Is there any DYNO proven advantage from changing from the droopy ea/ed manifold to the ef manifold. Ive heard the ef ones are better for low end, but the Ea-EB ones are heaps better for top end pull.
I can get these manifolds easy as ,just woundering weather it would be woth the effort to change.
if running a cammed up motor wouldnt the EF/L manifold make more sense to get back some of the low end that you lose with the cam?
Rosewood EAII Fairmont 02/90. MPFI 3.9L (formerly CFI), 4spd BTR Auto. Skyline geared 3.45g open center 28 spline 4 pinion differential & axles. 2 1/2" Cat Back Exhaust. King Super Low Springs. Sound: Equalization and amplification by Clarion; Head unit by Sony, Front, Rears and Sub by Pioneer. Planned mods - t5, Extractors, Painting Grey Strips and new front and rear bar.
when building motors, i figure u carnt have it all.
With The 250 crossflow i built i used an ed manifold, cut down to shorten the runners, and welded to an xf injection manifold. With wild cam, over 260 @0.050 and 560 lift, low in the rev range it made nothing , but at 5500 made 300 hp (220 kw and at 430 nm at 3900. If i used a longer runner manifold, i wouldnt of gained that much power down low, and it would of killed the engines top end pull.
I figure u design cam/manifold/head to all work at the same rpm range, that way when u hit that range all hell breaks loose
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