danneth

funny a lad i know says that with his focus ST yet when i came past him with ease with my 150lb of torque i would say the statement went wrong somewhere

owning a CTR you get use to have no torque but ill still race most hot hatchs from 50mph in 5th gear

K-NINE

sorry chip i did mean max rpm,as like you say at peak power you would drop to far down the rev range.

vibrating_cake

At 5252RPM
TORQUE=RPM
if measured in lbft and bhp

so if you make 200lbft of torque at 5252rpm you would make 200bhp

bhp is just a term for the amount of torque per revolution, the more revolutions you have a second, the more BHP you have.
so... on a flat torque curve, e.g. a 5.0 V8
1000rpm = 500lbft torque at this second. you get... 95BHP to use!
3000rpm = 500lbft torque at this second. you get... 285BHP to use!
5000rpm = 500lbft torque at this second. you get... 476BHP to use!
5252rpm = 500lbft torque at this second. you get... 500BHP to use!
7000rpm = 500lbft torque at this second. you get... 666BHP to use!

but on a general engine torque peaks at like 3200 rpm then slowley drops off iirc
power is the amount of force you can spin the rear/front/all4 wheels at
and we all know

force=Mass x acceleration

so a greater force means greater acceleration
so a higer bhp = better acceleration

but, you cant have a higher BHP if you dont have the torque coming from the engine.
so you NEED TORQUE in the RIGHT PLACES to go fast

no point peaking torque at 525.2lbft at 3000rpm and trailing down to 300lbft at 7000rpm because theres no reason to rev!

also, in jap engines, the peak torque is high up in the rev range ~ 6000rpm therefore your torque x rpm= more power = more acceleration
but only at the top of the rev range

so its all about driving style now... do you keep it at high rpm all the time to get anywhere, or do you feel lazy and like to just shove it in 3rd and power away with the same amount of acceleration through the rev range.

so your not looking at
i have a big willy with 500bhp at 9000rpm and 300lbft of torque at 4500rpm
because the guy with 500bhp at 7000rpm and 450lbft of torque at 3000rpm could beat you aslong as a long gearbox is used.

but then theres shift times, shorter shift gearboxes to keep the powerband up longer gearboxes for longer powerbands etc etc etc.
it all depends on the car and the driver.
some drivers can drive faster with more lbft than bhp with a lot of low end torque and not a big power figure up top
others (japs) can drive faster with more BHP than lbft with less low end torque and a lot of high up power.

=)


shit thats long!!
excuse my maths in the middle btw =)

volcomstone411

so if you were to change the engines components to lightened ones, you would allow the engine to produce more torque because the bhp is increased?

AlexF

lightening an engines components will not realse more energy in itself - but the reduced mass will make it easier to accelerate the engine - so a tiny improvment to be had there!

Fast Guy

Isn't that what I said?

I know you wanted C for both end of story, but your statement is abit vague as both B and C have high top speeds (say 160+ and 170+) but C has the highest. B would probably out accelerate C off the line, but then lose out later on.
B could be a WRC car and they go damn fast but tend to be gearing limited at the top end. How would they compare to the old DTM cars which I think were 2.5L 400bhp ish.

m_nettleship

Chip. you remind me of a cucumber.



All Formula Engines are 2.4, Thay all produce about 200lb/s Torque.