Quote:
Originally Posted by Bench Racer
Does anyone know what cfm a 48mmGM throttlebody flows? I would guess maybe 580cfm but this is a wild guess. I cant see how it would be close to a Q-jet's cfm. Just thinking out of the box but I would think the performance advantage of the efi would be a imediate throttle response with improved low rpm torque, with the carb making more total top end power while giving up some on the bottom end. The larger LS-1 or the drag pack efi I think would be superior to a carb in all rpm ranges. Just my $0.02. Don Jackson.
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Don. The smaller throttlebody only flows air not a mixture.
I had a real hard time grasping throttlebody do's and dont's. I might not be right now. But the way I under stand it (simplified) the throttlebody is basicly feeding one cylinder (at max) at a time.
I had a 65mm throttlebody (probably over sized) on my 4 cylinder Neon and a box manifold feeding all 4 cylinders. I switched to 4 Individual Throttlebodies each one directly feeding a cylinder. Each throttlebody is 52mm. It took a long time to sink into my brain that this setup wasn't way to big. But it finally sunk in that the motor was only feeding one cylinder at a time (100%) and one throttlebody over each hole needed to be big enough to feed that cylinder.