join Date: Apr 2006 Member`s Gallery Posts: 3,341	Depends on the type of dyno. Load dyno, whatever is 1:1 Inertia dyno, overdrive or the highest gear. __________________ Greg

02-12-2008, 07:08 PM	#6
twinmega06 Name: twinmega06 Title: master debater Status: Not Here Join Date: Dec 2007 Location: in front of a ford Member`s Gallery Posts: 211	what truck are u going to dyno? __________________ 06 3500 mega cab 4x4 855.1 #2 only 98.5 2500 reg cab 4x4 431 #2 only 02 f-550 7.3 x cab 4x4 02 2500 dmax x cab 4x4 11 4500 6.7 quad cab 4x4

02-12-2008, 09:35 PM	#8
WanaDmxsub Name: WanaDmxsub Title: Diesel Enthusiast Status: Not Here Join Date: Apr 2006 Location: Kalifornia Member`s Gallery Posts: 178	Chevy/GMC, Duramax, Allison, 4th gear for all years. T/H on, OD locked out and use a Tech II or EFILive to select (lock in) 4th gear. Other wise it will shift. It can be done without the TechII/EFILive, but it takes some practice to keep it from down shifting. __________________ '04 C2500HD D/A LS EC SB, Chrome Nerf bars, Grandson's "throne", Prodigy, Weatherflector, Breezer, A.R.E. Z w/accordion boot, Bedrug, H2's, Bilsteins, Predator, VR Straps, Bowtie Flag, Mag-Hytec's, SPA Boost/EGT, Katless 4", BigMouth Grille, SD Manifold, .50 Hot Rod Allison/TTS triple, Airlift Superduty bags, Banks Bighead, Fugly '06 Mirrors

02-09-2008, 06:47 PM	#4
DieselAddiction Name: DieselAddiction Title: Diesel Enthusiast Status: Not Here Join Date: Jun 2007 Location: Western PA Member`s Gallery Posts: 121	Superflow , (so a load dyno)

02-12-2008, 06:46 PM	#5
DieselAddiction Name: DieselAddiction Title: Diesel Enthusiast Status: Not Here Join Date: Jun 2007 Location: Western PA Member`s Gallery Posts: 121	Anyone??

02-12-2008, 07:59 PM	#7
DieselAddiction Name: DieselAddiction Title: Diesel Enthusiast Status: Not Here Join Date: Jun 2007 Location: Western PA Member`s Gallery Posts: 121	I wanted to help the dyno operator with this info, because he does not deal with diesel trucks. I just wanted to get as close to correct numbers for everyone as possible. Thanks

02-13-2008, 08:50 AM	#9
CTD03 Name: CTD03 Title: One Hot 03 Status: Not Here Join Date: Jul 2006 Location: western pa Member`s Gallery Posts: 1,115	4th in a nv4500 5th in and nv5600 1:1 gears __________________ 2003 5speed 62/71/14,wicked cp3, 110s,150injectors,little 392,3850dd valair. need more hp

02-13-2008, 10:57 AM	#10
BgBlDodge Name: BgBlDodge Title: Hates hippies Status: Not Here Join Date: May 2007 Location: Buda, Tx Member`s Gallery Posts: 16,647	OD on my auto on a dynojet and 3rd on a mustang. __________________ 2003 Nissan 350z Touring 6mt 2000 4runner Limited Tyler Williams We have become educated beyond our intelligence. -Jerry Clower

02-13-2008, 11:12 AM	#11
McRat Name: McRat Title: Too Much Time Status: Not Here Join Date: Apr 2006 Member`s Gallery Posts: 1,571	Most all automotive transmissions have a 1:1 ratio, and normally this has the least gear loss. This is 4th on the Dmax Allisons, and 5th on the ZF-6's. Should be 3rd on 4-sp transmissions. Think it's 4th on the Ford 5-sp. However. Tireslip and spin goes down as MPH goes up. And on inertial dyno's they can't simulate real world engine load, hence can't get the charger to wake up. I've dyno'd Casper in both 4th and 5th, and there isn't alot of difference on a loadcell like a Superflow. My last pulls were 4th on a Mustang. We dyno'd Wendy on Monday and did a pull in 5th for a sanity check, and both gears dyno'd the same within 2 rwhp. We did the pulls in the 4th anyhow since we were going to use the numbers publically (533rwhp and flat) later on in a comparison test. Some people think there is a nitrous jet located in the O/D ratios that skews the numbers. I've seen many of these transmissions apart, but cannot find it yet. It must be pretty small, or I need glasses. __________________ Pat McSwain 2007 Kodiak Duramax "Home Base" 2006 GMC 2500HD "Wendy" 12.50@107.44 Tuning+MikeL Trans. 2005 GMC 2500HD "Casper" 197mph+ clocked at Bville. 10.59@130. SuperStreet 3.0 Sledpull winner. Same truck. 2004 GMC 3500 "Big Blue" 13.10@103. Sledpull Winner.

02-13-2008, 01:12 PM	#12
DieselAddiction Name: DieselAddiction Title: Diesel Enthusiast Status: Not Here Join Date: Jun 2007 Location: Western PA Member`s Gallery Posts: 121	Thanks, this is the kind of info I am looking for.