Thinking of changing your intake? See what the VFAD does.
08-21-2007, 09:54 AM
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Thinking of changing your intake? See what the VFAD does.
Page 7 of this document summarizes how the Renesis intake works.
Note the volumetric efficiency curve from 4500-5500 RPM.
You may download it.
http://208.62.166.66:82/guest/Shop_M...evelopment.pdf
Note the volumetric efficiency curve from 4500-5500 RPM.
You may download it.
http://208.62.166.66:82/guest/Shop_M...evelopment.pdf
Last edited by SureShot; 08-21-2007 at 09:57 AM.
08-21-2007, 10:50 AM
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It's about how "standing wave resonance" dynamically improves the intake.
On the Renesis the VFAD accounts for the bulge in the 4500-5500 range.
The "trombone" rig in the R26B was built to expolit the same principal.
It's not such a big deal in a turbo, but it's a big deal to NA's
On the Renesis the VFAD accounts for the bulge in the 4500-5500 range.
The "trombone" rig in the R26B was built to expolit the same principal.
It's not such a big deal in a turbo, but it's a big deal to NA's
Last edited by SureShot; 08-21-2007 at 10:56 AM.
08-21-2007, 11:37 AM
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oh and actual volumetric efficiency as measured "in the field" by Hymee and discussion of same(its greater than 100% at times)
https://www.rx8club.com/showthread.p...ght=volumetric
https://www.rx8club.com/showthread.p...ght=volumetric
08-21-2007, 12:06 PM
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He even mentions the Exhaust aspects of this concept which I plan to exploit in the near future.
(Now - don't tell the Honda ricers or Stang fanatics.)
-Bill
08-22-2007, 12:19 PM
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Unless I read right over it in the linked threads, I don't think anyone has touched on variable-width pipes...
Are there formulas for finding out how the frequency of air changes if a pipe widens or narrows? Rather than using an intake that shortens/grows as RPMS change like the 787B, you could install a rubber tube that stretches/pinches based on engine speed...
...I'm no expert on the subject, so I could be suggesting something completely unfeasable/unhelpful. I still need to sit down with some material and research the subject :\
Are there formulas for finding out how the frequency of air changes if a pipe widens or narrows? Rather than using an intake that shortens/grows as RPMS change like the 787B, you could install a rubber tube that stretches/pinches based on engine speed...
...I'm no expert on the subject, so I could be suggesting something completely unfeasable/unhelpful. I still need to sit down with some material and research the subject :\
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