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.

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.

semtex · 01-29-2010, 08:32 AM

^ That's a pretty astute observation, Mike! TW, do you in fact always go from a high gear directly into N? You may not, but we can only go by what's in the video, so . . .

m4a1mustang · 01-29-2010, 08:59 AM

Quote:

Originally Posted by semtex

^ That's a pretty astute observation, Mike! TW, do you in fact always go from a high gear directly into N? You may not, but we can only go by what's in the video, so . . .

I didn't really think of the SRM being the source of the issue because I have never had it do any of this lazy rev stuff. Usually if I pop out of gear to coast to a stop the RPMs will just drop unless I really act like I'm goign to engage a lower gear... and then it's an aggressive blip.

semtex · 01-29-2010, 09:17 AM

Btw, just to be clear, based on this happening when you're not even in motion and outside the car, I would agree that it's not SRM. I just think it can't hurt to see if turning SRM yields any change in behavior is all. Every little clue helps, after all.

gemini09m3 · 01-29-2010, 09:27 AM

Instead of worrying about how this situation scares you just take it to the dealer its under warranty!!!!

TheWeatherman · 01-29-2010, 09:31 AM

Quote:

Originally Posted by gemini09m3

Instead of worrying about how this situation scares you just take it to the dealer its under warranty!!!!

I'm not scared. I just thought I'd share it with you guys! Something to watch for.

WICKED_GRIN · 01-29-2010, 09:35 AM

Quote:

Originally Posted by gemini09m3

Instead of worrying about how this situation scares you just take it to the dealer its under warranty!!!!

+1

bullitt5897 · 01-29-2010, 09:55 AM

TW, I have played around with SRM quite a bit and yes it will hold 3500rpms in neutral if it is near one of the gates. I as a fun lil habit when coasting in neutral will push the shifter laterally to the lower gears and it will act like it rev'd but I never came even close to a gate... in my case it would hold it for several seconds and then finally relent. I believe with turning the SRM system off while running the car for a few mile then turning it back on will help trouble shoot the issue. For sure I know it is an SRM issue like I stated before. I didnt see that you were at zero mph earlier and after watching the video again I see that. turn off the SRM drive it and see if that fixes the issue, then turn it back on and see if it continues. if that doesnt work unplug the battery for several minutes to let everything die down and then plug the battery back up and try again.

This is problem shooting 101... Now you say you arent worried but man seriously you should hear your voice in that video. Im not meaning to sound like a prick or an A$$hole but you sound so worried and like a little b!tch. I dont mean to be rude but take a step out and realize its a machine it may have problems and its not doing it to you on purpose. Its not bad luck either and if the problem persists take it to the dealer this is not that big of a deal! and this coming from 1 of 2 on these forums that has blown a stock motor already! I blew my motor at 10,100 miles and 1/2 mile from the dealership cause the motor was making funny noises. My car has been in more shops for over 6 months than it has been on the road. Just relax and take another video without the "why is this happening to me" attitude... Thanks and we all want to see you enjoying your Z so try these trouble shooting ideas before you shoot them down.

Mike

01-29-2010, 08:32 AM	#9 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 55 Posts: 5,995 Drives: People to drink Rep Power: 34	^ That's a pretty astute observation, Mike! TW, do you in fact always go from a high gear directly into N? You may not, but we can only go by what's in the video, so . . . __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

01-29-2010, 09:17 AM	#11 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 55 Posts: 5,995 Drives: People to drink Rep Power: 34	Btw, just to be clear, based on this happening when you're not even in motion and outside the car, I would agree that it's not SRM. I just think it can't hurt to see if turning SRM yields any change in behavior is all. Every little clue helps, after all. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

01-29-2010, 09:55 AM	#15 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3684	TW, I have played around with SRM quite a bit and yes it will hold 3500rpms in neutral if it is near one of the gates. I as a fun lil habit when coasting in neutral will push the shifter laterally to the lower gears and it will act like it rev'd but I never came even close to a gate... in my case it would hold it for several seconds and then finally relent. I believe with turning the SRM system off while running the car for a few mile then turning it back on will help trouble shoot the issue. For sure I know it is an SRM issue like I stated before. I didnt see that you were at zero mph earlier and after watching the video again I see that. turn off the SRM drive it and see if that fixes the issue, then turn it back on and see if it continues. if that doesnt work unplug the battery for several minutes to let everything die down and then plug the battery back up and try again. This is problem shooting 101... Now you say you arent worried but man seriously you should hear your voice in that video. Im not meaning to sound like a prick or an A$$hole but you sound so worried and like a little b!tch. I dont mean to be rude but take a step out and realize its a machine it may have problems and its not doing it to you on purpose. Its not bad luck either and if the problem persists take it to the dealer this is not that big of a deal! and this coming from 1 of 2 on these forums that has blown a stock motor already! I blew my motor at 10,100 miles and 1/2 mile from the dealership cause the motor was making funny noises. My car has been in more shops for over 6 months than it has been on the road. Just relax and take another video without the "why is this happening to me" attitude... Thanks and we all want to see you enjoying your Z so try these trouble shooting ideas before you shoot them down. Mike __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

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

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