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Liking the 6.6 gas

Carolina

By Carolina
in 6.6L Gas V8 (L8T)

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Carolina Enthusiast

Carolina

Posted
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Posted (edited)
21 minutes ago, ShotgunZ71 said:

 

Thanks for the review on towing in the mountains. I've had my 5th wheel in some rolling hills so far, but not the mountains with my 6.6 gasser. I, too, noticed if you stay above 3000-3500 it will keep speed without slowing down and then having to play catch up. Sometimes I'd lock out 5th and 6th so that the RPM would be elevated. At 70 mph in 4th I am at 3000 and in 3rd it is around 4000. Your fuel mileage was pretty decent, too.

The shifting was noticeable but it wasn’t horrible . If I turned the radio on I would forget about it . It was landing barely above 3k . I’m fine with the mileage especially with gas at $1.80 a gallon . With the work it did it’s an improvement. I’m happy . I’ve never dropped below 8 in my LMM but neither has it hit 10 on this trip  

Edited by Carolina
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Ray Pickle
Ray Pickle

I am halfway thru my trip from cincinnati to big pine key florida, first tank in driving rain 8 mpg, 2nd tank 8.9 3rd tank 9.1 4th tank 9.3. I will be returning home in a week and will update. I am to

Carolina
Carolina

I just finished a 600 mile round trip from Sc thru NC and TN mountains towing 9130 pounds . Interstate grades were a 3 mile 6% , 1 mile 7 % ,  6 mile 7% and a few 10% backroad grades . I can say I was

Carolina
Carolina

So have you towed with one or you just watched the IKE pull and know everything about it now? You ever thought about the fleet perceptive ? The 6.0 is one of the most respected engines for HD service

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flyingfool Senior Enthusiast

flyingfool

Posted
Posted (edited)

6.6L should work great with the v4 mode, since the cranshaft has been stroked vs the 6.2L.. means your using more torque and sipping more fuel. not to mention great for pulling heavy loads in v8 mode.

best gear option is the larger rear diff in 3.75 gears with tow package ,option. i never seen any losses in highway mpg vs the light duty 3.42 rear end.

 

we'll see what mess the GM makes of the transmission, hope they tune it better

Edited by flyingfool
Limelight Enthusiast

Limelight

Posted
Posted
50 minutes ago, MTU Alum said:

There is no AFM on 6.6 gas (l8t).  

 

#iworkforGM 

Pretty much nothing that guy said made sense in that post anyway. Lolo

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Carolina Enthusiast

Carolina

Posted
  • Author
Posted
3 hours ago, Limelight said:

Pretty much nothing that guy said made sense in that post anyway. Lolo

Lol . Here is my trip average, forgot to post it . 

C62BCC61-BEC0-4EE2-B39E-2BD7036CF507.jpeg

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flyingfool Senior Enthusiast

flyingfool

Posted
Posted

I wonder if they will have an option for the 6.6L in a 1500 truckLight truck?

18 hours ago, MTU Alum said:

There is no AFM on 6.6 gas (l8t).  

 

#iworkforGM 

 

C/K Man Enthusiast

C/K Man

Posted
Posted
On 3/9/2020 at 7:17 AM, bshort said:

GM fleet operators would love to continue on with the 6.0 as an option.  

The L96 6.0L is going to continue in certain Isuzu, Fuso, and Freightliner trucks, but it looks like the L8T will replace it in most applications, including the Express/Savanna vans.  What remains to be seen is if GM will offer the L8T in the Silverado medium duty and larger LCF commercial trucks.  They need a gasoline option in those models. 

Chepachetchevyguy Enthusiast

Chepachetchevyguy

Posted
Posted

Hi everyone I’m a newcomer here decided to join as I just bought a 2020 Chevy 2500 lt z71, ccsb with the l8t. We love the truck more than we thought we would, huge improvement over the 6.0, which IMO had very few flaws, never owned one but many family members and friends have and I have driven many. I see a lot of people complaining about the 3:73s on here, I’m assuming these people haven’t driven one, our truck averages 14.5 all around and the wife had it getting 16.5 on a 50 mile stretch of 2 lane cruising around 55. This is great mileage for the size and power of these trucks. Only towing iv done so far is my father in laws 10k lb Kubota excavator and I was extremely impressed for a gas powered truck, no complaints. Trip was only about 15 miles on hilly backroads, no highway towing yet but I will share my experience with it as it comes. As for everyone saying that ford is outdoing gm in the drivetrain department, I have yet to see a ford truck that is as trouble free and long lasting as the gm trucks with the 6 liter were. And I know a lot of ford owners and I drive one for a work vehicle. Hopefully the 6.0 reliability caries over in the l8t. So overall extremely happy with our new truck. As I said I’m a newcomer here and I’m also the happy owner of many 99-06 gen 5.3 vehicles, a truck, a Yukon, and a burb. I have quite a bit of experience working on these and would be happy to help anyone looking for advice.

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heymrdjCW Enthusiast

heymrdjCW

Posted
Posted
Hi everyone I’m a newcomer here decided to join as I just bought a 2020 Chevy 2500 lt z71, ccsb with the l8t. We love the truck more than we thought we would, huge improvement over the 6.0, which IMO had very few flaws, never owned one but many family members and friends have and I have driven many. I see a lot of people complaining about the 3:73s on here, I’m assuming these people haven’t driven one, our truck averages 14.5 all around and the wife had it getting 16.5 on a 50 mile stretch of 2 lane cruising around 55. This is great mileage for the size and power of these trucks. Only towing iv done so far is my father in laws 10k lb Kubota excavator and I was extremely impressed for a gas powered truck, no complaints. Trip was only about 15 miles on hilly backroads, no highway towing yet but I will share my experience with it as it comes. As for everyone saying that ford is outdoing gm in the drivetrain department, I have yet to see a ford truck that is as trouble free and long lasting as the gm trucks with the 6 liter were. And I know a lot of ford owners and I drive one for a work vehicle. Hopefully the 6.0 reliability caries over in the l8t. So overall extremely happy with our new truck. As I said I’m a newcomer here and I’m also the happy owner of many 99-06 gen 5.3 vehicles, a truck, a Yukon, and a burb. I have quite a bit of experience working on these and would be happy to help anyone looking for advice.

