1991civicsi build thread
#298
Re: 1991civicsi build thread
i have actually considered the thought of the 1:1 FPR. my thoughts on it are that fuel pressure in a honda is used to seeing vacuum or normal atmosphere pressure when it comes out of the injector. when you start boosting, the fuel coming out at 45psi is being slightly held back in the injector by the boost pressure. not such a big deal at 5psi but at 20 it might be. if the fuel in the rail is 45psi and the air in the IM is 20psi, then once the injector opens its like the fuel pressure is 25psi. my only real arguement for not doing it and complicating the system more is that so many people dont do it and run 20-30 psi with no problems, so it must not be a problem to begin with. another thought i had while typing is that maybe air pressure and liquid pressure are so seperate that the air pressure really doesnt effect the fuel pressure