Which is faster carb or Fuel injection?

[Rich Biebel]

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.

If the 48mm throttle body was too small an LT-1 engine would likely run weak when built as a SuperStock engine....The throttle body would limit performance.....and thats what I thought when I raced one in Stock...

From the numbers I have seen those engines run in SS/IA or SS/JA or in a GT car......they run very well.....so I think the 48 mm throttle body's ability to move air can not be directly compared to a carb like a Q-jet that flows air and fuel....