NemesisC5

My comments in RED should not have included reference to 5000 lbs, what I meant to bring attention to was the noteworthy performance of the transmission shift performance. Almost every time I post in a 2014 thread I give props to the tranny and when I read the comment in the article about how well it shifted even when hauling a load I blew mine

LANCE ATKINSON

iTrader: (8)

Ok Im finding very different info on the flex fuel 6.2DI!! One site says it is then another says no. In my opp I think it will and that will differ from the LT1!! Just my thoughts though. Theres no way GM is gonna put an engine out that requires 92 octane only this day n time hence one of the reason for DI bn able to make more power because of better atomization of fuel bn sprayed under pressure!! I would think you could get away with less octane at higher compression with Direct Injection!! The injectors are set at 96lb in the tune also so lack of fuel system wont b an issue here!! Just my thoughts!!

Robert91RS

iTrader: (2)

All the signs pointed to a flex fuel 6.2, and still do, but GM has repeatedly stated its not and I have no idea why. My hope is that the cost were to high to get it E85 approved right away or that perhaps they just ran out of time to finalize tuning/emissions before its release.

GM has even gone as far as creating an RPO for E10(FHO) & E85(FHS) capable trucks, which only reinforces the notion that at one time GM had planned the whole line of engines to be flex fuel IMVHO.

Robert91RS

iTrader: (2)

I just found a message from GM stating the new L86 6.2 uses 3" exhaust rather than the 3.5" on Gen4 motors. Not ground breaking or deserving of its own thread but I thought you all might find that interesting and perhaps helpful if you're planning an aftermarket exhaust.

NemesisC5

Great info Robert, I have been looking hard at the tailpipes in every picture of LTZ or High Country pictured looking for something that stands out. I know the exhaust on 5.3L is 2.75" not sure why they wouldn't just put a 3" on those as well. I know attention was put into the exhaust so that they would not sound sick or drone when in 4 cylinder mode and for sure I know the 6.2 has a butterfly valve in the muffler to help sound quality. Maybe this has much to do with tuning the exhaust note for cylinder deactivation.

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The intake, the exhaust, the fuel and ignition mapping, the lubrication, and other ancillary components have been optimized for truck duty, though, resulting in smooth, refined power delivery that doesn’t announce its arrival with an overly obnoxious exhaust note. Sure, there is the provocatively named “exhaust flapper,” a bypass valve that lets the V-8 speak up under heavy throttle and while performing feats of towing strength, but it otherwise has no audible giveaways to its 420 horsepower and 460 lb-ft of naturally aspirated grunt. Indeed, both trucks are equipped with active noise cancellation when ordered with the 6.2-liter engine, to reduce annoying rumble when cruising and at low engine speeds.

black01_WS6

iTrader: (13)

I was going to throw a 6.2 exhaust on my 5.3, as a friend is getting a 6.2 and will be ordering an exhaust/intake/tune when available.

I plan on doing the same, but on a little lower budget- I'm just glad I can finally afford a new truck.

Robert91RS

iTrader: (2)

Before and after dyno sure would be cool. Then we'd all know if its worth the money and time on these trucks. I didn't realize the 4.5/5.3 only had 2.75" exhaust.

8UALIVE

iTrader: (2)

Well our dealership has got a new denali in and I think Lance is gonna go test drive it. Sticker is only 54k which is a lot cheaper than what I was expecting!! A guy sent us a video of the speedo and had to put it in 4wd to take off because it blew through first gear!! But the 4wd video, it's gonna fly!! Especially with a tune!! It looks as if it runs about the same as my tuned one in second gear on! Anxious to see what Lance says about it! Maybe we can update this afternoon.

bigsapper

iTrader: (2)

The Denali is a 6.2?

If so, please confirm if E-85 compatible.

8UALIVE

iTrader: (2)

Yes it's a 6.2 and will check on e85....