leeps

Hi All

Was wondering if someone can clear something up for me.
Had my car dynod and it came out at 137 kw ... now I know this
can't be engine power output cos it starts at 160 kw

Is there a calculation to work out how u get from one to the other.
I think one is called kw at flywheel and the other at the wheels .. ?? not sure

Then how do you work out KW to HP is it a factor of 1.338 ???

Do all dynos measure power at the flywheel ... ie the lower amount ??

Any help is much appreciated ... thanks (H)

leeps

The_Judge

1kw = 1.341hp

dan_swede

Some dynos mesure kw/hp at the wheels, some at flywheel. Depends on brand and the dynotesters settings.
In your case you mesured 137kw and that spuld be at the wheels.
I use 1kw = 1.36hp
About 10-15% is a drivetrain loss in 4wd cars

160kw is manufactures in engine power.
160 x 1.36 = 218 hp engine power
137 x 1.36 = 186hp at the wheels
Any help?

jjones

isn't it more like 25-30% loss? 10-15 sounds way too low - more like FWD loss.

Famine

^ Most of what he said, but

1kW = 1.341hp
1hp = 0.7457kW
1PS = 0.986hp - Pferdenstarke, or "Horse power", the metric version of hp
1hp = 1.014PS
1PS = 0.7353kW
1kW = 1.360PS - hence dan_swede's conversion factor above.

1hp = power required to raise 550lb vertically through 1 foot in 1 second
1PS = power required to raise 75kg vertically through 1 metre in 1 second

SO...

160 engine kW = 214.5 engine hp = 217.6 engine PS
137 wheel kW = 183.7 wheel hp = 186.3 engine PS

Anyone bored yet?

prana

once you leave school, youll never used those numbers ever again

leeps

thanks for the replies guys

this is what i know

110 kw at the wheels = 160 kw engine output ...
therefore 137 kw at the wheels should be around 195 kw engine output
( i know that a lot of power is lost through the drivetrain due to 4wd)
195 kw = 263 hp

is this correct?

leeps

Famine

Pfft. I should be so lucky. I left school in 1996...

leeps - If 160kW at the flywheel gives 110kW at the driven wheels, you're looking at roughly a 31% loss. 137kW at the wheels should therefore equate to about 199kW, or 267hp (271PS).

leeps

Thanks to you guys .... i really appreciate the feedback
I am now a wiser man driving this scooby ..... :>

leeps