Dont understand (Horsepower vs Torque)

RiCharlie · 08-02-2012, 07:29 PM

Hi

I thought horsepower was what gave a car torque,..so how come I see this:

The standard Genesis engine is a direct-injected 3.8-liter V6 that produces 333 horsepower and 291 lb-ft of torque.

Nissan z 332 horsepower and 270 lb-ft of torque

Can someone give me a simple explanation of why two engines have the same horsepower and different torque?

bluenoser · 08-02-2012, 07:36 PM

Quote:

Originally Posted by RiCharlie

Hi

I thought horsepower was what gave a car torque,..so how come I see this:

The standard Genesis engine is a direct-injected 3.8-liter V6 that produces 333 horsepower and 291 lb-ft of torque.

Nissan z 332 horsepower and 270 lb-ft of torque

Can someone give me a simple explanation of why two engines have the same horsepower and different torque?

Horsepower is a product of torque and rotational speed (RPM). So if the engines have different torque curves the horsepower could be different. The equation is: HP = Torque x RPM ÷ 5252

So the genesis makes higher torque at lower RPM compared to the Z.

KaienZ34 · 08-02-2012, 07:40 PM

Torque is what you feel when you accelerate it's what pushes you back in your seat.

redline727 · 08-02-2012, 07:41 PM

Short answer, its how the heads are designed and how the manufacturer wants the power curve to be also combined with the bore and stroke and compression. (since they're both NA) if you were comparing numbers between NA and FI I would have a different answer. What bluenoser said is the math part of the answer

I would also look at where the peak power is and what they rev to. I would be curious to see a Dyno sheet from the genesis. I don't wanna get into a debate over numbers but comparing those vehicles is gonna come down to how it drives. Seems to me Hyundai tweaked whatever they could to make it even more competitive on paper to gain more interest in the model since its comparitively priced to the 370

bluenoser · 08-02-2012, 07:42 PM

Quote:

Originally Posted by bluenoser

Horsepower is a product of torque and rotational speed (RPM). So if the engines have different torque curves the horsepower could be different. The equation is: HP = Torque x RPM ÷ 5252

So the genesis makes higher torque at lower RPM compared to the Z.

That might not explain it very well actually. The HP is actually a peak HP that only happens at one particular RPM. So the genesis and Z can make the same HP but at different RPMs. If you have a torque curve you can calculate what the HP curve is by that equation.

KaienZ34 · 08-02-2012, 07:43 PM

What Is Torque?

This one has a cool animated engine.

http://auto.howstuffworks.com/auto-p...tion/fpte4.htm

dmhenderson · 08-02-2012, 07:44 PM

Just remember that there are multiple factors to bear in mind when comparing the relative speeds of two cars in terms of "my car is faster than yours". Weight, HP, and torque are your big 3 in a straight line.

To use your example:
stock nismo 370z 0-60: ~4.4 sec
quarter mile: 13 sec

stock hyundai genesis R-Spec: 0-60 ~4.7sec
quarter: 13.3

dmhenderson · 08-02-2012, 07:45 PM

Listen to the guys above though they explained it better tbh.

lemon-fresh · 08-02-2012, 07:55 PM

genesis (and some 370) specs seem wayyyy off in this thread.

Hyundai Genesis Coupe - Wikipedia, the free encyclopedia

lemon-fresh · 08-02-2012, 07:56 PM

Quote:

Originally Posted by RiCharlie

Hi

I thought horsepower was what gave a car torque,..so how come I see this:

The standard Genesis engine is a direct-injected 3.8-liter V6 that produces 333 horsepower and 291 lb-ft of torque.

Nissan z 332 horsepower and 270 lb-ft of torque

Can someone give me a simple explanation of why two engines have the same horsepower and different torque?

They don't have the same horsepower... Mystery solved!

KaienZ34 · 08-02-2012, 08:18 PM

Quote:

Originally Posted by lemon-fresh

genesis (and some 370) specs seem wayyyy off in this thread.

Hyundai Genesis Coupe - Wikipedia, the free encyclopedia

Of course they are off it's wikipedia.

red6spd · 08-02-2012, 08:20 PM

Larger engine and DI makes only 1hp more and 20tq more... Good job Hyundai?

lemon-fresh · 08-02-2012, 08:56 PM

Yup, pretty amazing, ha!

MattP725 · 08-02-2012, 08:58 PM

Not that it answers your question but a Genesis is not going to beat a Z even with more torque... read any review of the car... they are generally underwhelming.

lemon-fresh · 08-02-2012, 08:59 PM

Quote:

Originally Posted by KaienZ34

Of course they are off it's wikipedia.

