Another example of.....pulling power = torque x engine revolution ===> (hp = Tq x rpm)
U are cruising behind a car , say u are doing 60kmh at 4th gear n 2000rpm,
then u decide to overtake, if u simply floor the pedal without shiftdown,
the car pull slowly, since at that rpm it has low power (pwr= Tq x 2000).
But what if u shiftdown to 2nd n yr engine rpm jump to 4000rpm,
then u floor the pedal, of course u will feel much better pull,
since at that rpm it has almost twice power than at 2000rpm (pwr = Tq x 4000).
To simplify, i assume engine torque is same at all rpm, which is not in real life,
most single cam have max torque at low rpm, turbo at middle rpm, and dohc at high rpm,
i said most of them, not all.
The stronger pull u feel is not because u downshift,
it is actually because yr rpm is higher, means yr engine spin faster,
and make more power. Go start yr car n try it.
Some say high torque is important, it is extremely correct, since
high torque engine will have high power due to, pwr = big torque x rpm
but high rpm engine also will have high pulling power due to, pwr = torque x high rpm
Example: compare car A power (300Tq x 6000rpm) vs car B power (200Tq x 9000rpm),
both will have almost same pulling power.
Thats why on u-tube Best Motoring race video show
stock honda integra dc5 (2.0L n/a - low torque high rpm engine) can pull side by side
at straight line with stock nissan silvia (2.0L turbo - high torque low rpm engine).
Also on u-tube u can see drag race, b16b (1.6L n/a - low torque high rpm engine) pulls almost
side by side with 4g93t (1.8L turbo - high torque low rpm engine).
I'm just trying to explain.......
Both big torque n high rpm is important factor to have a big pulling power.
Tired already......need to sleep...........zzz
U are cruising behind a car , say u are doing 60kmh at 4th gear n 2000rpm,
then u decide to overtake, if u simply floor the pedal without shiftdown,
the car pull slowly, since at that rpm it has low power (pwr= Tq x 2000).
But what if u shiftdown to 2nd n yr engine rpm jump to 4000rpm,
then u floor the pedal, of course u will feel much better pull,
since at that rpm it has almost twice power than at 2000rpm (pwr = Tq x 4000).
To simplify, i assume engine torque is same at all rpm, which is not in real life,
most single cam have max torque at low rpm, turbo at middle rpm, and dohc at high rpm,
i said most of them, not all.
The stronger pull u feel is not because u downshift,
it is actually because yr rpm is higher, means yr engine spin faster,
and make more power. Go start yr car n try it.
Some say high torque is important, it is extremely correct, since
high torque engine will have high power due to, pwr = big torque x rpm
but high rpm engine also will have high pulling power due to, pwr = torque x high rpm
Example: compare car A power (300Tq x 6000rpm) vs car B power (200Tq x 9000rpm),
both will have almost same pulling power.
Thats why on u-tube Best Motoring race video show
stock honda integra dc5 (2.0L n/a - low torque high rpm engine) can pull side by side
at straight line with stock nissan silvia (2.0L turbo - high torque low rpm engine).
Also on u-tube u can see drag race, b16b (1.6L n/a - low torque high rpm engine) pulls almost
side by side with 4g93t (1.8L turbo - high torque low rpm engine).
I'm just trying to explain.......
Both big torque n high rpm is important factor to have a big pulling power.
Tired already......need to sleep...........zzz
