Why Did My Z, Keep Revving? Video.

bullitt5897 · 01-29-2010, 07:57 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

Tyrell Tyson · 01-29-2010, 08:50 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

TheWeatherman · 01-29-2010, 09:09 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, 09:12 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!

TheWeatherman · 01-29-2010, 09:12 AM

M4 Mustang is right. SRM doesn't act like that. It sounds like you drive like me. When the revs get too low, and I'm coming to a stop, I drop it to neutral in the middle of the shift gate. Like Mustang said, if I start hinting that I'm heading toward a gear, it will aggresively blip at me. This was just a constant rev that wouldn't go down. Thanks for backing that up M4.

I should reset the car, or maybe it has a code stored and I should take it in. Hmmmm.

semtex · 01-29-2010, 09:14 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.

Why don't you just try turning it off to be sure? I mean, would it really hurt anything just to give it a shot in the spirit of process of elimination? Also, if your car was speeding up when you were coming off the highway, that would actually cause SRM to hold the revs higher, as the faster you're going when you drop to a lower gear, the higher the revs need to be for a smooth match.

TheWeatherman · 01-29-2010, 09:16 AM

Quote:

Originally Posted by semtex

Why don't you just try turning it off to be sure? I mean, would it really hurt anything just to give it a shot in the spirit of process of elimination? Also, if your car was speeding up when you were coming off the highway, that would actually cause SRM to hold the revs higher, as the faster you're doing when you drop to a lower gear, the higher the revs need to be for a smooth match.

But I didn't downshift (In 6th) and was completely off the throttle. That system knows that and won't intervene in that situation. I'm positive it wasn't SRM.

semtex · 01-29-2010, 09:22 AM

Quote:

Originally Posted by TheWeatherman

But I didn't downshift (In 6th) and was completely off the throttle. That system knows that and won't intervene in that situation. I'm positive it wasn't SRM.

Yep, I see what you're saying. But I guess what I'm trying to say is this. It definitely wasn't SRM in the context of what SRM is supposed to do. But what if it's a malfunctioning SRM? What if you have a malfunctioning SRM that thinks you downshifted even when you didn't, for instance? You could disconnect the battery, and that might (indeed hopefully) fix it. But unless you try turning the SRM off first to see if it changes anything, then for all we know, the battery disconnect fixed the problem by rebooting a faulty SRM. Of course, at that point if it fixes your problem it doesn't really matter right? I guess I'm just being anal about trying to hone in on the root cause.

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.

01-29-2010, 07:57 AM	#1 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3684	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*

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01-29-2010, 09:09 AM	#3 (permalink)
TheWeatherman Enthusiast Member Join Date: Mar 2009 Location: Milwaukee, WI Posts: 265 Drives: 2009 370Z 6MTw/Sport Rep Power: 18	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.

01-29-2010, 09:12 AM	#5 (permalink)
TheWeatherman Enthusiast Member Join Date: Mar 2009 Location: Milwaukee, WI Posts: 265 Drives: 2009 370Z 6MTw/Sport Rep Power: 18	M4 Mustang is right. SRM doesn't act like that. It sounds like you drive like me. When the revs get too low, and I'm coming to a stop, I drop it to neutral in the middle of the shift gate. Like Mustang said, if I start hinting that I'm heading toward a gear, it will aggresively blip at me. This was just a constant rev that wouldn't go down. Thanks for backing that up M4. I should reset the car, or maybe it has a code stored and I should take it in. Hmmmm.

01-29-2010, 12:32 PM	#12 (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.

01-29-2010, 12:38 PM	#13 (permalink)
Tyrell Tyson Enthusiast Member Join Date: Jan 2010 Location: EU Posts: 295 Drives: P90 TR Rep Power: 17	You do? hows the ringing sound going mate? - Ty