I already searched and keep getting different answers. I thought the TB needs to be bored to the same size as the manifold inlet. But some people are saying it needs to be 1-2 mm less. So if im going with an aebs which is 65...should i get the TB bored to 63-64 or 65?

 

the idea is to reduce bottle kneck. you just want to be able to not have a obviously noticeable area that air cant smoothly pass over, such as having a 65mm back side of the throttle body and a 60mm inlet to the manifold.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ferio 95 &raquo;</TD></TR><TR><TD CLASS="quote">the idea is to reduce bottle kneck. you just want to be able to not have a obviously noticeable area that air cant smoothly pass over, such as having a 65mm back side of the throttle body and a 60mm inlet to the manifold.</TD></TR></TABLE>

So as long as the manifold is bigger than the tb youre ok?

 

This will create a small amount of turbulance and slow the air down a tiny bit before they enter the runners, but its not as bad as the other way around.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LsVtec92Hatch &raquo;</TD></TR><TR><TD CLASS="quote">This will create a small amount of turbulance and slow the air down a tiny bit before they enter the runners, but its not as bad as the other way around.</TD></TR></TABLE>

so best bet would be to have the same size as the inlet right?

 

Yep, with a slight taper from the opening of the throttle body to the butterfly valve.

 

coo thanks!