Originally Posted by ajs800
How will it "easily" outrun the MDX when the MDX posts quicker times? The MDX runs a slightly better 0-60 time and is around the same in the qtr mile as the Hemi.
My previous vehicle had the same engine as the MDX in a FAR lighter vehicle. It felt quicker than the Jeep by a lot, but in reality it isn't. And that engine you had to rev the bejeezus out of to get it to move the thing up a hill. THe Jeep's V8 doesn't break a sweat.
The new 5.0L DI V8 in the RR Sport is a hugely awesome engine. It's rather unfair to compare a 400+ hp, very advanced engine like that to the Hemi. If you compare it to their previous V8, the Hemi wipes the floor with it. In terms of performance, the Jeep is a decent bit faster than the previous RR Sport and about equal to the previous RR Sport Supercharged.
That said, Chrysler builds in a huge amount of torque management to the programming of the PCM. Almost all domestics do nowdays. That's why you can look at the GL450 and the Durango R/T and the GL450 is faster in all measureables than the R/T despite being heavier with less power. It's not the number of gears, it's the fact that they're cutting out a lot of power in low gears, before gear changes, and purposefully slowing the gear changes down - all things that are ostensibly done to reduce warranty costs.
I expect that the new transmissions will make the issue worse if anything, it's unlikely they will reverse course on the TM. The transmissions in the Jeep now are also found in the Ram pickups, so they're capable of holding up to abuse. With an outside transmission that will be their first use of it, I don't see them going with any less TM than before, if anything it will increase to reduce chances of having to eat warranty costs. Thus with more gear you'll have more gear changes, and more times that TM will rear its ugly head.
And the 5 speed tranny IS
the 6 speed tranny. There is no difference, it's just a marketing change. The "5 speed" has technically always been a 6 speed, it has a secondary kickdown gear it doesn't usually run through, so when you're in 5th you're really in 6th. The "6 speed" just has a name change and a software change to allow you to manually access it via autostick or paddles, but AFAIK it still won't use that gear when you've just got it in drive and let it shift itself.