It's all speculation.

Bottom line, I doubt there will be a huge difference one way or the other. If they can keep the weight down, the 7 speed should have a slight advantage.

When it comes to acceleration (and tranny's and gearing) there are a few factors.

1. Gearing (of course) and the 7 speed has an advantage.
2. Traction: This is very very tricky. Every car has a "sweet spot" for gears where the decrease in traction HURTS acceleration times. If "more is better" were always true, people would just get the steepest rear gear they can find and go with it.
3. Shifts: A lot of cars are HURT in 0-60 and 1/4 mile due to extra shifts. Perfect example: Mazdaspeed 3. It shifts into 3rd before 60mph. This definitely hurts the time compared to a similarly powered car that only shifts once before 60mph.

I'll say it again though, Bottom line, I doubt there will be a huge difference one way or the other.

 

Looking at those gear ratios, I'm a little disappointed. If the final drive ratio is the same, there will be little to NO improvement on fuel economy on the highway.

7th is only a 7% difference from our 5th gear. That means when we're doing 3000 rpm, the 7 speed will be doing 2780 rpm. Not much of a difference. This car should easily be able to cruise around 2200 at highway speeds with no problem.

 

I thought the current 5AT is at around 3250rpm while cruising at 80mph. 2200rpm at 80mph is way too low for this engine.

 

There will also be a 24 hp difference which is a greater increase in hp from the 1st gen to 2nd gen (293 vs. 306 using new sae figures). Lets not forget that even though the 5AT has less shifts, it shifts pretty damn slow compared to a lot of the better auto trannies out there. I bet this 7AT shifts faster than the 5AT so shifting more frequently doesn't necessarily translate into slow. It'll take advantage of the VQ's powerband better and will probably break 5 seconds to 60 and get fuel mileage to boot!

 

A 7AT might somewhat help acceleration, depending on how its geared compared to the 5AT. It's not going to be a huge different though.

And by the way, MT already got 0-60 in 5.2 & the 1/4 mile at 13.8 @ 103 mph on the 6MT.

.

 

I was talking about at 70mph.

And this car has plenty of tq to cruise at 70 at 2200 rpm. Just look at how easily it accelerates in 5th gear at 2200 rpm right now.

Waiting to hear on the final drive though. That'll determine what the real ratios are.

 

There's no reason to believe the 7 speed will shift faster than the 5 speed. FWIW, the 5 speed shifts quite fast for a "regular" automatic.

Again, it's all speculation. We don't even know if we're getting the 3.7 liter engine. And if we do, we don't know what the power rating will be.

Just comparing the 7 speed vs. 5 speed tranny, it may or may not be faster.

My guess: .1 second better in 0-60 and 1/4 mile. And 1 mpg better.

Aren't there stats for the G37 sedan in Europe yet though?

 

When all you have to do is keep the gas pedel mashed to the floor, there isn't any signficant "lag" to speak if.

Posting the gear ratios is the smartest thing anyone did in this thread

 

2nd smartest once someone will post the final drive ratio.

 

Also remember that the G37 Coupe is slower by a tenth or two to start with. That engine will now be in the sedan. The 7AT will likely make up for some of that but I dont anticipate the new sedan being much faster.

 

it's slower cuz it is heaver, not because of the motor. It's like 150 pounds heaver then the sedan

 

Anyone got the final drive ratio or some specs from Europe yet?

 

Let's just wait for it to come out first... ya?

 

i agree, lets wait, we can do this all day.

on a side note, does any one honestly care if its 1/10th faster. i mean can any one honestly feel the difference, i doubt it

i guess its more bragging rights then any thing, but just cuz the car can do it, doesn't mean the driver can

 

Agreed, but is the 3.7 the source of some of that extra weight?