Trying to tune my Weber IDF 48 MM
06-17-17, 07:21 PM
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Trying to tune my Weber IDF 48 MM
I have an all out race car o it will not see the street, So I am trying to tune the 48 MM. I started with putting in 42 MM chokes a F11 emulsion tube 180 correction jet and 215 main. It was running rich. I have gone down to 135 main F3 emulsion tube 190 correction jet 65 idle jet. At idle I have air/ fuel ratio of 14 to 1 at 3000 rpm I have 12.5 to 1. I have lowered the fuel leave in the bowl. What do I have to do to get this carb to lean out? The engine is built for racing. Has a full bridgeport /carbon apex seals /aluminum flywheel / lighten rotors / I built a intake manifold and header 2 inch ti 3 inch pipe and I built a hi-flow muffler all stainless. The way the Weber is set up now it should be way lean but it is rich. HELP
06-21-17, 10:44 PM
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who cares if its lean, tune for power!
06-24-17, 11:44 PM
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It isn't lean it's way fat. So fat it won't run up my steep driveway. 
But I did fined the problem My fuel regulator was to high. It works from 4 psi to 9 psi so I bought another regulator that works from 1 psi to 4. I took the car out on the street today and it ran up my steep driveway no problem. Now I have to rejet the Weber because it is to lean now. It cuts out when I have my foot in it. So if anyone has problems I hope this will help. Too much fuel pressure will flood it out. See you at the track
But I did fined the problem My fuel regulator was to high. It works from 4 psi to 9 psi so I bought another regulator that works from 1 psi to 4. I took the car out on the street today and it ran up my steep driveway no problem. Now I have to rejet the Weber because it is to lean now. It cuts out when I have my foot in it. So if anyone has problems I hope this will help. Too much fuel pressure will flood it out. See you at the track
