Why Did My Z, Keep Revving? Video.

Modshack · 01-29-2010, 08:59 AM

Quote:

Originally Posted by bullitt5897

first of all you are in sport mode which enables synchro rev match. Secondly you pulled the transmission out of gear and left it in neutral from 5th gear. The way synchro rev match works is that it anticipates your next gear so for instance if I were to shift from 5th to 4th it would rev for 4th gear's rpms.

I'm kinda doubting that diagnosis, with one exception: The cold...

First, the Syncro rev match doesn't anticipate anything. It is purely analog in that Microswitches in the gate are triggered depending on what gear you intend to enter. You can actually feel the point of switch engagement when you move the stick and the revs go up...The only way this could happen as in the video would be if the Microswitches were sticking because of the cold......However, a shift to neutral should not have triggered them at all unless it was a sloppy shift and bumped against the switch engagement point.

m4a1mustang · 01-29-2010, 09:03 AM

Quote:

Originally Posted by Modshack

I'm kinda doubting that diagnosis, with one exception: The cold...

First, the Syncro rev match doesn't anticipate anything. It is purely analog in that Microswitches in the gate are triggered depending on what gear you intend to enter. You can actually feel the point of switch engagement when you move the stick and the revs go up...The only way this could happen as in the video would be if the Microswitches were sticking because of the cold......However, a shift to neutral should not have triggered them at all unless it was a sloppy shift and bumped against the switch engagement point.

Yup. And if he did trigger the switch the revs would blip higher.

I don't really think SRM is the cause here. The OP needs to disconnect the battery to reset the ECU, then see if he runs into the same issue again. If he does... take it in for warranty service.

ChrisSlicks · 01-29-2010, 11:22 AM

Quote:

Originally Posted by Modshack

First, the Syncro rev match doesn't anticipate anything. It is purely analog in that Microswitches in the gate are triggered depending on what gear you intend to enter. You can actually feel the point of switch engagement when you move the stick and the revs go up...The only way this could happen as in the video would be if the Microswitches were sticking because of the cold......However, a shift to neutral should not have triggered them at all unless it was a sloppy shift and bumped against the switch engagement point.

There are sensors in the 3 neutral positions as well which it uses to start revving based on which gear pair you are heading for. But in this case it didn't look like SRM behavior at all because the RPM's kept creeping up slowly, normally SRM hits the target RPM exactly and doesn't fluctuate.

TheWeatherman · 01-29-2010, 12:32 PM

By the way... I still absolutely love these cars! My Infiniti as well.

Tyrell Tyson · 01-29-2010, 12:38 PM

You do? hows the ringing sound going mate?

- Ty

Modshack · 01-29-2010, 01:09 PM

Quote:

Originally Posted by ChrisSlicks

There are sensors in the 3 neutral positions as well which it uses to start revving based on which gear pair you are heading for. But in this case it didn't look like SRM behavior at all because the RPM's kept creeping up slowly, normally SRM hits the target RPM exactly and doesn't fluctuate.

I can wiggle my stick all I want in the neutral gate with no SRM activity. Others have reported some triggering though. Mine will not rev match until I make a definitive move into a respective gear gate FWIW...

ChrisSlicks · 01-29-2010, 01:21 PM

Quote:

Originally Posted by Modshack

I can wiggle my stick all I want in the neutral gate with no SRM activity. Others have reported some triggering though. Mine will not rev match until I make a definitive move into a respective gear gate FWIW...

Strange, mine revs up as I push the stick left through the neutral zone (watch out for Romulans). For example if I'm cruising in 6th and I move straight up the revs hold where they are, then if I move it to center neutral it will rev some more (anticipating a shift to 3rd or 4th), and if I go all the way left it will rev way up anticipating a shift to 1st or 2nd. Then when I actually start moving from neutral to a gear it will lock onto the actual RPM it needs for that gear ratio which may cause it to rev up a little higher still in the case of 1, 3, 5. In neutral it only does this for about 2 seconds before it gives up on you.

I've seen other people documenting this behavior, including a video so I know I'm not crazy.

TheWeatherman · 01-29-2010, 01:44 PM

Quote:

Originally Posted by ChrisSlicks

Strange, mine revs up as I push the stick left through the neutral zone (watch out for Romulans). For example if I'm cruising in 6th and I move straight up the revs hold where they are, then if I move it to center neutral it will rev some more (anticipating a shift to 3rd or 4th), and if I go all the way left it will rev way up anticipating a shift to 1st or 2nd. Then when I actually start moving from neutral to a gear it will lock onto the actual RPM it needs for that gear ratio which may cause it to rev up a little higher still in the case of 1, 3, 5. In neutral it only does this for about 2 seconds before it gives up on you.

