They do have this car with the transmission upgrade: Link

yea i've seen that but still he never jumped into the higher gears and got on it. all i wanna know is if you can do what you cant do with this upgraded transmission. from what i understand is that you cant get on boost in the higher gears without issues.

also i want to know how much this transmission can hold. you'd think GTM would test the upper limits so they can let customers know.

i have one in my N/A car with 4.08 gears/
it shifts really hard and fast .
it was really quick at the drag strip ( bone crunching shifts at 7800 to 8000 rpm).
car ran slower but the 1/8 and trap speed where very high.
problem is that the uprev *car not tuned * closed the throttle body's on me when it shifted. and it stalled coming of the line. car ran way to rich.
the 4 to 5 shift is night and day different.
my stage 2 Sc will be going on soon.

430 hp 360 torque roadster.
gtm sc build

Any other upgrades to your transmission or engine?
Tranny cooler, oil cooler, VB upgrade, etc?

Do you guys think I'd have any issues running around 380-400 WHP for a few weeks before getting a trans cooler and valve body upgrade? By running, I mean driving hard.

In the higher gears probably...

What about 1-4?

Transmission cooler but thats it

I'm guessing the GTM kit is the go-to one? I found a Stillen kit, but the cooler looks a lot smaller.

ok dumb question but i know nothing about auto transmissions. what would i have to do to help the tranny handle the extra power.. i'm not looking for faster shifts or more responsive anything really, my tuner did fixed that issue. just so i dont have to buy a tranny in the future.

There's only so much you can do with the tranny. Cooler, valve body and upping the line pressure. The main issue seems to be that the clutch packs are just too small in 5/6/7. If you want it to hold power, call GTM and get ready to pay a pretty penny.

How is your tranny holding up currently? Any slipping?

From what I have read the Valve Body Upgrade-Cooler and staying out of boost on 5/6/7 should help to keep the tranny.

Zuperman_370

2009 370z 7AT GTM Stage 2 at 8PSI - 460HP & 348TQ

Added Zuperman to the list who has the above info along with a few more upgrades:


Hoping to add another owner soon to the list with a TT kit and 7AT who is currently being built in Houston. I believe he will have a stage 2 kit and VB upgrade along with a few other items.

Courtesy of G37sHKS and his current built motor & transmission thread, he posted a good article on Flexplate crack:

AGCO Automotive Repair Service - Baton Rouge, LA - Detailed Auto Topics - What Causes A Flexplate To Crack

My z just arrived at FI and ready for their TT!!
photo credit: fast intentions.
Attachment 75060
Attachment 75061

Cy is yours 7AT ?

If so what plans do you have to prep the tranny?

It is 7at, Trans cooler and VB for now. I'm their first 7at so they are gonna do some testing on my car. we'll see how it goes.

Congrats :tup:

That is awesome I think TT'd paddle shift car is just exotic!

Hope the best on your build... Keep us posted.

:thumbup::D

The stage 3 transmission which cost 4,576 is for 5AT it doesnt belongs here :tiphat:

Thanks, good catch. :tup:

Stage 4 tranny or bust lol :p

Hi, this week I will have installed GTM SC Stage 2 in my EU version of Infiniti M37S. After reading this thread I'm afraid about my 7AT reliability. I drive in the automatic mode the most time.

I'm not sure if 370z and my M37S have exactly the same 7AT with the same issues. In Infiniti M are also installed more powerful VK56VD and V9X engines and there are not issues with this transmission on the high gears.

Do you know if in my car is the same 7AT installed as in 370Z? Are any differences in 7AT related to engines with they are installed? For example, are 7AT exactly the same in G37 and FX50?

Should I think about transmission oil cooler and VB upgrade?

Staying out of boost on 5/6/7 and Trans Cooler / VB Upgrade are recommended from everything I have read.

Let us know how she runs... your feedback can always help others :)

Congrats on your Boosted Ride :driving:

So is the general consensus that we can't go high RPMs in 6th and 7th gear if boosted even with a good tune, trans cooler, and larger lines? Is it just those 2 or 5th also? Is this the case also with lower power numbers like a stage 1 SC kit? I want to SC, but I don't want to have to be worried about driving carefully or always knowing which gear I am in if I want to hit the gas (in auto mode).

I would imagine being SC is easier on the tranny as the tq builds gradually and doesn't peak nearly as high as turbo's do.

Yeah, but everyone is still saying to not gas it too hard in the higher gears even with SC. I'm just trying to get a feel for how this might impact my driving. Is 5th gear considered off-limits too? What is considered stepping on it hard? 4k, 5k+ or does it mean not to romp on it too quickly in those gears, but high RPM is okay if it's pressed gradually? It's a big investment so i just want to make sure I have all the facts. I do not want to have to be driving cautiously and always knowing my gear/RPM status all the time.

The flooring in high gears is just that,, Dont be cruising 5th 6th etc and jam it. But really if your WOT from 3rd-4? and shifting into 6th/7th your doing +140 an need to slow down anyway LOL

Please read the previous pages in the thread as it answers all your questions.

If you want to push it always have it in Manual Mode then and never Smash on it in 1st gear, and stay out of the High Gears 5,6,7 (Never Boost in those gear) just roll into them from the prior gears.

Sorry, but I am not sure what you mean by not boosting in 5,6,7. In a SC kit, I would always be boosted right? I am usually in auto mode so if I am cruising in 6th, 7th on the freeway and give it moderate gas (not flooring it, but a firm press and the RPMs go to like 5k, is that okay? I usually don't need to floor it or drop to 4th to pass. I'll press the gas firmly and it'll downshift on its own or I will drop to 5th and hit it a bit harder, but still not redlining it. The only time I come close to redlining is probably if I wan to accelerate aggressively and double drop down to 4th and hit the gas hard. Would I be safe with this driving style?

Yes should should be fine. I know I had no tranny issues. But I was alsomst never in 6th or 7th, Still now I really dont use those on the HYW. I always use manaul mode. Since the motor went in the car has never seen D.. :)

Guys, why the same 7AT transmission does not have issues on driving hard on 6,7 gears in M56 or FX50?

And I don't understand why we can not floor on 5,6,7 gear in D mode. Transmission will down to 3 or 4 gear.

And I don't understand why we can not floor on 5,6,7 gear in D mode. Transmission will down to 3 or 4 gear.[/QUOTE]

It will downshift, but if you floor it hard and it's not tuned/upgraded to downshift quickly, the RPMs will jump up pretty high before the downshift occurs which is where the risk is.

Is safe to accelerate in D mode on 5,6,7 gears not harder as on stock car? There still is not clear for me (and for others to) if we can accelerate on 5,6,7 gears but not hard or not.

Sometimes I drive on highways more then 200 km/h (125 mph) and I would like to accelerate from 0 to maximum speed i D (or DS) mode with transmission changing gears at 4-5k.

Your best bet is to call GTM with your specific questions. I can only relay what I have heard from them and others sicne I do not have one installed, just trying to gather info to make a good decision on whether to do it or not.

They use different transmission ;)

I found information about Jatco 7AT:

www.transakpp.ru

nice info, wish they had put the beefier one in the Z

Link for transmission and which car(s) from post 1 have what.
7-speed AT for medium and large RWD vehicles | JATCO Ltd

The M56 does have the same 7AT, it is the Nissan Fuga in Japan. The EX comes with the same transmission and the FX says it has a 7AT but still trying to find which version. The car was recently upgraded from the 5 to the 7AT but it just says "standard" transmission.