Attention Resident Dyno Expert(s)..... - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by Timbeaux38, this thread has received 26 replies and been viewed 1580 times.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 27 (permalink) Old 06-13-2005, 04:45 PM Thread Starter
 
Join Date: May 2005
Posts: 3,230
Points: 31,219
Thanks: 0
Thanked 0 Times in 0 Posts
Attention Resident Dyno Expert(s).....

I saw this on another forum I want to know how you can "backwards dyno" or is that just on an engine dyno? He also proclaims to be putting 850 to the ground later in the post......



And I do understand how they make 1400 hp, by pulling the motor backwards on the dyno, this is the way a sled puller runs so this is how they dyno them, the same motor on a accelerated dyno pull . meaning the way drag racer pull them would only make in the neighborhood of a 1000 hp , because not only are you giving up using stored energy in the motor , but a over rich, pig fat motor is lazy when you try to make it rev gain. So put you motor in a drag racing type vehicle , and watch the difference .

I wonder if you can guess who said that?
Timbeaux38 is offline  
Sponsored Links
Advertisement
 
post #2 of 27 (permalink) Old 06-13-2005, 09:17 PM
 
Join Date: May 2005
Posts: 1,645
Points: 19,169
Thanks: 0
Thanked 0 Times in 0 Posts
Where did this pipe dream come from??
partsguy662 is offline  
post #3 of 27 (permalink) Old 06-13-2005, 09:53 PM Thread Starter
Threadstarter
 
Join Date: May 2005
Posts: 3,230
Points: 31,219
Thanks: 0
Thanked 0 Times in 0 Posts
You dont wanna know............... Lets just say he is relatively new to the diesel world...
Timbeaux38 is offline  
post #4 of 27 (permalink) Old 06-13-2005, 11:29 PM
 
Join Date: Jun 2005
Posts: 790
Points: 2,183
Thanks: 0
Thanked 0 Times in 0 Posts
OMG!!! what site is that from?


luke
lukecline is offline  
post #5 of 27 (permalink) Old 06-13-2005, 11:39 PM
Senior Member
 
Join Date: Dec 2005
Posts: 4,318
Points: 57,334
Thanks: 2
Thanked 18 Times in 4 Posts
Tim, was that copywrited information?
NMU98 is offline  
post #6 of 27 (permalink) Old 06-14-2005, 01:46 PM Thread Starter
Threadstarter
 
Join Date: May 2005
Posts: 3,230
Points: 31,219
Thanks: 0
Thanked 0 Times in 0 Posts
No B, none of the sort. I was hoping that DavidTD may have some sort of Idea what this fella is talking about. The only way I could see a "backwards dyno" is if you ramp a truck up to say 5k on a loading dyno, then romp on it ? I dunno...makls no sense to me...
Timbeaux38 is offline  
post #7 of 27 (permalink) Old 06-14-2005, 02:25 PM
 
Join Date: Jun 2005
Posts: 447
Points: 1,286
Thanks: 0
Thanked 0 Times in 0 Posts
An interesting theory.....wonder how true it is. Hopefully this spaws some interesting disscussion and not a bash fest.

Slightly OT but who has the fastest time down the 1/4 mile in a diesel powered vehicle? Not interested in a debate about who is lighter or who has more $$$ in it or who will be :blah: Just a simple who is the fastest?

I am truely interested in a disscusion on this, seems alot of good and interesting info could come out if people keep an open mind regardless who is right or wrong. Sounds like an interesting theory but does it hold water??? I duno.

My though right or wrong. Pulling a motor down that hard would definatly load the piss outa a turbo regardless how laggy it is I would think. If you make good power letting it rev free then in a lite vehicle I would say thats a plus to moving down the 1320. yes no???
ratlover is offline  
post #8 of 27 (permalink) Old 06-14-2005, 02:26 PM
 
Join Date: Jun 2005
Posts: 447
Points: 1,286
Thanks: 0
Thanked 0 Times in 0 Posts
ok.....maybe my question about who is the fastest is slightly stiring the pot
ratlover is offline  
post #9 of 27 (permalink) Old 06-14-2005, 02:36 PM Thread Starter
Threadstarter
 
Join Date: May 2005
Posts: 3,230
Points: 31,219
Thanks: 0
Thanked 0 Times in 0 Posts
I could be wrong Ratlover, but to my knowledge Scott Bentz has the fastest pass in a Rail. I dont think it is stirring the pot too much now, but if some more "vocal" members of the diesel internet community show up it could get interesting. I would love to answer the question, but I dont know enough about how you could dyno both bcakwards and forewards...I figure if a motor is under full load at a gfiven RPM it makes the same power no matter if it is coming or going......but i'm no physics guy...
Timbeaux38 is offline  
post #10 of 27 (permalink) Old 06-14-2005, 02:57 PM
 
Join Date: May 2005
Posts: 3,005
Points: 20,858
Thanks: 0
Thanked 2 Times in 1 Post
I think I have a clue here, just a clue. Something an old drag racer from home told me, "Torque motors like to work". The best way I can explain it is by example. Good friend of his was running the same motor Milton was, a 355 small block that was wrap happy as all get out. Well, Miltons' buddy built a 383 stroker for his drag car and put it in. With the same tranny and rear end gears used on the 355 motor his times did not change more than a tenth. He changed the rear end gears from 4.10's to 3.73's. With everything else being equal he picked up another tenth. The only thing he did different was make the motor "load" a bit more, which apparently made the motor happier and let it show it's stuff. Henceforth the phrase "Torque motors like to work".

Clear as mud?
Billysgoat 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



Similar Threads
Thread Thread Starter Forum Replies Last Post
battery replacement (sorry long post) bigastrk 2008-2010 6.4L Power Stroke 5 12-28-2008 01:21 AM
Lost stud & nut from rear hub on rear axle Duke Medium and Heavy Duty 4 09-18-2005 06:31 AM
My truck is back!!! 4cstr 1994-2003 7.3L Power Stroke 2 08-06-2005 07:44 PM

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