I've seen other people documenting this behavior, including a video so I know I'm not crazy.

Well, I'm bringin' the ol' girl in. I'll keep ya updated. I just can't wait to take it out again! It's like a good excuse! "Darn. Gotta take it in."

Modshack · 01-29-2010, 01:49 PM

Quote:

Originally Posted by ChrisSlicks

I've seen other people documenting this behavior, including a video so I know I'm not crazy.

Yeah..I've seen others mention this before too. I would tend to think mine is operating correctly and the other behavior is not....

bullitt5897 · 01-29-2010, 02:09 PM

Quote:

Originally Posted by ChrisSlicks

Strange, mine revs up as I push the stick left through the neutral zone (watch out for Romulans). For example if I'm cruising in 6th and I move straight up the revs hold where they are, then if I move it to center neutral it will rev some more (anticipating a shift to 3rd or 4th), and if I go all the way left it will rev way up anticipating a shift to 1st or 2nd. Then when I actually start moving from neutral to a gear it will lock onto the actual RPM it needs for that gear ratio which may cause it to rev up a little higher still in the case of 1, 3, 5. In neutral it only does this for about 2 seconds before it gives up on you.

I've seen other people documenting this behavior, including a video so I know I'm not crazy.

Mine does the exact same thing

I think modshack's is broken. you know what they say if everyone else's is different it just maybe yours thats broken!

SiXK · 01-29-2010, 02:33 PM

Quote:

Originally Posted by ChrisSlicks

Strange, mine revs up as I push the stick left through the neutral zone (watch out for Romulans). For example if I'm cruising in 6th and I move straight up the revs hold where they are, then if I move it to center neutral it will rev some more (anticipating a shift to 3rd or 4th), and if I go all the way left it will rev way up anticipating a shift to 1st or 2nd. Then when I actually start moving from neutral to a gear it will lock onto the actual RPM it needs for that gear ratio which may cause it to rev up a little higher still in the case of 1, 3, 5. In neutral it only does this for about 2 seconds before it gives up on you.

I've seen other people documenting this behavior, including a video so I know I'm not crazy.

Mine behaves exactly like yours.

Weatherman, have you ever just tried turning SRM off like someone suggested? You state you know it isn't SRM (and I agree its not how SRM is supposed to work) but it seems such an easy way to test if its the SRM malfunctioning. I work in IT and when we are faced with malfunctioning/faulty systems we eliminate everything we can even if we doubt it could be the problem. Seems like it would take 3 seconds to be sure.

TheWeatherman · 01-29-2010, 04:34 PM

Quote:

Originally Posted by LSUTurboTiger

Mine behaves exactly like yours.

Weatherman, have you ever just tried turning SRM off like someone suggested? You state you know it isn't SRM (and I agree its not how SRM is supposed to work) but it seems such an easy way to test if its the SRM malfunctioning. I work in IT and when we are faced with malfunctioning/faulty systems we eliminate everything we can even if we doubt it could be the problem. Seems like it would take 3 seconds to be sure.

I didn't think to try that LSU. It's in the shop now. I have 2 loaner cars now! Ha ha! One's a Mercedes ML350 and the other is a Chrysler 300M V-6. I have to say that whether it was my Infiniti or the Z, Nissan and my dealers have been very, very nice. If there's something wrong, I can't ask for better service than this all around. I won't have a word on what happened until next week. Thanks for all the input everyone!

Pushing_Tin · 01-29-2010, 02:27 PM

Quote:

Originally Posted by Modshack

I can wiggle my stick all I want in the neutral gate with no SRM activity. Others have reported some triggering though. Mine will not rev match until I make a definitive move into a respective gear gate FWIW...

Mine is the same.

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01-29-2010, 12:32 PM	#4 (permalink)
TheWeatherman Enthusiast Member Join Date: Mar 2009 Location: Milwaukee, WI Posts: 265 Drives: 2009 370Z 6MTw/Sport Rep Power: 17	By the way... I still absolutely love these cars! My Infiniti as well.

01-29-2010, 12:38 PM	#5 (permalink)
Tyrell Tyson Enthusiast Member Join Date: Jan 2010 Location: EU Posts: 295 Drives: P90 TR Rep Power: 16	You do? hows the ringing sound going mate? - Ty