Stock FS-DE dyno

[Rdshark1]

stock dyno (non-MP3)

I think I've seen that somewhere...oh yeah...here:

 

[Spooled]

Wow, the curve below the VICS switch point looks odd. It's almost as if the intake pulses weren't lining up correctly with the long resonance chamber open. that makes me want a single runner mani for my MSP even more.

 

[Reffoxel]

Does the msp have a different intake manifold than the P5? Had my P5 manifold ported and the machine shop acid dipped it and low and behold what I thought was a second set of runners (the holes next to the ones for the outside runners) actually weren't, those second set of holes just lead to a big chamber that goes no where. Asked guys at machine shop what that was for, and they had absolutely no clue, they said they've never seen that before on any other car.

 

[Spooled]

Does the msp have a different intake manifold than the P5? Had my P5 manifold ported and the machine shop acid dipped it and low and behold what I thought was a second set of runners (the holes next to the ones for the outside runners) actually weren't, those second set of holes just lead to a big chamber that goes no where. Asked guys at machine shop what that was for, and they had absolutely no clue, they said they've never seen that before on any other car.

Well, I guess I mis-spoke when I called them "runners". I just used that term since that's what a lot of people call them. They are actually resonance chambers that alter the frequency of the intake pulses by bouncing them inside that extra chamber. As the RPM goes up, the distance needed to line the intake pulses up with the valve timing changes, so the chamber is closed. And yes, I think the MSP and P5 have the same intake mani.

 

[TheMAN]

not exactly the same... from what I heard, the the VICS actuator rod is slotted for the butterflies (like the FS-ZE intake manifold) in the MSP intake manifold, but on the normal 2.0 intake manifold (as well as the MP3 one), the butterflies rest on top of the rod instead.... the latter design makes the butterflies not as secure.... this difference could probably explain why the MSPs don't have that recall on the screws

I still have to confirm this with pics comparing both!

FYI, the FS-ZE intake manifold goes further by having an actual resonator that with the help of VICS, provides fuller and better resonance tuning... it actually does help increase/maintain low end power as well as the the very top end! This setup makes it a cheap/simpiler alternative to the VRIS setup found on the V6 mazdas... I'm not exactly sure, but I think with the VICS closed, the resonator itself is doing the resonancing while the engine is at low RPM, but when the VICS is open, the resonator not only does the resonating, but the VICS is also.... the s*** just works, and it does help give a flatter powerband! I'm dying to see what happens with this s*** under boost!

 

[Kansei]

good info Edwin, that could explain why MSPs weren't affected by the recall.

 

[Spooled]

FYI, the FS-ZE intake manifold goes further by having an actual resonator that with the help of VICS, provides fuller and better resonance tuning... it actually does help increase/maintain low end power as well as the the very top end! This setup makes it a cheap/simpiler alternative to the VRIS setup found on the V6 mazdas... I'm not exactly sure, but I think with the VICS closed, the resonator itself is doing the resonancing while the engine is at low RPM, but when the VICS is open, the resonator not only does the resonating, but the VICS is also.... the s*** just works, and it does help give a flatter powerband! I'm dying to see what happens with this s*** under boost!

TheMAN, this is very interesting info. I'd like to see a diagram of this "resonator". I always assumed that the secondary plenum in the MSP IM was a "resonator" in the way that it alters the intake pulses to line up with valve timing.

Does anyone have photos / tech drawings comparing the two?