7 speed good it just can not believe this.

Blue370tt

Question: DO YOU EVEN READ THE FORUM BEFORE POSTING?

I run my TT'd 7AT all the time AND PUSH IT IN THE HIGH GEARS WITH NO PROBLEMS......why and how: this from above:

Depends on yout tranny tune. Z1 iincreased my line pressues on all gear shifts with more focus on the taller gears (4,5,6,7) to decrease clutch time between shifts. All this is in normal D mode.

To date, ONLY A SC has blown a 7AT and we dont know exactly why. Its not the TRQ that kills the 7AT, its the small clutches that the tall gears have (4,5,6,7).

I NEVER DRIVE MY 7AT IN MANUAL MODE.....ONLY D. MY tranny is tuned to shift IN D just as good as in M. Higher line pressures reduce shift/clutch time and decrease the chance of damage.

KaienZ34

No I never read as I'm blind. Damn take a pill and and relax a bit. If you don't want to answer then don't. I wasn't asking you directly, I've talked to Sam at GTM and didn't really get a direct answer. He did say it was the TRQ that did in the clutches of the upper gears. So I don't know how big the stick up your butt is. I can how ever recommend a good proctologist. When you do have it removed we would all love to see

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b1adesofcha0s

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Blue370tt

OK, to re-state: I guess you could say it is TRQ.....but not really. The real problem is that the tall gear clutches are to small (as I said above). The only solution for now is to increase the speed of the shifts so that you keep the tranny out of the small clutches as much as possible. If you are FI and your tranny IS NOT TUNED by uprev osiris, then the solution would be to stay in manual mode when pushing the car hard and be careful in the tall gears.

A valve body upgrade and tune by GTM would also solve this issue temporarily. Hopefully someone comes out with a way to rebuild the trannys so that the clutches are stronger.

P.S. No stick in my butt. Thanks for the offer to help.

Red__Zed

KaienZ34

No problem. Anytime.

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Mr&Mrs

Blue370 you said your line pressure is at the same levels in D as M. So can you increase the pressure even more than what it is in M mode? Or is this the max?

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Blue370tt

Mr.and Mrs., I am not sure if anyone knows what max is? If you want specifics on where my actual line pressures are at, you will need to talk with John at Z1 motorsports as he is the one who did my tune.

I know the topline information but am not a mechanic......thats why I go to Z1.

wstar

Since you slipped this into the end of a locked thread elsewhere, I'll pick it up here where it flows right into the conversation.

AT's aren't as efficient as MTs, you do have to just get over that basic fact. Solid gear engagement vs fluid drive, simple as that. Our AT's do have a lock-up mechanism, but it's not employed full time, it's conditional. The 7AT is known to be faster in the 1/4, that's true on most good cars really.

Shifting time has two factors to it: the reaction to the shift input, and the actual shift time. The actual shift time on the stock 7AT is reasonably good, but any half decent manual driver will beat it. Add in the reaction delay to the up/down-shift commands, and it's notably slower. Of course, you wouldn't realize any of this because, and I quote:

Those paddles are there for a reason, if you're not using them you're really not driving the car. D-mode doesn't ever downshift properly for corners (it can't, it's not psychic, regardless of your special tuning). If all you do is drag-race the car, frankly there are faster and cheaper options for drag-racing than a 370Z :P. Your opinion on the relative shifting speed and predictability are meaningless if you only ever drive in D.

I don't regret my choice on the 7AT, but you have to face up to the fact that it is an AT, and it does come with an AT's shortcomings.

Back to your special tuning, I wasn't even aware Osiris Tuner was capable of changing the line pressure, do you have more details on this? They're certainly not advertising the feature publicly. Did your tuner say anything about possibly reduced tranny life with the upgraded line pressure without valve body upgrades?

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Blue370tt

I am not getting into an opinion debate here: "but you have to face up to the fact that it is an AT, and it does come with an AT's shortcomings".....yes you're right....its still 1962 and AT's have'nt changed at all.

As far as your awareness of Osiris tuning on the 7AT: Its a well known fact among any 7AT's considering FI (SC or TT) on this forum and is in many of the posts and threads about FI. The tuner does'nt really know about reduced tranny life due to increased line pressures, but its irrelevant because if you dont increase your line pressures with FI you might damage the tranny NOW because of increased HP/TRQ.

There are many mysteries with this car. Will it reduce tranny life, its a new tranny....no one knows....they can guess but dont really know. Unrelated to the thread but related to this post: VVEL hasnt even been figured out by FI and tuners yet......its very complicated......so is the ECU......NONE of the tranny, VVEL, or ECU technology is the same as the 350Z or any previous car. Its still being figured out from an aftermarket point of view.

wstar

I didn't say they hadn't changed. They've improved greatly since 1962. So have MT's for that matter (much better synchronization, and of course now the automatic blipping on our cars). But it's still a fluid-drive transmission.

Think about it: There's a real reason that higher end manufacturers are putting in expensive, heavy systems like PDK and DSG (the true semi-automatics which are basically sequential manuals with automated clutches), instead of just using ATs with paddle shifters. ATs are fluid drive (lossy/inefficient) and slow to shift. The one nice thing about the AT system is the fluid torque multiplication, which really can help in the low RPMs.

In truly aggressive/track driving situation, the 6MT has the edge in shifting speed by a mile. Your quoted numbers are just the physical shifting time (e.g. in D-mode drag racing), you have to add on top of that the input delay on the M-mode system, which you're going to have to use for any serious driving (downshifting). A good 6MT will beat that any day. I've gotten used to the 7AT's shift delay to where I can compensate by shifting "early", but it took a while to get my brain to do that reliably. There are other things you have to re-teach your brain about too, like not dropping off the gas pedal until after you upshift instead of while upshifting (or else the 7AT gets confused and shifts extremely slow and clunky).

I wasn't aware this had been discussed elsewhere, but it's interesting. I'll have to talk to some local Osiris tuners and see if I can get them to play with the line pressure on mine. I'd love quicker shifts and engagements even without FI. Something tells me it will have no effect on the lag between shift button input and the start of the shifting process in M-mode though.

I love the 7AT, it's a great transmission for a mixed-use car, I just think you're taking it a little too far in claiming it's superior in every way to the 6MT. It clearly isn't.

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Blue370tt

Really: here is a quote from Zelim

"I data loged the the 7 AT in the 12.42 run.

Launched at 2500 rpm.
2nd engaged at 5237, shift time 0.3 seconds
3rd engaged at 5237 , shift time 0.31 seconds
4th engaged at 5525, shift time 0.39 seconds
5th engaged at 5587, shift time 0.68 seconds"

So, MT's can shift faster than an average of .35 seconds......really???REALLY????

theDreamer

Yes, they can.

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4r3s

I'm confused on why this person was hitting 5th gear in the 1/4 mile, I barely got into 4th before the 1/4mile was over...

b1adesofcha0s

The fastest N/A 1/4 mile time I've seen was jnaut in his 6MT.

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Project: b1adeZmobile (2009 370Z) | Uprev Tune by AAM Competition | Berk Exhaust
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