Spacer kit used for increasing the intake camber volume to gain power. A complement mod to aftermarket intake systems.

 

Very interesting concept. Have you dyno'ed it yet ? How much would it cost ?

 

So that's what the insode of the plenum looks like. Very interesting indeed. How thick is the spacer? Looks like a 1/4" thick.

 

If you search the older threads, there's more info about this spacer. I think it was something kinda expensive for just a spacer.

 

I don't have this part. I came across it somewhere. Didn't know it was already mentioned. The concept is interesting. I don't know what it cost, but if there's interest someone like Dweeb who's making short shifter kits and has access to CAD/CAM and a 350Z can manufacture them for possibly alot less?

 

I doubt it is thick enough! Dougs plenum was flow bench proven and eliminates the 30% flow loss to the front two cylinders but needed more than that spacer will add (as it is there).

 

I had a friend fluent in Japanese send half a dozen emails and as many calls trying to get confirmation that this is available and will fit the US spec version - All he got was the runaround from Esprit.


My money's on Doug at Crawford Z...

 

What about the rest of the cylinders? The benefit of a spacer is equal volume to all runners, not a few that may cause some to run leaner than others. Another is being able to still use the stout factory stress bar. Granted the spacer is not a radical mod to the plenum to get the most out of it like a fine tuned plenum made from scratch.

 

The problem now is that they isn't even flow. That part of the design goal of Doug's plenum, as I understand it. The front cylinders don't get as much air stock.

 

Mannish is right. Ths stock plenum slopes down big time toward the front (30% difference in flow between the front and rear runners). Also from the looks of it, the stock strut bar wont fit with even that spacer.

 

Interesting. One would have assumed that Nissan engineers calculated and measure their flow/design. There's a science in designing intake plenums. The plenum isn't under constant flow. It's also under pressure from the piston strokes, so a flowbench isn't really an accurate measurement. I think this is one area that with the right design can unleash additional power. That nice CAI or higher flow panel replacement filter can only do so much when the plenum may be the greater bottle neck downstream.

 

Until you notice that things start to not fit and compromises are made!

 

In house Nissan uses flowbenches. Its certainly a good benchmark for measuring flow.

 

I'm pretty sure they do for cylinder heads, cylinder heads + intake manifolds, etc. Measuring the plenum alone is only part of the story, not the complete story with the other components it will have to be involved with.

 

The heads intake and plenum were all flowed toghter .

 

Ok, if that's how you conducted your flowbench test then your plenum looks to be very promising.

Some how I got the impression that only the intake plenum was flowed without the cylinder head.