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DZEE'S LX · 02-05-2002, 11:21 PM

So I've decided I better get a 65mm TB to go along with the goodies I'm adding (see below). After searching the many posts on TB issues I thought I had it figured out. (Thanks also to Jimberg for your help.) As I talk to my Motorsport guy to order one he wasn't quite sure how to handle my questions on whether or not I need the 65mm EGR plate. So I tell him I'll measure my stock plate with dial calipers and see how it compares.

Here's what I get. And I just multiplied the inside dia's by 25.4 to get mm's.

Upstream side of TB: 2.420" = 61.47mm
Downstream side of TB and also EGR plate: 2.440" = 61.98mm
TFS intake: 2.950" = 74.93mm

I thought stock TB's were like 58 mm. If so I'm like halfway to 65mm already.
Am I measuring this right?
Is it a no-brainer to match the EGR plate size or do you blend a little to match the dia's?

BTW: Summit has a 1" TB spacer that claims 20 hp.....whats up with that?? Why wouldn't everybody immediately do that if it's so great. Would one of these help me with my combo?

Any help is appreciated.

Dan

02-05-2002, 11:21 PM	#1
DZEE'S LX Registered Member Join Date: Jan 2001 Location: Salt Lake City Posts: 117	How can my TB be this size??? So I've decided I better get a 65mm TB to go along with the goodies I'm adding (see below). After searching the many posts on TB issues I thought I had it figured out. (Thanks also to Jimberg for your help.) As I talk to my Motorsport guy to order one he wasn't quite sure how to handle my questions on whether or not I need the 65mm EGR plate. So I tell him I'll measure my stock plate with dial calipers and see how it compares. Here's what I get. And I just multiplied the inside dia's by 25.4 to get mm's. Upstream side of TB: 2.420" = 61.47mm Downstream side of TB and also EGR plate: 2.440" = 61.98mm TFS intake: 2.950" = 74.93mm I thought stock TB's were like 58 mm. If so I'm like halfway to 65mm already. Am I measuring this right? Is it a no-brainer to match the EGR plate size or do you blend a little to match the dia's? BTW: Summit has a 1" TB spacer that claims 20 hp.....whats up with that?? Why wouldn't everybody immediately do that if it's so great. Would one of these help me with my combo? Any help is appreciated. Dan __________________ Spec Service (UHP), BFG G-Force KDW's, Turbo Coupe 3.55 rear w/disks, 73mm calipers, Stg 1 Twisted Wedges, TFS Street Intake, 70mm TB, E cam, Crane 1.7's, Aeromotive FPR, BBK 1 5/8 shorties, elec fan, FMS Al Radiator, Moroso Wires, Kenne Bell Ramair, March pulleys, Race Magnums, 190 lph Walbro, FMS Al Dshaft, D/S loop, MM 4point rollbar, FMS C spngs, strut tower brace, Tokico Illuminas, Prothane bushings, MM Lwr Conrol Arms, KB welded subs, Cervini Mach 1 hood/valence/side skirts/wing/airdam.