They flow better. By a good bitThey look cool but I don't think they would flow better since they have 4 small openings instead of a single large one.
Maybe I'm misreading you here but it looks more like OP is referring to a 4150 TB with a fuel injector at each cylinder than a throttle body injection system(which I'll agree is crap)The whole purpose of the long runner EFI intake manifolds is to optimize throttle response and torque curve. A short runner manifold will typically make more top end power than a long runner manifold. On a production street car, a intake that promotes throttle response and low end torque will make for better driveability. Also with EFI, since the fuel injector is near the cylinder head and pointed at the intake valve, you do not have to worry about fuel distribution issues with such a long runner path. Which is why you do not see CFI or throttle body fuel injection on long runner manifolds. A throttle body fuel injection system is nothing more than a electronic carburetor, maybe the fuel is atomized a bit better, but that is about it.
Edit: In my opinion, throttle body fuel injection is the poor mans excuse to say you have "EFI" save your money and buy a good carb instead, like a QuickFuel carb. It will make more power than any throttle body "EFI" system.
I'm picking up what your putting down
Am I losing my mind or is this not what OP is talking about? It's NOT a TBI setup
The whole purpose of the long runner EFI intake manifolds is to optimize throttle response and torque curve. A short runner manifold will typically make more top end power than a long runner manifold. On a production street car, a intake that promotes throttle response and low end torque will make for better driveability. Also with EFI, since the fuel injector is near the cylinder head and pointed at the intake valve, you do not have to worry about fuel distribution issues with such a long runner path. Which is why you do not see CFI or throttle body fuel injection on long runner manifolds. A throttle body fuel injection system is nothing more than a electronic carburetor, maybe the fuel is atomized a bit better, but that is about it.
Edit: In my opinion, throttle body fuel injection is the poor mans excuse to say you have "EFI" save your money and buy a good carb instead, like a QuickFuel carb. It will make more power than any throttle body "EFI" system.
Again, this isnt a TBI system. These are much more efficient than those old systems that chevy used the heck out of in the 80-90sthese were designed to be installed on engines that never came with EFI. for instance, find me an EFI intake for a 390 or 428 ford. no? how about a boss 302 or boss 429 ford. no? perhaps a boss 351 ford. no? throttle body injection is also nice when you want to install EFI but dont want to use all the factory rigamarole. as for the factory intakes being designed for low end power, that is true, BUT they are also dry flow systems. you can accomplish the same thing with a throttle body injection system and a dual plane intake like the performer in a wet flow system.
the difference in efficiency is small, the biggest difference is no sefi system with TBI.
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