Official Nissan 370Z Synchro Rev Match Transmission thread
 

Okay, after getting pms from many YouTube users wanting to know about How the new 370Z "SynchroRev Match Transmission" works, I have decided to upload this video.



Quick Reference Guide:

http://www.the370z.com/images/370zfo...he370Z_com.pdf

Okay.. Now, I was NOT aware of the up shifting system until today :confused: . So does this mean, when I upshift, I just have to clutch in and shift the gearbox without worrying about the gas padel?

There's an upshift??

So does that mean I can finally double-clutch like I should, instead of granny shifting??

So when the car is started....is synchro rev match automatically always on?

No. You have to activate the S mode. BUT once activated, it'll remember the setting. So, next time you start the car up, it'll be on.

Interesting. Thanks for the info! :tup:

wow, i wonder if tht is really the case? just clutch n shift?

Wow, I think that must be true, and would explain what I experienced during my test drive yesterday. I was having a hard time upshifting the car when I was driving it, but I thought it was because I wasn't used to the 370's tranny and clutch. I distinctly remember on a couple of occasions the engine revving slightly when upshifting, even though I hadn't touched the gas pedal.

I have driven the 370Z myself and, even before the test drive, I was curious to see if the syncro rev-match feature did anything during upshifts- it did not. You can easily jolt the car with crappy shifts (not rev-matching your upshifts). Maybe im missing something here, but atleast during my test drive, it didn't do anything for my upshifts.

I see that as a good thing. Rev matching itself is a peace of cake during downshifts. Now if someone really needs to get their upshifts rev-matched or is just to lazy to do so themslves, then that's pretty sad. Even with the optional off-button, that person should look into a 7AT instead.

*chuckles*

Am I the only one that got that?

I did not know there was anything for upshifting. We need some more info!

Nope...LOL I need NOS haha.

I noticed this in a video a few weeks ago. I didn't know it was the synchroshift at the time, thought it was just a heavy flywheel, a clutch delay valve or something of that nature.

You can actually hear the upshifts hang on this video of the Mine's track test.

I remember that video and everybody thought he was powershifting.

After this thread, I really don't think so anymore.

Okay guys, I got the official answer. Big thanks goes out to the member here (who's really high up in Nissan USA) who developed this technology for the new 370Z.

You learn something new everyday! :tup:

great to know :icon17:

That has absolutely nothing to do with what the syncro-rev match is "supposed" to do in an upshift according to the OP's post.

The reason you hear what you hear in the video is because he is powershifting. Anyone can do that on a manual tranny.

ok, im confused on the syncro-rev upshifting deal...

For anyone who owns a manual transmission, its a pretty simple concept. If you shifts are slow, meaning the RPM's climb lower than they are supposed to for the next shift, the synchro rev-match keeps the RPM's from falling under the desired RPM's for a smooth transition. (In the other hand, as I experieced in my test drive, if you release the clutch too early, and the RPM's are higher than they are suppose to be, the car will still jerk).

In my opinion, unlike the downshift feature, which would be somewhat useful for a more difficult move like heal & toe, this feature on the upshift is a pure nanny-gadget for those who cant drive a manual.

Rev matching for downshifting or upshifting is a piece of cake and something everyone should master. Assistance for Heal & Toe is atleast a little more comprehensible.

As I see it, there is no driver required interface to rev-match an upshift. You just shift normally and the car reacts to your action. however, the benefits of a proper rev-match will be less noticeable than for downshifts.

I think there is a clear correlation between the video and the fact that we know that the system is holding RPM until you shift into gear.

If he is powershifting he is taking his sweet time to do so. If you look at any other Best Motoring clips he never keeps his foot down on the gas while shifting. (race, time trial, whatever.) From my humble experience, there is very little benefit to doing so on a circuit.

On another note, for some reason the Rev-up 350z's also did this when driven agressively. So, I can't say conclusively that its the SynchroRev, maybe its a heavy flywhel or clutch delay valve. Maybe the causes are different and the effect is the same, Idk? Maybe someone with a Rev-up 350z can tell us why?

Or better yet, some of the new 370z owners need to start flogging their cars and tell us. :tup:

^ You can hear the revs quickly rise as he shifts (that's more than just holding the RPM's). I'm pretty sure he is powershifting.

Like I said in another post, I personally experimented with the 370Z and the syncro-rev match feature and I didn't so such a thing.

P.S. By "holding" the RPM's, they mean holding the RPM to the proper RPM of the next gear. In other words, would only happen during very slow shifts. So it isn't going to be holding an RPM at such a high RPM.

I'm curious if the rev-match is implemented via a DBW throttle system? I've read the spec sheet under the FAQ but didn't see DBW as part of the induction system. Does anyone know?

I hate to rain on the parade, but is anyone else concerned that this synchro rev-matching feature will be the achilles heel of the 370Z in its first year?

