Hey gents, great thread. I’m currently planning to do something similar to my (thankfully still running perfectly well) 2016 GMC Yukon XL Denali 4WD currently at 124k miles, but with more forced induction!
Being the Denali trim my truck currently has the 6.2L L86 with AFM & DOD, but I’m either hearing lifters at idle or an exhaust leak, so it’s likely getting to be the time to dig into this thing before something mechanically unfortunate happens that leaves me stranded somewhere.
I’m also going to stay with the 8L90e; while I can appreciate the 6L90e (I had a 2012 CTS-V wagon for years) I prefer the driving dynamics of the 8 speed versus the 6.
There’s a few reasons I’m going to go likely with a supercharger; I live at elevation and despite naturally aspirated motors being inherently less complex, there’s no replacement for displacement AND boost!
My goals are a reliable ~700hp at the crank and that being transmitted reliably through the 8L90e (need some input on who builds ‘built’/stage-whatever 8 speeds?) as well as through the transfer cases and diffs. I like the Denali’s ability to either go into 4H/L or function as AWD, so I have no illusions as to the necessity of both dropping the L8T + boost agent in it as well as refreshing the rest of the driveline including reinforced driveshafts as I gather none of these trucks’ OEM drivelines appreciate either turning 75% more torque than factory or rotational speeds that come from a quarter mile.
Speaking of, not intending to do actual drag racing with the truck, but I want at my altitude something like high 12s and 110mph.
Anyway - anyone have any input on these new power adders intended for the L8T? Tempted to go with the 3.0L Whipple. I do tow on occasion and my goal is for the beast to be resilient enough to take any duty cycle I throw at it.
Here’s a pic of the truck as it sits. I put the 6-pot front Brembo RPO kit on it when I got it last year, the TE37 wheels, and a lowering kit to drop it a couple inches. Rides great (Magneride/magnetorheological shocks are my favorite thing GM does next to LS motors) and drives great.
Being the Denali trim my truck currently has the 6.2L L86 with AFM & DOD, but I’m either hearing lifters at idle or an exhaust leak, so it’s likely getting to be the time to dig into this thing before something mechanically unfortunate happens that leaves me stranded somewhere.
I’m also going to stay with the 8L90e; while I can appreciate the 6L90e (I had a 2012 CTS-V wagon for years) I prefer the driving dynamics of the 8 speed versus the 6.
There’s a few reasons I’m going to go likely with a supercharger; I live at elevation and despite naturally aspirated motors being inherently less complex, there’s no replacement for displacement AND boost!
My goals are a reliable ~700hp at the crank and that being transmitted reliably through the 8L90e (need some input on who builds ‘built’/stage-whatever 8 speeds?) as well as through the transfer cases and diffs. I like the Denali’s ability to either go into 4H/L or function as AWD, so I have no illusions as to the necessity of both dropping the L8T + boost agent in it as well as refreshing the rest of the driveline including reinforced driveshafts as I gather none of these trucks’ OEM drivelines appreciate either turning 75% more torque than factory or rotational speeds that come from a quarter mile.
Speaking of, not intending to do actual drag racing with the truck, but I want at my altitude something like high 12s and 110mph.
Anyway - anyone have any input on these new power adders intended for the L8T? Tempted to go with the 3.0L Whipple. I do tow on occasion and my goal is for the beast to be resilient enough to take any duty cycle I throw at it.
Here’s a pic of the truck as it sits. I put the 6-pot front Brembo RPO kit on it when I got it last year, the TE37 wheels, and a lowering kit to drop it a couple inches. Rides great (Magneride/magnetorheological shocks are my favorite thing GM does next to LS motors) and drives great.
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