from efi to carb in two weeks, my experience

[vector1]

well, actually, i played with the efi for 6+ mos. and couldn't get it to run to my satisfaction. accel gen 7 setup, so i gave up and put a carb on. chose a dui distributor so i could get away from the msd setup and use one wire to fire.

the rewire was more of a problem then i thought it would be and now know why i hate wiring, although it wasn't too bad considering i had made most of the wiring mistakes already.

the original hi pressure pump and lines were retained, i used a lighter spring in the regulator and still had to cut one coil off but the pressure is now a steady 7 lbs. or wherever i choose to set it.

the dui dist. is nice, one wire to the tach, one to the power, get it close and watch for fire out the carb--happened once, kind of an eye popper when that big flame roars up but luckily went out rather quickly. so just keep moving dist. til it fires and runs.

installed a wb o2 sensor setup from wideband commander that i had in the shop since i still had the bung in place, this is nice.

i started with a pro systems carb that had been built for a 375ci engine and it ran rather lean according to the o2 gauge, didn't know if the gauge was incorrect but couldn't really run it in this fashion, the idle was good at 13.5-1 but wot was up in the 15-1 range. the engine ran good though, no backfire or hisitation except off tip in sometimes. the accel pump was a little loose and wasn't getting the fuel to the inlet quick enough imo. if i hadn't had the o2 sensor things could have turned out bad some day.

in a moment of desperation i changed to a bg rr 750 and the car ran about the same, except the afr was in the correct range and didn't fluctuate through the rpm range as much as the pro systems. idle was rich at 12.5-1 but wot and everything else looked better. this morning i adjusted the carb per bg instructions and adjusted the idle screws in 1/4 turn and the afr went to 14.5-1 with just 1/4 turn, lots more sensitive then i thought they would be. with all the trash talking on bg carbs i was surprised at how well this carb performed. don't think i'll do the pro systems thing again, it's on a 351 crate motor now and still has some tuning that needs to be done.

i like the carb setup for now over the efi, car runs different, sounds different, and is easier to drive imo.

i think the sup vic manifold the efi setup uses is not suitable to rr lightweight cobras and is geared more toward the 1/4 wot high rpm crowd. the rpm air gap pulls much better throughout the rpm range. and really, don't think i lost anything power wise. also, imo, the accel is much too sensitive hardware/software wise for what i was trying to accomplish with my experience and knowledge.