Can Auto stock trans handle 500whp safely?

nomodsjk · 08-19-2014, 12:15 PM

OK cool. I already have the cooler and custom tune by r/t tuning and they definitely know their stuff. And I only plan to run it for a short while before building everything . thanks brother

FPenvy · 08-19-2014, 12:19 PM

Quote:

Originally Posted by nomodsjk

Our 7at trans is around 8gs bro so there is the hesitation

well if GTM was still a real company then they do a stage 4 tranny upgrade for 6500 i believe it was.

AAM and Fast Intentions are both currently working on 7AT upgrades for boost solutions.

a value body upgrade paired with your tranny coller should be ok for 500/350 or 500/400 numbers your looking for. but always remember every tranny is different and it could implode at anytime even with a VB upgrade and cooling.

theDreamer · 08-19-2014, 12:30 PM

The question is not about HP but TQ, the 7AT is very TQ limited and even worse in the 5-7 gears.
I would say, like others, pushing it much farther is a large risk. I would say that if you want more power to first focus on the transmission but on the subject of 500whp I am not sure the stillen SC can push much more out. It seems to be limited to about 450-475HP by others.

JWillis72 · 08-19-2014, 12:55 PM

I run mine up into 5th at full throttle on the straights. Even with tuning the 7AT the shift from 4-5th isn't great but I haven't had problems with it yet.

nomodsjk · 08-19-2014, 01:25 PM

Quote:

Originally Posted by theDreamer

The question is not about HP but TQ, the 7AT is very TQ limited and even worse in the 5-7 gears.
I would say, like others, pushing it much farther is a large risk. I would say that if you want more power to first focus on the transmission but on the subject of 500whp I am not sure the stillen SC can push much more out. It seems to be limited to about 450-475HP by others.

I really appreciate all the input guys. As far as the stillen kit I'm at 440 now and that's with some belt slips. I think with all my other mods if I got the impeller upgrade and cog pulley I would be very close to 500whp but I would be very happy at 475

nomodsjk · 08-19-2014, 01:27 PM

Anyone know about how much the impeller upgrade adds?

Amuse370z · 08-20-2014, 02:18 AM

Quote:

Originally Posted by DOOMMONKEY777

Dude brand new tranny(no homo) is like $1800 well manual at least.
And if i remember correctly it can hold up to like 600lb of torque. If it goes its cheaper to buy a new 1 anyways. But for automatics i dont know and its cheaper to buy a manual with "$-mode" and an extra pedal, when auto goes.

I wonder how much a shop will charge to do a tranny swap (no homo) and whether it will be reliable in the long run.

nomodsjk · 08-20-2014, 09:26 AM

Quote:

Originally Posted by Amuse370z

I wonder how much a shop will charge to do a tranny swap (no homo) and whether it will be reliable in the long run.

There is a company in new jersey that does a rebuild for 3,200$ but I can't remember their name. I had somebody tell me in a pm but I erased it when my pm box got full.

Amuse370z · 08-20-2014, 01:53 PM

Quote:

Originally Posted by nomodsjk

There is a company in new jersey that does a rebuild for 3,200$ but I can't remember their name. I had somebody tell me in a pm but I erased it when my pm box got full.

Not including the price of the transmissions?

EndyKwon · 08-20-2014, 02:16 PM

Quote:

Originally Posted by JWillis72

I run mine up into 5th at full throttle on the straights. Even with tuning the 7AT the shift from 4-5th isn't great but I haven't had problems with it yet.

Is there an issue with the 7AT shifting from 4-5 when its supercharged? I mean in my NA, I do find 4th gear very lacking (as far as power goes) but I never noticed the shifts being lacking.

I can't find myself full throttling from 4-5th without potentially getting myself a felony, maybe on the track but Streets of Willow only let me get to the top of 4th.

FPenvy · 08-20-2014, 02:23 PM

Quote:

Originally Posted by EndyKwon

Is there an issue with the 7AT shifting from 4-5 when its supercharged? I mean in my NA, I do find 4th gear very lacking (as far as power goes) but I never noticed the shifts being lacking.

I can't find myself full throttling from 4-5th without potentially getting myself a felony, maybe on the track but Streets of Willow only let me get to the top of 4th.

you say 4th gear lacks power?

i'll roll around in 4th sometimes and if i floor it i'm gone.

i'm NA and my only "issue" i've found is sometimes i'll get a throttle/rev blip when going from 4th to 5th when going full throttle and shifting at high revs.

