7AT, 7th gear: Cruising or Top Speed?

nmjaxx9 · 01-30-2013, 08:57 PM

F that 7th is my highway gear.

UNKNOWN_370 · 02-28-2013, 06:57 AM

Quote:

Originally Posted by isayimandrew

thats what i was gonna respond with. the last gear for a 6MT or 7AT is an overdrive gear for gas purposes. You could technically go without using those gears and still be fine.

Small correction. Both 6th and 7th gears in the 7AT are both overdrives. Done for improved gas mileage. But I don't see any improvement from the VQ35 5AT, at all.

wstar · 02-28-2013, 08:53 AM

It's actually a much-improved transmission over the 5AT, there's some technical whitepapers out there from Jatco (the mfg of both). Mostly it's about improvements to the shifting speed/firmness, the downshift rev matching, and the full lockup stuff. For a fluid-drive true auto, it's really one of the best units out there. It's almost good enough to be a poor man's DCT/PDK type thing (which is what I used it for), but obviously a real DCT would be better.

6 and 7 are definitely cruising overdrive. Even 5th doesn't have a lot of umph, and I'd call it an "overdrive" too at the 7AT's rear end ratio, although if you plan to be full in the throttle past ~120mph you'll need to accelerate in 5th as well.

Z eliminator · 02-28-2013, 10:31 AM

In 5th it will red line the 155 mph before you hit 7500 rpm on the dyno.
2800 rpm @ 100 kms with the 4.08s
z

UNKNOWN_370 · 02-28-2013, 10:47 AM

Quote:

Originally Posted by wstar

It's actually a much-improved transmission over the 5AT, there's some technical whitepapers out there from Jatco (the mfg of both). Mostly it's about improvements to the shifting speed/firmness, the downshift rev matching, and the full lockup stuff. For a fluid-drive true auto, it's really one of the best units out there. It's almost good enough to be a poor man's DCT/PDK type thing (which is what I used it for), but obviously a real DCT would be better.

6 and 7 are definitely cruising overdrive. Even 5th doesn't have a lot of umph, and I'd call it an "overdrive" too at the 7AT's rear end ratio, although if you plan to be full in the throttle past ~120mph you'll need to accelerate in 5th as well.

I agree... but im not seeing the improved mileage... period. So they didnt achieve that. extra gears didnt help.

bdavis89 · 02-28-2013, 10:53 AM

Does anyone know why they didn't make the ratios longer? Wouldn't you ideally shift into 7th around 60 or 65, that way your rpms would be under 2k at 75, thus getting even better gas mileage?

DEpointfive0 · 02-28-2013, 11:14 AM

Quote:

Originally Posted by bdavis89

Does anyone know why they didn't make the ratios longer? Wouldn't you ideally shift into 7th around 60 or 65, that way your rpms would be under 2k at 75, thus getting even better gas mileage?

I don't get the bolded part, I mean you can shift into 7th at 42MPH.

I agree, especially when you have 7 gears... It's a joke... It should be so
Slow that it's barely above idle, just so the engine doesn't sputter and die, lol

I REALLY wish our cars had a little ball, or switch behind the gas pedal, so just in case you were in tiptronic and you needed to floor it, it would automatically shift ALL the way to the lowest gear possible. Maybe put that as a feature in place of the SRM button on the sport package? (Just off hand, BMW's, my Maxima, and the Porsche's I have driven have it)

bdavis89 · 02-28-2013, 11:27 AM

Quote:

Originally Posted by DEpointfive0

I don't get the bolded part, I mean you can shift into 7th at 42MPH.

I agree, especially when you have 7 gears... It's a joke... It should be so
Slow that it's barely above idle, just so the engine doesn't sputter and die, lol

Sorry. I meant make 65mph the earliest shift point for 7th, instead of the 42mph. Surely they know highway speeds are 70+, so it would be logical to have the cruising gear to only be accessed once you hit 65, thus allowing for the lowest rpms at highway speeds.

DEpointfive0 · 02-28-2013, 11:29 AM

( Click to show/hide )

Yep, sorry, I misunderstood the logic when I first read it

02-28-2013, 08:53 AM	#18 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	It's actually a much-improved transmission over the 5AT, there's some technical whitepapers out there from Jatco (the mfg of both). Mostly it's about improvements to the shifting speed/firmness, the downshift rev matching, and the full lockup stuff. For a fluid-drive true auto, it's really one of the best units out there. It's almost good enough to be a poor man's DCT/PDK type thing (which is what I used it for), but obviously a real DCT would be better. 6 and 7 are definitely cruising overdrive. Even 5th doesn't have a lot of umph, and I'd call it an "overdrive" too at the 7AT's rear end ratio, although if you plan to be full in the throttle past ~120mph you'll need to accelerate in 5th as well. DEpointfive0 likes this. __________________ 7AT Track Car! Journal thread / Car setup details

02-28-2013, 10:31 AM	#19 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,659 Drives: 370 Z 7AT Sports Rep Power: 19	In 5th it will red line the 155 mph before you hit 7500 rpm on the dyno. 2800 rpm @ 100 kms with the 4.08s z DEpointfive0 likes this. __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

02-28-2013, 10:53 AM	#21 (permalink)
bdavis89 Track Member Join Date: Oct 2011 Location: Jacksonville FL Posts: 586 Drives: '10 370Z PW Auto Rep Power: 15	Does anyone know why they didn't make the ratios longer? Wouldn't you ideally shift into 7th around 60 or 65, that way your rpms would be under 2k at 75, thus getting even better gas mileage? kidkotic2001 likes this. __________________ 2010 Pearl White Touring Sport Package \| Navigation \| 7 Speed Automatic

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01-30-2013, 08:57 PM	#16 (permalink)
nmjaxx9 A True Z Fanatic Join Date: Jul 2011 Location: Middletown, Ct Posts: 5,853 Drives: 2011 Nissan 370z Rep Power: 26	F that 7th is my highway gear.