8.1 Engine Mods - Page 2

Ed Wright · 03-08-2018, 10:32 PM

Quote:

Originally Posted by Adger Smith

Ed, Do you have to do the tune on the truck or can I just send you the ECM?
Mine is a 2002 1 ton.
Hope your wife is doing better..

Yes, Adger, you can just send the ECM. People do every day.
If you have the Allison transmission, the gains won't be as impressive. The Allison has so much Torque Management programmed in it's computer (TCM) to protect it, that thing calculates the torque output, and tells the ECM to pull the timing back to protect the transmission. I had one truck with that transmission, and hated it. The 4 speed 4L80E trucks are much faster, use less fuel, and tow trailers better. Performance gains with the Allison are not nearly as noticeable. On my chassis dyno, the Allison trucks gained very little. I towed with a gasoline motor home a few years ago, with an 8.1L & 4L80E, it towed my trailer easily, and never an issue.

Adger Smith · 03-09-2018, 06:21 AM

Yes, Ed mine has the Allison 1000 Trans.
I read an article about "Limp Mode" in the transmission if you modify the engine and the two computers don't communicate.

killintime6968 · 03-09-2018, 10:20 PM

Ed, do you have a tune setup for a 7.4 chev in a 2000 1 ton dually auto. The fuel mileage when towing is brutal. Your always looking for gas station.

Rsmith38 · 03-11-2018, 09:23 AM

My 96 Crew cab 7.4 auto towing a 10K trailer gets 8 - 9 MPG at 65 MPH
Is that the range you get?

Ed Wright · 03-11-2018, 04:38 PM

We sold our motorhome, if I get to race again I will be back to towing with my '99 7.4L Suburban. If I don't run much over 65, it gets 8 to 10, depending on hills & head winds.
Oklahoma has a 75 MPh speed limit on it's turnpikes (lots of toll roads in this crap hole state) mileage falls off a cliff @ 75/80. My 454" tows easier on much less fuel at 60/65.

killintime6968 · 03-11-2018, 04:50 PM

My truck gets 6 to 8mpg on a good day towing @ 60mph

Tom Meyer · 03-11-2018, 07:03 PM

ED could you PM your address and turn around time. Thanks Tom

03-09-2018, 06:21 AM	#12
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,348 Likes: 434 Liked 676 Times in 260 Posts	Re: 8.1 Engine Mods Yes, Ed mine has the Allison 1000 Trans. I read an article about "Limp Mode" in the transmission if you modify the engine and the two computers don't communicate. __________________ Adger Smith (Former SS)

03-09-2018, 10:20 PM	#13
killintime6968 Member Join Date: Oct 2009 Location: Whitecourt,Alberta,Canada Posts: 226 Likes: 3,789 Liked 41 Times in 24 Posts	Re: 8.1 Engine Mods Ed, do you have a tune setup for a 7.4 chev in a 2000 1 ton dually auto. The fuel mileage when towing is brutal. Your always looking for gas station. __________________ Bruce Cameron 68 Nova 396 E/S 68 Camaro SS/? ex Checkmate Modified

03-11-2018, 09:23 AM	#14
Rsmith38 Member Join Date: Mar 2011 Posts: 186 Likes: 0 Liked 28 Times in 15 Posts	Re: 8.1 Engine Mods My 96 Crew cab 7.4 auto towing a 10K trailer gets 8 - 9 MPG at 65 MPH Is that the range you get?

03-11-2018, 04:38 PM	#15
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 168 Posts	Re: 8.1 Engine Mods We sold our motorhome, if I get to race again I will be back to towing with my '99 7.4L Suburban. If I don't run much over 65, it gets 8 to 10, depending on hills & head winds. Oklahoma has a 75 MPh speed limit on it's turnpikes (lots of toll roads in this crap hole state) mileage falls off a cliff @ 75/80. My 454" tows easier on much less fuel at 60/65. __________________ Ed Wright 4156 SS/JA

03-11-2018, 04:50 PM	#16
killintime6968 Member Join Date: Oct 2009 Location: Whitecourt,Alberta,Canada Posts: 226 Likes: 3,789 Liked 41 Times in 24 Posts	Re: 8.1 Engine Mods My truck gets 6 to 8mpg on a good day towing @ 60mph __________________ Bruce Cameron 68 Nova 396 E/S 68 Camaro SS/? ex Checkmate Modified

03-11-2018, 07:03 PM	#17
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 900 Likes: 51 Liked 301 Times in 105 Posts	Re: 8.1 Engine Mods ED could you PM your address and turn around time. Thanks Tom __________________ Tom Meyer 5240 SS Stock ???