Twin Turbo standard trans Vs auto

Monzy · 11-10-2012, 03:00 AM

Hello everyone,

I have bought a 2009 370z. It has some mod's to it but nothing to major. I want to do a twin turbo eventually, but I was curious if it is harder to do in an automatic trans than in a standard trans. If someone has done this in a auto let me know.

elperuano · 11-10-2012, 03:38 AM

It will cost u more money on AT cuz u gotta build tranny. MTs don't have that problem.

Wattles · 11-10-2012, 03:19 PM

Quote:

Originally Posted by Monzy

Hello everyone,

I have bought a 2009 370z. It has some mod's to it but nothing to major. I want to do a twin turbo eventually, but I was curious if it is harder to do in an automatic trans than in a standard trans. If someone has done this in a auto let me know.

Twin turbo on an auto can put a lot of strain on the auto that is built to handle only 330 - 350hp. You can easily get 600+ hp with a good TT setup and that will strain the stock tranny pretty good. This can lead to failure and/or costly repairs.
Many people choose to go with aftermarket trannys or upgrading the stock ones with new internals or valve body upgrade/line pressure increase to limit slippage thus reducing heat & wear. A transmission cooler can also help to keep wear down.
A major issue for auto transmissions versus manual is that virtually all of your shift will be at or near maximum torque and maximum turbo boost. This is in stark contrast to a manual transmission where you engage the clutch and lose boost pressure while shifting then build it again after the next gear has fully engaged. (Unless you are power shifting)
This reason alone causes massive stress on an auto transmission that is not a matter with manuals.

I have experience with my AT that even with a valve body upgrade I am still seeing some slippage in higher gear changes (4th and higher) but it performs very nicely with over 500whp on my IPL. The main question for me is how long will my trans last...
Good luck!

Legz · 11-10-2012, 04:07 PM

Well said Wattles! I have a 19 row tranny cooler and increased line pressure to support my tranny, but all the internal parts are stock. I haven't experience any slippage yet, but I never beat on gears 5,6,7. But I would actually prefer an MT on my TT G instead, but awds doesn't come with MTs.

tower74 · 11-10-2012, 04:08 PM

Quote:

Originally Posted by Monzy

Hello everyone,

I have bought a 2009 370z. It has some mod's to it but nothing to major. I want to do a twin turbo eventually, but I was curious if it is harder to do in an automatic trans than in a standard trans. If someone has done this in a auto let me know.

Well I have a single rear mount turbo and I've had zero issues with my transmission ( 481rwhp 427 tq). I have over 16,000 miles on the kit (20,000 miles on the car). If you are planning on boostin the hell out of the car everywhere you go or doing a ton of 1/4 mile runs then upgrade.
I might break it loose maybe once or twice a week and I never try to get it close to the red line. Of course with the AT7 it will not allow you to go over the red line limit. That's not to say I won't have problems in the future but I guess that's where a second vechile comes in handy.

show2nite · 11-10-2012, 08:44 PM

Quote:

Originally Posted by Wattles

Twin turbo on an auto can put a lot of strain on the auto that is built to handle only 330 - 350hp. You can easily get 600+ hp with a good TT setup and that will strain the stock tranny pretty good. This can lead to failure and/or costly repairs.
Many people choose to go with aftermarket trannys or upgrading the stock ones with new internals or valve body upgrade/line pressure increase to limit slippage thus reducing heat & wear. A transmission cooler can also help to keep wear down.
A major issue for auto transmissions versus manual is that virtually all of your shift will be at or near maximum torque and maximum turbo boost. This is in stark contrast to a manual transmission where you engage the clutch and lose boost pressure while shifting then build it again after the next gear has fully engaged. (Unless you are power shifting)
This reason alone causes massive stress on an auto transmission that is not a matter with manuals.

I have experience with my AT that even with a valve body upgrade I am still seeing some slippage in higher gear changes (4th and higher) but it performs very nicely with over 500whp on my IPL. The main question for me is how long will my trans last...
Good luck!

Milage with TT on your stock tranny?

ANMVQ · 11-10-2012, 09:08 PM

My tranny is fine with 450+ AWHP. But my motor is um, not. With a tranny cooler and get line pressure tuned it shifts perfect.

11-10-2012, 03:00 AM	#1 (permalink)
Monzy Base Member Join Date: Nov 2012 Location: santa ynez Posts: 19 Drives: 2009 370z Rep Power: 13	Twin Turbo standard trans Vs auto Hello everyone, I have bought a 2009 370z. It has some mod's to it but nothing to major. I want to do a twin turbo eventually, but I was curious if it is harder to do in an automatic trans than in a standard trans. If someone has done this in a auto let me know.

11-10-2012, 04:07 PM	#4 (permalink)
Legz Base Member Join Date: Nov 2009 Location: Calgary, AB Posts: 70 Drives: TT X coupe!! Rep Power: 15	Well said Wattles! I have a 19 row tranny cooler and increased line pressure to support my tranny, but all the internal parts are stock. I haven't experience any slippage yet, but I never beat on gears 5,6,7. But I would actually prefer an MT on my TT G instead, but awds doesn't come with MTs. __________________ GTM TT G37x coupe! Stage2 8.5psi Hotchkis \| GTSpec \| Eibach \| PLX \| Exoticspeed

11-10-2012, 09:08 PM	#7 (permalink)
ANMVQ A True Z Fanatic Join Date: Mar 2011 Location: Framingham MA Posts: 2,732 Drives: 2014 Q50 AWD Rep Power: 19	My tranny is fine with 450+ AWHP. But my motor is um, not. With a tranny cooler and get line pressure tuned it shifts perfect. __________________ 14 Q50 AWD, ARK, ECUTEK (SEB), Takda,

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11-10-2012, 03:38 AM	#2 (permalink)
elperuano A True Z Fanatic Join Date: Oct 2011 Location: Southwest FL Posts: 1,374 Drives: G37S Rep Power: 29	It will cost u more money on AT cuz u gotta build tranny. MTs don't have that problem.