How much of a difference will I probably notice with a TPIS air foil on my throttle body, what about removing the screen from the MAF?

 

removeing the screens can in some cases cause trouble codes and a rough idle (untill the ecu learns) but it does add airflow and after reprograming the system it does help, Ive seen 5-8 hp and since its cheap to do its worth it. the air foil is basically a waste of money, Ive seen 3-4 hp gains and only above 5000rpm and not on all engines either, many show no improvement

 

I wouldn't do either, you won't notice anything with the airfoil and removing the MAF screens messes with your tune.

 

yeah i removed my screens, and my car idles like crap, but then again maybe its the vacuum leak, or the cam, or the vacuum leak, cam, and maf sensor....................

 

I got an airfoil for free. that's probably the only reason I have one. Unless you are in the 300+ HP range I don't see it doing anything. If you want to improve air flow get some K&N's. (if you don't already)

Hodge

BTW I've been running for 3 1/2 years with my screens removed and no problems.

 

It looks neato.

 

According to calculations I got online, the pressure (Drag) of the air hitting the central uncovered portion of the throttlebody was about 0.47 pounds per sq. inch.

Central area = 5.585 sq. inches (by my measurements of photographs of the TB)

multiply by 0.47 psi = 2.6 pounds of drag

The drag coefficient (Cd) for a hollowed out shape like the area between the butterfly valves is anywhere from 1.0 to 2.0. The Cd for a streamlined shape in the same airstream is approx 0.5, so you could expect the backpressure (drag) of the air hitting the airfoil to be 1/2 to 1/4 of what it is without the airfoil.

It's true that at higher speeds there is more turbulence in the airstream, so the higher the airflow, the more the airfoil will help. Also, for 48 mm butterfly valves, the central, high drag portion of the TB, is about half of the total TB area exposed to the airstream. That seems to be a significant percentage to make streamlined.

I made my own airfoil and saved $$$.