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

rwd cars have more drivetrain loss than a fwd car remember

It'd be great to get a correlation between the different dynos; good on you Andreas for sorting this.

If we deal with standard cars, the ones that are common between Countries, even down to using the paper intake filters, and exhausts etc, I'm sure that we can work out a method that suits.

Even just a rough guide would be a start.

I'm all for trying to make this something worthwhile, and I accept your PM'd apology Andreas. I've had a sit down and a good think about things and whether you and I have differences doesn't matter so long as it's constructive, the main agenda is to improve our communities abilty to constantly improve.

Yeah WKW ratings for aust cars are

100-110 untouched sr20ve nothing at all

exhaust and tune 110-120

N1 cams and tune 130

With Fstg3 quads and headwork 140

These arn't estimates i can get mutiple runs from different cars in each section. Australian cars have Cats, and a 4.1FD which adds to the mixture.

On the dyno a few of these runs were done on K20 DC5's only pulled around 110wkw which is pretty much spot on with the crank kw-whp relation

Just like Lonewolf i have noticed strong relation between the factory crank kw and Whp on alot of different breed of cars, Awd cars are the only thing that reads lower which is a given.

One last question. Is it posible to get the Kw figures switched on the dyno to HP?

I ask this because I saw a dyno from Autech in Kws and also in HP. I am not sure if it was 2 diffent dynos or the operator had the choice in his program to do so.

Yeah DD dynos can scale in hp and kw make flywheel and drivetrain loss estmates ect.

If your talking about dales going from 98kw to 165whp they where after a exhaust and different dynos also i think.

Yeah, I know he had made changes to his setup when he made the new dyno in WHP. I was just asking as far as Kw to Hp done for him.

His 165 WHP seemed to be well on for his setup.

Compression 11.5 to 1
Stock Autech cams about size of S3s
Air filter
SSAC header
Exhaust

I want to see him put in some springs and retainers with some C3 cams. He should be able to make 180 WHP or so.

Andreas my last dyno i think was well on accurate. here is my train of thought - as confusing as it is, please follow through and you will see what im trying to show.


175 Crank HP factory. So factor in 15% drietrain loss.

175 x 0.85 = 148 Wheel HP.

To convert to KW we go:

148 / 1.345 = 110 wheel KW in our terms.

Now the absolute best i could manage dead stock, serviced well was 103 Wheel KW. Which equated to about 135 wheel HP. This is about 10-15whp down on what it should have been. On this dead stock setup - i net 96MPH down the 1/4 and 14.7 ET.


On this same dyno, Tim (turbofied) with his n1 cams 20v, compression etc managed 120kw. Thats in our language 160 wheel HP give or take a few.

Andreas, another DE hitter. Only managed 114wheel KW on the same dyno (153 WHP). His mods are Procams, 11:1 CR, light portwork (240 cfm figures) Fuji's and 2.5 mandrel system - tuned with a power FC. He managed 14.7 ET with 97MPH.

Mod for mod - in comparsion to you guys we should be reading higher figures than what we are showing, which is where our question comes in about the scaling or correction etc. I dont know why, but consistently this is the problem. Generally our crank figures are equivalent to your WHP figures.

Do our 1/4 times refelct higher HP than what we are showing?

You are absuolutly correct. I guess that is what I am trying to say. The numbers are matching up as we are getting cars unmolested from the factory being dynoed.

I just want to here from Evlnxr as to what was on his P12 when he dynoes it.

I know he posted two numbers

125 Kw with cats removed
123.5 Kw with cats on

So what I want to know from his mouth is if the car had any other mods or was as is from factory with those numbers posted.

I don't know if this factors in at all, but I've personally seen a dyno dynamics operator purposefully leave the intake temp sensor hanging in ambient air. The result was a 32% drop in recorded WHP (from 475 at the known accurate Mustang dyno we use to 360). When asked, the operator said that he saw much higher numbers with the probe placed near the air filter of the car, or even higher when installed as the dyno's manual dictates (in the intake piping close to the throttle body). He believed that because the numbers were higher, they weren't as accurate.

He truly was a piece of work. We had to rescue a BMW from their shop after they completely fudged up the tune.

Then there's the story from Utah where that shop's tach signal pickup seemed to be off 500-1,000 rpm which has the net effect of significantly raising, or lowering the output numbers (depending on which direction the tach is off).

My point? I would make sure you know what type of dyno was being used on all of the cars you're trying to use in these statistics (obviously), and then more importantly, make sure you can trust the numbers from them.