[Chrislong]

Run the car too lean and it could go quite soon, how soon, well, how long is a (relatively short) piece of string. But your best not risking it.

I have been given some pointers, im going for a 30% fuel as I believe it may be easier to tune, and more powerful as well as running cooler. If you sit the car ticking over for 30seconds and accelerate it should splutter then go, if not its too lean - richen it.... in a nutshell.

But you will need to adjust tuning by 2-5minutes of a turn depending on the climate. As air density in the UK is so different one day to the next - you'll know about this with your Audi S3, Nissan 350Z - feels quicker on a cool day, thats cos it is - dense air leans out the mixture and combusts better. We have no knock sensors to sort it on an 1/8th though. Just judgement and a weapon (screwdriver).