[Richard L]

For 500+ BHP, you should run 0.8 + 1mm. Don't forget your idc is relatively low due to large injector size. One 0.8mm jet is too low.

For M50:W50, you should run between 15-20% to fuel flow. 15-20% of 4x 1000cc Fuel injector is 600-800cc/min of M50:W50.