Quote:
Originally Posted by WingsofWar
That makes me try to visualize what the acoustics are like at the manifolds. Is it the really the length? or could it be the materials? no wait...the intake manifolds on the EJ251 are metal while FA20 are phenolic plastic.
What about the header...yeah very similar. Is it the OEM EL header causing this?
Check this out!
http://www.rs25.com/forums/f5/t48917...o-results.html
^
OBX header and a bit of tuning to smoothen out that dip quite a bit on the EJ25D. |
It's the length that matters, because the air will pick up velocity and then as the valve shuts a wave starts to travel in the opposite direction at the speed of sound.