someone mentioned we should start another technical thread. maybe you guys will have something to say about this one.... we all heard of it and know its been said to aid in velocity. but when does it hurt performance? does a throttle body designed to improve the venturi effect actually aid every intake manifold? also, does it depend on the design of the plenum?

 

i got to see this and if it really makes more power

 

All stock throttle bodies should have a slight venturi to help stabilize airflow through the throttle body but I don't think it's used as a performance (as in horsepower) enhancing device. Some poorly thought out aftermarket throttle bodies may not have one. The airflow is just going to slow back down slightly after it enters the intake plenum so it's just there to increase the velocity past the throttle blade.

 

it normally happens with carbureted engines as it helps pull fuel into the engine. also it helps mix fuel while bringing in air. some questions i have are, how well does this work in intake manifolds with say long straight runners? or does this work better with certain designs like the GSR manifold? at some point could it be harmful to none carbureted/ ITB engines. it makes me wonder does it really create horsepower or just give you better fuel economy? in topics like this you cant forget Bernoulli's principle

 

true scott..... so if we have a throttle body centered in the middle of an intake manifold like on the RDX would it be safe to say the position of the throttle body by itself is responsible for improved velocity or maybe because the venturi effect is not moving horizontally? does the venturi in conjunction with the manifold design aid the over all velocity or is it the design of the manifold by itself?