thanks a lot for your help and link.
yeah, I know the HFS-3 follow IDC. my thought was low jet idc might not be very accurate.
so when using only 60% of Fuel IDC, it might have been better to use smaller jets and play on gain to optimize jet range. if you see what I mean
my way of thinking might not have been the best thought
the reason why the 1350cc turbo has larger 550cc injectors is cause it was running 90% ethanol for some race (straight in the tank)
but now it is running on regular RON92 fuel. so it doesn't use more than 60% injection duty
about restrictor in that case, what should I do ?
550cc injectors means I would have 2200cc total injector
20% = 440cc jet flow.
so that would mean I would need 0.8 jets and 0.7 restrictor
0.7 restrictor is meant to use up to 680cc, but as I would never use more than 60% injection duty cycle, it would means the pump would never actualy need to flow more than 265cc/min. so should I use 0.5 restrictor instead ? (as they are meant to be use up to 380cc/min)