How do I get 400whp reliably in 7AT 2011 370z
 

How do I get 400whp reliably in 7AT 2011 370z

Once you modify a stock factory setup, reliability goes out the door.

GTM supercharger?

So far, you can't.

You'll need boost and the jury is still out on whether or not the stock trans can handle it without a rebuild.

What about the transmission?

To the best of my knowledge, at least two boosted 7AT's have failed. Whether those failures were due to tuning (e.g., shift firmness can be tuned) or mechanical limitations (i.e., gears simply failing from over power) remains unclear.

My advice would be to call GTM, do some searching, and spend lots of time thinking and considering before proceeding.

Good luck!

P.S.

You can get it to 300 whp pretty easily tho -- check out my dyno thread. Search for Proven Power.

EDIT: There, happy? Nothing misleading here.

although you wont increase power, the most "reliable" way to increase performance (assuming thats what youre going for) is to take the car on a diet...

you can easily get this car down to 3200lbs w.o loosing ALL of the goodies. Its a lot easier for 300whp to move a 3200 lb car than a 3500lb car

new seats
no spare tire
lighter battery
no hardware
ligher exhaust
lighter wheels
some carbon fiber body peices...
lighter rotors

those are just some of the easier ones

I believe all you have to do is add a manual transmission and Miata doors...:p

The former don't matter :p

The quote below is part of the UNTRUTH being spread on this forum. ONLY 1.....yes 1.....7AT has failed so far and it was on an SC install. It belonged to member shumby and he was a very early adopter of FI. I have talked to him through email and he has stated that his install WAS BEFORE they knew they could tune the tranny on the 7AT. His car was also very high miles before the install. I have been running 490rwhp on a twin turbo setup on my 370 7AT for over a year with no MAJOR issues. Sam@GTM would be the best person to talk to on this subject. BE AWARE that the 6MT guys will bash this tranny and will tell you cautionary tales that are not true. Many people on this forum are running 400+ hp on their 370 7AT's.

Tiger blood.

and Shumby failed to install the Miata doors as well....

To Blue370tt:

Eat my ***:

Confirmed 7AT failures:

1. Shumby

2. this guy
http://www.the370z.com/forced-induct...t-believe.html

Unconfirmed:

1. One identified by a tuner in my area -- I'll allow that this is hearsay.

2. And I thought at least one other on here -- anyone???

If we go only with the confirmed failures on here, there are two. How many people have boosted their 7AT's? 5? 6? Let's assume 6 -- that's 2/6 or 33% failure rate. Let's pretend it's 10 -- that's a 20% failure rate.

If there's less than 100 people boosted I want to know what the fvck went wrong before I risk destroying my new car. The failure rate is way too high.

People can take whatever risks they want with their own car, but speaking only for myself, until the reason for the failures and a reliable solution is clarified, I'm holding off on boost.

Thanks :tiphat:

I prefer to err on the side on caution for a brand new 30K + car...

EDIT: Okay, so WHY did the others fail and why is it that yours has held up?

Don't be a smart *** -- if you have no idea, then all you can do is say that yours hasn't failed! That's great -- I certainly don't wish it to, but why should your positive experiences be given more weight than the negative experiences of others?

If we don't know, then "the jury is still out" is a totally fair assessment.

If there are 10 boosted 7AT's and 2 failed, that's still 20% failure rate! That's ******* high! I want to know how to avoid that before I lay down several grand, thanks.

Jeez.

P.S.
If yours eventually fails will you post an apology? Don't disreagrd the failure rate just because yours has held up -- and I hope it does -- but your sucess story doesn't make the failure stories any less serious.

:argue::barf::facepalm::woot:

More Bull crap.......guy #2 is in thailand and no one could ever really tell what he had done. YES, the suspicion is that he had a stillen SC, but that was never determined. Your use of this is another great example of people taking 1.....yes ONLY ONE......failure and trying to kill the 7AT transmissions rep. I talked with Shumby by email and his SC install was AFTER many miles (over 70,000). Anyone with a brain knows that putting ANY FI situation on a high miles car is probably going to lead to some kind of failure.

UNTIL WE HAVE ANOTHER VERIFIED 7AT FAILURE YOU CAN JUST STOP......PLEASE STOP! Some noob on this forum is going to run with your bull and these UNTRUTHS will just continue.

I have done EVERYTHING in my power to protect my tranny, but, if it does fail, I wont shy away from letting everyone know. As hard as I push my car DAILY, I woould think it would of happened by now. Its been OVER a year and its still fine.

I have a 370Z TT 7AT, but not here in my hand. He's on the port of PE/Brazil, and I get he on this month. He's tuned by AAM Competition.
I'm anxious to take this car.
(Sorry my bad english).
Some informations of the car:

Nissan 370Z, 7AT, 2011, Twin Turbo, 450whp.

Vídeo:

OP you have a 2011 Nismo and your asking about a Auto trans?..i say roll the dice like everyone else and SC it..haha

Whatever.

70K is nothing. That's absurd. Why would you presume that 70K on the trans means it was going to be more prone to fail.

