Viper ACR Revs

M3ZING · 10-12-2016, 09:47 AM

All N/A V10s are high revving why does the Viper V10 only rev to high 7000s?

1MOREMOD · 10-12-2016, 10:04 AM

Cuz it's a 14 liter dump truck motor

kprocivic · 10-12-2016, 10:09 AM

Yea you need smaller liter v10 for those high revs.

Red Bread · 10-12-2016, 10:18 AM

What's the highest redline for a pushrod motor? I'm assuming low 7's?

dkmesa · 10-12-2016, 10:23 AM

Quote:

Originally Posted by M3ZING

All N/A V10s are high revving why does the Viper V10 only rev to high 7000s?

Not all N/A V10s are high revving. For example, the V10 Vipers do not rev very high

M3ZING · 10-12-2016, 10:24 AM

Quote:

Originally Posted by dkmesa

Quote:

Originally Posted by M3ZING

All N/A V10s are high revving why does the Viper V10 only rev to high 7000s?

Not all N/A V10s are high revving. For example, the V10 Vipers do not rev very high

This.

OutlawX3M · 10-12-2016, 11:52 AM

Quote:

Originally Posted by M3ZING

All N/A V10s are high revving why does the Viper V10 only rev to high 7000s?

With 625HP @ 6200rpm and 600tq @ 5000 rpm for the 2017 ACR Viper, why does it need 7k? It's not going to make any more power/tq.

Actually it's rev limited to 6500rpm if I remember correctly.

Nkc · 10-12-2016, 01:19 PM

I have no issues with my low revving dump truck motor lol.

Pparana · 10-12-2016, 01:44 PM

Because it is an outdated monster. Even at 8.4 L it only makes about 74hp a liter. To put that in perspective, most sports cars with NA motors make about 105-115 hp per liter.

The viper was cool, in 1996. It's still cool for the track, pretty timeless there. On the road, no thanks.

pgviper · 10-12-2016, 03:32 PM

Large displacement has its place. More mass to accelerate within the cylinder creates challenges when increasing RPMs. Despite less HP / Liter, the 8.4L V10 produces more torque throughout the rev range along with the same peak horsepower.

I just don't understand the hate of lower redline and HP / Liter ratios.

Red Bread · 10-12-2016, 03:35 PM

There have been a handful of naturally aspirated motors making 115 hp per liter or more and come from Fezza, Porsche or Lamborghini. And all have a fraction of the torque of the Viper lump. The S2000 is about the only approachable recent car to be in that realm.

Saying that most sports cars make 105+hp/l is amusing when about twenty cars in history have made that much per liter.

kprocivic · 10-12-2016, 03:49 PM

Quote:

Originally Posted by Red Bread

There have been a handful of naturally aspirated motors making 115 hp per liter or more and come from Fezza, Porsche or Lamborghini. And all have a fraction of the torque of the Viper lump. The S2000 is about the only approachable recent car to be in that realm.

Saying that most sports cars make 105+hp/l is amusing when about twenty cars in history have made that much per liter.

yea i actually watched a youtube vid on those exact motors last night and it was interesting.

Red Bread · 10-12-2016, 03:50 PM

Quote:

Originally Posted by kprocivic

Quote:

Originally Posted by Red Bread

There have been a handful of naturally aspirated motors making 115 hp per liter or more and come from Fezza, Porsche or Lamborghini. And all have a fraction of the torque of the Viper lump. The S2000 is about the only approachable recent car to be in that realm.

Saying that most sports cars make 105+hp/l is amusing when about twenty cars in history have made that much per liter.

yea i actually watched a youtube vid on those exact motors last night and it was interesting.

I assume exactly zero of them were pushrod motors? Although, amusingly, that would put a Viper right up against 1k hp.

scoobysaurus · 10-13-2016, 05:19 PM

Viper owner here. Most cars won't be worth a dime in a decade when the "low revving dump truck" powered Viper with an 8.4 liter V10, manual transmission, freakishly long hood and massive rear tires is going to be coveted (especially the ACR's) in a world of turbocharged 2 liter AWD automatic autonomous hybrid cars. The fact that Chris Harris loves the Viper and Jason Cammisa (Adam Sandler wannabe) hates it speaks volumes about the character of the car.

OP, to answer your question the Viper doesn't rev as high as other naturally aspirated V10's because it makes almost twice as much torque as any of those motors. I like screaming naturally aspirated motors but I LOVE torque and I love every bit of the 1264 lbft shared between my SL63 and Viper. Both of them redline at around 6500rpm. Different strokes for different folks. If we're going to talk about hp per liter, most modern cars get over 100hp/liter using forced induction, and it's common knowledge that twin turbo Vipers easily put out 1000+ horsepower. If anyone's actually driven a Viper, it sounds menacing as hell like a proper V10 above 4000rpm.

Cheers

NickyC · 10-13-2016, 06:36 PM

Quote:

Originally Posted by Pparana

Because it is an outdated monster. Even at 8.4 L it only makes about 74hp a liter. To put that in perspective, most sports cars with NA motors make about 105-115 hp per liter.

