Rev Limiter?

earwicker7 · 07-09-2009, 03:11 PM

Is there a rev limiter on the 370Z? I'm just wondering because the needle goes towards redline so quickly in 1st and 2nd gears that I may be shifting earlier than I need to, worrying about taking the engine past redline.

RDGR12 · 07-09-2009, 03:24 PM

All cars have rev limiter.

wstar · 07-09-2009, 04:13 PM

Yes, it has a rev limiter. It's still better if you work on your shifting so you don't bang the needle into it all the time.

earwicker7 · 07-09-2009, 04:14 PM

Quote:

Originally Posted by RDGR12

All cars have rev limiter.

Not my 911. A friend blew it up by shifting from 4th to 1st instead of 4th to 5th. I've always been concerned about not going past redline since that incident.

earwicker7 · 07-09-2009, 04:15 PM

Quote:

Originally Posted by wstar

Yes, it has a rev limiter. It's still better if you work on your shifting so you don't bang the needle into it all the time.

So what is the optimal RPM for shifting? Does it vary from gear to gear? I have the automatic transmission, if that matters.

Jordan777er · 07-09-2009, 04:33 PM

It depends on how you drive. If you're just going to the grocery store, there's no need to take it to redline before every shift. I've never driven a 370Z, but I would assume 3,000-3,500 would be a good place to shift for everyday driving.

earwicker7 · 07-09-2009, 04:36 PM

Quote:

Originally Posted by Jordan777er

It depends on how you drive. If you're just going to the grocery store, there's no need to take it to redline before every shift. I've never driven a 370Z, but I would assume 3,000-3,500 would be a good place to shift for everyday driving.

Yeah, usually around 4k or so for regular driving is where I'm at. I'm just wondering about the few times I decide to floor it.

t-ray · 07-09-2009, 04:44 PM

A rev limiter is a computer controlled operation. However, downshifting to a lower gear beyond redline is a mechanical operation. It is physically impossible for the cpu to spin the engine down. It can cut fuel. It can cut the spark. But that's about all.

earwicker7 · 07-09-2009, 05:31 PM

Quote:

Originally Posted by t-ray

A rev limiter is a computer controlled operation. However, downshifting to a lower gear beyond redline is a mechanical operation. It is physically impossible for the cpu to spin the engine down. It can cut fuel. It can cut the spark. But that's about all.

Yeah, I'm not really worried about downshifting; as sport mode automatically shifts down as you come to a standstill (for general stop and go Los Angeles traffic, this is awesome), I only downshift when I'm doing canyon cruising and I pay really close attention to the RPM before I do so.

I'm more concerned with shifting while accelerating. Now that I know I'm not going to drag the engine to 9k, I can pay more attention to shifting based on the feel of the car instead of having my eyes glued to the tach.

By the way, the 911 that my friend blew up was a 1971, so there wasn't an onboard computer... not that it would have helped if you can't control the revs on a downshift.

370Z Purist · 07-10-2009, 04:26 AM

t-ray is completely right. The best a computer would do to save the engine would be to completely shut it down.. but even that would cause the engine to spin while not igniting any material, and inertial weight of the engine parts not being propelled by combustion would likely break several things in the connection from engine to tranny to differential.

The Z has a rev limiter. It's interesting, since if you're barely moving or stopped, the car limits revs at around 4.5k to 5k RPM. At speed, you should be able to break that limit, but you'll still bounce off the 7.5k line. I normally shift at 3.5k to 4.5k, and if I feel like hitting it a little, I keep it at or below 6k. If you really want to short shift and save a little gas, you can hit shifts at 2.5k or 3k.

earwicker7 · 07-11-2009, 01:46 PM

So is there any advantage at all to taking the engine to redline when accelerating? For those of you who track the car, what are your shift points when trying to get the best 0 to 60?

370Z Purist · 07-11-2009, 03:45 PM

The engine doesn't produce any more power past 332 horsepower at the engine at 7000 RPM, and at 6000, it produces about 310 or so at the engine. If you really wanted to take maximum horsepower shifts, you'd have to shift around 6500 or so. Constantly bouncing around and near 7000 RPM is going to roast your engine. I think that the maximum wheel horsepower on stock is around 290 rwhp at 7000 RPM.
Conversely, the engine produces peak torque of 270 ft-lbs at 5200 RPM.

earwicker7 · 07-11-2009, 04:11 PM

Quote:

Originally Posted by 370Z Purist

The engine doesn't produce any more power past 332 horsepower at the engine at 7000 RPM, and at 6000, it produces about 310 or so at the engine. If you really wanted to take maximum horsepower shifts, you'd have to shift around 6500 or so. Constantly bouncing around and near 7000 RPM is going to roast your engine. I think that the maximum wheel horsepower on stock is around 290 rwhp at 7000 RPM.
Conversely, the engine produces peak torque of 270 ft-lbs at 5200 RPM.

Cool, this is what I needed!

