Nissan 370Z Forum
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Nissan 370Z Forum (http://www.the370z.com/)
-   Forced Induction (http://www.the370z.com/forced-induction/)
-   -   Forced Induction & 7AT 370z Info (http://www.the370z.com/forced-induction/66263-forced-induction-7at-370z-info.html)

J_Z 07-24-2013 12:57 PM
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.

Chuck33079 07-24-2013 01:05 PM
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.

blueranger 08-04-2013 01:00 AM
Quote:
Originally Posted by J_Z (Post 2417038)
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.
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.

theDreamer 08-19-2013 07:28 AM
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:

Quote:
Originally Posted by zuperman 370
Year 2009 7AT
Kit GTM stage 2
Current hp TQ 460 hp/348 tq on 91 oct
PSI 8 ( smaller pully used for stage 1.5)
Mil since install app 5k miles
other upgrades, GTM tran cooler, gtm stage 4 full transmission upgrade

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.

theDreamer 08-19-2013 07:35 AM
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

Quote:
Slight misalignment may only cause a single flexplate to break in the life of the vehicle. More severe misalignment can break a flexplate in 15,000 to 30,000 miles. Excessive crankshaft flange run-out or end plate can also cause flexplate cracking. This may occur in worn engines or engine that have been poorly rebuilt. An engine, transmission or torque converter that has been dropped may also have damage that will cause misalignment.

When a running engine ingest water or coolant, the crankshaft may be bent. Liquids will not compress and immense force is placed on the crankshaft and rods. This sometimes happens with a leaking intake manifold or driving on a flooded street. The bent crankshaft will have run-out at the flange and may have continued problems with flexplate cracking.

The same things that cause the flexplate to crack can also cause transmission problems. Damaged and leaking front seals and front transmission pumps are common symptoms.

When a flexplate cracks, it often produces a loud knocking noise as it rotates. The sound is very similar to a bad engine rod and is often misdiagnosed. Removing the bolts to the torque converter and sliding it back into the transmission will often reveal the real problem.

cycy89 08-19-2013 02:27 PM
2 Attachment(s)
My z just arrived at FI and ready for their TT!!
photo credit: fast intentions.
Attachment 75060
Attachment 75061

blueranger 08-20-2013 11:46 PM
Quote:
Originally Posted by cycy89 (Post 2452622)
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?

cycy89 08-20-2013 11:51 PM
Quote:
Originally Posted by blueranger (Post 2454472)
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.

blueranger 08-21-2013 10:16 PM
Quote:
Originally Posted by cycy89 (Post 2454475)
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.

cycy89 08-22-2013 04:22 AM
Quote:
Originally Posted by blueranger (Post 2455923)
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

G37sHKS 08-22-2013 10:05 AM
Quote:
Originally Posted by theDreamer (Post 2138280)
The stage 3 transmission which cost 4,576 is for 5AT it doesnt belongs here :tiphat:

theDreamer 08-22-2013 10:12 AM
Quote:
Originally Posted by G37sHKS (Post 2456417)
The stage 3 transmission which cost 4,576 is for 5AT it doesnt belongs here :tiphat:
Thanks, good catch. :tup:

FPenvy 08-22-2013 10:12 AM
Stage 4 tranny or bust lol :p

grabba 08-25-2013 02:44 PM
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?

blueranger 08-25-2013 10:02 PM
Quote:
Originally Posted by grabba (Post 2460777)
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? 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:


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