Quote:
Originally Posted by Dimman
If the dip is manifold related then it is likely acoustics. It could be more that the manifold runner lengths are more similar (at least relative to the dip's rpm), even if the motors aren't.
But I would think that the AVCS could tune around most of it, compared to the older non-AVCS motors.
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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
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OBX header and a bit of tuning to smoothen out that dip quite a bit on the EJ25D.