I tried Shell 100 octane racing fuel in my Vectra v6 with remarkable results compared to Shell 98 and want to hear if any of you guys in the UK have experience with the z22se engine. I am normally running it with 98 octane but wonder if using octane boost additives makes much difference?
There is a significant improvement in accelerator response, that short hesitation is gone and the engine reacts instantly. even if there is no more power the accelleration is better because of that.
H