Sicdatto1200- what type of carb and AFR meter are you using?

I in my ute (drawthrough, sc14 blower, d/d weber) I sometimes get pinging on transition from cruise to full throttle. the AFR meter clearly shows this to be a lean out problem-as the throttle plate opens the pump jets don't squirt enough extra fuel in.

people tend to report better results out of SU's than standard type carbies as they deal with velocity changes better.

WATER INJECTION-
somthing I am looking into so that I don't have to decomp.

Running a boost activated injection system on a drawthrough setup (with the water injection before the compressor) is conceptually flawed:

The manifold has achieved boost, the switch is triggered, water starts flowing into the carb/inlet manifold, through the compressor and finally reaches the inlet manifold....... how long after the initial signal? possibly only fractions of a second, but definatley a revolution or two after it was required.

to offset this I suppose you could set the switch a psi below where you need it.

Also, the guy at my local dyno shop assures me that running water through a turbo or supercharger will make atomisation worse, not better.