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10-05-2009
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#1 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Any results on Siamese vs Ported intake
I have a spare plenum and a set of IH cores on the way back to me(hopefully). Does anyone have Dyno results showing impact of a siamesed plenum vs 36mm porting?
I was thinking of doing one. I am very interested in it for my 92 with 4.09 gears. Thoughts??
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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10-06-2009
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#2 |
 
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Re: Any results on Siamese vs Ported intake
Lee,i have done huge siamesed plenum and huge siamesed IH's on my Z.
I did a before and after dyno with no gains just some low RPM loss from what i can remember 10+- rwp, it was a while ago. I have dyno sheets somewhere in my garage file cabanet. On big cube motors doing the siamesed/droped plenum,IH is worth 10-12rwhp. Hogan's intake was worth 12rwhp on a big cube motor over a ported 36mm plenum/IH's It raised peak power from 6800 to 7k. I took the divider out of my plenum did not touch the IH's. Ported plenum/IH's to something close to 38mm.  I have not noticed any change,throttle response is crisp better then a stock Z. Pete
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'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage Last edited by Pete; 10-06-2009 at 01:13 PM. |
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