The viper was cool, in 1996. It's still cool for the track, pretty timeless there. On the road, no thanks.

LoL, alrighty then......

ShocknAwe · 10-13-2016, 08:08 PM

Basically the way I understand it...

larger displacement, larger parts, more energy required to turn, more energy required to get the engine to self-turn. Increased strain and resistance exponentially as angular velocity increases, decreased efficiency, thus, low rev limit.

TSM330i · 10-14-2016, 11:57 AM

It doesn't rev because it doesn't HAVE to rev.

645hp and 600 ft lbs. of torque at who cares RPMs. As an actual Viper owner posted above, the "antiquated" V10 in the Viper makes more HP than any other NA V10 out there, plus the fact that it makes about 200 ft lbs. more torque than any of them as well.

Read to educate yourself about this "truck" engine:
http://www.hotrod.com/articles/how-t...ts-horsepower/

The bottom line is the car and the engine perform.

Nkc · 10-14-2016, 03:17 PM

Any gen5 owners here remove their cats or went with a high flow cat? I'm considering the belanger hf cats and exhaust system to prevent the heat buildup and yellowing/bubbling of the paint. Advice?

VRG_135 · 10-14-2016, 03:41 PM

Quote:

Originally Posted by scoobysaurus

Viper owner here. Most cars won't be worth a dime in a decade when the "low revving dump truck" powered Viper with an 8.4 liter V10, manual transmission, freakishly long hood and massive rear tires is going to be coveted (especially the ACR's) in a world of turbocharged 2 liter AWD automatic autonomous hybrid cars. The fact that Chris Harris loves the Viper and Jason Cammisa (Adam Sandler wannabe) hates it speaks volumes about the character of the car.

OP, to answer your question the Viper doesn't rev as high as other naturally aspirated V10's because it makes almost twice as much torque as any of those motors. I like screaming naturally aspirated motors but I LOVE torque and I love every bit of the 1264 lbft shared between my SL63 and Viper. Both of them redline at around 6500rpm. Different strokes for different folks. If we're going to talk about hp per liter, most modern cars get over 100hp/liter using forced induction, and it's common knowledge that twin turbo Vipers easily put out 1000+ horsepower. If anyone's actually driven a Viper, it sounds menacing as hell like a proper V10 above 4000rpm.

Cheers

I hear the Viper is dangerous to drive for beginners because its so much more car than they are used to driving.......

Nkc · 10-14-2016, 04:55 PM

Quote:

Originally Posted by VRG_135

I hear the Viper is dangerous to drive for beginners because its so much more car than they are used to driving.......

I would say that my 1M is more dangerous to drive on track. But for a beginner, even a corolla can be dangerous.

WreckerX5d · 10-16-2016, 01:42 AM

Quote:

Originally Posted by kprocivic

Quote:

Originally Posted by Red Bread

There have been a handful of naturally aspirated motors making 115 hp per liter or more and come from Fezza, Porsche or Lamborghini. And all have a fraction of the torque of the Viper lump. The S2000 is about the only approachable recent car to be in that realm.

Saying that most sports cars make 105+hp/l is amusing when about twenty cars in history have made that much per liter.

yea i actually watched a youtube vid on those exact motors last night and it was interesting.

Was this an Engineering Explained video? Saw that one too.

Vigilante375 · 10-18-2016, 01:38 AM

The ones that rev high are the ones that have lower displacement. A 8.4l V10 isn't going to rev as high as a 5.2l V10 will. To much mass in the engine. That goes for any engine. I4, I6, V6, etc.

I, personally, don't care for high revving engines unless it makes good, usable power across the board.

