Forced Induction & 7AT 370z Info

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

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

My z just arrived at FI and ready for their TT!!
photo credit: fast intentions.
uploadfromtaptalk1376940392059.jpg
uploadfromtaptalk1376940408717.jpg

blueranger · 08-20-2013, 11:46 PM

Quote:

Originally Posted by cycy89

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

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

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

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

Congrats

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

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

:thumbup:

G37sHKS · 08-22-2013, 10:05 AM

Quote:

Originally Posted by theDreamer

TRANSMISSION COOLER - $400
GTM Stage 3 Transmission Upgrade - $4,576
GTM Stage 3 Transmission Upgrade - $5,397
GTM Stage 4 Transmission Upgrade - $6,773

Add core charge: $2,000-$2,500

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

theDreamer · 08-22-2013, 10:12 AM

Quote:

Originally Posted by G37sHKS

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

Thanks, good catch.

FPenvy · 08-22-2013, 10:12 AM

Stage 4 tranny or bust lol

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

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

07-24-2013, 12:57 PM	#91 (permalink)
J_Z Base Member Join Date: Dec 2011 Location: tempe az Posts: 27 Drives: 2011 370z Roadster Rep Power: 13	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. __________________ invidia cbe, berk hfc, gtm sc, passport, stillen front fascia, nismo oil cooler, z1 struts,

07-24-2013, 01:05 PM	#92 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29538	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. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

08-19-2013, 02:27 PM	#96 (permalink)
cycy89 A True Z Fanatic Join Date: Jun 2011 Location: 120mph somewhere Posts: 1,097 Drives: #TTURBOZ Rep Power: 29	My z just arrived at FI and ready for their TT!! photo credit: fast intentions. uploadfromtaptalk1376940392059.jpg uploadfromtaptalk1376940408717.jpg Mr&Mrs likes this. __________________ Fast Intentions Twin Turbo Kit GT2860RS, 677WHP\|FI 34 row oil cooler\|F.I. CBE\|Fast 500E return fuel system\|FI trans cooler\|FI billet aluminum flex plate\|Excedy clutch packs\|ENKEI RP03\|BC BR coilovers\|SEIBON Carbon\|EVO-R Rear fog light\|GTR push start\|Whiteline sway bars, Diff bushing\|DSS axles\|ECUTekW/FlexFuelTune

08-25-2013, 02:44 PM	#104 (permalink)
grabba Base Member Join Date: Mar 2013 Location: Toruń, Poland Posts: 21 Drives: M37S GTM S/C Stage 2 Rep Power: 12	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? Last edited by grabba; 08-26-2013 at 05:28 AM.

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