I know that constantly redlining is very bad for the engine, but it's really that bad to go to 7k vs 6.5k? I honestly don't get many chances to floor the car; I rarely go above 80mph in Los Angeles traffic. On a good day, I might get one or two instances where there is a short stretch to gun it, and I'll only do this if the car is sufficiently warmed up (200-220 degrees), so realistically, even getting to 7k is going to be a fairly rare occurance, but if it's that bad for the engine, I can limit it to 6.5k.

370Z Purist · 07-11-2009, 07:32 PM

Just have fun but don't beat on the engine just because you can, regardless of whether or not it's broken in.

earwicker7 · 07-11-2009, 09:06 PM

Quote:

Originally Posted by 370Z Purist

Just have fun but don't beat on the engine just because you can, regardless of whether or not it's broken in.

On the contrary, I'm pretty anal about the car. I literally granny it until it hits 180-200 degrees; I know I have people behind me say, "Why is this guy doing 30 mph in a 370Z?" I just think it would be a shame to have a car like this and never have some fun with it

.

Thanks for the advice... it's been very helpful!

07-09-2009, 03:11 PM	#1 (permalink)
earwicker7 Enthusiast Member Join Date: Jun 2009 Location: Burbank, CA Posts: 265 Drives: 09 370Z (maxed out) Rep Power: 16	Rev Limiter? Is there a rev limiter on the 370Z? I'm just wondering because the needle goes towards redline so quickly in 1st and 2nd gears that I may be shifting earlier than I need to, worrying about taking the engine past redline.

07-09-2009, 04:13 PM	#3 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	Yes, it has a rev limiter. It's still better if you work on your shifting so you don't bang the needle into it all the time. __________________ 7AT Track Car! Journal thread / Car setup details

07-09-2009, 04:44 PM	#8 (permalink)
t-ray Base Member Join Date: Apr 2009 Location: bham al Posts: 91 Drives: 05 g sedan 6mt Rep Power: 16	A rev limiter is a computer controlled operation. However, downshifting to a lower gear beyond redline is a mechanical operation. It is physically impossible for the cpu to spin the engine down. It can cut fuel. It can cut the spark. But that's about all. filip00 likes this.

07-10-2009, 04:26 AM	#10 (permalink)
370Z Purist A True Z Fanatic Join Date: Jun 2009 Location: Zion, Illinois Posts: 1,873 Drives: '09 370Z-T BS M6 Rep Power: 19	t-ray is completely right. The best a computer would do to save the engine would be to completely shut it down.. but even that would cause the engine to spin while not igniting any material, and inertial weight of the engine parts not being propelled by combustion would likely break several things in the connection from engine to tranny to differential. The Z has a rev limiter. It's interesting, since if you're barely moving or stopped, the car limits revs at around 4.5k to 5k RPM. At speed, you should be able to break that limit, but you'll still bounce off the 7.5k line. I normally shift at 3.5k to 4.5k, and if I feel like hitting it a little, I keep it at or below 6k. If you really want to short shift and save a little gas, you can hit shifts at 2.5k or 3k. __________________ -Phil "Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."

07-11-2009, 03:45 PM	#12 (permalink)
370Z Purist A True Z Fanatic Join Date: Jun 2009 Location: Zion, Illinois Posts: 1,873 Drives: '09 370Z-T BS M6 Rep Power: 19	The engine doesn't produce any more power past 332 horsepower at the engine at 7000 RPM, and at 6000, it produces about 310 or so at the engine. If you really wanted to take maximum horsepower shifts, you'd have to shift around 6500 or so. Constantly bouncing around and near 7000 RPM is going to roast your engine. I think that the maximum wheel horsepower on stock is around 290 rwhp at 7000 RPM. Conversely, the engine produces peak torque of 270 ft-lbs at 5200 RPM. __________________ -Phil "Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."

07-09-2009, 03:24 PM	#2 (permalink)
RDGR12 Base Member Join Date: Jan 2009 Location: San Bruno, CA Posts: 90 Drives: An Old Beater Rep Power: 16	All cars have rev limiter.

07-09-2009, 04:33 PM	#6 (permalink)
Jordan777er Base Member Join Date: Jun 2009 Location: Goldsboro, NC Age: 36 Posts: 212 Drives: 2005 ZX-6R Rep Power: 16	It depends on how you drive. If you're just going to the grocery store, there's no need to take it to redline before every shift. I've never driven a 370Z, but I would assume 3,000-3,500 would be a good place to shift for everyday driving.

07-11-2009, 01:46 PM	#11 (permalink)
earwicker7 Enthusiast Member Join Date: Jun 2009 Location: Burbank, CA Posts: 265 Drives: 09 370Z (maxed out) Rep Power: 16	So is there any advantage at all to taking the engine to redline when accelerating? For those of you who track the car, what are your shift points when trying to get the best 0 to 60?

07-11-2009, 07:32 PM	#14 (permalink)
370Z Purist A True Z Fanatic Join Date: Jun 2009 Location: Zion, Illinois Posts: 1,873 Drives: '09 370Z-T BS M6 Rep Power: 19	Just have fun but don't beat on the engine just because you can, regardless of whether or not it's broken in. __________________ -Phil "Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."

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