To the guys using walbro pumps with big power and big injectors. I'll bet my left nut that duty cycle or Injector opening time is way more that what it needs to be,
Ive been doing some research on this and if you have injectors big enough you can make big power with a walbro but the injectors are open for a lot longer than what they need to be, and the fuel basicly just dribbles out, causing bad atomisation etc etc,
I has seen similar things to ash, where cars have had 750cc injectors and ~280-300rwkws and the injectors are approaching between 70-80% duty cycle when they really should be just ticking over.
Same guys added 2x 044s and screwed some fuel pressure in to it (single hole injectors with a less than ideal spray pattern) injector duty went back to 50% and the car no longer belched out tonnes of black smoke due to the better burn in the chambers from having better fuel atomisation.
Holy epic post for 9am Saturday lol