Official Nissan 370Z Synchro Rev Match Transmission thread

[PloppityDrown]

From Edmund's Inside Line:

SynchroRev Match is all zeros and ones--there is no black box or additional hardware. The 370Z's engine controller simply compares the engine speed to the data being fed by the rear wheel speed sensors. Since it "sees" the gear lever position and "knows" all of the gear ratios in the transmission, simple math dictates what the engine speed needs to be when you go for, say third gear at 60 mph.

Since the Synchro-Rev-Matching is performed by comparing engine speed to rear wheel speed, wouldn't altering the rear tire size (and therefore the gear ratios) reduce the system's accuracy?

I've never seen this mentioned, so maybe the effect is negligible (+/- 5%) or the system is able to trim out changes in gear ratio. You'd think Nissan would have designed the system that way, since the gear ratio changes slightly as the tires wear. Have you guys ever noticed imperfect rev-matches with new tires?

[Smallywood]

Originally Posted by PloppityDrown

From Edmund's Inside Line:



Since the Synchro-Rev-Matching is performed by comparing engine speed to rear wheel speed, wouldn't altering the rear tire size (and therefore the gear ratios) reduce the system's accuracy?

I've never seen this mentioned, so maybe the effect is negligible (+/- 5%) or the system is able to trim out changes in gear ratio. You'd think Nissan would have designed the system that way, since the gear ratio changes slightly as the tires wear. Have you guys ever noticed imperfect rev-matches with new tires?

I've never had any issues with S-R-M.

[ImportConvert]

I loved it, except when I shift into neutral I waggle the shifter to ensure that it is not somehow still in gear. This drives it crazy. I know, it's a personal problem.

[PloppityDrown]

Originally Posted by ImportConvert

I loved it, except when I shift into neutral I waggle the shifter to ensure that it is not somehow still in gear. This drives it crazy. I know, it's a personal problem.

I noticed the same thing on my test drive--a habit I've picked up from shifting sloppy, mostly FWD transmissions. Probably learned it from my brother, actually. I can't recall this move ever saving me from a stall or a mis-shift or anything. So, yeah, I share this personal problem.

In time I think I'd learn to trust the precise, direct-action shifter in the Z.

[ImportConvert]

Originally Posted by PloppityDrown

I noticed the same thing on my test drive--a habit I've picked up from shifting sloppy, mostly FWD transmissions. Probably learned it from my brother, actually. I can't recall this move ever saving me from a stall or a mis-shift or anything. So, yeah, I share this personal problem.

In time I think I'd learn to trust the precise, direct-action shifter in the Z.

I picked it up driving a 5.0 with a TKO500 transmission. Either way, it's a bad habit. It has saved me, however, from being in gear when I let off on the clutch at a particularly long red-light once. So it's kind a habit I am not so sure I want to get rid of.

[PloppityDrown]

I only catch myself doing it when I've forgotten what gear I'm in, if I'm in gear or neutral. With the 370's in-dash gear indicator (a first for me) that shouldn't be a problem anymore.

[badwolf42]

Does anyone have a picture of the switch and know how the switch physically works? When you depress the button, does it disconnect, or connect the circuit? When you aren't pressing the button, is the circuit complete or broken?

I'm considering buying one for my car, but I don't have or plan to have the rev match feature.

[PapoZalsa]

Originally Posted by badwolf42

Does anyone have a picture of the switch and know how the switch physically works? When you depress the button, does it disconnect, or connect the circuit? When you aren't pressing the button, is the circuit complete or broken?

I'm considering buying one for my car, but I don't have or plan to have the rev match feature.

[Ghost]

I got a question for you folks.

How many of you drive the car in S mode during daily driving?

Why should or shouldn't you?

[LunaZ]

Originally Posted by Ghost

How many of you drive the car in S mode during daily driving?

Why should or shouldn't you?

Always on. No good reason not to use the feature.

[6MT]

Originally Posted by LunaZ

Always on. No good reason not to use the feature.

Uhhhhh.... Really?(!) Sorry dude, I for one really don't like the throttle blip in heavy traffic and stop & go driving. Maybe you're thinking of the VSM feature?
Yes, syncro is a neat feature. But I rarely use it.

[Dreezy562]

Why wouod you need to downshift in stop n go traffic? I rarely get out of 2nd in stop n go traffic and why would you downshift into first that's a no noo

[LunaZ]

Originally Posted by 6MT

Uhhhhh.... Really?(!) Sorry dude, I for one really don't like the throttle blip in heavy traffic and stop & go driving. Maybe you're thinking of the VSM feature?
Yes, syncro is a neat feature. But I rarely use it.

If you have the SRM turned off, I would hope you're blipping the throttle yourself on a downshift, so what's the difference?

[6MT]

Originally Posted by LunaZ

If you have the SRM turned off, I would hope you're blipping the throttle yourself on a downshift, so what's the difference?

Uh, no. Stop & go traffic really doesn't call for rev-matching (either with or without the syncro). Besides the embarassment factor, low rev driving doesn't need rev-matching.

[LunaZ]

Originally Posted by 6MT

Uh, no. Stop & go traffic really doesn't call for rev-matching (either with or without the syncro). Besides the embarassment factor, low rev driving doesn't need rev-matching.

True, and the computer seems to know this as well from what I can tell. There doesn't seem to be any embarrassing revving during downshifts during low rev driving in stop and go traffic, so I don't see the need to turn it off.

Nonetheless, what works for me might not be right for you or someone else, so I encourage everyone to drive the car in all types of conditions with the SRM on and off to determine what works best for them.