General Diesel Discussion Talk about general diesel engines (theory, etc.) If it's about diesel, and it doesn't fit anywhere else, then put it right in here.
Sponsored by:
Sponsored by:

Cummins out towing a Dmax vid.......

Old 07-31-2009, 11:42 PM
  #1  
Registered User
Thread Starter
 
pwrtripls1's Avatar
 
Join Date: May 2005
Location: Katy, TX off north Mason Road.
Posts: 2,088
Likes: 0
Received 0 Likes on 0 Posts
Cummins out towing a Dmax vid.......

I picked this up on another forum I'm on and couldn't resist, even if it means I'm picking on myself a little. lol

Enjoy the pulling power of the cummins vs. Dmax. Also the retardedness of the Dmax owner. Seems most guys I talk to on the Dmax forums have a firm view that your engine coolant temp has nothing to do with your EGT's. A stock LLY Dmax WILL run 1300-1350* pre turbo with a lot of throttle. I.E. a heavy load uphill. Well when you run 1300-1350* EGT's for 5-10 minutes strait then yes you are going to overheat like crazy. You MUST have a better intake, especialy for an LLY Dmax, and a free flowing exhaust. Then with 1050-1100* EGT's overheating shouldnt be an issue. Well most of those guys think I'm crazy and you should be able to run 1350* all day and not get hot.

http://videos.streetfire.net/video/L...htm#commentTop
pwrtripls1 is offline  
Old 08-01-2009, 12:00 AM
  #2  
Registered User
 
Join Date: May 2008
Posts: 266
Likes: 0
Received 0 Likes on 0 Posts
HAHA, The D-max will make power I dont deny that, but I've known all along using that power was the challenge! I don't feel bad for him, he bought a grocery getter and thinks its a work truck.
DS79
deerslayer1979 is offline  
Old 08-01-2009, 12:21 AM
  #3  
Registered User
 
peobryant's Avatar
 
Join Date: Jul 2008
Location: Goshen, Ky
Posts: 1,506
Likes: 0
Received 0 Likes on 0 Posts
Seen this video a long time ago. There have been a few threads about it, but I think they were all closed.

I still wish it was an old 1st Gen that he couldn't keep up with.
peobryant is offline  
Old 08-01-2009, 12:49 AM
  #4  
Registered User
 
TexasCTD's Avatar
 
Join Date: Nov 2004
Location: McKinney, TX
Posts: 5,680
Likes: 0
Received 0 Likes on 0 Posts
https://www.dieseltruckresource.com/....html?t=132131


This is old news. TXChristopher joined DTR and made some comments here on this thread listed above. He is the guy talking in the video. I believe he sued GM and won and used this video in court.

..
TexasCTD is offline  
Old 08-01-2009, 06:05 AM
  #5  
Registered User
 
Join Date: Oct 2002
Location: Tomball, Texas
Posts: 7,543
Likes: 0
Received 3 Likes on 3 Posts
Yep, Chris won the lawsuit against GM.

The issue was do to with the Duramax cooling system, not EGTs. Would overheat during towing and go into limp mode. A poor design for that model version cause airflow issues though the cooling stack up.

I tow over that same stretch of highway and my Cummins would get to around 210-215 degrees during the summer.

MikeyB
MikeyB is offline  
Old 08-01-2009, 02:06 PM
  #6  
Registered User
Thread Starter
 
pwrtripls1's Avatar
 
Join Date: May 2005
Location: Katy, TX off north Mason Road.
Posts: 2,088
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by TexasCTD View Post
https://www.dieseltruckresource.com/....html?t=132131


This is old news. TXChristopher joined DTR and made some comments here on this thread listed above. He is the guy talking in the video. I believe he sued GM and won and used this video in court.

..
I guess I'm a little slow. lol I still wish he had a pyro to see how high the EGT's were while pulling stock. These LLY's have a tiny turbo inlet pipe. The turbo intake pipe gets choked down to a bent 2.5". How is a 300+hp turbo diesel supposed to breath and keep EGT's down while trying to suck through a tiny 2.5" hole?

I'm no mechanical engineer but you would think that would starve the engine of air. Which in turn would make the VVT close the vanes more trying to build more boost and get more air into the engine. But without being able to draw more air in the vanes closing would only create more back pressure, more heat, and higher EGT's. I wonder if anyone has ever put a good flowing LBZ turbo inlet and a cold air intake or an aftermarket non VVT on an LLY and overheated it.
pwrtripls1 is offline  
Old 08-01-2009, 02:28 PM
  #7  
Registered User
 
rich's Avatar
 
Join Date: Aug 2002
Location: Kerrville eastern new mexico, west texas
Posts: 3,308
Likes: 0
Received 0 Likes on 0 Posts
i run that stretch all the time never see over 210 towing 18k
rich is offline  
Old 08-02-2009, 10:57 AM
  #8  
Registered User
Thread Starter
 
pwrtripls1's Avatar
 
Join Date: May 2005
Location: Katy, TX off north Mason Road.
Posts: 2,088
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by rich View Post
i run that stretch all the time never see over 210 towing 18k
Wow, you go thru trucks pretty fast. Were they all minor problems like pumps when they quit or were they catastrofic failure?
pwrtripls1 is offline  
Old 08-03-2009, 12:43 PM
  #9  
Registered User
 
rich's Avatar
 
Join Date: Aug 2002
Location: Kerrville eastern new mexico, west texas
Posts: 3,308
Likes: 0
Received 0 Likes on 0 Posts
no most of them just wear out the 03 and 07 where the ones with engine problems mainly caused by the injectors
rich is offline  
Old 08-05-2009, 12:50 PM
  #10  
Registered User
 
