Just wondering if this possible and if so ...how?

 

It is possible to change the A/F ratio by changing the fuel map on the PowerFC. But if you had to ask, you are not ready to do it. Do tons of research before you change anything -- it is easy to blow the engine if you don't know what you are doing.

Whatever you do, don't try to tune it to 14.7:1 (stoich) using a narrow-band sensor. That is what many people start out thinking they should do because it seems to make sense. But the reality is that 14.7:1 is way too lean and narrow-band sensors are not accurate enough for any kind of tuning work. You need a wide-band sensor (if you had one, you would know it) for tuning, and you want to shoot for something in the 10:1 to 12:1 range.

BE CAREFUL -- DON'T CHANGE ANYTHING UNTIL YOU KNOW WHAT YOU ARE DOING OR YOU MAY BLOW YOUR ENGINE.

-Max

 

ok, I have a mate who owns his own rota workshop and he specialises in this stuff, I think its time to swallow my pride and take it in to him

 

That's what shops are for right!?! lol. Not everyone can do everything themselves.

With this car it is best to let someone with lots of experience tune it, (but keep your own eyes open and learn.)