2015 Nismo 7AT Shift Quality

IAmTheStig · 04-02-2015, 09:27 PM

Disclaimer: Please do not turn this thread into an AT vs. MT thread; I think we've all wasted enough time on that topic.

Okay, so to my question; I am a proud owner of a '14 base sport 7AT and really love it. I would like to know if anyone has experience in the new '15 Nismo 7AT, and could provide any insight into if Nissan has changed any of the shift characteristics from the base model.

- Does it feel any different than the older non-Nismo 7ATs?
- What about when using the paddles?
- Has it been recalibrated at all in this new application?

Really looking forward to hearing from the people who have driven both.

BTW, I know all about the trans tuning that can be done to quicken the shifts if needed, just interested in how the stock tunes compare in the thread.

Thanks!

UNKNOWN_370 · 04-02-2015, 11:05 PM

It's a 3.6 gear ratio vs the normal 3.36. Haven't test driven it yet.

Chan Chee Hoe · 04-03-2015, 01:50 AM

Quote:

Originally Posted by UNKNOWN_370

It's a 3.6 gear ratio vs the normal 3.36. Haven't test driven it yet.

Meaning lower revs at let's say 100km/h[62mph].?

Davey · 04-03-2015, 07:16 AM

Quote:

Originally Posted by Chan Chee Hoe

Meaning lower revs at let's say 100km/h[62mph].?

No, higher. The higher the number, the higher the revs at a given speed, that's a simple rule of thumb, so for example a 3.0:1 gear would have a lower RPM at a given speed vs. a 4.0:1 gear.

Allentown · 04-03-2015, 09:42 AM

How hard is it to change the ratio? In the mustang it was just a drop in part in the rear differential, about $300 to $400.

Will help mpg down low if you drive in town all day, but will hurt highway mpg. Also with this system it could have some wonky effects on the shift points (wasn't an issue on the stangs but i dont know about the z)?

JWillis72 · 04-03-2015, 11:38 AM

I wouldn't think at nearing the end of production they would change it for basically the same HP and if they did I'm sure they would be advertising it.

Chuck33079 · 04-03-2015, 12:02 PM

Quote:

Originally Posted by JWillis72

I wouldn't think at nearing the end of production they would change it for basically the same HP and if they did I'm sure they would be advertising it.

They did. It's one of the changes they made on the '15 Nismo.

Davey · 04-03-2015, 12:09 PM

Quote:

Originally Posted by Allentown

How hard is it to change the ratio? In the mustang it was just a drop in part in the rear differential, about $300 to $400.

Will help mpg down low if you drive in town all day, but will hurt highway mpg. Also with this system it could have some wonky effects on the shift points (wasn't an issue on the stangs but i dont know about the z)?

It's not really a drop-in part. It requires some skill to set the clearances properly so it doesn't whine like a school bus. The labor can get expensive.

If I were going to change the rear end ratio, I'd get the most bang for my buck and add a real LSD at the same time.

JWillis72 · 04-03-2015, 12:14 PM

Quote:

Originally Posted by Chuck33079

They did. It's one of the changes they made on the '15 Nismo.

They change how the 7At shifts? What did they do?

Chuck33079 · 04-03-2015, 12:28 PM

Quote:

Originally Posted by JWillis72

They change how the 7At shifts? What did they do?

No, they changed the rear end ratio.

UNKNOWN_370 · 04-03-2015, 01:42 PM

Quote:

Originally Posted by JWillis72

I wouldn't think at nearing the end of production they would change it for basically the same HP and if they did I'm sure they would be advertising it.

Not sure you noticed, but Nissan does very very little advertising for the Z. In 2011 they changed spring rates and the only reason why i know is because my dealerships GT-R mechanic showed me off the 2010 and 2011 spec sheets. Otherwise....
Who knew spring rates changed from 10 to 11?

critical · 04-03-2015, 03:00 PM

buy a manual pumpkin and swap it in

IAmTheStig · 04-03-2015, 03:44 PM

So... Same transmission calibration other than what is required to use a different rear diff ratio?

critical · 04-03-2015, 06:34 PM

Quote:

Originally Posted by IAmTheStig

So... Same transmission calibration other than what is required to use a different rear diff ratio?

i'd guess so

you don't really have to change anything to make it work, but they probably did some minor tweaks. you'd have to use uprev to take a look and compare i'm guessing.

