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Forced Induction gains and 7AT

I've posted this in the "development" threads, and it doesn't get answered, so, here it is. I and a few others on here have the 7AT...how much power can those

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Old 09-24-2009, 09:42 AM   #1 (permalink)
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Default Forced Induction gains and 7AT

I've posted this in the "development" threads, and it doesn't get answered, so, here it is.

I and a few others on here have the 7AT...how much power can those handle before they pop?

I'm thinking of going with the GTM Twin Turbo setup, or, potentially a supercharger when one comes out.

But, if the tranny can't hang, then it'll be headers/HFC's/catback and call it a day (or maybe trade it in for a 6MT and lose my ***...)
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Old 09-24-2009, 10:11 AM   #2 (permalink)
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Good question! I wonder, too. I'm at that point now.....bolted myself to the max on my Z.....only FI left...if I decide to go there. I will consider the Cobb AccessPORT when they finally have it available and an ECU flash.

According to my last DynoDynamics numbers I was sitting at 307 whp....not bad....but I'd like to squeeze a lil more out, if possible.
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Old 09-24-2009, 10:30 AM   #3 (permalink)
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Quote:
Originally Posted by kannibul View Post
I've posted this in the "development" threads, and it doesn't get answered, so, here it is.

I and a few others on here have the 7AT...how much power can those handle before they pop?

I'm thinking of going with the GTM Twin Turbo setup, or, potentially a supercharger when one comes out.

But, if the tranny can't hang, then it'll be headers/HFC's/catback and call it a day (or maybe trade it in for a 6MT and lose my ***...)
The 350Z's AT was only good to about 400 to 420 RWH before mods were needed. I'd hope that the new 7AT handles more power. Another problem with the 350 AT was that when you went FI, the slower shift speed of the tranny would allow the RPMs to jump and hit the rev limiter when shifting under full acceleration. The fix was a throttle body upgrade on the tranny and/or a software change to the rev limiter level.
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Old 09-24-2009, 10:51 AM   #4 (permalink)
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The 350Z's AT was only good to about 400 to 420 RWH before mods were needed. I'd hope that the new 7AT handles more power. Another problem with the 350 AT was that when you went FI, the slower shift speed of the tranny would allow the RPMs to jump and hit the rev limiter when shifting under full acceleration. The fix was a throttle body upgrade on the tranny and/or a software change to the rev limiter level.
That shouldn't be an issue with the 7AT as the shift times are pretty quick.
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Old 09-25-2009, 11:44 AM   #5 (permalink)
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Originally Posted by kannibul View Post
That shouldn't be an issue with the 7AT as the shift times are pretty quick.
Pardon if this a dumb question.

Wouldn't the extra gear also be a factor to the amount of power the tranny can handle from a turbo??
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Old 09-25-2009, 11:47 AM   #6 (permalink)
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That shouldn't be an issue with the 7AT as the shift times are pretty quick.
Hopfully so. From what I've read, the full shift time has dropped about 500 milliseconds between the two trannys. That's an incredible improvement. I think the same 7AT is used in the FX45 (390 HP stock). If so, I'd imagine it's power handling has gone though the roof as well.
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Old 09-25-2009, 12:12 PM   #7 (permalink)
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Look on myg37.com you will find a pretty good answer there. But you can expect slightly more gains due to less power throuhg the drive train on the Z compared to the G.
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Old 09-25-2009, 12:14 PM   #8 (permalink)
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but I'd like to squeeze a lil more out, if possible.
Kinda hard to squeeze more out when you have to drive on a cushion
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Old 09-25-2009, 02:07 PM   #9 (permalink)
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Kinda hard to squeeze more out when you have to drive on a cushion



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Old 09-25-2009, 09:38 PM   #10 (permalink)
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how much power can those handle before they pop?
no one knows is why your not finding the answer. When one pops then youll have your answer. You could do the community a favor and TT your 7AT, push that boost way up until the tranny goes splat then we can all answer this question
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Old 09-26-2009, 10:30 AM   #11 (permalink)
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no one knows is why your not finding the answer. When one pops then youll have your answer. You could do the community a favor and TT your 7AT, push that boost way up until the tranny goes splat then we can all answer this question
Sure, if everyone on the forum donates a couple bucks to the cause for a replacement transmission, and can wait until the end of next year when I'll have the free money to buy a TT kit


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Old 10-13-2009, 07:02 PM   #12 (permalink)
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I know this is an old thread and I dont even own a 370z but this info may be relevant: Stock 2009 Infiniti FX50 S AWD Dyno Sheet Details - DragTimes.com

I believe your 7at is the same as in the fx 50 which appears to dyno at 329hp and 299lb-ft on a dynojet according to the above dyno chart. Torque tends to be more important then HP in transmission longevity so it stands to reason that if it can handle a stock 5.0l fx50 with 299lb-ft it probably has some engineered in cushion for more torque. Granted that was a dyno jet and not a mustang dyno..... hope this helps

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Old 10-13-2009, 07:35 PM   #13 (permalink)
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Well, given the torque of a stock Z is 269ft-lb, that leaves only about 10% gain before hitting that 299ft-lb transmission spec.

I assume there is some margin of "over-engineering" built in, but, how much?

I mean, we're only talking a fwe percentage points of increase before something could go pop.

10% seems "safe" in terms of torque gain. Will a supercharger do more than that - probably...it's only a gain of about 30ft-lbs.

I'm sure with bolt-ons people are seeing that much.
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Old 10-13-2009, 08:19 PM   #14 (permalink)
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I posted that same question and never got a clear answer. I suspect that someone will offer a package to build the tranny to sustain higher HP numbers.
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Old 10-13-2009, 09:27 PM   #15 (permalink)
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I would think the 7AT could handle 450whp easily, But thats just me



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