2024 GMC Sierra 3500 L8T Gas V8 MPG & 0-60 Test: I Figured Out Why These Trucks Are So SLOW!!!
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- čas přidán 25. 08. 2024
- I finally get a chance to test a 2024 GMC Sierra 3500 AT4 gas V8 with 10 speed Allison against my 24 Chevy gas. I now know why these trucks are so slow! || Like || Subscribe || Share || #2024GMCSierra #at4
Special thanks to Jerry Seiner GMC Buick In South Jordan Utah:
www.seinersouthjordan.com
www.gmc.com
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Loving the GM content, thanks JB. Looking forward to more and more info on these HD gas engines!
Nice review. I got my 2024 GMC AT4 2500 HD 6.6 gas in June...ordered it in April. Loving it. Got rid of my 2018 Silverado 2500 HD Z71 Duramax (Had a ton of electrical issues) plus with all the emissions crap, DEF, Fuel filters, expense of the duramax, decided to go back to gas. Plus my trialer loaded is maybe 5000lbs. I just can't go back to a 1500 series truck after owning a 2500 since 2005 with my first being the 2004.5 LLY 2500 HD Duramax. I have been running 87 octane in the new one. Not sure if it makes that much of a difference to run 89 or even 91??? Thoughts on that? Around town and in traffic I'm getting 11-15 mpg. straight freeway, 15-18, best was 21.2 for a 25 mile average, 18 mpg for 50 mile average. I know my duramax had an overall average of 16.7 for the last 15K miles I owned it. Best round trip I did in my 2018 was 685 miles, 20.18 MPG, CC set at about 64-65. Drove from Orange County CA to Goodyear AZ and back just to see if I could make it on one tank! LOL, I did. (My wife thought I was crazy but she's a good sport) If I can average between 14-15 with this, I'd be stoked, but it's gonna probably be less. I might try a tank of 89 then 91 to see if any difference just for yah yah's. Anyways...great content. Thanks
Just did a drive with my 2024 gmc 3500 at4 and used the adaptive cruise control. Went from southern New Hampshire to tampa Florida. Seems to work way better than the adaptive cruise control my 2018 Honda ridgeline black edition had. I thought it worked great on the closest setting. The occasional asshat that cuts you off can be annoying. But I usually saw them coming and would brake before the adaptive cruise control had a chance to jam up the brakes
I had a 23 with the 6 speed and now a 24. I will say the 6 speed did accelerate a little quicker to 30-40 mph IMO but the 10 speed is so much more refined and does a better job towing. Also it has no issue passing at highway speeds.
Maybe try holding the traction control button and turning of traction control and stability control. If it spins try 4wd with the same setup of tcs and stabilitrak off.
JB the air density changes a lot throughout the day, try to match the density altitude for the testing and you should get better results, check the airports near by on what density altitude they are reporting on google
Try putting it in tow haul mode and see if that helps. May also try the same test with a 1500 AT4 6.2. Different truck sure but see if similar results.
What do you think about the AT4 interior vs your high country? Which do you like better RE: vent placement and trailer brake, I guess if you could have either which would you choose? Love the content!
2022 Ford F-250 CrewCab Lariat FX4 7.3L to 2024 GMC 2500HD CrewCab AT4 L8T. GM has a better ride (independent front suspension vs solid front axle) as well as a much smoother V8 (L8T feels more refined). 10 spd 'Allison' shifts smoother. Definitely feel like GM has the nicer, better engineered gaser HD truck. Looks too, but that's just opinion.
@jb reviews try and turn off the traction control to test and see if torque management is holding it back if you hold down on the button for a few seconds it should disable all the traction and stability control. But it may be slower if it can’t get traction who knows.
You should do a before after with the banks pedal monster on the gasser.
The tachometer on the right side of the cluster looks so wierd.
Try doing it in tow hual mode. Might help
Never understood the need for wanting speed in a pick-up truck, never mind a heavy duty one. These are trucks meant for hauling and towing, why does anyone care how fast it gets to 60 mph from a stop?
I believe it's more of how quickly can I get up to speed merging on the interstate when loaded. I agree with you that unloaded seems to be a bit irrelevant, but it also can represent the loaded capabilities as well. In a way, not exactly but hopefully you know where I'm coming from.
@@JetTech1966 It’ll get to 60 mph whenever it gets to 60 mph lol. I understand what you’re saying but I’d be more focused on how capable and how reliable the truck I’m buying is, rather than it’s speed from 0-60 mph. That’s just me though.
You should do a 0-60 test with a nissan titan xd. Would be interesting to see how it compares to these trucks.
The engines are not broke in yet.
Exactly! If I were the dealer I'd be pissed! Pretty much ignored break-in suggestions - for first 500 miles, avoid rapid acceleration, don't rev over 4,000 RPM for gas engine. Pointless test until engine is properly broken in, which this one may never be now.
Guys I tune GM Vehicles for a living. I can sum up what the issue is in very simple terms for these trucks. Especially the 6.6l L8T. The problem is a few things, but 2 stand out the most. You need to run 91 or higher Octane. GM vehicles start out using the high octane spark table when you start the vehicle. If you have a low octane fuel the engine starts to spark knock. Timing is then pulled from the low octane table until you cycle the key and start the whole process over. The low octane table is trash in these, meaning next to no timing. You should always use high octane fuel to get the most timing and performance. The 2nd issue is they don't allow power enrichment until over 5000 rpms. This is a huge issue only second to the spark problem and sometimes I didn't get power enrichement at all. You can get around the spark issue with the High Octane, unfortunately you can't get around the enrichment problem without a tune. I just tuned a 2022 6.6l L8t, only mods where K&N panel filter. This truck had the 6 speed 6l90 transmission. When I was done with the tune (Engine and Transmission) I picked up over 1.5 seconds to 60 mph @ sea level. The 3rd issue is the transmission shift points and tq management, once again no way around that without a tune. These are actually really quick and fun to drive trucks once its tuned properly.
