Rev Limiter Sucks Too

spearfish25 · 09-15-2010, 09:05 PM

I got my first experience with the 370Z rev limiter last weekend at an autoX event. Unlike the Porsche GT3 and Corvettes there which bounce off the limiter and maintain power, the stupid Z computer cuts power electronically. You essentially fall on your face as if VDC was activated. Yet another place where the Nissan training wheels aka computer gets in the way. Anyone else notice this before?

m4a1mustang · 09-15-2010, 09:09 PM

Quote:

Originally Posted by spearfish25

I got my first experience with the 370Z rev limiter last weekend at an autoX event. Unlike the Porsche GT3 and Corvettes there which bounce off the limiter and maintain power, the stupid Z computer cuts power electronically. You essentially fall on your face as if VDC was activated. Yet another place where the Nissan training wheels aka computer gets in the way. Anyone else notice this before?

Yes.

You should check out Sport Mode on the Brembo equipped 5.0 Mustangs.

Red370 · 09-17-2010, 05:20 PM

Quote:

Originally Posted by m4a1mustang

Yes.

You should check out Sport Mode on the Brembo equipped 5.0 Mustangs.

I have that too

and I agree

cossie1600 · 09-15-2010, 09:41 PM

I believe my C6 did the same exact thing except it cuts in much harsher. The 370 just sort of dies on you, that's why I believe some of the dead engine problem are related to fuel starve.

Vegitto-kun · 09-16-2010, 06:33 AM

Quote:

Originally Posted by spearfish25

I got my first experience with the 370Z rev limiter last weekend at an autoX event. Unlike the Porsche GT3 and Corvettes there which bounce off the limiter and maintain power, the stupid Z computer cuts power electronically. You essentially fall on your face as if VDC was activated. Yet another place where the Nissan training wheels aka computer gets in the way. Anyone else notice this before?

or how about your learn to shift on time instead of being a typical idiot who forgets to shift and is all RATATATATATATshift.

ChrisSlicks · 09-16-2010, 08:14 AM

Quote:

Originally Posted by Vegitto-kun

or how about your learn to shift on time instead of being a typical idiot who forgets to shift and is all RATATATATATATshift.

In auto-x the transitions are so frequent that it is often not worth changing gears for 2 seconds only to have to change back again. Your hands are very busy on the wheel and changing gears at the wrong moment could cause the rear end to break loose.

ChrisSlicks · 09-16-2010, 08:12 AM

Quote:

Originally Posted by spearfish25

I got my first experience with the 370Z rev limiter last weekend at an autoX event. Unlike the Porsche GT3 and Corvettes there which bounce off the limiter and maintain power, the stupid Z computer cuts power electronically. You essentially fall on your face as if VDC was activated. Yet another place where the Nissan training wheels aka computer gets in the way. Anyone else notice this before?

Your going to lose power no matter what the limiter, the laws of physics dictate it so.

RPMs constant = constant velocity

The way it hits is different which feels weird but the end result is the same.

wilsonp · 09-16-2010, 04:48 PM

Get your limit raised with a tune?

import111 · 09-16-2010, 08:20 PM

Feels about the same in the 370Z as it did in my 05 STi. I also agree with who ever mentioned fuel cut causing engine reliability issues...seems like that could be a problem.

ChrisSlicks · 09-16-2010, 09:39 PM

Quote:

Originally Posted by import111

Feels about the same in the 370Z as it did in my 05 STi. I also agree with who ever mentioned fuel cut causing engine reliability issues...seems like that could be a problem.

I think that is part of the reason Nissan put in a soft limiter, much less damaging than a fuel cut limiter.

christian370z · 09-16-2010, 10:25 PM

I just don't let it hit the rev limit but it feels much more natural to have a 7,750rpm rev limit after my tune since I can aim to shift around 7,500rpm in the quick gears like 1st and 2nd. But the soft limit is more forgiving without a doubt, just try not to keep running up against it for an extended period of time lol.

spearfish25 · 09-17-2010, 01:24 PM

Yep, didn't want to waste time with rapid gear swaps. In the heat of things, it felt more like a power cut but it may just be a power plateau. Given that the Z pulls the best above 5k rpm, hitting the limiter is probably more dramatic than in a car that poops out at higer rpm. All things considered, the Z doesn't enjoy being near the redline anyway. Yeah, she's powerful there, but she heats up like no tomorrow. One 30s autoX run and she was at 240F despite my 24row oil cooler. Fortunately, she cools down just as fast.