Chan Chee Hoe · 04-03-2015, 07:40 PM

Quote:

Originally Posted by Davey

No, higher. The higher the number, the higher the revs at a given speed, that's a simple rule of thumb, so for example a 3.0:1 gear would have a lower RPM at a given speed vs. a 4.0:1 gear.

That is no good,i always find the car crusing @100 km/h[62mph],at 2000rpm,a tad too high,most cars now only 1700 rpm at the same speed to save fuel.

04-02-2015, 09:27 PM	#1 (permalink)
IAmTheStig Base Member Join Date: Feb 2014 Location: Michigan Posts: 50 Drives: 2014 370z Coupe Rep Power: 11	2015 Nismo 7AT Shift Quality Disclaimer: Please do not turn this thread into an AT vs. MT thread; I think we've all wasted enough time on that topic. Okay, so to my question; I am a proud owner of a '14 base sport 7AT and really love it. I would like to know if anyone has experience in the new '15 Nismo 7AT, and could provide any insight into if Nissan has changed any of the shift characteristics from the base model. - Does it feel any different than the older non-Nismo 7ATs? - What about when using the paddles? - Has it been recalibrated at all in this new application? Really looking forward to hearing from the people who have driven both. BTW, I know all about the trans tuning that can be done to quicken the shifts if needed, just interested in how the stock tunes compare in the thread. Thanks!

04-02-2015, 11:05 PM	#2 (permalink)
UNKNOWN_370 A True Z Fanatic Join Date: Jul 2009 Location: ny'r livn in tx Posts: 8,687 Drives: well over 130m.p.h. Rep Power: 14858	It's a 3.6 gear ratio vs the normal 3.36. Haven't test driven it yet. __________________ Favorite Quote. "I'm not gonna kill you... I'm just gonna Bash Your Face In" Jack Nicholson-"The Shining". 1980

04-03-2015, 03:00 PM	#12 (permalink)
critical A True Z Fanatic Join Date: Oct 2012 Location: Washington Posts: 1,252 Drives: 09' 370z 7AT Rep Power: 16	buy a manual pumpkin and swap it in __________________ Quaife w/ gears \|Stillen Gen 3\|SOLD FI Resonated Test Pipes \|SOLD FI 18'' \| 25row Stillen Race \| Progress 35mm/25mm sways \| Swifts/Koni\|Volk G25's\| Stoptech SS lines\|\|SPL Front/Rear Arms\| Last edited by critical; 04-03-2015 at 06:32 PM.

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04-03-2015, 09:42 AM	#5 (permalink)
Allentown Base Member Join Date: Mar 2015 Location: Georgia Posts: 34 Drives: 2015 Sport Tech Rep Power: 10	How hard is it to change the ratio? In the mustang it was just a drop in part in the rear differential, about $300 to $400. Will help mpg down low if you drive in town all day, but will hurt highway mpg. Also with this system it could have some wonky effects on the shift points (wasn't an issue on the stangs but i dont know about the z)?

04-03-2015, 11:38 AM	#6 (permalink)
JWillis72 A True Z Fanatic Join Date: Sep 2013 Location: Fort Myers FL Posts: 2,002 Drives: 2009 370Z yellow 7AT Rep Power: 45	I wouldn't think at nearing the end of production they would change it for basically the same HP and if they did I'm sure they would be advertising it.

04-03-2015, 03:44 PM	#13 (permalink)
IAmTheStig Base Member Join Date: Feb 2014 Location: Michigan Posts: 50 Drives: 2014 370z Coupe Rep Power: 11	So... Same transmission calibration other than what is required to use a different rear diff ratio?