why even use the fc manifold at all???
i was running the standard 12a rx7 manifold and adapter plate(over the counter purchase $60 if i remember correctly) with impco 425 mixer (square bore base)and 1 convertor and ran like a trooper before i changed my system to add a supercharger and am still using the 425 with it again..less throttle plate
the other way u can go using the 225 mixer is to make ur own adapter plate to mount an EA falcon throttle body directly to ur existing manifold and hog out the original 4 ports to make it one open ported manifold and the mount the 225 mixer directly on top of the throttle body..easy as
suss the pics on the old setup....just remember this was very early days when i tried to run it as a blo through with minimal success..gerrrrr (kept blowing the top hat gasket due to the constant boost of the blower....till it all got changed...check my thread
http://www.ausrotary.com/viewtopic.php? ... t=blown12a
as u can see in the pick there is a spacer plate(actually is a nitrous plate)where i was goin to add propane fumigation to the system..look it up!!
i been playin with gas for a few years now and tried many different ways of setting them up..stick with impco or gasresearch as the newer positive pressure systems seem to not work too well on rotas unless u get an adjustable prime gas safety lock otherwise they will flood a rotor on initial prime(i actually gave my adjustable one to my dad..doh....impco's are dumb and simple= they just work and parts arent stupidly priced either
i actually went back to impco after tryin the newer system
10.30 worth of gas for 150klms.....in its current configuration and thats payin 59.9cpl too im cheerin
up the timing till she starts to ping and back it off a smidge as gas likes more advance..u can even lock off ur distributors mechanical advance
i can get u the proper exact figures if u like
i just tune mine by smell but it doesnt hurt them to go a little bit richer than 14.7 to 1
u can tell if the high speed mixture is too far out via the perfomance ...screw out till she dogs and screw in till it starts doggin again and go in the middle..same deal on the 225 as its only a restricter paddle thingy majigy thing
with my setup u can still keep the orig solenoids in place too..but with lpg u can legally remove all emission equipment on the vehicle...hehe
for the omp pump u can actually pull out the brass original omp tubes out of the orig carby and u will see they actually have a step in them when u have ur inlet manifold off u can drill 2 holes(the smaller diameter of the step) and loctite them into ur manifold into the ports somewhere ...if u arent gonna turbo it in the future
when i had my car sit for nearly 12months with troubles with the blower gear (blower actually injested a bit of metal)and was starting to die in the compression department i went back to naturally aspirated and everything other than the blower setup in the old system picture to get sum miles back on the car till she came good again