Thanks for sharing your experience. There seems to be some all over the place experiences between Ford and Chevy. For our department, hands down the 6.2 truck has been the longer lasting truck over the 6.0 Chevy. That’s not just a powertrain view, that’s a whole truck view. We have many of them over 250,000 and the truck has held together. Had issues with both models, the Chevy stuff being a little newer, but that’s our experiences. Mainly dump and service bodies.

I really don’t think you can go wrong with either truck. Money saved on one issue will get lost on another.
Chepachetchevyguy Enthusiast

Chepachetchevyguy

Posted
Posted
12 hours ago, heymrdjCW said:


Thanks for sharing your experience. There seems to be some all over the place experiences between Ford and Chevy. For our department, hands down the 6.2 truck has been the longer lasting truck over the 6.0 Chevy. That’s not just a powertrain view, that’s a whole truck view. We have many of them over 250,000 and the truck has held together. Had issues with both models, the Chevy stuff being a little newer, but that’s our experiences. Mainly dump and service bodies.

I really don’t think you can go wrong with either truck. Money saved on one issue will get lost on another.

I can agree to all over the place experience with Chevy/ ford, I know a lot of ford owners that are happy with their trucks other than the ride quality, here in the rustbelt of Rhode Island I have most experience with the gen 99-07 trucks and their downfall was rust and electronics, other than that near bulletproof. We have a good friend near us that has a 2004 and 2008 f250s and seems to constantly put manifolds and front ends on them. Sorry to get the discussion away from being happy with the 6.6 gas! Towed again today and it reminded me that I forgot to say how happy I was with all the cameras on the truck making trailering alone much easier. I also think/hope the electronic parking brake is going to be a big improvement for us here in the rust belt

Limelight Enthusiast

Limelight

Posted
Posted
On 3/6/2020 at 12:22 PM, bshort said:

GM really missed the mark on this application with the displacement and transmission when ford has the 7.3 and a 10 speed.  4.30 rear also available on the Ford. 

Thanks for that enlightening post, lol.

bshort Enthusiast

bshort

Posted
Posted
4 minutes ago, Limelight said:

Thanks for that enlightening post, lol.

Here to help you. 

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YukonXL04 Enthusiast

YukonXL04

Posted
Posted

I'm not gonna lie I'm disappointed with the new engine trans combination. I was hoping for more power and torque, with atleast a 8SPD or a 10spd. Why give the diesel a 10 spd and the gas a 6? Makes no sense. 

 

I find I need a 3/4 ton sometimes, dont want the diesel headache, but I want my 6.2 and 8spd in a 3/4 ton. Or something better. I have no doubt it's better than the 6.0. But 15 mpg is pretty bad for nowadays. I get 22-24 on the highway in my 6000lb half ton 6.2 4x4. 

 

Why wouldn't you give it it more gears so you can get some decent highway mileage?

 

 

Chepachetchevyguy Enthusiast

Chepachetchevyguy

Posted
Posted
13 hours ago, YukonXL04 said:

I'm not gonna lie I'm disappointed with the new engine trans combination. I was hoping for more power and torque, with atleast a 8SPD or a 10spd. Why give the diesel a 10 spd and the gas a 6? Makes no sense. 

 

I find I need a 3/4 ton sometimes, dont want the diesel headache, but I want my 6.2 and 8spd in a 3/4 ton. Or something better. I have no doubt it's better than the 6.0. But 15 mpg is pretty bad for nowadays. I get 22-24 on the highway in my 6000lb half ton 6.2 4x4. 

 

Why wouldn't you give it it more gears so you can get some decent highway mileage?

 

 

Have you driven one? You won’t be disappointed. And what are you towing/ or doing that you need more than 400 hp? That’s quite sufficient. And 15 mpg isn’t bad for a 3/4 ton gas powered truck nowadays, mine is getting north of 16 on the highway. Try one out, you’ll like it. As for keeping the 6 speed, maybe it’s just the old don’t what isn’t broke 

MORSNO Enthusiast

MORSNO

Posted
Posted
14 hours ago, YukonXL04 said:

I'm not gonna lie I'm disappointed with the new engine trans combination. I was hoping for more power and torque, with atleast a 8SPD or a 10spd. Why give the diesel a 10 spd and the gas a 6? Makes no sense. 

 

I find I need a 3/4 ton sometimes, dont want the diesel headache, but I want my 6.2 and 8spd in a 3/4 ton. Or something better. I have no doubt it's better than the 6.0. But 15 mpg is pretty bad for nowadays. I get 22-24 on the highway in my 6000lb half ton 6.2 4x4. 

 

Why wouldn't you give it it more gears so you can get some decent highway mileage?

 

 

The 6.2 in the 1500 class is a light duty aluminum block engine, it would never last the years and beatings that fleet vehicles do daily and the loads that many of us put on privately.  The 1500 transmissions would never last under these conditions either.  I'm sure we'll see a better transmission in the 2500/3500 class eventually.  There are 6.0 2500/3500's fleet trucks in the million mile range, HD's are built to last not go fast like a 1500.

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