Originally posted by Dave B: Can you guys elaborate on the intake manifold work you guys are doing? I know Demon removed his butterfly valves to somehow gain topend performance. The intake manifold setup I have on my Maxima utilizes the same kind of intake runner tuning with butterfly valves. I actually have a manual override switch to make the valves open at any rpm I want. I've noticed that switching the valves on any earlier that 5000rpms results in a pretty severe loss of lowend power. Take a look at my dyno when I flipped the switch at 4500rpms vs 5100rpms.
Well the 3L with oval port heads that he's sporting now doesn't have secondaries from the factory. It doesn't need them because of more displacement and tq. A few people have removed them from their 2.5. Makes them a total dog below 3800 though. Their argument is that they never drive down there anyway. They were engineered for a reason. To increase low end.
Originally posted by Dave B: Why does the lack of the butterfly valves help the CSVT? Is there a loss of power below 4000rpms, but a gain above because the valves and rod are removed to reduce high rpm power?
Yes.
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
They were engineered for a reason. To increase low end.