I don’t think it’s good for these new gas trucks to drag race them.
Maybe they need to get 2speed axles so you can split , it made to tow and work not race,get a half ton 6.2 if you want it faster
Honestly I agree the new hd trucks gotta have torque management plus with it being all stock doesn’t help either the engine needs to breathe
That whole breathing thing really doesn't make a difference with these trucks. I installed an S&B CAI on my gasser and other than a little more intake sound, really no benefits. It's looks great and sounds great, but the factory intake works just as good. But I do agree torque management has to be coming into play.
@@JetTech1966that’s really disappointing. Just ordered one for my 2024 gasser
@@63nickmcd be sure to install the rubber plug on the side of the box, without it the engine will bog and sound horrible.
Quick question. Are you resetting the mpg onboard after doing to the 0-60 run. I would think that is going to decrease the mpg results a bit.
What about the towing? I am looking at getting this configuration with the 6.6 gas motor and I am Having a 32ft center console boat built. With boat and trailer combined and 300 gal of fuel i an looking at 14k lbs. in SW FL.
Heard my name lol. So I’ve done the calculations for you so here you go.
1st gear top speed with a 3.73 is 31.07 mph. A 4.10 would be 28.27 mph
2nd gear is 52.17 mph for a 3.73 and 47.46 mph if it had a 4.10.
3rd gear is 72.43 mph for a 3.73 and 65.89 mph if it had a 4.10.
So both would hit 60 in 3rd gear. And that’s not too much of a surprise because a 4.10 to a 3.73 is not that much for a difference. So it would be hard to say if it would have an advantage here. I could argue it both ways honestly. I think the 3.73 would be ahead because in 1st gear it’s over 2 mph further ahead at the top of the gear. But again, no way to tell without just doing it.
And to be fair I think your first 0-60 in your truck was 11.6 or 11.8. So it does stand to reason if yours gained about a second after you drove it some this AT4 would also. Just a thought.
Definitely should have a 4.10 for a HD truck.
Not an option for 2024s
How many miles do you have on the clock of this GMC and your Silverado?
I think it needs an 11th gear.. 😁 Maybe a 12th or even a 13th.. If I'm a guessing man, it's elevation and airflow.. I told you before I'm not a expert at really anything, that's just my guess.
So so wish GM would've up the hp and torque when it comes to the 2500. why put in less hp and torque than the 6.2L. These trucks should be maybe 430hp and 475 ft lbs of torque there around.
New truck are detuned for first 5k miles
I don’t think it’s torque management, I just saw another video of a guy doing 0-60 with the 6.6 and Allison ten speed and he got 7.35. That’s significantly faster than what you got. I’m not sure what the problem is with your trucks but something in definitely fishy
Yes I have seen people in normal elevations get much better times.
@@Tool0GT92I've read that the L8T on these trucks essentially already have a cold air intake from the factory. I wonder if with the elevation that does almost nothing, but then with reduced elevation the CAI makes a noticeable difference (on top of the lower elevation itself).
The videos I've seen where the L8Ts are in the 7s are all at sea level(ish). It's gotta be elevation related, at least for a large portion of it.
I know but 3 seconds slower? That’s a lot for only Utah elevation
@@mckayspeakman1600 I know on tfl they are in Colorado and all the na cars are slow
No option to turn off the traction control..? I feel like my older 2500 is quicker than those turds... More like they need another 250 hp. And 500 lb/ft torque...
That seems really slow. 7700 pounds also seems really heavy for a gas truck.
My 2002 2500HD Crew Cab 4WD with the 8.1 and Allison weighs 5800lbs. I do not know where they got the extra 2000lbs in the new trucks.
all that extra crap like sound proofing and wiring @@motofunk1
IS THAT A CLUTCH FAN ON A 70K TRUCK?!!!?! Also these do not need any more HP. They are super dumbed down and programmed for torque and not speed. Buy a tuner and start replacing some engine parts to free it up and I bet just like its predecessor the LS engine woke up to an insane power spike with no issues.
3% horsepower loss per 1000 feet of elevation. What elevation are you testing
I looked up the elevation for south Jordan Utah. 4439 above sea level. That's 13½ % or 54 hp loss on your truck.
with all the computing power on these vehicles, they don't adjust air fuel mix for altitude?
They do adjust for the air/fuel mixture but the air is less dense the higher you go resulting in lower hp numbers. The turbo on diesels offsets it by forcing more air into the engine.
And higher octane is going to perform better 100 times out of 100. Whoever said that is slow.
In the head. 😅
Stop using 85 octane. I will never understand why you guys use that crap, regardless of elevation. GM explicitly states that 87 is the minimum requirement. TFL did the same thing in a 6.6 Silverado and compared it to a Ford 7.3 using 87 octane. The differences were severe. People need to stop being cheap and put the right fuel in the truck. I'm prepared for a bunch of baseless replies telling me I'm full of shit, but prove to me I'm wrong and I'll shut up
You are actually 100% correct in this. In fact the 87 octane is trash too. They only use it because it get decent power on cheap gas. Great marketing. I tune these for a living and can attest that they make alot more power on 91 and up.
Higher octane is not going to reduce/hurt performance. For those who think this are 🤡
These natural asparated trucks are going to take a HP hit due to the elevation. 10-11 second 0-60 seems normal for the elevation in a 7500 pound vehicle.
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