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Unread 04-03-2010, 02:41 PM   #1
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Default torque or power?

hey what's up, quick question here.

My buddy's parents are buying him an Audi A4 with a 6 cyclinder engine. The car has roughly 250hp iirc. Now my buddy was going around my school boasting about how his car could dust some of the teacher's cars, until i said that my mom's could beat it and my dad's would destroy it.

Now my mom's car is a 1986 Camaro Irocz w/ 5.0L V8 and an automatic trannie (200hp).
My buddy's car (to be) is an Audi A4 (V6) with an automatic trannie as well, but i can't rememeber how much horsepower, i just remember 250 being thrown around.
My dad's car is a 1986 Corvette w/ 4 speed manual transmission, 5.7L V8


Now this got me thinking. In drag racing, is Torque more important or is horsepower. Because the Corvette has a metric tonne of power in the low end, like my dad opened it up and it felt like i was in the trunk. But it only has like 240hp. Where as i believe the A4 has 250 and a V6. The camaro rips too, but again it's automatic so it isn't as jumpy
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Unread 04-03-2010, 02:48 PM   #2
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torque is good off the line, HP for the long shot. My car has good torque for the lack of power (I can keep up with a civic SI until the VTEC kicks in) But I'm dead after 40.
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Unread 04-03-2010, 02:49 PM   #3
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Torque is what accelerates you. Horsepower is what keeps you going. Without torque, Horsepower is useless, and without torque horsepower is useless.

If his audi is FWD, the Corvette will destroy it. Either the Audi lacks enough torque to beat it, or it has the torque and just spins the wheels. The Vette, being RWD, will have traction come to it much easier when accelerating, and being a 350 it has plenty of torque, so it should win a 1/4 drag pretty easily.

Motorbike engines make tons of horsepower. 200-300HP. But they do it by revving like crazy, they have VERY little torque. Put one in a car and the car is sluggish because the engine has to struggle just to move the car. Either that or it's given crazy gearing and many gears, losing time during shifts. The car's original engine may have only made 150HP, but it made over twice the torque the motorbike engine makes, so it moved the car quite easily.


The forumla that calculates HP is as follows:

HP = rpm x T(torque)
5252(constant)
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Unread 04-03-2010, 02:59 PM   #4
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Quote:
Originally Posted by TestECull View Post
Torque is what accelerates you. Horsepower is what keeps you going. Without torque, Horsepower is useless.

If his audi is FWD, the Corvette will destroy it. Either the Audi lacks enough torque to beat it, or it has the torque and just spins the wheels. The Vette, being RWD, will have traction come to it much easier when accelerating, and being a 350 it has plenty of torque, so it should win a 1/4 drag pretty easily.

Motorbike engines make tons of horsepower. 200-300HP. But they do it by revving like crazy, they have VERY little torque. Put one in a car and the car is sluggish because the engine has to struggle just to move the car. Either that or it's given crazy gearing and many gears, losing time during shifts. The car's original engine may have only made 150HP, but it made over twice the torque the motorbike engine makes, so it moved the car quite easily.


The forumla that calculates HP is as follows:

HP = rpm x T(torque)
5252(constant)
Audi's are AWD for the majority, the only FWD I can think of here in the U.S. is the Audi TT (AWD optional) but the A4 V6 can have anywhere between 220HP to 265HP depending on the year it was made.

Regardless, the horsepower his Audi may have might not be all that great because those cars are pretty heavy, so off the line he might lose, but in the end he'd probably catch up.

Power/Weight ratio , I have no idea how much the Vette and the Camaro weigh but chances are, its probably less than that Audi.
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Unread 04-03-2010, 03:19 PM   #5
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Quote:
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Torque is what accelerates you. Horsepower is what keeps you going. Without torque, Horsepower is useless, and without torque horsepower is useless.
wat

I have nothing to add to this discussion, so I'll point out TestE's silliness.
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Unread 04-03-2010, 03:24 PM   #6
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What silliness? Without them both you have no real power. All the torque in the world will let you pull mountains off their foundations but you'll be lucky to maintain highwy speeds. Just look at 17 wheelers, they pack between 1500 and 3250 FT LBs of torque at the flywheel, but their HP is only in the 350-650HP range. As such they can pull 80,000 pounds up a hill, but they can barely maintain 70MPH when so loaded(And fail to do so entirely when they hit hills, that's why they slow down). They have boatloads of torque but no HP. All the horsepower in the world is nice, but you need a downhill run to accelerate with any sort of impetus.
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Unread 04-03-2010, 03:31 PM   #7
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You're right, if you mean having absolutely Zero HP/Zero Torque in each condition then yes its true.

However, if you take a F1 car, those have about 700HP (Don't quote me on this) and about 200 lb/ft of torque due to the small displacement engines they use. This is why they always get off to a slow start because if they just stomp it the wheels will spin and the car will lose control, after they build up speed/down force they can gun it and initiate flight . But this is a special condition lol, our every day cars are nowhere near what an F1 car is.

/end irrelevant post.
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Unread 04-03-2010, 04:00 PM   #8
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@testecull, you said teh same thing twice.
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Unread 04-03-2010, 04:29 PM   #9
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My truck has 160 HP and 300 lb ft, It pulls up to about 100MPH and cant keep climbing...
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Unread 04-03-2010, 06:31 PM   #10
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Quote:
Originally Posted by cs_maan View Post
You're right, if you mean having absolutely Zero HP/Zero Torque in each condition then yes its true.

However, if you take a F1 car, those have about 700HP (Don't quote me on this) and about 200 lb/ft of torque due to the small displacement engines they use. This is why they always get off to a slow start because if they just stomp it the wheels will spin and the car will lose control, after they build up speed/down force they can gun it and initiate flight . But this is a special condition lol, our every day cars are nowhere near what an F1 car is.

/end irrelevant post.

Actually, F1 cars have closer to 500FT LBs. The mechanical grip their huge rear tires generates simply could not be overpowered by a measly 200FT Lbs, not to mention the cars only weigh between 1500 and 1800 pounds(Depending on fuel load).
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My rigs:

1985 Ford F150 | 4x2 | 300ci OHV inline six | 4-speed OD manual | 310K | No power brakes | Running 100% - It hasn't driven this good in 15 years!

1984 Ford F150 | 4x2 | 300ci six | granny four | 3.55 rear end | 210K | Brakes shot. Rear drums are doing most of the work. Not fit to drive due to that.
1997 Ford Explorer XLT | 4.0L Vulcan V6 | 5-speed automatic | shift-on-the-fly 4WD | 210,000 miles | Running 95% - Needs brakes on all four corners + bald tires
1989 Ford F150 | 300cid six...again | 5-speed | 4x4 | 160K | Needs brakes done as well. Oi!

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