Putting an automatic on a dyno - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by Thrillbilly, this thread has received 7 replies and been viewed 978 times.

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 01-15-2008, 08:32 PM Thread Starter
Junior Member
 
Join Date: Sep 2007
Posts: 29
Points: 254
Thanks: 0
Thanked 0 Times in 0 Posts
Putting an automatic on a dyno

Hey guys i got a question about putting my truck on a dyno. We have one at school and my teacher says that i can not put my f-250 6.0 with an automatic on it because i cant keep it in the 1:1 ratio. I know it has to be possible and thinking my teacher is just blowing smoke up my you know what. My question is how do you go about doing it?
Thrillbilly is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 01-17-2008, 12:07 AM
MAFIA #8
 
hhrecovery's Avatar
 
Join Date: Dec 2008
Location: Pulaski, VA
Posts: 5,567
Points: 88,897
Thanks: 104
Thanked 223 Times in 209 Posts
Images: 1
Garage
you need a SCT tune that will keep it locked in the correct gear... he is correct otherwise

Aaron - 2004 F350 "Offroad Edition"

2003 F250 "Pulling Truck"
hhrecovery is offline  
post #3 of 8 (permalink) Old 01-19-2008, 09:42 PM
Countryboy Mechanic
 
Join Date: Jan 2008
Posts: 8
Points: 1,147
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via Yahoo to bigcountrysg
It can be done. But it will not be accurate. Just like my 2002 7.3L today. Which I just ran in second gear. I did this by putting the gear shifter in second. It started out in 1st. But then shift, then I brought the rpms up to 2,000 rpms. Then ran wide open throttle, which gave a reading but it was low compared to other trucks that have the same mods I have. Doing this will only let the truck shift to second and stay there for the run.
bigcountrysg is offline  
post #4 of 8 (permalink) Old 01-20-2008, 01:34 PM
Member
 
Cooper443irty's Avatar
 
Join Date: Dec 2008
Posts: 201
Points: 29,997
Thanks: 6
Thanked 5 Times in 4 Posts
So most auto trucks put on a dyno have a special tune?
Cooper443irty is offline  
post #5 of 8 (permalink) Old 01-22-2008, 06:51 PM
Slow 6.0
 
Join Date: Dec 2008
Location: Salem, NH
Posts: 1,554
Points: 42,386
Thanks: 30
Thanked 59 Times in 46 Posts
Quote:
Originally Posted by bigcountrysg
It can be done. But it will not be accurate. Just like my 2002 7.3L today. Which I just ran in second gear. I did this by putting the gear shifter in second. It started out in 1st. But then shift, then I brought the rpms up to 2,000 rpms. Then ran wide open throttle, which gave a reading but it was low compared to other trucks that have the same mods I have. Doing this will only let the truck shift to second and stay there for the run.
why would u do that when u can leave the truck in OD ad mash the throttle at any speed over 2100rpms and it wont downshift, same thing in 3rd if u use the OD cancel button, bring it up to 2100rpms and floor it it will stay in third. both was keeps the converter lockd up to

2006 F350 XLT 4x4
ARP Studs, Blocked EGR Cooler, MBRP 304SS Cool Duals, 03 Turbo, Coolant Filter Kit, PCM Flashed Back & Innovative Extreme Tunes - 13.3 @ 99
SICKS-O is offline  
post #6 of 8 (permalink) Old 01-23-2008, 04:50 AM
Countryboy Mechanic
 
Join Date: Jan 2008
Posts: 8
Points: 1,147
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via Yahoo to bigcountrysg
Quote:
Originally Posted by Power Stroke
why would u do that when u can leave the truck in OD ad mash the throttle at any speed over 2100rpms and it wont downshift, same thing in 3rd if u use the OD cancel button, bring it up to 2100rpms and floor it it will stay in third. both was keeps the converter lockd up to

It was not me, the dyno operator didn't want me driving on the dyno. He wanted to lock it into a gear from dead stop. Which unless you have a computer for diagnostics to do so for testing. I know no other way that was going to please him.
bigcountrysg is offline  
post #7 of 8 (permalink) Old 02-05-2008, 08:41 PM
DPM Mobile Dyno
 
Join Date: May 2005
Posts: 508
Points: 5,452
Thanks: 1
Thanked 8 Times in 3 Posts
Auto's are fine on the dyno. If you are running on a DynoJet 248 like mine, you want to run it in top gear. The only times I don't use top gear are 6th in a Duramax (use 5th) and sometimes if tires are huge. If you are loading, then you want 1 to 1.

A dyno jet measures HP so gearing doesn't matter. You pick the top gear for the most load.

David Dunbar
www.runNADM.com
www.DieselPerformanceMotorsports.com
2004.5 Dodge 3500 Laramie 4x4 48re
1998 Dodge 2500 QC 4x4 12v 47re

Power by Garmon - to the ground by Sun Coast = 12's :Thumbup:
DavidTD is offline  
post #8 of 8 (permalink) Old 02-22-2008, 04:04 PM
 
Join Date: Feb 2008
Posts: 8
Points: 1,110
Thanks: 0
Thanked 0 Times in 0 Posts
Dave's right, you don't need a special tune to put an automatic on the dyno. Not one like his anyway, because the converter will lock itself after you get past approximately 70mph. After that you can punch it and you got no worries. I don't know squat about load-dynos so I can't help you there
24v 4x4 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Truck Forum - TheDieselGarage.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome