Official Nissan 370Z Synchro Rev Match Transmission thread

[JARblue]

Originally Posted by Rahul718

So I assume my slower shift in that situation would make the SRM up rev the engine because it spent a little longer than usual in neutral. Is that right?

However...I didn't notice this in other gear up shifts even when I went slower on purpose. Thoughts?

Also, with S mode turned off, there's no up rev going into 5th gear even if I slow shift it

Sort of right. It's all about the RPMs the engine wants for your current gear/speed. If you stay in neutral long enough to drop below the ideal RPMs for your next gear, then it will rev match if you have SRM on. When downshifting, the RPMs will always be lower than what they should be for the next gear, and the car will always rev match. When upshifting, your RPMs are typically higher than what they will be for the next gear. The caveat you have found is when you stay in neutral too long on an upshift, the RPMs will continue to drop while in neutral and by the time you shift to the next gear the engine needs to rev match. If you have SRM turned off there is no automatic rev matching, and you should be doing the rev matching yourself to minimize wear on the clutch and transmission.

[Rahul718]

Originally Posted by JARblue

Sort of right. It's all about the RPMs the engine wants for your current gear/speed. If you stay in neutral long enough to drop below the ideal RPMs for your next gear, then it will rev match if you have SRM on. When downshifting, the RPMs will always be lower than what they should be for the next gear, and the car will always rev match. When upshifting, your RPMs are typically higher than what they will be for the next gear. The caveat you have found is when you stay in neutral too long on an upshift, the RPMs will continue to drop while in neutral and by the time you shift to the next gear the engine needs to rev match. If you have SRM turned off there is no automatic rev matching, and you should be doing the rev matching yourself to minimize wear on the clutch and transmission.

Thank you sir.

So I was kind of right. My slow 4th to 5th up shift means the car stays in neutral longer than it should and that causes RPM to drop. So when I do get into 5th the SRM will automatically rev to be in the right RPM for 5th.

What's weird is that it doesn't do this in other gear upshifts even if I purposely go slow

[JARblue]

Are you sure it doesn't do it in other gears? Try it at like 60-70 mph in 3rd gear and hang in neutral before shifting to 4th. If you actually shift into the gear or at least hold the shifter at the gate with the clutch in and still in neutral, the engine will continue to rev match as the RPMs drop even as the car slows.

[Rahul718]

Originally Posted by diabolus370z

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.

Originally Posted by JARblue

Are you sure it doesn't do it in other gears? Try it at like 60-70 mph in 3rd gear and hang in neutral before shifting to 4th. If you actually shift into the gear or at least hold the shifter at the gate with the clutch in and still in neutral, the engine will continue to rev match as the RPMs drop even as the car slows.

Jus did it 3rd to 4th with a longer pause in Neutral and it revved up. But what gets is that it seems the 4th to 5th shift is way way way more sensitive to the SRM revving up when going into 5th. Also, sometimes it happens and sometimes it doesn't. Really weird. Is it worth taking to the dealer?

[Rahul718]

Took q video of my 4th-5th upshift and the SRM blipping the rpm by 500. It's very frustrating and I'm taking the car to the dealer soon to get looked at. My foot was no where near the accelerator when this happened and it was a very clean deliberate upshift into 5th. What the hell is causing it to rev like that? Oh right, it's at 14 seconds in the video

[Houston Z33]

In my eyes, SyncroRev alone made the jump from HR350 to 370 worth it.

[HEK]

On a side note I get better gas milage w/out using it around town as I drive with traffic, but weekends when I can let loose and remian under 100 mph the gas milage drops by a few mpg...just my 2 cents.

When I bought the Z almost 9k miles ago I left the button on 100% of the time which led me to re read this post and see if anyone else had responded about the consecuences of any wear on the vehicle...is there any and where, thanks

[Airjago]

I've turned the SRM feature off from day one and I still feel that there is RPM float when upshifting. That is, 1st gear going into 2nd, clutch in at 3K RPM and the car holds it there briefly instead of dropping immediately. I'm by no means an expert MT shifting pro, but I still need to wait a good 0.5-1s after I'm ready to clutch out. If I don't wait, then the RPM will be too high and jerk the car on reengagement.

How the heck do I fix THAT?

[Z_ealot]

Originally Posted by Airjago

I've turned the SRM feature off from day one and I still feel that there is RPM float when upshifting. That is, 1st gear going into 2nd, clutch in at 3K RPM and the car holds it there briefly instead of dropping immediately. I'm by no means an expert MT shifting pro, but I still need to wait a good 0.5-1s after I'm ready to clutch out. If I don't wait, then the RPM will be too high and jerk the car on reengagement.

How the heck do I fix THAT?

Only fix for that is a lightened flywheel as the stock one is pretty heavy so it tends to cause a delay in the rpm's coming down faster

[Airjago]

Originally Posted by Z_ealot

Only fix for that is a lightened flywheel as the stock one is pretty heavy so it tends to cause a delay in the rpm's coming down faster

Thanks for the suggestion Z. So does your comment mean the RPM float is real and I'm not just imaging it?!

[LAVA]

Originally Posted by Airjago

Thanks for the suggestion Z. So does your comment mean the RPM float is real and I'm not just imaging it?!

That's exactly what it sounds like Z_ealot's saying... makes sense with a 30+lb flywheel

[Z_ealot]

Originally Posted by Airjago

Thanks for the suggestion Z. So does your comment mean the RPM float is real and I'm not just imaging it?!

You are correct sir! My current Z as well as my first Z both did it even with the syncro rev turned off...pretty sure someone has commented on this forum before about how their lightened flywheel they had installed made their revs come down much quicker

[LAVA]

Originally Posted by Airjago

I've turned the SRM feature off from day one and I still feel that there is RPM float when upshifting. That is, 1st gear going into 2nd, clutch in at 3K RPM and the car holds it there briefly instead of dropping immediately. I'm by no means an expert MT shifting pro, but I still need to wait a good 0.5-1s after I'm ready to clutch out. If I don't wait, then the RPM will be too high and jerk the car on reengagement.

How the heck do I fix THAT?

I noticed mine does this and was curious wtf is going on, thx for posting something about it.