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20 vs 22 performance difference

leddySS98

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leddySS98 Enthusiast

leddySS98

Posted
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I test drove 2 trucks this weekend from 2 different dealerships... both had the 6.2 motor, one had the Denali pkg and the other the Ultimate Denali pkg.. at a red light I kinda mashed the throttle to feel the power of the truck. The seat in the pants feeling put a huge grin on my face for both me and my friend, but when I basically did the same thing in the other truck it didn't react the same at all with the same forceful feeling... Both 6.2, both 8 speed... both crew cab with short bed configuration... only real difference was the ultimate had the 22 inch rims...

 

I liked the looks of the 22inch rims, but it's not must by any means... but I did like the seat in the pants feeling better... and that truck had the 20's... I'm curious if my results were the normal or if it was purely just a fluke and both sizes produce equal results.

mjdxtreme Enthusiast

mjdxtreme

Posted
Posted

Your results are normal. I had a 2008 sierra denali with a supercharged 6.2l It had 22 inch rims and was not a quick as it should have been. Now I have a 2015 sierra denali with the 6.2l. It seems just as quick as my 08. The mass of the 22's take a lot to get them moving over the 20's. The gm rims are pretty heavy. Skip the 22's and get the 20'. I dont think I will ever get 22's again as I love my power.

 

I would guess that you would see power differences at the ground on a dyno. May not be huge differences but im sure there would be some.

camcamaro1991 Enthusiast

camcamaro1991

Posted
Posted

aka unsprung weight/mass, however I believe its more of a traction issue. I bet the wheel and tire package is within 15-30lbs of 20's vs 22's total. I bet one of the dealers put 87 octane in 6.2

 

The Ultimate package is just a Sunroof, 22's wheels, chrome tow hooks, Tri-mode steps, trailer controller, ( lane keep assist w/intell lights and forward collision alert, safety seat) <- those 4 are always packaged together.

 

The 6.2 is an up charge regardless of the package as well as rear seat blu-ray, I choose not to get the Ultimate package as I did not want a sunroof nor 22's (I have said this many times of the forums, IMO I hate MRC with 22's), outside of that I have every option. After owning a sunroof on my 2013 Sierra Denali I will never own one again, the inner seal and opening get so damn dirty and they are a controlled leak.

 

You can always sale or trade your 22's

leddySS98 Enthusiast

leddySS98

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The Denali I test drove had the trailer controller, lane keep, forward collision stuff to. It might not be standard to have the trailer controller but it can be added for a couple hundred bucks i believe ... but for $6000 package price...the only part I really liked was the tri mode step which can be added on to the regular denali pkg for $995. The 22's were very nice looking rims but to lose the same feeling of pants in the seat/being pushed back into the chair, I'd be happier with the 20's given the performance feeling, plus the lower cost.

 

I only had the 2 test drives, with the heavy foot at the green light, and I wasn't power braking the truck off the line or anything crazy, I just floored it at the green light. The truck with the 22s just didn't have the same 'feeling' to it off the line...

 

I was just wondering if this was the norm, or purely a fluke in my test drive... and so far it sounds like the 22s do make the engine work a lil harder to do the same thing... But I dont think they do a 0-60 test or a dyno pull on the denalli vs the denalli ultimate pkgs, or test the 2 different sized tires that I could find so I asked here for opinions.

TxTruckMan Senior Enthusiast

TxTruckMan

Posted
Posted

I have GM 22's on my 2015 6.2L Denali and I can definitely light the tires up. I've even chirped them going into 2nd gear from a rolling start. There might be a slight difference between the 20's and 22's, but with 420 HP and 460 TQ it would be hard to notice.

 

Are you familiar with the kick-down mode on the gas pedal? If not, it's like a false bottom to the gas pedal that you need to push through. Just wondering if you accelerated the same in both trucks. I only use it occasionally.

crushNchowda Senior Enthusiast

crushNchowda

Posted
Posted

What you experienced is similar to what happens when you swap OEM rubber for 10 ply LT tires that weigh 55-60 lbs a piece....although my guess would be that the OEM 22" wheel/tire package is probably more like 10 lbs heavier per corner vs. the 20" compared to a jump of 15-20 lbs when swapping 20" OEM rubber for LT tires.

