Just returned form a visit to PCS to have a new supercharger pulley fitted on my E55 - thanks again to Jack, Olly and Graham, great service and care as usual
I had the chance to open the car up a few times on way home as I been having to drive my car very sedately for last few weeks due to pulley issues. My car now has upgraded bosch 10 IC pump and also new upgraded Eurocharged Heat Exchanger fitted. Even with these cooling mods I did notice some irregularity when pulling hard. A couple of times I floored it and the ESP lights were flashing at 70 mph and the acceleration was brutal, whereas other times it definitely didn't want to pull as hard. Maybe even with these mods our current weather is causing some issues, which would be far more noticeable in standard spec.