1slo_MM's Avatar
 
Join Date: Feb 2007
Location: Duluth, MN
Posts: 192
Likes: 0
Received 0 Likes on 0 Posts
Wow I think thats hilarious!!!
1slo_MM is offline  
Old 08-05-2009, 02:52 PM
  #11  
Chapter President
 
Lil Dog's Avatar
 
Join Date: Feb 2002
Location: Red Deer, Alberta Canada
Posts: 6,102
Received 1 Like on 1 Post
Originally Posted by pwrtripls1 View Post
I guess I'm a little slow. lol I still wish he had a pyro to see how high the EGT's were while pulling stock. These LLY's have a tiny turbo inlet pipe. The turbo intake pipe gets choked down to a bent 2.5". How is a 300+hp turbo diesel supposed to breath and keep EGT's down while trying to suck through a tiny 2.5" hole?

I'm no mechanical engineer but you would think that would starve the engine of air. Which in turn would make the VVT close the vanes more trying to build more boost and get more air into the engine. But without being able to draw more air in the vanes closing would only create more back pressure, more heat, and higher EGT's. I wonder if anyone has ever put a good flowing LBZ turbo inlet and a cold air intake or an aftermarket non VVT on an LLY and overheated it.
I have been following this as well as my biz partner has an LLY and gets hot. We noticed that the intake plumbing was shrunk down from the LB7 series engine as his Air shutoff valve wouldn't fit, pipes on the LLY were too small! It seems to us, after extensive reading that its a coupling of heat soaking of the intercooler and the inefficient turbo system (turbo, tubing and intercooler). Once you start heat soaking the intercooler, it super heats the rad. EGT's start going up from the turbo pushing more boost, intercooler gets hotter, intake air temp goes up, engine water temperature starts going up and then the cycle just keeps going untill something gives. Either the load goes down, or the engine starts to de-rate. Some fixes of cool air intakes and exhaust upgrades help a little, but not enough.

The fellow that sued GM has a fix out that is a secondary rad mounted down low to accomodate extra cooling. We were wondering if the LBZ rads were that much bigger or what, but you could find a LBZ rad at the wreckers and upgrade to that.
Lil Dog is offline  
Old 08-16-2009, 04:47 PM
  #12  
Banned
 
Join Date: Jul 2006
Location: CT
Posts: 452
Likes: 0
Received 0 Likes on 0 Posts
really? You JUST found this video now????
duratothemax is offline  
Old 03-07-2010, 11:07 PM
  #13  
Banned
 
Join Date: Feb 2010
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Never seen this, thanks for posting.



Originally Posted by pwrtripls1 View Post
I picked this up on another forum I'm on and couldn't resist, even if it means I'm picking on myself a little. lol

Enjoy the pulling power of the cummins vs. Dmax. Also the retardedness of the Dmax owner. Seems most guys I talk to on the Dmax forums have a firm view that your engine coolant temp has nothing to do with your EGT's. A stock LLY Dmax WILL run 1300-1350* pre turbo with a lot of throttle. I.E. a heavy load uphill. Well when you run 1300-1350* EGT's for 5-10 minutes strait then yes you are going to overheat like crazy. You MUST have a better intake, especialy for an LLY Dmax, and a free flowing exhaust. Then with 1050-1100* EGT's overheating shouldnt be an issue. Well most of those guys think I'm crazy and you should be able to run 1350* all day and not get hot.

http://videos.streetfire.net/video/L...htm#commentToptirecar
trev0006 is offline  
Old 03-08-2010, 11:29 AM
  #14  
Registered User
 
OneBigDoofus's Avatar
 
Join Date: Feb 2007
Location: Wes Taycksus Ya'll
Posts: 102
Likes: 0
Received 0 Likes on 0 Posts
Guy's blocking the left lane the whole time? What a idiot, he's got no bizzness pulling a trailer.

Last edited by OneBigDoofus; 03-08-2010 at 12:21 PM. Reason: spelt rong
OneBigDoofus is offline  
Old 03-09-2010, 02:45 PM
  #15  
Registered User
 
jesussaves's Avatar
 
Join Date: Jul 2008
Location: all over see below
Posts: 1,034
Received 3 Likes on 3 Posts
Originally Posted by OneBigDoofus View Post
Guy's blocking the left lane the whole time? What a idiot, he's got no bizzness pulling a trailer.
great catch
jesussaves is offline  

Thread Tools
Search this Thread
Quick Reply: Cummins out towing a Dmax vid.......


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.