Thread: Figures On Kw To Hp Convertions From NZ To USA

I want to take a look at Evlnxrs car. The one in particular is the P12 Primera waggon which is stock

He made 125 KW to the wheels which equates out to about 170 WHP. Now considering that a 204 BHP car equals about 201 HP is it fare to say that a car making 201 Hp will make 170 WHP. If so please consider the numbers below. These are all FWD cars so the % of drivetrane loss should be close.

I have a few cars in mind that make 200 Crank HP and when put on the dynos in Miami, they make about the same Hp converted to the wheels bone stock.

1. Honda-Acura Type R makes 195 Hp = 167 WHP on our Dyno.
2. Acura RSX Type S makes 200 HP = 171 WHP on our Dyno.
3. 2007 Civic makes 200 HP = 172 WHP on our dyno.
4. 2008 Sentra Spec V 200 HP = 171 WHP on our Dyno

5. Primera P12 makes 201 HP = 125Kw To the wheels or 170 WHP with cats removed or 123.5 Kw to the wheels which = 167.5 WHP unmolested stated by Evlnxr.

These figures from 1-4 can be verified on the net and with dyno sheets that I can also get, from Dyno days I have been at.

Evlnxrs Primera P12 makes a proven 170 KW to the wheels which equates out to 201 Crank HP from the factory. If so can we agree that we have some form of equilibrium. Can we say that this is a fare convertion.

In my opinion I say yes, if we can agree on this then we have a starting point to look at.

Please give your thoughts on this. Clint, Amderman, Evlnxr, Kiwi-japie.

personally, i've always seen a bit of a thing with aussie dynos
crank KW is generally around the same as whp.

Ie my car makes about 175whp (on a dyno dynamics dyno), and i'd expect around 175kw at the flywheel with my mods.

in the end, every dyno is different, its only a guide when comparing between them...

I agree that a Dyno is a tuning tool but you can plainly see the correlation between the cars listed above. It can show you a refrence point.

175 WHP is about 210 Crank HP


175 Kw at the flywheel = about 172 WHP

definitely, it seems we agree
ive had 4x different fwd cars, all have dyno'ed around this level.

Andreas, I can't see any issues with your calculations above. They work out pretty well with a small margin of error. It's interesting to see that 15% drive-train loss seems to be the norm for a FWD car, when I though it would be a bit less. Time to go modify my Horsepower thread accordingly. =/

It would seem that what ever dyno Evilnxer is using in Aussy land is directly comparable to ours (despite what I've read elsewhere about US dynos reading higher than AUS counterparts*).

*I never believed this anyway. I assume it's down to the typical differences in dyno readings (brake vs. eddy current) coupled with improper unit conversion.

but the wagon had the cats removed, so its not going to make the claimed factory output

you cant say the car puts out 201 hp stock and equates to 125kw's because that car with the cats in place would not have made 125kws.

on top of this there is always a difference from dyno to dyno.

i will try and dig up standard cars on the dyno in Australia

i vaguely remember a standard s15 making 98rwkw's with standard output claim of 144kw.

In this post and also stated by Evlnxr in his dyno post, he said his car made 123.5 Kw with the cats on. Which is 167.5 WHP. This is well within the HP figures.

The standard SR20VEs made around 105 - 110 wkw on our dyno day.

Darryl's car (EVLNXR) made in the 120s with the cats on & P12 cams but he was running an aftermarket ECU & had been tuned, he also had a 3" exhaust... Darryl found that taking the cats out gave an increase of 10wkw on this setup.

The wagon he dynoed had the cats removed but hadn't been dynoed with it in and I'm don't know what exhaust it was running.

Cars with SR16VE cams, headers & 2.5" exhausts, 370cc injectors & aftermarket ECUs etc tended to make in the low- mid 120s.

A std Honda K20A will make between 116 & 122

How do all those figures compare?

I got

110 Kw is about 150 WHP Standard SR20VE

122 Kw is about 165 WHP Honda K20A

125 Kw is about 170 WHP SR20VE, SR16VE cams, Headers and 2.5 exhaust

1 KW = 1.34 HP so those look about right.