Ok, New Hyundai Genesis Coupe 2013, 2.0T, 3.8, 3.8GT - Luxury Sports Car - Affordable Sports Car

08-02-2012, 07:29 PM	#1 (permalink)
RiCharlie Track Member Join Date: Oct 2010 Location: Johnston RI Posts: 857 Drives: 370 Touring Spt A/t Rep Power: 15	Dont understand (Horsepower vs Torque) Hi I thought horsepower was what gave a car torque,..so how come I see this: The standard Genesis engine is a direct-injected 3.8-liter V6 that produces 333 horsepower and 291 lb-ft of torque. Nissan z 332 horsepower and 270 lb-ft of torque Can someone give me a simple explanation of why two engines have the same horsepower and different torque?

08-02-2012, 07:40 PM	#3 (permalink)
KaienZ34 A True Z Fanatic Join Date: Oct 2009 Location: LA. not L.a. Posts: 21,652 Drives: Z34 Tour/Sport Rep Power: 177	Torque is what you feel when you accelerate it's what pushes you back in your seat. __________________ *"These Violent Delights Have Violent Ends"* http://www.the370z.com/members/kaienz34-albums-z34.html

08-02-2012, 07:41 PM	#4 (permalink)
redline727 Base Member Join Date: Jun 2011 Location: RVA Posts: 203 Drives: '13 MUSTANG GT 6MT Rep Power: 13	Short answer, its how the heads are designed and how the manufacturer wants the power curve to be also combined with the bore and stroke and compression. (since they're both NA) if you were comparing numbers between NA and FI I would have a different answer. What bluenoser said is the math part of the answer I would also look at where the peak power is and what they rev to. I would be curious to see a Dyno sheet from the genesis. I don't wanna get into a debate over numbers but comparing those vehicles is gonna come down to how it drives. Seems to me Hyundai tweaked whatever they could to make it even more competitive on paper to gain more interest in the model since its comparitively priced to the 370 __________________ 2013 Ford Mustang GT 5.0 6MT ROUSH intake \| ROUSH axle back \| ROUSH shift knob \| ROUSH coil covers 2009 NISSAN 370Z SOLD Last edited by redline727; 08-02-2012 at 07:48 PM.

08-02-2012, 07:43 PM	#6 (permalink)
KaienZ34 A True Z Fanatic Join Date: Oct 2009 Location: LA. not L.a. Posts: 21,652 Drives: Z34 Tour/Sport Rep Power: 177	What Is Torque? This one has a cool animated engine. http://auto.howstuffworks.com/auto-p...tion/fpte4.htm __________________ *"These Violent Delights Have Violent Ends"* http://www.the370z.com/members/kaienz34-albums-z34.html

08-02-2012, 07:44 PM	#7 (permalink)
dmhenderson A True Z Fanatic Join Date: Feb 2011 Location: Maryland Posts: 5,930 Drives: AWD TT 370z Rep Power: 26	Just remember that there are multiple factors to bear in mind when comparing the relative speeds of two cars in terms of "my car is faster than yours". Weight, HP, and torque are your big 3 in a straight line. To use your example: stock nismo 370z 0-60: ~4.4 sec quarter mile: 13 sec stock hyundai genesis R-Spec: 0-60 ~4.7sec quarter: 13.3 __________________

08-02-2012, 07:45 PM	#8 (permalink)
dmhenderson A True Z Fanatic Join Date: Feb 2011 Location: Maryland Posts: 5,930 Drives: AWD TT 370z Rep Power: 26	Listen to the guys above though they explained it better tbh. __________________

08-02-2012, 07:55 PM	#9 (permalink)
lemon-fresh Enthusiast Member Join Date: Mar 2012 Location: Calgary Age: 39 Posts: 471 Drives: 09 370z Rep Power: 13	genesis (and some 370) specs seem wayyyy off in this thread. Hyundai Genesis Coupe - Wikipedia, the free encyclopedia

08-02-2012, 08:20 PM	#12 (permalink)
red6spd A True Z Fanatic Join Date: Apr 2010 Location: Long Island NY Posts: 3,277 Drives: 2010 Z Coupe M6 SPT Rep Power: 21	Larger engine and DI makes only 1hp more and 20tq more... Good job Hyundai? __________________ 2010 Base+Sport 6spd: Stillen G3, FI Non-Resonated CBE, FI Non-Resonated Test Pipes, UpRev Tuned, Custom 24R Oil Cooler, JDM Rear Fog-OEM Harness. ???Whp ???WTQ (Will find out come spring time)

08-02-2012, 08:56 PM	#13 (permalink)
lemon-fresh Enthusiast Member Join Date: Mar 2012 Location: Calgary Age: 39 Posts: 471 Drives: 09 370z Rep Power: 13	Yup, pretty amazing, ha!

08-02-2012, 08:58 PM	#14 (permalink)
MattP725 A True Z Fanatic Join Date: May 2011 Location: Toms River, NJ Posts: 1,904 Drives: 2010 40th Rep Power: 16	Not that it answers your question but a Genesis is not going to beat a Z even with more torque... read any review of the car... they are generally underwhelming.

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