Frankenplenum - Page 8 - ZR-1 Net Registry Forums

cvette98pacecar · 03-14-2015

Lee, check to see how much clearance you have from the front of the throttle body to the hood. If you have room and you are doing this many mods you may want to raise and center the TB with the center of the plenum.

LGAFF · 03-14-2015

They picked up 15hp with this slight change in the plenum roof

cvette98pacecar · 03-14-2015

Quote:

Originally Posted by Tony Davila

It looks like you are building or modifying the intake just like this ZR-1 that is in Japan. Keep it up, I'm watching how it turns out.

I just noticed that car has Gen 2 Dymags

Locobob · 03-14-2015

Quote:

Originally Posted by LGAFF

They picked up 15hp with this slight change in the plenum roof

Interesting.... what all do you know about this motor?

LGAFF · 03-14-2015

I want to say its a 380-385 ci car, no mention of cams if I recall.

LGAFF · 03-14-2015

Looks like is 402-408ci

Pete · 03-14-2015

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

LGAFF · 03-14-2015

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.

LGAFF · 03-14-2015

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.

mgbrv8 · 03-14-2015

Good old West racing. Ledgend has it they have played with flat plane cranks in LT5s ;-)

https://www.facebook.com/video.php?v...15605822403339

Dave Hetrick

Quote:

Originally Posted by Tony Davila

It looks like you are building or modifying the intake just like this ZR-1 that is in Japan. Keep it up, I'm watching how it turns out.

03-14-2015	#71
cvette98pacecar Join Date: May 2011 Location: Sydney, Australia Posts: 2,479	Re: Frankenplenum Lee, check to see how much clearance you have from the front of the throttle body to the hood. If you have room and you are doing this many mods you may want to raise and center the TB with the center of the plenum. __________________ Robert J. DeMarco [SIGPIC][/SIGPIC] [COLOR=blue]G[/COLOR][COLOR=red]rand[/COLOR] [COLOR=blue]S[/COLOR][COLOR=red]port[/COLOR] Registry Lifetime Member NCM Lifetime Member #2655 Pacecar Registry Member [COLOR=red]ZOOM Charter Member - ZR-1 Owners of Michigan[/COLOR] [COLOR=plum][I]ZR-1[/I] Registry member since 2012 [/COLOR] [COLOR=black]1990 LPE "368" Aerobody ZR-1, Last ZR-1 built by John[/COLOR] 1991 Callaway Aerobody ZR-1, DRM 500 1991 Shinoda Aerobody Spyder, 1998 Pace Car

03-14-2015	#72
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,186	Re: Frankenplenum They picked up 15hp with this slight change in the plenum roof __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

03-14-2015	#75
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,186	Re: Frankenplenum I want to say its a 380-385 ci car, no mention of cams if I recall. __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

03-14-2015	#76
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,186	Re: Frankenplenum Looks like is 402-408ci __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

03-14-2015	#77
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,680	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 __________________ '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

03-14-2015	#78
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,186	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. __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

03-14-2015	#79
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,186	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. __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359