10-12-2016, 09:47 AM	#1
M3ZING Banned 562 Rep 473 Posts Drives: Audi RS6 C7 Join Date: Dec 2015 Location: Saudi Arabia iTrader: (0)	Viper ACR Revs All N/A V10s are high revving why does the Viper V10 only rev to high 7000s?
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10-12-2016, 10:04 AM	#2
1MOREMOD - 11822 Rep 23,186 Posts Drives: Race car-> Join Date: Mar 2009 Location: check your mirrors iTrader: (5)	Cuz it's a 14 liter dump truck motor
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10-12-2016, 10:09 AM	#3
kprocivic Lieutenant Colonel 822 Rep 1,575 Posts Drives: ecoboost s to the t Join Date: Apr 2014 Location: 92346 iTrader: (7)	Yea you need smaller liter v10 for those high revs.
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10-12-2016, 10:18 AM	#4
Red Bread Major General 4354 Rep 9,136 Posts Drives: Smog machines Join Date: Oct 2008 Location: Austin, TX iTrader: (0)	What's the highest redline for a pushrod motor? I'm assuming low 7's?
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10-12-2016, 01:19 PM	#8
Nkc NOOB 1599 Rep 1,356 Posts Drives: Cars Join Date: Oct 2011 Location: @BMWclassicdivision iTrader: (0)	I have no issues with my low revving dump truck motor lol.
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10-12-2016, 01:44 PM	#9
Pparana Captain 475 Rep 957 Posts Drives: 2015 m235i Join Date: Oct 2014 Location: Jacksonville Fl iTrader: (1)	Because it is an outdated monster. Even at 8.4 L it only makes about 74hp a liter. To put that in perspective, most sports cars with NA motors make about 105-115 hp per liter. The viper was cool, in 1996. It's still cool for the track, pretty timeless there. On the road, no thanks.
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10-12-2016, 03:32 PM	#10
pgviper Captain 289 Rep 833 Posts Drives: X3m40 Join Date: Apr 2012 Location: Long Island, NY iTrader: (0)	Large displacement has its place. More mass to accelerate within the cylinder creates challenges when increasing RPMs. Despite less HP / Liter, the 8.4L V10 produces more torque throughout the rev range along with the same peak horsepower. I just don't understand the hate of lower redline and HP / Liter ratios.
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10-12-2016, 03:35 PM	#11
Red Bread Major General 4354 Rep 9,136 Posts Drives: Smog machines Join Date: Oct 2008 Location: Austin, TX iTrader: (0)	There have been a handful of naturally aspirated motors making 115 hp per liter or more and come from Fezza, Porsche or Lamborghini. And all have a fraction of the torque of the Viper lump. The S2000 is about the only approachable recent car to be in that realm. Saying that most sports cars make 105+hp/l is amusing when about twenty cars in history have made that much per liter.
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10-13-2016, 05:19 PM	#14
scoobysaurus Lieutenant 698 Rep 445 Posts Drives: BMW Join Date: Mar 2016 Location: Desert iTrader: (0) Garage List 2017 Range Rover Sp ... [0.00] 2014 McLaren MP4-12C [0.00] 2016 Dodge SRT Viper [0.00] 2012 BMW 640i F13 [0.00] 2015 Nissan Patrol Y62 [0.00]	Viper owner here. Most cars won't be worth a dime in a decade when the "low revving dump truck" powered Viper with an 8.4 liter V10, manual transmission, freakishly long hood and massive rear tires is going to be coveted (especially the ACR's) in a world of turbocharged 2 liter AWD automatic autonomous hybrid cars. The fact that Chris Harris loves the Viper and Jason Cammisa (Adam Sandler wannabe) hates it speaks volumes about the character of the car. OP, to answer your question the Viper doesn't rev as high as other naturally aspirated V10's because it makes almost twice as much torque as any of those motors. I like screaming naturally aspirated motors but I LOVE torque and I love every bit of the 1264 lbft shared between my SL63 and Viper. Both of them redline at around 6500rpm. Different strokes for different folks. If we're going to talk about hp per liter, most modern cars get over 100hp/liter using forced induction, and it's common knowledge that twin turbo Vipers easily put out 1000+ horsepower. If anyone's actually driven a Viper, it sounds menacing as hell like a proper V10 above 4000rpm. Cheers
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10-13-2016, 08:08 PM	#16
ShocknAwe 1Addict 3690 Rep 8,219 Posts Drives: E82 1er, M57 X5, 964 C4 Join Date: Jul 2012 Location: Charleston iTrader: (22)	Basically the way I understand it... larger displacement, larger parts, more energy required to turn, more energy required to get the engine to self-turn. Increased strain and resistance exponentially as angular velocity increases, decreased efficiency, thus, low rev limit. __________________ 2010 E82 1 Series M Clone Hydra Performance augmented OEM+
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10-14-2016, 11:57 AM	#17
TSM330i 2006 330i, TSM, Black, manual, sport 896 Rep 3,698 Posts Drives: '17 C2, GTI, Z4 3.0si Racecar Join Date: Nov 2005 Location: Chester Springs, PA iTrader: (2)	It doesn't rev because it doesn't HAVE to rev. 645hp and 600 ft lbs. of torque at who cares RPMs. As an actual Viper owner posted above, the "antiquated" V10 in the Viper makes more HP than any other NA V10 out there, plus the fact that it makes about 200 ft lbs. more torque than any of them as well. Read to educate yourself about this "truck" engine: http://www.hotrod.com/articles/how-t...ts-horsepower/ The bottom line is the car and the engine perform. __________________ 2017 Porsche C2 - manual of course 2015 GTI S 2008 BMW Z4 3.0si Coupe - because racecar
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10-14-2016, 03:17 PM	#18
Nkc NOOB 1599 Rep 1,356 Posts Drives: Cars Join Date: Oct 2011 Location: @BMWclassicdivision iTrader: (0)	Any gen5 owners here remove their cats or went with a high flow cat? I'm considering the belanger hf cats and exhaust system to prevent the heat buildup and yellowing/bubbling of the paint. Advice?
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10-18-2016, 01:38 AM	#22
Vigilante375 Major 115 Rep 1,158 Posts Drives: 2012 AW 6M 135i Join Date: Sep 2011 Location: WA iTrader: (0)	The ones that rev high are the ones that have lower displacement. A 8.4l V10 isn't going to rev as high as a 5.2l V10 will. To much mass in the engine. That goes for any engine. I4, I6, V6, etc. I, personally, don't care for high revving engines unless it makes good, usable power across the board.
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