hey guys a mate and I have been messing around tuning his bf mk2 zf turbo on a mates dyno, ive tune a few cars before but all have been after market haltech, autronic etc. not calling myself an expert but I enjoy it, n strong believer of building your car your self not signing a cheque. just wonder if theres anyone outb there doing the same, as at the moment I believe I has missed a setup setting some where as after making fuel and boost adjustments the car will will hold and decent afr for sort period, and the become leaner and leaner. unsure on what I have missed any help or direction of a similar thread would be much appreciated.