A few people have asked me to compare Clark’s dyno numbers from August to the factory JCW dyno numbers from this weekend’s dyno day.  So before I start posting comparison graphs from yesterday, I figured I would post this comparison for anyone on the fence about adding the JCW Pro Tuning Kit to their F56 Cooper S.  For those who don’t remember, Clark’s dyno run in August was performed at the same dyno shop (Genesis Automotive) as this weekend’s dyno day.  Clark’s dyno results were done in 100+ degree heat and the only thing added to the car was the OEM John Cooper Works Pro Tuning Kit / Exhaust.  The temperature this weekend was only slightly cooler by about 8 degrees so if anything, Clark’s numbers would have only improved with the slightly cooler air temperature.  Click the graph below for the comparison between Clark and the factory F56 JCW:

Published Numbers
Factory JCW:
Crank Horsepower: 228 bhp
Crank Torque: 236 ft-lbs

F56 Cooper S w/ JCW Tuning Kit:
Crank Horsepower: 210 bhp
Crank Torque: 221 ft-lbs

Dyno Numbers
Factory JCW:
Wheel Horsepower: 220.33 whp
Wheel Torque: 219.66 ft-lbs
Crank Horsepower: 246.77 bhp
Crank Torque: 246.02 ft-lbs

F56 Cooper S w/ JCW Tuning Kit:
Wheel Horsepower: 206.53 whp
Wheel Torque: 236.99 ft-lbs
Crank Horsepower: 231.31 bhp
Crank Torque: 265.43 ft-lbs

As you can see, both the factory JCW and the Cooper S w/ JCW Tuning Kit exceeded their conservative published numbers.  However, it is interesting that the JCW Tuning Kit showed more torque early on in the RPM range while the factory JCW provided more torque higher in the RPM range.  This obviously translates to more horsepower on each respective vehicle at the same RPM points.

Now when we look at a comparison graph between the factory JCW and the stock F56 S vehicles that were at our dyno day, you can clearly see that the factory JCW’s power band at lower RPM almost mirrors that of the stock F56, turning up the power at around 4700 RPM for a nice boost in performance late in the RPM range.  It should be noted that the Volcanic Orange F56 was a manual and the Thunder Grey F56 was an automatic:

Lastly, let’s take a look at a comparison graph of the stock F56 Cooper S and Clark, with the JCW Tuning Kit:

As you can see, the JCW Tuning Kit definitely adds power throughout the power band, even with a slightly richer air to fuel ratio.  If you currently have an F56 Cooper S and are kicking yourself for not holding out for the factory JCW, stop torturing yourself!  You still have an excellent OEM option to get some nice performance gains from your  MINI with the JCW Tuning Kit!  And stay tuned for my next post because those interested in the JCW Tuning Kit will have a special opportunity to pick one up at a substantial discount!!  More information coming soon!