63mm TB - ZR-1 Net Registry Forums

XfireZ51 · 02-08-2008

I am moving forward on porting the plenum and IHs. I also have a 63mm TB. Haven't checked yet but is it necessary to port the TB openings on the plenum to match the 63mm TB or are they large enough already?

lbszr · 02-08-2008

The plenum port on mine was 1/16 inch or so smaller than the 63mm, so it got match ported to the tb. gasket doesn't match either.

XfireZ51 · 02-08-2008

Thanks!

LGaff,

I know you have a 63mm on yours. Can you tell if it is port matched or left alone? Is the port opening smaller than the TB?

lbszr · 02-08-2008

I matched the ports to the TB and also the air horn needs opened up to match also.

kenthompson · 02-08-2008

Man, I'm looking at the plenum and those secondary holes are HUGE! What is the difference going to 63MM?

phrogs · 02-09-2008

It should be port matched on the plenum to the throttle body I mean whats the point if you dont port match them together?

Aurora40 · 02-09-2008

Quote:

Originally Posted by kenthompson

Man, I'm looking at the plenum and those secondary holes are HUGE! What is the difference going to 63MM?

If you mean specifics, I believe stock is ~58mm secondary ports. So the difference is 5mm in diameter. If you mean what is the power difference, I don't know.

As an aside, two 63mm TB's and the single 23mm would have the same area as a 92mm single TB.

Aurora40 · 02-10-2008

Man, did he have to shave two of the bolt heads down a lot? That's some serious bores on that thing!

Zr1 Destroyer · 02-10-2008

Quote:

Originally Posted by Aurora40

Man, did he have to shave two of the bolt heads down a lot? That's some serious bores on that thing!

A little bit, but it took about three minutes with an air cutter! You should here it fire up....it sounds like it's gonna suck the shirt right off yer chest.

02-08-2008	#1
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	63mm TB I am moving forward on porting the plenum and IHs. I also have a 63mm TB. Haven't checked yet but is it necessary to port the TB openings on the plenum to match the 63mm TB or are they large enough already?

02-08-2008	#2
lbszr Join Date: Nov 2006 Location: dayton,ohio Posts: 425	Re: 63mm TB The plenum port on mine was 1/16 inch or so smaller than the 63mm, so it got match ported to the tb. gasket doesn't match either. __________________ [FONT=Comic Sans MS][COLOR=red]"I wanna go fast!!"[/COLOR][/FONT] [FONT=Comic Sans MS][COLOR=#ff0000]-- Ricky Bobby[/COLOR][/FONT]

02-08-2008	#3
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: 63mm TB Thanks! LGaff, I know you have a 63mm on yours. Can you tell if it is port matched or left alone? Is the port opening smaller than the TB?

02-08-2008	#4
lbszr Join Date: Nov 2006 Location: dayton,ohio Posts: 425	Re: 63mm TB I matched the ports to the TB and also the air horn needs opened up to match also. __________________ [FONT=Comic Sans MS][COLOR=red]"I wanna go fast!!"[/COLOR][/FONT] [FONT=Comic Sans MS][COLOR=#ff0000]-- Ricky Bobby[/COLOR][/FONT]

02-08-2008	#5
kenthompson Join Date: Jul 2007 Location: Las Vegas Posts: 298	Re: 63mm TB Man, I'm looking at the plenum and those secondary holes are HUGE! What is the difference going to 63MM? __________________ 1990 Grey/Black Too many for the sig.

02-09-2008	#6
phrogs Join Date: Jul 2004 Location: Kalamazoo MI Posts: 1,753	Re: 63mm TB It should be port matched on the plenum to the throttle body I mean whats the point if you dont port match them together? __________________ JOHNNY P Currently own 90 ZR-1 #845 DRM 500 engine package 90 #226 Parts car Hit me up if you need anything.

02-10-2008	#8
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: 63mm TB Man, did he have to shave two of the bolt heads down a lot? That's some serious bores on that thing! __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]