Rich, its quite the same story for us to turn round and question the accuracy of the calibration for the rolling road/s you have used to attain your figures, to me they sound high and i wouldnt expect 176bhp out of a CTR on the RR we use.
At the end of the day you are dealing with not just an engine turning comapany but quite possibly one of the only companies that doesnt use power figures as their selling point. With 2 dyno cells its pretty much impossible to argue that any of the calibration methods used for the their RR are incorrect. And as we all know, to calibrate a RR you input a known torque value, and this is where most other RR operators either cheat or dont bother calibrating. When 200bhp on their dyno cell equates to 200bhp on their RR using the rolling losses (note NOT transmission losses) your pretty much left with nowhere no base an arguement on.
I could quite easily present you with a gearbox with a 1 handle on the input shaft and the box in 4th, youd be surprised to turn the thing over requier very little effort. Now if i presented you with a loaded wheel at 30psi anda 1 handle, you would be using more than your body weight to get the thing to turn over at a constant speed. The pinch factor on your common radial steel belted tyre takes alot out, and you can adjust that quite easily but gaining anywhere up to 5+bhp by running at over 50psi tyre pressure.
Likewise coastdown calculations are a total waste of time, dependant on what gear you spinup in and coastdown in, typically 30 brake can be found without changing any ambient figuers.
I really could go on for hours about the black hole of rolling roads.........But like i said, theses old boys dont play with turbo clios, or hot hatches......they go away for winters to build 7000bhp top fuel drag engines in the states, last things they need to do is play up to some clio owners. They are a friendly bunch, but it wont stop them from telling you the truth, whether you like it or not......which is more than can be said for the majority of the tuning industry.
Our figures with our calculations work for us to give you near the correct fly figures, within reason....our calculations with your figures wont.
Hope i havent come off as rude in any manner, but it would be quite nice to see what your car would get if you popped up. So thats me sending an invite
