I just got a 55mm TB and the plate is smaller in diameter than the bore.

It's mounted flush to one side and the gap on the opposite side is about .030 when I hold it up to the light.

Wouldn't this royally screw up my idle?

I don't want to R&R the TB in that condition. I'm thinking it needs a new plate first.

Shouldn't they be a near perfect fit? Like the plate shouldn't be more than say .0005 (half a thousanth) smaller?

I couldn't find anything like this in the search so I really need someone who knows. Thanks again guys.

Loosen both of the tb plate bolts, open the tb, wiggle plate and let it back down.

Ive had this happen on the Jeep TBs I made. Most of the time this will clear it up!

If you cant fix it that way you could always add a thin layer of JB weld and sand it smooth to make the gap smaller.

98 Eclipse GS Turbo
Built motor - MS2 - Holset hy35 - Zoom Stg 4 Clutch - 57.5mm TB - ARP Headstuds - Turbonetics wastegate - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - 650cc Injectors - Fidanza Flywheel - Cobra calipers w/ 13" Rotors - Oil Cooler - DevilsOwn meth injection

1981 Chevy Scottsdale
1987 Nissan 300zx - Chump Car
2001 BMW 325i

That's a good idea. I just might have to do that. I'll probably take a stab at making a new plate first though. Thanks

Yes, its incorrectly machined. Send it back to get it fixed, if you can. I got one like that from CI. I tried to contact them for the longest time but gave up.

I have made my own plates. It is a bit of a difficult, painstaking task to do without machinery (I did it by hand with a holesaw, grinder and sanding "items").

Depending on the amount of gap, it may or may not affect you all that much. I wouldn't do the JB weld trick.

Captain Caveman

96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq
97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq
98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats
99 OZ 5sp Stocker 15.856 @ 85.97
99 GS stocker auto 17.7@77mph!

wiki home page:http://www.2gnt.com/index.php?d=bullettdsm

Yeah Mark, it was slipshot machining. I could have done the backyard fabrication better than what they did. Luckily I got the use of a Bridgeport mill and was able to make it tits with the digital readout.

Captain Caveman

96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq
97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq
98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats
99 OZ 5sp Stocker 15.856 @ 85.97
99 GS stocker auto 17.7@77mph!

wiki home page:http://www.2gnt.com/index.php?d=bullettdsm

OK, tried that to no avail. Did I mention that the plate shuts perpendicular to the body?

The problem is IMO that the plate is too small and the plate diameter is non-concentric to the bolt holes. (bolt circle) That's why it's all over to one side.

Made a new TB plate today-it fits very nicely now.

Looked like the old plate had the bolt pattern offset about .015/.020 and was sanded in on the fat side leaving the gap on the thin side.

Hopefully it'll stop raining this weekend so I can swap it out.

Originally posted by teklein

Originally posted by Nemo Made a new TB plate today-it fits very nicely now. Looked like the old plate had the bolt pattern offset about .015/.020 and was sanded in on the fat side leaving the gap on the thin side. Hopefully it'll stop raining this weekend so I can swap it out.

Awesome! And ive changed TB's in the rain before, you wont get too wet. GO FOR IT!

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!

lol, I love the rain but only work in it if I have to. Sunday's 'sposed to be dry. I'll wait.