I need help!!!
Last year I started with a 650DP but had very bad stumble problems. I later changed to a Road Demon 625 VS. The Demon was much more drivable but I knew there was still problems. I really didn't know if I was rich or lean and when. So over the winter I installed a O2 sensor in one of the headers and built a O2 gauge that I built into the shifter. Anyway I now know I am running into a lean situation.
My Jetting and idle mixure is a bit rich but I think it is fine. I may lean out the jetting later but for now that's not my big problem. The problem seems to be in the accelerator pump circuit or even the PV circuit.
When I do a brake stand it leans out big time. Also when I step on the gas at first it is fine but then leans out until the RPM starts to come up. I had a 31 squiter and tried a 28 squirter to make the squirt longer. That did seem to help but not much. I am thinking about trying a 25 squirter.
When I was trying to work with the Holley I beat my brains out with squirters and pump cams and the problem moved around but never went away. I'm worried that I'm in for the same strugle again this year. Does anyone have some insite they can offers?? I am somewhat lost here. I don't think this should be this hard. Could this be to little stall, to much carb, to little carb???? HELP!!!
My motor and car specs are,
224 @ .050 .536 lift
E7 heads ported
Performer RPM intake
'68 Fairlane FB
2000 RPM stall