In looking at horsepower ratings from Superchips and John Cooper Works, I notice that the former expresses it as BHP (braking horse power) and the later as PS. What does PS stand for and how are the two different?
Assuming that bhp is SAE hp, then the John Cooper Works rating of 132 PS equates to just over 130 bhp, which is slightly less than the Superchips rating of 131 bhp.Silverstone said:Actually an SAE hp is slightly bigger than a DIN PS.
You get 1.0139 PS per hp.
DIN is German and SAE is the US standard.
The ISO measure of Power is the kW and there are 1.36 PS per kW.
Here endeth the lesson. Amen.
Perhaps I've missed it, but where does it say the Cooper Works was test at high altitude in Germany? Unlike the production version of the Cooper, BMW didn't supply the horsepower figures for the Cooper Works, JCW did. It's my understanding the Cooper Works was developed and tested near sea level at JCW in Sussex. But please correct me if I'm mistaken.Dom said:but you have to remember that the cooper works was tested at BMW, and so takes from those wierd high-altitude german figures. ....
A FAQ is under construction which has a comparison of performance gains realized by Superchips and Works modifications.Dom said:I read it somewhere on this forum... but if superchips say standard cars are around 124bhp, I'd expect more than 7bhp from the modifications that come with the works conversion. I also expect BMW gave it a thorough going over at some point if it was to be fitted by BMW dealers. Although I'll readily admit, I'm not an expert on this!