Transmission failure

spearfish25 · 10-13-2009, 08:26 PM

Were you using the SRM? I'm curious if the transmission failures are occuring in cars driven solely using SRM, driven without SRM and attempted to rev match manually, or without SRM and no attempts at rev matching on shifts.

Modshack · 10-13-2009, 08:31 PM

Quote:

Originally Posted by spearfish25

Were you using the SRM? I'm curious if the transmission failures are occuring in cars driven solely using SRM, driven without SRM and attempted to rev match manually, or without SRM and no attempts at rev matching on shifts.

SRM should have nothing at all to do with this. It actually has little to do with the transmission really, except for the microswitches at the shifter which send the signals to the computer to do the engine rev match. Syncro and gear failures are stictly mechanical issues..

FuszNissan · 10-13-2009, 08:34 PM

Correct me if I am wrong but I thought there was a small magnet on top of the tranny that lines the syncros up to perform the blip.

spearfish25 · 10-13-2009, 08:35 PM

Quote:

Originally Posted by Modshack

SRM should have nothing at all to do with this. It actually has little to do with the transmission really, except for the microswitches at the shifter which send the signals to the computer to do the engine rev match. Syncro and gear failures are stictly mechanical issues..

More interested in driver miscalculation during engine rev matching during shifts as a possible cause to premature failure. My thought is that SRM would minimize the effect of poor rev matching which could contribute to premature transmission wear.

Modshack · 10-13-2009, 08:51 PM

Quote:

Originally Posted by spearfish25

More interested in driver miscalculation during engine rev matching during shifts as a possible cause to premature failure. My thought is that SRM would minimize the effect of poor rev matching which could contribute to premature transmission wear.

Syncros have to work just as hard downshifting with or without SRM rev matching since it's not a true double clutch match.....Doubt it would make a difference...

KillerBee370 · 10-13-2009, 11:18 PM

4500 miles and no issues to speak of. Then again, I don't use 6th all that often. Usually only when the MPH heads north of 80 on the highway. I treat it more like a cruise control gear if that makes any sense... In other words, no stop and go traffic, long highway runs, etc.

sw1318 · 10-14-2009, 08:48 AM

Quote:

Originally Posted by Modshack

SRM should have nothing at all to do with this. It actually has little to do with the transmission really, except for the microswitches at the shifter which send the signals to the computer to do the engine rev match. Syncro and gear failures are stictly mechanical issues..

I agree with you, SRM is designed to smooth out gear changes and balances the chassis. In fact it might actually avoid damages to your transmission while downshifting! It’s a great feature but heel and toe is still more fun but not as accurate as the computer!

Solus · 10-14-2009, 09:01 AM

I already got mine replaced once... it was the synchros.. they replaced the whole trans

sw1318 · 10-14-2009, 09:18 AM

Quote:

Originally Posted by Solus

I already got mine replaced once... it was the synchros.. they replaced the whole trans

Did they explain to you how the synchro contributed to the failure??

Solus · 10-14-2009, 09:32 AM

Nope just took it and replaced it.. the tech pulled the trans off and put the new one on in like 4-5 hours lol.. i was impressed.

edeeZee · 10-14-2009, 12:32 PM

Here's a better solution: forget 7AT or 6M, just cut a big hole in your floor board and scream "yabba, dabba doooooo!!!!!!!!!!!" and you'll shift faster than any tranny for that matter

kenchan · 10-14-2009, 12:35 PM

Quote:

Originally Posted by edeeZee

Here's a better solution: forget 7AT or 6M, just cut a big hole in your floor board and scream "yabba, dabba doooooo!!!!!!!!!!!" and you'll shift faster than any tranny for that matter

now that makes no sense cause fred's feet are the engine.
we're talking about transmissions here...

ScooterN2 · 10-14-2009, 07:12 PM

Like any car, there are bound to be some problems, but there have been a number of posts on this board of new buyers of MT who have never driven one and asking advice whether they can do it. There was also a thread where it was stated that someone discovered that they didn't need to fully depress the clutch to shift. And we know a few are drivin the sh.. out their cars and a missed shift etc is possible. So lets not blow this out of proportion until there are more reports or we understand more of potential causes.

