Mini Cooper S JCW power loss
I have got 53 MCS JCW but something is wrong with it. I have spent hours digging through mini cooper's forums but cannot find straight answer of what should I do next.
Firstly it takes around 9s to get from 50-70 and the max speed is 127mph which is way too slow for mcs. I have checked the boost and it is just over 1 bar so i presume there is no problem with the supercharger, also there was no faults found when the car was connected to a computer. I don't know in what position the bpv should be but when the car is off I can pull it out slightly further, however when i turn the car on it stiffens and I cannot move it anymore. Do you have any ideas what should I check/changed first?