EndyKwon · 08-20-2014, 02:45 PM

Quote:

Originally Posted by FPenvy

i'm NA and my only "issue" i've found is sometimes i'll get a throttle/rev blip when going from 4th to 5th when going full throttle and shifting at high revs.

Oh, that happens to me too. I always thought it was transmission slip. idk.

I might be spoiled with the power already on straightaways/highway onramps, of course on the canyon, it's got more than enough power. It just feels as if from 3rd to 4th the power is still there and then 4th to 5th, not so much. Hell, the FX35 that my old man drives has better feel from 4th to 5th.

Which I should note, it seems as if VQ37 holds back. It's as if the VQ35HR feels like it has more torque than the VQ37. Just my opinion though.

FPenvy · 08-20-2014, 02:47 PM

Quote:

Originally Posted by EndyKwon

Oh, that happens to me too. I always thought it was transmission slip. idk.

I might be spoiled with the power already on straightaways/highway onramps, of course on the canyon, it's got more than enough power. It just feels as if from 3rd to 4th the power is still there and then 4th to 5th, not so much. Hell, the FX35 that my old man drives has better feel from 4th to 5th.

Which I should note, it seems as if the VVEL from the VQ37 holds back. It's as if the VQ35HR feels like it has more torque than the VQ37. Just my opinion though.

the rev blip from 4th to 5th i feel is a ECU thing not the tranny actually slipping. i've heard it from many of the 7AT owners and i doubt every 7AT in the Z's are slipping lol

EndyKwon · 08-20-2014, 02:51 PM

Quote:

Originally Posted by FPenvy

the rev blip from 4th to 5th i feel is a ECU thing not the tranny actually slipping. i've heard it from many of the 7AT owners and i doubt every 7AT in the Z's are slipping lol

I always thought it was my 7AT being the odd one out, considering that I've taken it back and forth to the dealership for various issues. weird whistle noise, driveshaft clunk, windows going down when its supposed to go up, and etc. I still love my Z, but I was dead certain it was a quirky one.

Is there a way to tune the throttle blip so it doesn't happen?

JWillis72 · 08-20-2014, 02:58 PM

No that shift is much slower than the others even after tuning it.

08-19-2014, 12:15 PM	#16 (permalink)
nomodsjk Premium Member Join Date: Apr 2014 Location: martinsburg wv Posts: 2,073 Drives: 2011 370z MB/7at Rep Power: 19962	OK cool. I already have the cooler and custom tune by r/t tuning and they definitely know their stuff. And I only plan to run it for a short while before building everything . thanks brother KaienZ34 likes this.

08-19-2014, 12:30 PM	#18 (permalink)
theDreamer A True Z Fanatic Join Date: Feb 2009 Location: Texas Posts: 30,879 Drives: 370z Rep Power: 4210	The question is not about HP but TQ, the 7AT is very TQ limited and even worse in the 5-7 gears. I would say, like others, pushing it much farther is a large risk. I would say that if you want more power to first focus on the transmission but on the subject of 500whp I am not sure the stillen SC can push much more out. It seems to be limited to about 450-475HP by others. DEpointfive0 and JWillis72 like this. __________________ theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN theDreamer's Silvia // URAS // GREDDY Houston Zs // Facebook // Twitter // Instagram

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08-19-2014, 12:55 PM	#19 (permalink)
JWillis72 A True Z Fanatic Join Date: Sep 2013 Location: Fort Myers FL Posts: 2,002 Drives: 2009 370Z yellow 7AT Rep Power: 44	I run mine up into 5th at full throttle on the straights. Even with tuning the 7AT the shift from 4-5th isn't great but I haven't had problems with it yet.

08-19-2014, 01:27 PM	#21 (permalink)
nomodsjk Premium Member Join Date: Apr 2014 Location: martinsburg wv Posts: 2,073 Drives: 2011 370z MB/7at Rep Power: 19962	Anyone know about how much the impeller upgrade adds?

08-20-2014, 02:58 PM	#30 (permalink)
JWillis72 A True Z Fanatic Join Date: Sep 2013 Location: Fort Myers FL Posts: 2,002 Drives: 2009 370Z yellow 7AT Rep Power: 44	No that shift is much slower than the others even after tuning it.