Modshack · 10-16-2009, 01:25 PM

Quote:

Originally Posted by FuszNissan

Correct me if I am wrong but I thought there was a small magnet on top of the tranny that lines the syncros up to perform the blip.

Looks like it's just a rotational (RPM) speed sensor Lou...Check the pic at the link....:
2009 Nissan 370Z's SynchroRev Match Explained - Tech Dept. - Auto Reviews - Car and Driver

alan93rsa · 10-16-2009, 09:55 PM

Quote:

A Transmission issue at 4 to 6 K points directly at driver attitude.

Ever hear of the snap ring issue with the NSX transmission? It could be something as simple as a tolerance stacking issue. I suspect NISSAN will be working on this.

10-13-2009, 08:34 PM	#18 (permalink)
FuszNissan A True Z Fanatic Join Date: May 2009 Location: St. Louis Posts: 14,275 Drives: Pure Sex Rep Power: 542	Correct me if I am wrong but I thought there was a small magnet on top of the tranny that lines the syncros up to perform the blip. __________________ Mods: Too Many to list! LouFuszNissan ZDAYZ 2012

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
transmission grinding?	Daishi	Engine & Drivetrain	23	01-20-2010 05:43 AM
2 Nismos transmission failure after highway driving.	Baddriver	Nissan 370Z General Discussions	45	09-23-2009 06:34 PM
transmission questions	zoltan370z	Engine & Drivetrain	14	05-25-2009 09:52 PM
transmission noises	zoltan370z	Engine & Drivetrain	0	05-16-2009 08:49 AM
Transmission?	370z2	Nissan 370Z General Discussions	10	01-29-2009 01:41 PM

10-13-2009, 08:26 PM	#16 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Were you using the SRM? I'm curious if the transmission failures are occuring in cars driven solely using SRM, driven without SRM and attempted to rev match manually, or without SRM and no attempts at rev matching on shifts.

10-13-2009, 11:18 PM	#21 (permalink)
KillerBee370 A True Z Fanatic Join Date: Mar 2009 Location: So Cal baby! Age: 51 Posts: 5,964 Drives: with passion Rep Power: 321	4500 miles and no issues to speak of. Then again, I don't use 6th all that often. Usually only when the MPH heads north of 80 on the highway. I treat it more like a cruise control gear if that makes any sense... In other words, no stop and go traffic, long highway runs, etc.

10-14-2009, 09:01 AM	#23 (permalink)
Solus Enthusiast Member Join Date: Apr 2009 Location: Jacksonville, NC Posts: 453 Drives: 2009 Nissan 370z Rep Power: 16	I already got mine replaced once... it was the synchros.. they replaced the whole trans

10-14-2009, 09:32 AM	#25 (permalink)
Solus Enthusiast Member Join Date: Apr 2009 Location: Jacksonville, NC Posts: 453 Drives: 2009 Nissan 370z Rep Power: 16	Nope just took it and replaced it.. the tech pulled the trans off and put the new one on in like 4-5 hours lol.. i was impressed.

10-14-2009, 12:32 PM	#26 (permalink)
edeeZee Track Member Join Date: May 2009 Location: s. cali, los angeles Posts: 627 Drives: 09 370z plat 6 speed Rep Power: 266	Here's a better solution: forget 7AT or 6M, just cut a big hole in your floor board and scream "yabba, dabba doooooo!!!!!!!!!!!" and you'll shift faster than any tranny for that matter

10-14-2009, 07:12 PM	#28 (permalink)
ScooterN2 Base Member Join Date: Jan 2009 Location: Salt Lake City, UT Posts: 27 Drives: 03 WRX, 09 370Z Rep Power: 261	Like any car, there are bound to be some problems, but there have been a number of posts on this board of new buyers of MT who have never driven one and asking advice whether they can do it. There was also a thread where it was stated that someone discovered that they didn't need to fully depress the clutch to shift. And we know a few are drivin the sh.. out their cars and a missed shift etc is possible. So lets not blow this out of proportion until there are more reports or we understand more of potential causes.