View Thread: Is this Correct?


Carlos Carrera
is this correct?
(from HSW site)

Another thing you can see from a car's horsepower curve is the place where the engine has maximum power. When you are trying to accelerate quickly, you want to try to keep the engine close to its maximum H O R S E P O W E R point on the curve. That is why you often downshift to accelerate -- by downshifting, you increase engine rpm, which typically moves you closer to the peak horsepower point on the curve. If you want to "launch" your car from a traffic light, you would typically rev the engine to get the engine right at its P E A K H O R S E P O W E R rpm and then release the clutch to dump maximum power to the tires.


i thought that for launch the car or accelerate quickly u need to start in the PEAK Torque point.. :eek:

Sia Bani
Ya, I thoguht it was the peak torque point as well...

Rotary Boy
thy are righting an article for idiots who are only impressed witht he word horsepower.

Sia Bani
true true...but rb...did you notice how you just wrote "writing".

Horus
:eek:

Rotary Boy
damnit.

I suck

911GT2
Peak horsepower is where you want to be.

Note that F1 cars rev near peak hp not peak torque.

Sia Bani
Originally posted by Rotary Boy
damnit.

I suck

no worries... I must have written "definately" instead of "definitely" for at least 4 months on here, until I looked at it twice one day and realized what a douchebag I was.

FYRHWK1
Tricky way of wording it, the highest point of acceleration IS at your torque peak, and you downshift to gain mechanical advantage of the shorter gear ratio, I don't know who's writing for them but he needs some lessons. What you do do though, is gear your car to stop revving at your HP peak, thats the highest point of torque and RPM that you can use before you simply replace the lost torque from the engine with gearing without actually gaining wheel torque. Basically though, HP itself doesn't move your car, but it is a good point to stop revving, as to why cars continue on past that peak I have no clue. Torque is nothing without RPMs, so you could try to use HP, but that's misleading as well, especially since it doesnt bring gear ratios into it.

Carlos Carrera
Originally posted by 911GT2
Peak horsepower is where you want to be.

Note that F1 cars rev near peak hp not peak torque.

mmm do u have an F1 engine graph?

Pennzoil GT-R
F1 cars only make about 300lb/ft of torque, and some are at almost 900bhp. They rely on revs and being in the right gear at the right time to access the horsepower, the torque doesnt matter so much to them.

Pennzoil GT-R
Originally posted by Carlos Carrera
mmm do u have an F1 engine graph?

you'll be lucky to get any sort of modern F1 engine dyno graph.

FYRHWK1
Originally posted by Pennzoil GT-R
F1 cars only make about 300lb/ft of torque, and some are at almost 900bhp. They rely on revs and being in the right gear at the right time to access the horsepower, the torque doesnt matter so much to them.

Without the torque, there's nothing for the gears to multiply, in those cars 1 ft lb can be over 40 at the wheels, the more they can get the better. If they didn't add torque when modifying the motors they'd be no faster with a new engine over an old.

Pennzoil GT-R
Originally posted by FYRHWK1
Without the torque, there's nothing for the gears to multiply, in those cars 1 ft lb can be over 40 at the wheels, the more they can get the better. If they didn't add torque when modifying the motors they'd be no faster with a new engine over an old.

which is why the Ferrari is as quick as the others. Supposedly its down on horsepower but has more torque than the others.