Why Did My Z, Keep Revving? Video.

Modshack · 01-28-2010, 11:21 PM

Quote:

Originally Posted by m4a1mustang

If you weren't implicating that I suggested a bat disco in the intersection then I just was confused by the double quote.

No worries...I was using you to reinforce my post! Sometimes it takes a little reinforcement to get the point across.......

m4a1mustang · 01-28-2010, 11:27 PM

Quote:

Originally Posted by Modshack

No worries...I was using you to reinforce my post! Sometimes it takes a little reinforcement to get the point across.......

No prob! I was confused by the double-quote response. Ah... interweb forum technicalities!

370zdub · 01-29-2010, 12:07 AM

Quote:

Originally Posted by Modshack

It's "drive by wire" so no cabes involved. Totally electronic. The VVEL also does a lot of throttling on the car, not just the throttle bodies. Several potential areas that could be causing this.. If a re-set doesn't do it, the dealers diagnostic machine will certainly pinpoint the fault.

I know its drive by wire I just didn't know if there was some cables controlling intake functions. Your response clears that up enough though! Thanks

MeetJoeAsian · 01-29-2010, 01:39 AM

Is it a stuck pedal like Toyota? Best way to find out is let it replicate again, and then try to pull/lift up the accel. pedal...if you find that it stops revving when you pull the pedal up, then it's a stuck pedal...however, it seems it maybe a motor issue since when you put it in gear, it doesn't rev at all...

...and also, does your MPG really read 23.7??? and with a little over half a tank left, your DTE reads 231 miles???

IDZRVIT · 01-29-2010, 08:08 AM

Your ECU has gremlins.

HKYStormFront · 01-29-2010, 08:45 AM

forgive a "dumb question"... just out of curiousity was the car warmed up to normal operating temp when it was doing this?

IDZRVIT · 01-29-2010, 08:51 AM

The oil temp looked low.

bullitt5897 · 01-29-2010, 08:57 AM

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

semtex · 01-29-2010, 09:32 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 . . .

Tyrell Tyson · 01-29-2010, 09:50 AM

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

If you are right i will donkey punch myself right in the balls

- Ty

Modshack · 01-29-2010, 09:59 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, 09:59 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.

m4a1mustang · 01-29-2010, 10:03 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.

TheWeatherman · 01-29-2010, 10:09 AM

I really believe it had nothing to do with the SRM. When the car was stopped, idling, it still idled at around 3,500 RPM. SRM only is effective when the car is in motion. It uses speed and gear position to find it's rev point. If I'm stopped and outside of the car, it shouldn't be revving at 3,500 RPM.

As far as the temperature, when it's this cold, the oil temperatures reflect that. It was in it's normal operating temperature for this ambient temperature. If you drive your car when it's 0-10 degrees down the highway, you'll notice your oil temp will be between 170°-190°F. That's where mine was. Car was out and about for at least 25 minutes when the video was taken. I don't have an oil cooler.

I don't always drop to neutral. When I was coming off of the highway to a stoplight, the car was actually speeding up. I was hitting the brakes in 6th trying to come down from 60MPH when I noticed something was wrong. Hence, nothing to do with SRM. Try it in your car. Go cruising around the city, pop it in neutral, put the stick right in the middle of the gate, don't touch the shifter, and the revs should drop down pretty far... Not 3,500 RPM.

Something was stuck on my machine or not working properly. It scared me at first coming off the highway. It has never done that before. 12,000 miles... I know when something's broken. SRM... No.

m4a1mustang · 01-29-2010, 10:12 AM

Quote:

Originally Posted by TheWeatherman

I really believe it had nothing to do with the SRM. When the car was stopped, idling, it still idled at around 3,500 RPM. SRM only is effective when the car is in motion. It uses speed and gear position to find it's rev point. If I'm stopped and outside of the car, it shouldn't be revving at 3,500 RPM.

As far as the temperature, when it's this cold, the oil temperatures reflect that. It was in it's normal operating temperature for this ambient temperature. If you drive your car when it's 0-10 degrees down the highway, you'll notice your oil temp will be between 170°-190°F. That's where mine was. Car was out and about for at least 25 minutes when the video was taken. I don't have an oil cooler.

