Frankenplenum - ZR-1 Net Registry Forums

LGAFF · 01-05-2015

Several years ago I bought a plenum from phrogs that was missing the MAP sensor ears. I Siamesed that the Inj housings and the heads....with small intake cams(222 .415 primary/236.425 secondary) I made 441RWHP/7100RPM; that's untuned.

Since then I ported the inside of the plenum removing all of the water passages and guts(There are significant blockages to the #1 and # 2 intake ports, etc. Added a 63MM TB.....

I decided that now I am going to add volume to the plenum; I will be cutting off the roof unshrouding the runners adding an inch, and cutting the bottom off and doing the same.

I am also going to do some air intake testing.....I know people say there is nothing there, but I want to try a few ideas.

Here is where I started with the Siamese

01-05-2015	#1
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,195	Frankenplenum Several years ago I bought a plenum from phrogs that was missing the MAP sensor ears. I Siamesed that the Inj housings and the heads....with small intake cams(222 .415 primary/236.425 secondary) I made 441RWHP/7100RPM; that's untuned. Since then I ported the inside of the plenum removing all of the water passages and guts(There are significant blockages to the #1 and # 2 intake ports, etc. Added a 63MM TB..... I decided that now I am going to add volume to the plenum; I will be cutting off the roof unshrouding the runners adding an inch, and cutting the bottom off and doing the same. I am also going to do some air intake testing.....I know people say there is nothing there, but I want to try a few ideas. Here is where I started with the Siamese __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 01-05-2015 at 09:29 PM.