 

The 22"s come w/ bridgestone duler AT's 285/45/22 weighing in @ 44 lbs a piece while the 275/55/20s weigh 39 or 40 bs so you gain a little bit there, but I would guess the 22" rims weigh close to 10 lbs more than the 20"s - for comparison I have the OEM 20" AT rims on my 2015 and I have a set of granite alloy brand 20" wheels I run my snows on, those grainte alloys in same 20" size weigh 7 lbs less each!!!! So moral of the story is GM rims are heavy.

leddySS98 Enthusiast

leddySS98

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Both trucks were in AWD mode at the time so there were no burn outs or tires chirping.. , and it's possible I just didn't kick down the pedal as far the 2nd time...And no I was unaware of gm's kick down/false bottom feature. I just noticed a difference between the two trucks... my friend agreed with me as well the 2nd truck just wasn't as impressive even though it was the 'ultimate' = ) ...

 

And maybe it was simply I had the salesman with me the 2nd time, and I wasn't impressed by him at all... I thought the rims looked very nice on the truck but not a must have for me..., where as I do want the 6.2L!!! when I buy the truck = )

camcamaro1991 Enthusiast

camcamaro1991

Posted
Posted

Both trucks were in AWD mode at the time so there were no burn outs or tires chirping.. , and it's possible I just didn't kick down the pedal as far the 2nd time...And no I was unaware of gm's kick down/false bottom feature. I just noticed a difference between the two trucks... my friend agreed with me as well the 2nd truck just wasn't as impressive even though it was the 'ultimate' = ) ...

 

And maybe it was simply I had the salesman with me the 2nd time, and I wasn't impressed by him at all... I thought the rims looked very nice on the truck but not a must have for me..., where as I do want the 6.2L!!! when I buy the truck = )

Leddy, the K2xx's don't have AWD (AWD was an option on some GMT- 800 & 900's), you mean in "auto 4 wheel drive"? don't mistake the 2 as the same. My understanding is the auto 4x4 its similar as the older autotrac transfer cases, it uses a set of clutch packs to engage the front drive shaft's when slip is detected.

leddySS98 Enthusiast

leddySS98

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Well one of the dealers I talked to told me the Denali had 2wd, awd, 4high, and 4 low... The Denali use to come in AWD only, but they changed it out to increase fuel economy... I think the dial said auto, in between the 2wd and the 4x4... but my point being I had both trucks in the same position on the transfer case dial on the dash.

 

And I'm not saying that whatever a dealer says is always true... I had one the same day that tried to tell me if you want the tri mode step you have to buy the ultimate pkg and the dvd entertainment system was included in the ultimate pkg as well...

Dnt Senior Enthusiast

Dnt

Posted
Posted

You know I think there is something going on with the gas pedals on these Sierras. Go back and adjust the pedals to the same position (first button on drivers side) I adjusted mine out a good bit yesterday (i guess they were all the way down) and it is night and day with gas pedal throttle response being much better. (one of my main complaints) Does not seem like logical that it should make a difference but it does,....... might be an issue with their drive by wire system just not sure... Difference in mileage from truck to truck could make a slight difference if one transmission has learned a little more than the other one. I do not see the wheel size being a big difference maker there is something else going on.

crushNchowda Senior Enthusiast

crushNchowda

Posted
Posted

You know I think there is something going on with the gas pedals on these Sierras. Go back and adjust the pedals to the same position (first button on drivers side) I adjusted mine out a good bit yesterday (i guess they were all the way down) and it is night and day with gas pedal throttle response being much better. (one of my main complaints) Does not seem like logical that it should make a difference but it does,....... might be an issue with their drive by wire system just not sure... Difference in mileage from truck to truck could make a slight difference if one transmission has learned a little more than the other one. I do not see the wheel size being a big difference maker there is something else going on.

I'm telling you if there is upwards of 10 lbs+ difference on each corner from 20 to 22" (which seems entirely plausible given the tires alone are 5 lbs heavier) you WILL feel a difference initially off the line. My buddy's '15 denali 6.2 w/ 22"s felt slower than my 6.2 AT, at the time I chalked it up to a faulty tranny he always complained about (which is why he was making me drive it - but TBH I didn't notice the tranny acting weird) but now that I did some research on the tire weights plus seeing this thread it would make sense that the increased unsprung weight coiuld easily be the culprit.

blackout07 Senior Enthusiast

blackout07

Posted
Posted

How much do these trucks weight? 4500-ish lbs? And there's roughly a 10lb difference per corner in weight between 20s and 22s, so I'm sure there's some difference in acceleration but I just can't see it being noticeable with the seat test in these things. The only place I could see this mattering is on the track.

15silver Enthusiast

15silver

Posted
Posted

more importantly what was the difference in diameter ... 22 with a lower profile may have the same diameter as the 20 - and therefore not really be a factor.

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