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03-14-2015
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#1 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Frankenplenum
They picked up 15hp with this slight change in the plenum roof
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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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03-14-2015
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#2 | |
 Join Date: Jan 2004
Location: Portland, OR
Posts: 1,047
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Re: Frankenplenum
Quote:
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Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368 |
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03-14-2015
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#3 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Frankenplenum
I want to say its a 380-385 ci car, no mention of cams if I recall.
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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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03-14-2015
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#4 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Frankenplenum
Looks like is 402-408ci
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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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03-14-2015
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#5 |
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,667
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Re: Frankenplenum
Lee, the 15 HP gains does not necessarily mean it's the height of the plenum.
Lingenfelter was also getting 15HP but he went the other way (under) on big inch motors. What this tells us is plenum volume is not enough no matter which way you go up or down. Test this at the track (same day) do some runs with a nicely ported plenum then change out to this plenum,better yet i'd like to try it on my Z. Then if it gains performance i'll just drive away with it.  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 |
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03-14-2015
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#6 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Frankenplenum
It is a crap shoot....plus lets consider who is building it(me) ...so another factor. its also not so pretty....but I am not spending a fortune on it either($125 in it as it stands). Will be interesting to test.
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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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03-14-2015
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#7 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Frankenplenum
For those who are quick to dismiss the increase in plenum size due to it being only a 350
http://www.hotrod.com/how-to/engine/...lly-is-better/ "We tried it on a 303ci motor, a 358, and a 370, and the results were all about the same. The three motors didn't have the same peak power numbers but they all improved by about the same percentage.
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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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03-14-2015
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#8 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Frankenplenum
Pete if you read up on the car, they actually state the intake change gained 15RWHP over the prior test
**if you are saying its doesn't prove adding to the top vs bottom adds HP; I would agree you cannot tie the gain back to where the volume was added
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 03-14-2015 at 09:01 PM. |
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