Hp

what does the base 140 HP that the p10 puts out translate into wheel HP? being a novice I was also wondering about the torque that our cars create and how this compares to other cars within its class.....is more torque good?

the sr20 comes with 140hp and i 133ft lb torque

Originally posted by G22DET
the sr20 comes with 140hp and i 133ft lb torque

Typical wheel hp on a Dynojet, corrected for ambient conditions is usually around 120 hp.

Here's my dyno runs on a bone stock 1999 G20t 123.1hp and 119.7tq.

http://www.g20.net/dyno.html

BTW anyone else have dyno charts please send them in!

for an AT, I usually calculate about a 28-30% loss in the tranny, so about 100-104hp at the wheels. damn, no wonder so slow. hahaha. :D but I never speed with this car, so 104hp ain't bad at all. its a classy good lookin car. :p the AT itself is not great on the P11...kinda sticky when the AC comes on. wish they would've made it a sequential shift.

Not exactly a stock dyno chart, but this shows two different levels of mods... slightly modified, and slightly more modified :-P I'd guess around 120hp stock (+-5hp depending on tune), like Geo said. 5-spd of course, auto would be lower.

http://groups.yahoo.com/group/Team-NISMO-AZ/files/Justin/dyno%20141.jpg

Hope this helps...

Originally posted by uclandru
what does the base 140 HP that the p10 puts out translate into wheel HP? being a novice I was also wondering about the torque that our cars create and how this compares to other cars within its class.....is more torque good?

Torque provides acceleration. The engine's torque is transferred to the pavement as a force from the tire tread. Hp accounts for the top end speed. But in order to get up speed, torque is needed (which provides the acceleration). You can have 1,000,000 Hp in you car's engine, but if it has 0 torque, its not gonna move. Hope this helps

Actually horsepower if a function of torque. It's impossible to have 0 torque and 1,000,000 horsepower or any hp or that matter. Torque is a force and horsepower is a measurement of the amount of work done by an object.

There is a formula that calcutates hp based on torque at a certain RPM. If you notice EVERY dyno chart the hp and torque cross at exactly 5252 rpm.

I've had a couple brews at this point so someone please correct me if I'm mistaken.

I agree with what you you say. I think this HP and Torque thing will always lead to some confusion.

I have read a lot about this and I still have trouble getting my head around it sometimes.

From what I gather the following is generally true:

Torque figures are more revealling than HP.
It is better for an engine to develope max Torque at high RPM because car designers can always take advantage of engine gearing to produce performance.
Because max torque is developed by different engines at different RPM we can translate it to HP in an atempt to compare like with like.
A flatter torque curve is more useful for general everyday driving but not necessarily for racing.

Correct me where you think I am wrong.

Originally posted by G-Forces
Actually horsepower if a function of torque. It's impossible to have 0 torque and 1,000,000 horsepower or any hp or that matter. Torque is a force and horsepower is a measurement of the amount of work done by an object.

There is a formula that calcutates hp based on torque at a certain RPM. If you notice EVERY dyno chart the hp and torque cross at exactly 5252 rpm.

I've had a couple brews at this point so someone please correct me if I'm mistaken.

You've got it pretty well Jason.

Horsepower is indeed a function of torque.

HP = (Torque x rpm)/5252

Therefore, you can see that horsepower and torque are inseparable.

What confuses most people is looking at peak figures. The problem is, peak figures really don't tell you an awful lot. Area under the curve is most important.

An engine with more hp at the same rpm will have more torque at that rpm as well, regardless of what the peak torque is for both engines.

Power, and by default, horsepower, is work performed over time. Therefore, a car with greater area under the hp curve (because peak is mostly trivia) can perform the same amount of work faster than a car with less hp.

This may not be 100% correct from an engineering standpoint, but close enough for this discussion and hopefully it illustrates the issues a little better.