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613 Posts
I finally gave up on my Edel 1407 carb because I couldn't fix the off idle stumble at the starting line when going to WOT. I tried every metering rod/jet changes, adjusted the accel pump, etc. and it never improved. I then bought the Speed Demon 750 mech/double pumper and dropped the mains and secondaries 2 sizes and ran that at the track. Here's the results:
Edelbrock 1407:
60': 2.036
1/8th: [email protected]
1/4: [email protected]
street tires, no consistency
Demon:
60': 1.907
1/8th: [email protected]
1/4: [email protected]
street tires, very consistent
I literally bolted that carb on and picked up over .2 sec. I raced 5 times that night in similar conditions (I"ve got 25 runs on that Edel setup in every condition) and ran between 12.75-12.85 with one 13.1 when I blew the launch. I'm running street tires so that's a lot more consistent than the 1407 setup where I would have a .5 sec range on a typical night. I just don't think the 1407's can deliver enough fuel on the bottom end when racing with a modified motor with the vac secondaries, I guess live and learn.
Edelbrock 1407:
60': 2.036
1/8th: [email protected]
1/4: [email protected]
street tires, no consistency
Demon:
60': 1.907
1/8th: [email protected]
1/4: [email protected]
street tires, very consistent
I literally bolted that carb on and picked up over .2 sec. I raced 5 times that night in similar conditions (I"ve got 25 runs on that Edel setup in every condition) and ran between 12.75-12.85 with one 13.1 when I blew the launch. I'm running street tires so that's a lot more consistent than the 1407 setup where I would have a .5 sec range on a typical night. I just don't think the 1407's can deliver enough fuel on the bottom end when racing with a modified motor with the vac secondaries, I guess live and learn.