syncro rev match

travisjb

looking for input... when upshifting, i noticed RPMs would run up +200-400 rpms once i pressed the clutch (off the gas)... i've been hestitant to bring it up because i figured it was me gaffing the pedals and probably staying on the accelerator too deep between gears... but after watching a bunch of youtube videos etc it seems to be fairly widespread, so...

theory a: we're all a bunch of hacks (especially me!) and need to learn to let up the accelerator more / faster when up-shifting

theory b: conspiracy... syncro rev match "blips" the throttle even on an upshift

theory c: something else causing RPMs to run up in between gears, e.g., mass of trannie clutch et al released and so engine and flywheel free to spin faster... suppose this is typical, but is there anything about this car that would increase the effect?

anyone else had the same observation?

I think this may be related to the overheating issue on my other thread... rev limiter works - when the driver is stepping on the gas, it steps in- but i'm not convinced it will defeat the engine from accelerating over the rpm limit when the RPM overrun happens in between gears as described above

AK370Z

Theory b is correct. SynchroRev Match assists you even when you upshift. I was just as surprised back then as you are now. I was looking at the Quick Reference Guide and that's when I saw the feature. You can learn in detail in the following thread

Official Nissan 370Z Synchro Rev Match Transmission thread

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travisjb

Thanks... but i'm not completely sold... just read the other thread (and let me know if i'm off base by posting here instead in old thread), and i don't think the issue is just that it matches the lower revs of the next gear up, but that it actually over-accelerates in between gears for whatever reason... ie, I accelerate to 7,000 rpm in second gear, press the clutch / lift the gas, while in neutral it continues to spin the engine faster (to 7,500 rpm), then I shift to 3rd where it matches revs down to 3500-4000ish, and I release the clutch

RCZ

I've noticed it too and I dont like it. I dont like when im coasting a little and it holds the revs up too long..makes me want to turn it off when driving normally.

!xoible

Nope, has nothing to do with synchro-rev thing. i have had that on every manual car i have driven including my G35, and current car, but i dont know about 400 rpm. maybe 200

RCZ

I've driven like 20 different manual cars and none have ever done this. It is definitely part of the SRM system..

!xoible

different people drive differently. please dont do the i've driven x cars or been driving for x years. my e-penis is 100"s too

travisjb

ok, gang... before everyone starts whipping out their thangs, realistically we're going to need input directly from nissan to resolve... or 3rd party that can test and verify...

In the meantime, I'd be interested to hear from others if they think they are experiencing the issue or not, and if they think it is unique to this car and possibly related to SRM... don't let the strong opinions above deter you from sharing. THANKS!

RCZ

You gotta be kidding me, do you even own a Z?

Im not doing "the" anything. Usually it simply adds credibility if I have driven other cars. Please keep your comments under control and the unnecessary idiocy to a minimum. Notice you are starting an argument for absolutely NO reason, we don't look well to people that do that here. There are no e-thugs here and much less of a reason to jump out and start making comments like that. I am not going to argue with you man, but just take it easy...

Sorry Travis,

Sometimes when i put the car in neutral it still holds the RPM's up as if it were waiting for me to chuck the same gear i was just in back in. When I'm upshifting slowly, it likes to hold the RPMs up for the next gear and sometimes that can be annoying. Also when I had the indicator light set at 4000 I would shift at 4k, carefully getting off the gas before releasing the clutch and the RPM's would go over 4k for no reason.

I would definitely like to hear others opinion, people?

!xoible

lol people like me? ur the one who started the argument! In any case sorry if i came off as a e-thug. but that's exactly my point, i do not own a Z and i still have the same exact behavior on every car i have driven. for credibility here's my list of cars i have seen this behavior on when i drive the car hard:
1. 2006 G35
2. 2006 350Z
3. 2007 335i
4. 2008 BMW M3
5. 2008 BMW M5
6. 2007 BMW M6
7. 2008 Subaru STi
8. 2009 370Z
9. i dont know what year but the turbo mazda 6 (like last year's model or the year before)

as far as holding the RPM that makes sense for the new synchro-rev feature. A lot of cars that have rev-matching features like BMW's DCT, and BMW's SMG, do hold that RPM for u, or even blip the gas if the shift is too slow (the case of SMG since it requires input from the driver on the throttle). But revving up? idk why it would do that

RCZ

lol did you really just list out cars you've driven after you told me off for saying I've driven 20 cars....

Well thats what I was talking about, its that holding of the RPM's that other cars don't do..
Other cars may feel like they blip because your foot is still partially on the gas when you put the clutch pedal in... if you are completely off the throttle when you put the clutch in, that CANNOT happen as you are not giving the engine more throttle.. This is where the 370 is different, the SRM system holds the RPM after you let the clutch out...

!xoible

yes, you made a point that you said the number for credibility. lol

actually SMG does blip the gas even if ur foot is off the throttle. in fact in shifting up this is a perfect example of when it blips the gas. same for DCT.

but see now it's making sense. the 200 extra RPM u see is just because when driving hard there's probably still gas getting injected while you depress the clutch. that's how _I_ get my extra 200 RPM's.

now in the Z's case it sounds like it holds the RPM + whatever i do so u get even more rev?

RCZ

Correct.

Also SMG and DCT dont qualify as classic manuals Which is what I was talking about.

!xoible

Namir

Ok all pointless bantering aside,

Why would the car increase revs between upshifts. The next (higher) gear you select will cause your revs to drop, so revving the rpms higher will make the rpms difference even greater during the upshift.

Basically, it seems to be replicating the "no lift shift" or "powershifting" which isn't exactly easy on the tranny.
I don't have a Z, so comments/corrections are welcome.

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