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.

Locobob · 02-09-2008

The stock plenum throttle bores are 59.5mm in diameter. You should open them up to 63mm otherwise your wasting your money on the larger throttle body.

LGAFF · 02-09-2008

I just checked my car, it has the 415DRM package....

TB measures to 63mm

Intake opening 60mmm???????????????????????

Good catch Dominic! I assumed they would have opened it up since the intake was extrude honed, etc. I'll put that on the list.

LGAFF
92 ZR1
#234

Zr1 Destroyer · 02-09-2008

Get in touch with Greg V. in Oklahoma.....he did nj's last year and was the largest one has has ported to date! It's so nice lookin it was a shame to mount on the car instead of using it for wall art!

....and the finished results......

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	#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.

02-08-2008	#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]

02-09-2008	#8
Locobob Join Date: Jan 2004 Location: Portland, OR Posts: 1,057	Re: 63mm TB The stock plenum throttle bores are 59.5mm in diameter. You should open them up to 63mm otherwise your wasting your money on the larger throttle body. __________________ Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368

02-09-2008	#9
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: 63mm TB I just checked my car, it has the 415DRM package.... TB measures to 63mm Intake opening 60mmm??????????????????????? Good catch Dominic! I assumed they would have opened it up since the intake was extrude honed, etc. I'll put that on the list. LGAFF 92 ZR1 #234 Last edited by LGAFF; 02-09-2008 at 10:18 PM.

02-09-2008	#10
Zr1 Destroyer Join Date: Oct 2005 Location: Candy Apple...yUmMy Posts: 1,137	Re: 63mm TB Get in touch with Greg V. in Oklahoma.....he did nj's last year and was the largest one has has ported to date! It's so nice lookin it was a shame to mount on the car instead of using it for wall art! ....and the finished results......