I don't always drop to neutral. When I was coming off of the highway to a stoplight, the car was actually speeding up. I was hitting the brakes in 6th trying to come down from 60MPH when I noticed something was wrong. Hence, nothing to do with SRM. Try it in your car. Go cruising around the city, pop it in neutral, put the stick right in the middle of the gate, don't touch the shifter, and the revs should drop down pretty far... Not 3,500 RPM.

Something was stuck on my machine or not working properly. It scared me at first coming off the highway. It has never done that before. 12,000 miles... I know when something's broken. SRM... No.

I think we can rule that out.

I would definitely reset the ECU and see what happens. It could just be some random glitch, but it seems like it may be something more serious.

See how the reset goes and like I said earlier, take it in for service immediately if it doesn't. And obviously, be careful!

01-29-2010, 01:39 AM	#19 (permalink)
MeetJoeAsian Enthusiast Member Join Date: Aug 2009 Location: Houston, TX Posts: 342 Drives: 350Z to G35c to 370Z Rep Power: 16	Is it a stuck pedal like Toyota? Best way to find out is let it replicate again, and then try to pull/lift up the accel. pedal...if you find that it stops revving when you pull the pedal up, then it's a stuck pedal...however, it seems it maybe a motor issue since when you put it in gear, it doesn't rev at all... ...and also, does your MPG really read 23.7??? and with a little over half a tank left, your DTE reads 231 miles??? __________________ http://facebook.com/meetjoeasian

01-29-2010, 08:08 AM	#20 (permalink)
IDZRVIT A True Z Fanatic Join Date: May 2009 Location: Halifax Posts: 1,659 Drives: '13 CTS-V, '76 Vette Rep Power: 27	Your ECU has gremlins. __________________ "America.... still builds rockets!" Vette: 355 cid, 400 rwhp '13 CTS-V Coupe: 6.2L LSA, 556HP

01-29-2010, 08:45 AM	#21 (permalink)
HKYStormFront A True Z Fanatic Join Date: Apr 2009 Location: Greer, SC Posts: 14,954 Drives: 06 Frontier SE 6spd Rep Power: 52	forgive a "dumb question"... just out of curiousity was the car warmed up to normal operating temp when it was doing this? __________________ Patrick // 06 Frontier 6spd Nismosis // Mods: Uprev Tuned @ Z1 Motorsports: 257whp & 292 ft lbs 09 Pontiac G8 GXP // M6 // Sunroof // Tint... For now

01-29-2010, 08:51 AM	#22 (permalink)
IDZRVIT A True Z Fanatic Join Date: May 2009 Location: Halifax Posts: 1,659 Drives: '13 CTS-V, '76 Vette Rep Power: 27	The oil temp looked low. __________________ "America.... still builds rockets!" Vette: 355 cid, 400 rwhp '13 CTS-V Coupe: 6.2L LSA, 556HP

01-29-2010, 08:57 AM	#23 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3682	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 __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

01-29-2010, 09:32 AM	#24 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 33	^ 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, 10:09 AM	#29 (permalink)
TheWeatherman Enthusiast Member Join Date: Mar 2009 Location: Milwaukee, WI Posts: 265 Drives: 2009 370Z 6MTw/Sport Rep Power: 16	I really believe it had nothing to do with the SRM. When the car was stopped, idling, it still idled at around 3,500 RPM. SRM only is effective when the car is in motion. It uses speed and gear position to find it's rev point. If I'm stopped and outside of the car, it shouldn't be revving at 3,500 RPM. As far as the temperature, when it's this cold, the oil temperatures reflect that. It was in it's normal operating temperature for this ambient temperature. If you drive your car when it's 0-10 degrees down the highway, you'll notice your oil temp will be between 170°-190°F. That's where mine was. Car was out and about for at least 25 minutes when the video was taken. I don't have an oil cooler. I don't always drop to neutral. When I was coming off of the highway to a stoplight, the car was actually speeding up. I was hitting the brakes in 6th trying to come down from 60MPH when I noticed something was wrong. Hence, nothing to do with SRM. Try it in your car. Go cruising around the city, pop it in neutral, put the stick right in the middle of the gate, don't touch the shifter, and the revs should drop down pretty far... Not 3,500 RPM. Something was stuck on my machine or not working properly. It scared me at first coming off the highway. It has never done that before. 12,000 miles... I know when something's broken. SRM... No.

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