I'm probably just being paranoid, cuz I bought one of the first 2003 350Z's.
I experienced a lot of headache from recalls and TSBs....along with a lot of other '03 Z owner friends that had to withstand tranny repairs, alignment issues with the front wheels, bad synchros, rear axle clicking, faulty power windows, etc....

I'm just saying....a lot of first year sports cars have it rough, which is why i always try to wait until the problems are ironed out.

But this feature seems like it has potential to be a nightmare if something goes wrong.

Am I alone in this?

Sorry, just trying to play devil's advocate here, folks.

As far as I know, the manual is the same as before with the sync rev match added (which can be turned off) and the 7AT has been feild tested already with the same power level or more in a heavier car. Hopefully the tire situation they went through on the initial 350Z would make them particularly sensitive in this area with added testing at least...

^^^ you can just turn it off? what problem are you talking about.

You can turn off the rev matching the poster above me was worring about being a failure point. . The early problem I'm refering to was the tire wear problem on the first couple of years on the 350Zs. Lots and lots of complaints.

seriously this synchro rev match transmission...is genius
with the option to turn it off/on too.

props to nissan and their engineering dept!

might see a new trend here with other manual cars..........

I really need to try this feature out when i test drive one.

<TABLE cellSpacing=0 cellPadding=6 width="100%" border=0><TBODY><TR><TD class=alt2 style="BORDER-RIGHT: 1px inset; BORDER-TOP: 1px inset; BORDER-LEFT: 1px inset; BORDER-BOTTOM: 1px inset">Originally Posted by Nissan USA
SynchroRev Match can help with upshifts by holding the RPMs when the clutch is disengaged rather than dropping them to idle like a normal car would.

For drivers who take longer to shift, this can help them be smoother since the revs won't drop down to idle immediately.

Of course, if you wait too long I believe the revs will go to idle, but as soon as the gear shift lever is moved in the direction of a gear the system will set the revs at the appropriate RPM for that gear.

Sorry for the lengthy explanation...it's much easier to understand if you have a chance to experience it.


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This is an awesome feature! I can teach my fiancee how to drive this car. She's totally against me getting it. Function and utility is probably not the best with this car, but man... just look at the performance numbers... and it's so SEXY!! :yum:

I can tell you that it works perfect everytime and you can turn it off if you don't want it. The only frustrating thing is I find myself trying to heal and toe shift b/c it's what I'm use to doing in my older cars. I'm almost relcutant to use it because I don't want to loose my ability to heal and toe, but I have a feeling that most manual cars in the near future will have this feature since it works so well. It is far more accurate then I could ever be. :driving:

Braden

I wonder what will happen with the dreaded issue of money shifting aka mis shifting?

Once in a great while, you will hear a story of how someone wants to downshift from say, 5th gear down to 4th, but accidentally put it in 2nd gear, causing the car to over rev and damage the engine.

With the synchro feature, will it lock you out from going into the 2nd gear?

That's the only problem. It will overrev and may damage the engine if you're not watching the tach but if you downshift to 2nd from 5th manually(without S mode) by accident , same damage will occur.

^ Very true.

It will just happen quicker if you have S mode on and putting in the clutch while in gear will just return the revs to redline if the rev-match is still working. (unless there is a saftey feature that deactivates this once in overrev).

On the other hand, it could save the day...

Lets say your on track, heavy on the brakes while downshifting to fourth, you suddenly hear engine cut-off (redline) due to the rev-match feature trying to match your engine speed to the road.

"Oh SNAP! I was about to downshift into second and blow my motor!" you say, as you immediately stop and go into fourth instead = Synchro-Rev Match (and rev-limiter) saves the day!

The problem is finding a track guy with a humble enough ego to get use to it.

2009 Nissan 370Z: Is Synchro RevMatch the Way of the Future?
 

http://blogs.edmunds.com/roadtests/Zshift01.gif

Source: 2009 Nissan 370Z: Is Synchro RevMatch the Way of the Future? | Long-Term Road Tests Blog on Edmunds' Inside Line

Even though some of my friends don't like the Z but they have all praised about the synchroRev match technology. One of them (who drives a bmw) is totally amazed by the SRM and wishes if BMW would adapt this technology on the upcoming vehicle. I personally love the feature and still haven't turned off since I left the dealer lot. I gotta say, thanks Nissan to bring something new to the table. :worship:

Does DRM (or synchrorev) work with 7-Speed Automatic using Manual Paddle shift?

Of course. Every automatic transmission by default has "synchro rev match"

You may have misunderstood my question. I know automatics will syncrev and the 370 has DRM in Automatic mode. However, what happens if you paddle shift the 7-Speed Automatic - Manually -? Do you still get the benefit of DRM (or syncrev matching)?

It's all a smooth transition whether up or down. Paddle shifters or not.

Ok, excellent. Thanks for the answer.

Does anyone know yet whether a change in the final drive gear (from the stock 3.69 to say, 4.08) would affect the function of SRM?