hub dyno

[votek]

hey guys,

my friend just emailed me and said he just got his car dynoed on the hub at 97.5 fwkw. i just wanna know how to convert that figure into a normal dyno like dyno dynamics or something like that. cheers.

[ACTI0NMAN-1]

if its measured at 97.5fwkw, thats what it should be. the only alteration that should need to be made is if the dyno hasent been tuned in a while, or you are trying to calculate torque.
what is your mates car a vtir teg?

[votek]

nah civic vtir with cold air + extrators and tune from a vafc..

[ACTI0NMAN-1]

sounds about right for a vtir teg/civic with those 2 mods.

[votek]

for instance the b16b type r has 185hp in the engine, how do i convert that into kw at the wheel? cheers

[ACTI0NMAN-1]

go to google and type:
185 horsepower to kilowatts

remember there is drive train loss, condition of engine and weight of wheels that make a difference.
you will also have massive loss if the car is an auto.

[votek]

i tried that and that gives me kw in the engine.. ><

[votek]

i pretty much just wanan know the civic type R b16b engine at the wheel.

sorry for the hassle

[ACTI0NMAN-1]

i would think about 105-110kw atw tuned, with hd clutch and lightened flywheel.
about 100kw atw with basic IHE.

[aaronng]

The general estimation is to multiply by 0.8 for a hub dyno and 0.75 for a rolling road dyno. So 97.5kW is estimated to be about 91.4kW on a dyno dynamics type dyno.

[ACTI0NMAN-1]

hub produces higher figures as the vehicle doesnt need to spin rollers.

fyi
http://www.autospeed.com.au/cms/article.html?&A=0930

[aaronng]

hub produces higher figures as the vehicle doesnt need to spin rollers.

fyi
http://www.autospeed.com.au/cms/article.html?&A=0930

Actually, it's because the hub dyno doesn't take into account the weight of your wheels. All dynos measure torque at the rollers/hub, and then calculate the power you make from there. Since the rollers measure the torque after the wheels, it is lower than the hub dyno.

[040501912]

SOOO !!! which 1 is more accurate ? for tunning ?? and what is better results after tunning it. and running on street latter on ?

:S lots of pros and cons here lol

[aaronng]

Both are good for tuning.

[krogoth]

IMO

a rolling dyno, would be more realistic and more accurate

and i agree that a hub dyno shood produce higher power readings than a roller/wheel dyno