Question for Chevy dually guys.

Shake & Bake · 03-29-2010, 05:44 PM

Go with the duramax in an 06' or newer GMC or Chevy with the 6-speed allison transmission and you'll get more power plus better mileage.

Rich Biebel · 03-29-2010, 07:25 PM

I had a '96 GMC single rear wheel pickup.....Vortec 454. It had decent power and towed fine. I bought it new and it served me well untill last Sept. I towed a box trailer with various cars inside and also have a pickup camper I used. Mileage was about 10+ towing just the trailer....add the camper and it would get about 9.....

I sold it and bought a 2007 Duramax.......Wow what a difference!......No comparison.....power and mileage.....It tows my trailer like it's not even there....and that is not an exaggeration......Gets 12+ towing and back and forth to work......and better on the highway......I loved my old truck but my Duramax is way better....

JJ3159 · 03-30-2010, 03:26 PM

it was 96 and up for the vortec ,it is a big diffrence ,in my 89 i had some k&n stuff and a tornado it helped

T Hall · 03-30-2010, 09:15 PM

OK guys, I am stuck with this one for a while. Its not that bad, I dont do a lot of traveling with it, just want to help it out, not trade it just yet, but thanks anyway.

Ron Finney · 03-30-2010, 09:51 PM

Tony,

You can make some minor mods such as better exhaust, K&N filter, etc. However, your truck is a speed density system which means it does not measure the airflow, it is calculated based on cu.in x rpm and then factored for load, air temp and barometer. The newer stuff has mass airflow so it is physically measuring the air coming in and can adapt for increases in airflow. What this means is that on a speed density system if you modify it too much, the calibration can't adjust because it is still assuming a pre-programmed amount of airflow. Example, early mustang GT's guys put the offroad H-pipe on them doing away with the cats and the cars would have idle issues, surging, dying etc. they ran good at WOT because it goes into open loop and max fuel delivery. In your case you need to maintain driveability.

Hope this helps. See you at the track!

Ron & Meridee
396V S/C

03-29-2010, 05:44 PM	#1
Shake & Bake Member Join Date: Mar 2010 Posts: 312 Likes: 40 Liked 37 Times in 33 Posts	Re: Question for Chevy dually guys. Go with the duramax in an 06' or newer GMC or Chevy with the 6-speed allison transmission and you'll get more power plus better mileage. Last edited by Shake & Bake; 03-29-2010 at 05:54 PM.

03-29-2010, 07:25 PM	#2
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,320 Likes: 25 Liked 557 Times in 217 Posts	Re: Question for Chevy dually guys. I had a '96 GMC single rear wheel pickup.....Vortec 454. It had decent power and towed fine. I bought it new and it served me well untill last Sept. I towed a box trailer with various cars inside and also have a pickup camper I used. Mileage was about 10+ towing just the trailer....add the camper and it would get about 9..... I sold it and bought a 2007 Duramax.......Wow what a difference!......No comparison.....power and mileage.....It tows my trailer like it's not even there....and that is not an exaggeration......Gets 12+ towing and back and forth to work......and better on the highway......I loved my old truck but my Duramax is way better.... __________________ Rich Biebel S/C 1479 Stock 147R

03-30-2010, 03:26 PM	#3
JJ3159 Member Join Date: Jun 2007 Location: WEST SENECA N.Y. Posts: 140 Likes: 0 Liked 0 Times in 0 Posts	Re: Question for Chevy dually guys. it was 96 and up for the vortec ,it is a big diffrence ,in my 89 i had some k&n stuff and a tornado it helped __________________ jj h/r 1399 s/r 1399 s/g 1399

03-30-2010, 09:15 PM	#4
T Hall Member Join Date: Nov 2004 Location: Columbus,Ohio Posts: 390 Likes: 0 Liked 0 Times in 0 Posts	Re: Question for Chevy dually guys. OK guys, I am stuck with this one for a while. Its not that bad, I dont do a lot of traveling with it, just want to help it out, not trade it just yet, but thanks anyway. __________________ Tony Hall 3545 S/ST

03-30-2010, 09:51 PM	#5
Ron Finney Member Join Date: Jul 2008 Location: Greenwood, IN Posts: 168 Likes: 0 Liked 0 Times in 0 Posts	Re: Question for Chevy dually guys. Tony, You can make some minor mods such as better exhaust, K&N filter, etc. However, your truck is a speed density system which means it does not measure the airflow, it is calculated based on cu.in x rpm and then factored for load, air temp and barometer. The newer stuff has mass airflow so it is physically measuring the air coming in and can adapt for increases in airflow. What this means is that on a speed density system if you modify it too much, the calibration can't adjust because it is still assuming a pre-programmed amount of airflow. Example, early mustang GT's guys put the offroad H-pipe on them doing away with the cats and the cars would have idle issues, surging, dying etc. they ran good at WOT because it goes into open loop and max fuel delivery. In your case you need to maintain driveability. Hope this helps. See you at the track! Ron & Meridee 396V S/C __________________ Ron Finney 396V S/C

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