Originally Posted by jambo
One of the things he did tell me to stay clear off was the supermarket fuel as it has to much sulphur in it and tends to go off quicker especially in deck tanks.
Id agree generally- but Tescos super unleaded is the 2nd best out there as far as tuning is concerned-the best is Shell's V Power. When ive been remapping ecu's on cars you can run a lot more ign advance with these fuels without any detonation occouring compared to any other "super" unleaded.
But as said before, you dont gain any performance on a std engine unless it has the ign timing altered and fuel leaned out to make use of the higher octain. Not all cars are mapped to run on low octain, I used to have a BMW M3 that stated in the manual that it should be filled with a minimum of 97 ron fuel(super unleaded).Jap import cars are also mapped for high octain.
As far as 2 stroke's are concerned(never tuned them for high output), im not sure whats best to do with the ignition as ive read in some cases its better to lower the advance(skimmed heads/high compression), and others to raise the advance.
Locozodiac-fill up with a tank of the good stuff and advance your ign a couple of degrees(easy to to on your Tohatsu's), lean the mixture out a bit(keep an eye on your plug colours) and you should get a crisper throttle response and gain a bit of power + gain a bit of fuel economy while you're at it!!
Just dont lean it out too far - again, keep checking the plug colours are OK.