Re: turbocharger supercharger

Posted by shinyribs on Oct 04, 2011; 11:31pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/turbocharger-supercharger-tp3374914p3395023.html

Samir nailed it.When the boost changes the fuel pressure HAS TO also.It has to be done just to keep the float bowls full.If you run too much fuel pressure it will not make the bike run rich,it will flood the bowls.It will just over power the float/needle and seat.You cannot force feed fuel through a carburetor.Whether you are using forced induction or not,the fuel is always DRAWN into the engine by vacuum.You may not be able to read it on a gauge,or even record it,but there is always vacuum,whether naturally aspirated or not..Remember when we were talking about pressure differential? A larger jet is less restrictive and will "allow" more fuel to enter an engine,but it will not "push" more fuel in.Same thing with fuel pressure.You only need enough pressure to fill the bowls completely to the point where the float will cut the needle off.Naturally aspirated,these bikes rely on gravity and the float and needles are calibrated accordingly.When you pressurize the float bowl that Honda intended to have "zero" pressure in it,you have to adjust accordingly.There is no one pressure that will work with all boost levels,thus dictating the need for a boost referenced fuel pressure regulator,and of course an electric fuel pump to supply that pressure.