TwinTurbo.NET: Nissan 300ZX forum - Flow testing the collector is virtually meaningless given
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Subject Flow testing the collector is virtually meaningless given
     
Posted by Ash's Z on February 15, 2007 at 7:18 PM
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In Reply To You are right: there is more room for debate..... posted by i-xclr8 on February 15, 2007 at 06:39 PM
     
Message the fact only one cylinder is moving air into the manifold at a time. This is why I tested each runner independently of each other.

Had I tested it with your method, your manifolds would have appeared to have performed better, but that would have been based on a flawed test and also lacking the specifics of flowrates of each runner compared to the next.

It is clear by looking at your manifolds why these rear runners are so restrictive - the port needs to have more curvature into the collector than it does. These rear runners are virtually pointing straight out and those gases are impacting almost perpendicular to the outer wall of the collector area. A little bit of refinement here will do the trick, but given that you are working on a new design that looks quite promising, I'm sure this will be properly addressed.

I can see that you are upset about this and I can completely understand, however, keep in mind that I only performed the testing and did so to the best of my abilities and knowledge on the facts of how these components work in the real-world scenario. I would be more than happy to flowtest your upcoming manifolds as well and look forward to seeing their results, but please bear in mind that I have no incentive other than obtaining the data and sharing it regardless of what their qualitative impression conveys. The numbers are only what they are - I have no control over that.




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