ChrisSlicks · 09-17-2010, 01:53 PM

Yes it's just a plateau. But when all that acceleration goes away suddenly it certainly feels like a cut from within the car as from the occupant perspective there is deceleration due to the fact that acceleration ceased. At my auto-x last week I was riding the limiter for several seconds in a couple of spots as it wasn't worth upsetting the car trying to change gear. It is a weird feeling when the cut happens and it is even weirder how perfectly smooth it holds redline RPM, but it does its job correctly.

And yes technically speaking there is a power cut (engine cuts power to maintain constant RPM), but there is no deceleration of the vehicle itself.

wilsonp · 09-17-2010, 04:50 PM

Get an iPhone Autocross app like RaceDataAX and see what is really happening

Even something simple like AccelGraph might be adequate.

09-15-2010, 09:05 PM	#1 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Rev Limiter Sucks Too I got my first experience with the 370Z rev limiter last weekend at an autoX event. Unlike the Porsche GT3 and Corvettes there which bounce off the limiter and maintain power, the stupid Z computer cuts power electronically. You essentially fall on your face as if VDC was activated. Yet another place where the Nissan training wheels aka computer gets in the way. Anyone else notice this before? __________________ 2013 Cadillac V-Wagon, RIP Z

09-16-2010, 04:48 PM	#8 (permalink)
wilsonp A True Z Fanatic Join Date: Jul 2010 Location: Virginia Posts: 1,134 Drives: 2009 Touring Sp Nav Rep Power: 16	Get your limit raised with a tune? __________________ 2014 Cayman S PDK Sport Chrono White/Black Was 2009 370Z Touring Sport+Nav 7AT Metallic Black/Persimmon Was 1991 NSX Auto Black/Black

09-16-2010, 10:25 PM	#11 (permalink)
christian370z A True Z Fanatic Join Date: Jul 2010 Location: Newport Beach Posts: 3,900 Drives: 2010 370Z/Saab 900se Rep Power: 431	I just don't let it hit the rev limit but it feels much more natural to have a 7,750rpm rev limit after my tune since I can aim to shift around 7,500rpm in the quick gears like 1st and 2nd. But the soft limit is more forgiving without a doubt, just try not to keep running up against it for an extended period of time lol. __________________ -320whp / 259wftlbs- SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

09-17-2010, 01:24 PM	#12 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Yep, didn't want to waste time with rapid gear swaps. In the heat of things, it felt more like a power cut but it may just be a power plateau. Given that the Z pulls the best above 5k rpm, hitting the limiter is probably more dramatic than in a car that poops out at higer rpm. All things considered, the Z doesn't enjoy being near the redline anyway. Yeah, she's powerful there, but she heats up like no tomorrow. One 30s autoX run and she was at 240F despite my 24row oil cooler. Fortunately, she cools down just as fast. __________________ 2013 Cadillac V-Wagon, RIP Z

09-17-2010, 01:53 PM	#13 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	Yes it's just a plateau. But when all that acceleration goes away suddenly it certainly feels like a cut from within the car as from the occupant perspective there is deceleration due to the fact that acceleration ceased. At my auto-x last week I was riding the limiter for several seconds in a couple of spots as it wasn't worth upsetting the car trying to change gear. It is a weird feeling when the cut happens and it is even weirder how perfectly smooth it holds redline RPM, but it does its job correctly. And yes technically speaking there is a power cut (engine cuts power to maintain constant RPM), but there is no deceleration of the vehicle itself. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

09-15-2010, 09:41 PM	#4 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 29	I believe my C6 did the same exact thing except it cuts in much harsher. The 370 just sort of dies on you, that's why I believe some of the dead engine problem are related to fuel starve.

09-16-2010, 08:20 PM	#9 (permalink)
import111 Track Member Join Date: Feb 2009 Location: Tucson, AZ. Posts: 622 Drives: 09 Nissan 370Z Rep Power: 191	Feels about the same in the 370Z as it did in my 05 STi. I also agree with who ever mentioned fuel cut causing engine reliability issues...seems like that could be a problem.

09-17-2010, 04:50 PM	#14 (permalink)
wilsonp A True Z Fanatic Join Date: Jul 2010 Location: Virginia Posts: 1,134 Drives: 2009 Touring Sp Nav Rep Power: 16	Get an iPhone Autocross app like RaceDataAX and see what is really happening Even something simple like AccelGraph might be adequate. __________________ 2014 Cayman S PDK Sport Chrono White/Black Was 2009 370Z Touring Sport+Nav 7AT Metallic Black/Persimmon Was 1991 NSX Auto Black/Black Last edited by wilsonp; 09-17-2010 at 04:53 PM.

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