No idea, my mate set the car up after i built the engine, Hes owned RST's for 20 years so he knows his shiz, shame hes on holiday so i cant get it sorted

Im really pissed off, as it was perfect until i put optimax in it,
and for the life of me do not think it can be anything else, as its done 1,000miles bang on, and run better than any rst i had before.