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2017 sierra denali ultimate

dave8699

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IBDRINKEN Enthusiast

IBDRINKEN

Posted
Posted

I had the vibration between 70-80 every single time I drove it on my 2015 1500 from day one. I even put a cup of water in the cup holder and had my wife video so I could show the dealer. Took it to the dealer and basically just threw money at it replaced the tires that didn't work then rebalanced them and did a tire rotation stil no luck. We also roared them and finally just gave up and traded it it

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jdcannan New Member

jdcannan

Posted
Posted

Great to see a crowd of Denali enthusiasts. I currently own a 17' Sierra Denali Ultimate and am looking for some advice / recommendations for engine upgrades for the 6.2L. My goal is to have increased power, mpg, remove the governed speed limit, and most importantly still maintain my GM warranty. Look forward to hearing some suggestions and thanks in advance.

SandyNeck Enthusiast

SandyNeck

Posted
Posted

Well, I'm no expert, but I suppose you could get some moderate gains with bolt-on enhancements like low restriction intake and exhaust (K&N, Borla, etc.) while maintaining your warranty. I believe changing the top speed limit would involve reprogramming the ECM. Doing so could also achieve powerband gains, shift point improvements, fuel consumption changes, and so on. Such services are certainly available in the aftermarket with many reporting positive results, however, reading I've done indicates that GM is cracking down on reprogramming and doing so would void your warranty.

 

Reprogramming is very obvious for a competent tech to spot and subsystems on current models (engine, transmission, etc.) interact with each other quite extensively. So if for example, you reprogrammed the ECM and later had a problem with your differential: GM could argue that increased power from the new programming subjected the diff to torque that exceeded its specified tolerances, and thus the failure is not covered under warranty. Even if the reprogramming did not cause the failure, it gives them an excuse not to cover the repair, and the things that could break would not be cheap to fix at an owner's expense. Furthermore, it could allow them to void the remaining balance of your warranty period going forward.

 

I have the 6.2L and considered some tweaking, realizing that there is potential for improvement. I held myself back, concluding that the gains weren't worth the risk. Just about everything I could think of that offered serious improvement would void the warranty. Also, while better would be nice, performance and fuel economy aint that bad from the factory. I think I'm gonna keep it stock, at least for the time being. I might reconsider once the warranty has expired.

 

Lastly, I believe the top speed limit is justified by the speed rating of the factory-installed tires. You might inquire with your dealer if there is programming available from GM with a higher top speed limit for those that have installed higher speed rated tires. It may be a long shot, but it's worth asking.

 

Best Of Luck.

Dnt Senior Enthusiast

Dnt

Posted
Posted

I had the GM Borla exhaust and a Cold Air Inductions intake on my 2016. I actually got tired of the exhaust noise and moan from the intake after a year of driving. I think I am going to leave this one bone stock with no changes, On the ECM changes I would only do that after I had 10 or 12,000 miles to make sure that you do not have a problem child engine/transmission, Plus you should be prepared and be able to afford to cover cost if something does happen before the factory warranty coverage is out and they deny coverage. Now on a different subject what is the extra hole in the trim at the bottom of the windshield on drivers side. Looks like where a heads up display could be added easily on these????

SandyNeck Enthusiast

SandyNeck

Posted
Posted

I had the GM Borla exhaust and a Cold Air Inductions intake on my 2016. I actually got tired of the exhaust noise and moan from the intake after a year of driving. I think I am going to leave this one bone stock with no changes, On the ECM changes I would only do that after I had 10 or 12,000 miles to make sure that you do not have a problem child engine/transmission, Plus you should be prepared and be able to afford to cover cost if something does happen before the factory warranty coverage is out and they deny coverage. Now on a different subject what is the extra hole in the trim at the bottom of the windshield on drivers side. Looks like where a heads up display could be added easily on these????

Regarding the 'extra hole'

I think you may be referring to the visual warning for the Forward Collision Alert System (if so equipped). It projects a red flashing light onto the windshield when it decides you're about to hit something. I guess you could call it a HUD of sorts, I believe there's a row of red LED's at the base of that hole. Depending on vehicle configuration and system settings, it may be accompanied by an audible warning, an amber indicator at the base of the instrument panel, vibration of the safety seat, disengagement of Cruise Control, brake system preparation for imminent extreme braking, or actual automatic application of the brakes (Forward Automatic Braking).

norulz25 Enthusiast

norulz25

Posted
Posted

I love my '17 Ultimate, even with the shaking on the highway. I get compliments on it all the time.

 

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projectpunisher Enthusiast

projectpunisher

Posted
Posted

Hey guys,

Any of you here running a leveling kit? I was going to get a lift but I'm going to wait on that till we move next year and I can work something else with the new house. Mean time I need something done it's driving me nuts. Lol.

 

 

Sent from my iPhone using Tapatalk

Deebo Enthusiast

Deebo

Posted
Posted

I'm very pleased with my '17 GMC Denali Ultimate thus far.

The power and gas mileage is quite impressive.

I'm spoiled by the intellibeam headlights and lane keep assist.

Dnt Senior Enthusiast

Dnt

Posted
Posted

I know this will not increase my 0 to 60 time but I think it will greatly increase my enjoyment of the truck. Fold-a-Cover G4 Elite with the recessed tool box just looks like the perfect setup with the TriFold steps with the front section that opens independently and the cool little box in there. I am looking for someone that has one already so I can get some feedback before I order one............ What are you guys using for a bed cover can someone order one and get it on there right quick and come back with a review for how it works with the TriFold steps?.

  • 2 weeks later...
Dnt Senior Enthusiast

Dnt

Posted
Posted

OK so I guess no one wanted to order one. i just went ahead and got the bed cover (did not get the toolbox yet) looks pretty good so far it appears to be sturdy with nice milled aluminum brackets.

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1radtoy Enthusiast

1radtoy

Posted
Posted

zero vibrations on my 2017 Denali Have 16k miles miles on it and no issues yet. Love the truck.

  • 4 weeks later...
MarkRo New Member

MarkRo

Posted
Posted

I bought a 2017 1500 Denali 6.2 and have had it in shop 3 times for trying to get them to fix the rough idle of the truck. Last time told me it was a motor mount issue and replaced the motor mounts. I can tell no difference Very dissapointing truck after you spend this kind of money.

 

M

Dnt Senior Enthusiast

Dnt

Posted
Posted

MarkRo so can you record the rough idle and post it? I think they all have a slightly rough idle and I have driven at least a dozen 6.2's over the last year while shopping. All of them had a slight idle shake. I kind of liked it, reminded me of my ole transam in high school with the cam. You might have something unusual there?

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