Does that mean if you have 25K on the car, expect it to fail in the next 3-5 years? That's not an explantion anymore than "driver error". Tell me exactly what failed and why and what I can do to prevent it, otherwise it's a dice roll.

Until I hear a clear explanation of why some have failed and what can be done to prevent it it's a crap shoot.

We have two confirmed failures -- where they are in the world is irrelevant.

Is it gauranteed the trans will fail -- no, of course not. Is the chance greater than zero -- yep, sure seems to be the case.

If GTM or Stillen or any other professional shop has a clear answer on why the trans's on these cars probably failed and what can be done to greatly minimize the chance, I'll be happy.

So far, I haven't heard anything except that apparently some people are getting rebuilt transmissions.

I'll give you a related example:

The 2ZZ engine (Celica GT-S, Lotus) is known to break ring lands due to overpower at about 300 crank 250 whp. Do they all break? No. Do some break at lower power? Yes. Is it always somewhere in that 250 whp ball park when a ring land fails? pretty much, yes. Thus, through trial and error (and a few broken motors) a "safe" approximate max power on the stock pistons was determined.

You are still taking a chance, of course, but knowing the approximate physical limits and how to get around them (i.e., use forged pistons) meant people could proceed with more confidence that their motor would hold up over time.

The limits and how to get around them for boosted 7AT's remains UN-FVCKING-KNOWN . All we know is that at least two have failed.

Until we hear what failed and why, what the approximate safe limits are and how to either minimize or eliminate the chance of failure, it remains entirely unknown.

Saying "driver error" tells me nothing. That just means the trans is a time bomb and you are one bad day away from a big problem.

Saying it was due to the clutch bands failing, so the shift speed needs to be increased to prevent the extra wear, or the trans has to rebuilt with new clutch bands that are stronger -- THAT tells me something useful. Was it due to the fluid overheating and thus failing to provide sufficient lubrication -- that can probably be fixed with a stouter trans cooler. I dunno -- beats me. No one has said yet.

Anyway, until someone gives me a clear answer like that, I'd say it's a crap shoot.

Everyone else can do what they want with their car -- but don't pretend that it's incredibly unlikely anything will fail -- clearly that's not the case.

What did you say -- 15 people have boosted 7AT's? Okay 2/15 is still a failure rate of 13% 20 people? 2/20 = 10% failure rate.

Feeling luckier yet?

Show me 100 sucess stories (failure rate of 2%) and I'll feel a little better.

Want to really make me confident my trans won't be a time bomb? Then show me people racing it at the track. Show me people beating the hell out of it without breaking something -- why have all that power if you can't use it? Show me people fidinding the limits and then figuring out how to get around them. Not this "driver error" horsesh!t explanation.

:drama:

Hang on... why is the OP asking this question. He has a 6-speed Nismo... :confused:

Oh...

Next thread: Boosted a 7AT on Impulse, Worried about Trans :icon17:

I'm asking the pros here before I decide to trade it in and boost haha.

Or just trolling....:stirthepot:

I don't even know what that means

As one who has previously boosted a NA car and gone through all the experimentation, excitement, sucess, and failures, let me share with you one piece of advice:

Don't do anything to your car that could break something you can't afford to repair.

In other words, if you don't have the money to rebuild a blown engine/trans, why are you spending the cash to boost it?

It's less of a gamble boosting a factory FI motor/trans, as they are already built stout enough to handle the extra stress of FI, and simply retuning/increasing the boost a bit is less likely to cause a problem.

Anyway, maybe in reality it's only a 1% chance anything will fail -- but unless you have the cash to cover it, why take the chance?

After all, this is why we have warranties and insurance -- to protect against the slim chance something goes wrong during normal driving. Unfortunately, if something goes boom from an aftermarket FI set up, fixing it is your problem (Note: Possible exception: Stillen...)

Anyway, if you have the money to burn -- by all means, go for it. Worst case scenario, something breaks, you'll get it repaired.

First thing you have said I agree with. Bottom line is, if you boost, something will break. The new power will find a weak link and expose it. Not just on the 7AT but on any car. We are basically doubling the HP of the car and it wasnt designed to handle double.

This isnt unique to the 370 as my brother has the new camaro SS auto and is facing simlar iisues if he decides to boost.

Its always a risk to boost. Make your own decision.

+1. My general rule with FI is take whatever budget you think you are going to spend, and triple it. Stuff breaks and goes wrong all the time.

factory stock vs mods
 

A production model sports car has been engineered to last 100k+ miles

most attempts to "up the ante" come at the cost of reduced reliabilty

period

:happydance::ughdance::happydance::bowrofl:

For me, here in Brazil, is better boost this car, becouse for me, this car comes for R$220.000,00 (or UR$130.000,00) +
UR$35.000,00 (TT, exhaust, coilover, special breaks........) = UR$165.000,00

For the americans, is better buy the new GT-R, but for me, the new GT-R comes for R$400.000,00 (or UR$235.000,00)

(Sorry my bad english again :icon17:)