Quote Originally Posted by poid View Post

You cant tune the stock ECU at all...its just a matter of keeping the car serviced. That includes things like checking the tappets are in spec, not just changing fluids.

EDIT: i should add that the better performance you are feeling from the 100 RON fuel may just be a perception thing, there might not actually be any benefit.
there is definately a big difference in response. not just my own perception. i can understand that difference.

i never touched tappets, and my understanding is that loose tapets gives you a specific sound to tell you that they are loose, specialy at the time when you accelrate and then release it suddenly, you can hear shrilling or (cant rrealy explain tappet sound)

and tappets cannot be tightened by themselves

is there any other way to findout if tappets are loose, thanks.