Why Did My Z, Keep Revving? Video.

TheWeatherman · 01-29-2010, 01:32 PM

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

Tyrell Tyson · 01-29-2010, 01:38 PM

You do? hows the ringing sound going mate?

- Ty

Modshack · 01-29-2010, 02:09 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, 02:21 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, 02:44 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, 02:49 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, 03:09 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!

Pushing_Tin · 01-29-2010, 03:27 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.

SiXK · 01-29-2010, 03:33 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, 05:34 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!

spearfish25 · 01-29-2010, 05:38 PM

Keep us posted on the resolution.

I find this issue a bit disturbing 1) with the Toyota recall ongoing and 2) with the fact that my wife would not be well suited to dealing with this issue if she's behind the wheel. If the revs climbed like that on her, I'd guess she'd end up in another guy's bumper or in a ditch. You guys with 7ATs should be a bit concerned too. It's a no brainer going to neutral or clutching if the revs go bonkers in the 6MT. You'll have to have some quick thinking if it does it to you in the 7AT.

jakoye · 01-29-2010, 06:27 PM

Quote:

Originally Posted by spearfish25

Keep us posted on the resolution.
You guys with 7ATs should be a bit concerned too. It's a no brainer going to neutral or clutching if the revs go bonkers in the 6MT. You'll have to have some quick thinking if it does it to you in the 7AT.

I dunno. That was the first thing I thought of (put it in neutral) when something similar happened in my Mustang (gas pedal got stuck on the floor mat). I put that bad boy in neutral right quick!

But then I'm kinda weird in that I think about emergency situations beforehand, such as when I'm about to cross a bridge, I think briefly about how I would escape from my car if it plunged into the water.

Yeah.

AK370Z · 01-30-2010, 06:21 AM

Quote:

Originally Posted by AK370Z

Sorry to hear it. Quick question, if you take the car off the "S Mode", can you replicate such behavior?

TheWeatherman, I asked the following just to make sure it's NOT the SRM that's causing this. Though, after watching your video again, I find it VERY bizarre and I blame a faulty accelerator pedal assembly. (possibly). But, I'm still curious, were you able to replicate the above mentioned problem without SRM?

Quote:

Originally Posted by bullitt5897

TheWeatherman,

I know for a fact why your 370z seems like it is continuing to rev...

Here is why:

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. Now SRM (synchro rev match) only revs when in neutral or at the gate of the next lowest gear. That is your problem... well not a problem just a lil uneducated on the feature. If this bothers you turn off your SRM by pushing the sport button until the little S disappears from your gear indicator. This has nothing to do with your car being warm. Now if you want to try it again leave it in gear this time and just clutch it... I bet you it wont do the rev climb.

So in final your Z is perfectly normal... so stop babying it and drive it like a big boy

Quote:

Originally Posted by m4a1mustang

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.

Quote:

Originally Posted by bullitt5897

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.

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...

Very weird /\..

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.

I will clear up some confusion with a video that I made yesterday. I don't know why Modshack's SRM doesn't do this but almost all members here can say the same thing about neutral drop with SRM on. Bullit, Chrislicks, M41mustang - I think this is EXACTLY what you guys are trying to explain. Take a look

(sorry for the cheesy forum advertisement at the end

. I usually get tons of questions in comments section so I explained everything on the video)

As you can see, if I move the shifter from 6th to Neutral, RPM goes up( just enough for 5th gear) and stays there until I pop it to 5th. BUT, if I move the shifter to the left (while staying in neutral), car thinks I want to downshift even further (3 or 4th gear) and REVS the RPM even more. This is a very normal behavior and as mentioned above almost ALL of the 370Z owners with SRM experience this (except modshack). Modshack, maybe this video will show you what we are trying to explain.

As for OP, sorry we kinda got a little off topic. PLEASE keep us posted on what they find out.

spearfish25 · 01-30-2010, 09:10 AM

Nice demo AK. It makes it pretty clear that Weatherman has a very different issue.

MightyBobo · 01-30-2010, 10:47 AM

OK, sorry if I missed someone recommending this, but I think you guys are over analyzing. I think its probably as simple as a throttle position sensor either being shot, or needing recalibration. There IS a recalibration method if I remember correctly, in the service manual. I dont have access to it at work, though.

01-29-2010, 05:38 PM	#56 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Keep us posted on the resolution. I find this issue a bit disturbing 1) with the Toyota recall ongoing and 2) with the fact that my wife would not be well suited to dealing with this issue if she's behind the wheel. If the revs climbed like that on her, I'd guess she'd end up in another guy's bumper or in a ditch. You guys with 7ATs should be a bit concerned too. It's a no brainer going to neutral or clutching if the revs go bonkers in the 6MT. You'll have to have some quick thinking if it does it to you in the 7AT. __________________ 2013 Cadillac V-Wagon, RIP Z

01-30-2010, 09:10 AM	#59 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Nice demo AK. It makes it pretty clear that Weatherman has a very different issue. __________________ 2013 Cadillac V-Wagon, RIP Z

01-30-2010, 10:47 AM	#60 (permalink)
MightyBobo A True Z Fanatic Join Date: Feb 2009 Location: Las Vegas, NV Posts: 8,465 Drives: No cars; only bikes Rep Power: 52	OK, sorry if I missed someone recommending this, but I think you guys are over analyzing. I think its probably as simple as a throttle position sensor either being shot, or needing recalibration. There IS a recalibration method if I remember correctly, in the service manual. I dont have access to it at work, though. __________________ I don't own a car anymore.

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TheWeatherman Enthusiast Member Join Date: Mar 2009 Location: Milwaukee, WI Posts: 265 Drives: 2009 370Z 6MTw/Sport Rep Power: 16	By the way... I still absolutely love these cars! My Infiniti as well.

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Tyrell Tyson Enthusiast Member Join Date: Jan 2010 Location: EU Posts: 295 Drives: P90 TR Rep Power: 15	You do? hows the ringing sound going mate? - Ty