What were the trap speeds? That's the true indication HP. ET is more of an indication traction and driver skill. You could run a 14.9@98mph with a 2.6 60 foot or 14.3@98mph with a 2.1 60 foot. The only difference is 60 foot. It's hard to change trap speed unless you miss a shift. If the car's are within .5-1mph, then they're probably making close to the same average power.

 

Well not taking wheels into account I am sure the 6MT weighs less. And the 18" are not all that much heavier anyways. Not sure where everyone is getting the info that it weighs more? This is the first time I have heard that.

 

The 6MT weighs more than the AT.

 

-1 on that... so I think we're back at 4 now.

 

The JATCO 5AT is very compact and light. The TC is pretty small and it doesn't have the material denisity as the 6MT meaning it simply doesn't have all the moving thick metal parts. The 6MT has 7 main gears plus slider gears, shafts, hydraulic clutch system, 6 quarts of heavy gear oil, a dual mass flywheel, clutch and pressure plate, and thick reinforced case. It all adds up. The 5AT on the other hand is largely bands, lots of small clutches, a few gears, and lots of fluid. On paper and according to Infiniti, the 6MT weighs about 42lbs more than the 5AT. The same thing goes for the T56 in the Vette/F-Body. It weighs about 50lbs more than the 4L60E automatic.

 

I checked infinit.com and there is a difference but that is a 5at without aero.

G35 3,468 lbs (this is non aero with 17)
G35x AWD 3,650 lbs
G35 6MT 3,512 lbs (standard with aero with 18's?)

In Canada the 2005 6mt sedan is standard with aero. Is aero standard on the 6mt in the USA as well?

The 6mt comes with 18's which are a bit heavier and aero kit. The 5at comes with lighter 17's and non aero. So there is no offical proof that the 5at is lighter.

Taken from Infinit Canada:CAPACITIES AND WEIGHTS

Curb weight: 1579 kg (3,482 lb) / Aero Package: 1594 kg (3,516 lb)
http://www.infiniti.ca/en/models/05_...delCode=G4TG75

So I am not sure what proof the 5at is lighter? If you put the 18's and aero kit on a 5at it would be the same weight or even heavier than the 6mt.

IMO:
A well driven 2005 6mt will pull easily a 5at (both with the same rims) on a roll espeically on the highway (after 2nd gear and espeically 4th+). The weight is really not much a factor since it is so close and has yet to be proven. The 7200rpm fuel cut is sweet and the aero .26 drag coefficient shines in the top end! A 2005 6mt with light 17" ssr comps would be a nice set up for top end and help dramatically in the low end.

 

After checking out the 350z and G Coupe. It does look like th 5at is a bit lighter. ~40lbs. I am not sure if 40lbs makes any real big difference at these weights. I will take the extra 40lbs to get a 7200 fuel cut and more power under the curve up top. If a 6mt is launched right 3500-4000 with a little clutch feathering hit all the gears near fuel cut it will rock a 5at. And will keep pulling away right up to top speed.

 

I pretty much agree. From a dead stop, the 6MT should still be able to pull the 5AT by the end of the 1/4 mile, however that really is dependant on the 6MT driver's ability from 0-30mph.

I wouldn't say "rock" because the 5ATs as a whole pull better 60 foots. I've done 2.1s on EL42s. Most 6MTs are pulling mid 2.2s and a rare few have pulled 2.1s. Mount some slicks on the 6MT and the 5AT doesn't have a chance.....assuming the halfshafts can handle the 5000rpm clutch dump launch.

 

Thank you, Caroll Shelby!