Quote:
Originally Posted by Nige
With the 4 wheel drive how do you work it out 20% 22% 24% ? The MlR boy's go by the 24% rule. I think it's wrong!  |
dyno dynamics use a fixed percentage (ignoring environment influences - atmospheric pressure, air temp, intake temp etc).. 22% iirc in shoot 44 mode for 4wd... no matter what the car is etc.. there are influences on that further with regard to rpm pick up and where calculated at a speed divided by rpm etc..
other dynos like dastek for example uses a measurement at half to full throttle at 3000rpm to take a measurement of speed v rpm and tyre defomation and then records drag on the overrun..
I use both dastek and dyno dynamics a lot, I tend to be judging it from a different view point to your question is asked.. ie. I am mapping a car for the road.. not just to get biggest figures or whether they are correct per say.. obviously they give an indication and are used in setting a car up.. ie. it makes more power on this run after changing x y and z therefore it is adventageous to change them etc..
Its easy to get hooked up on figures..
Simon