I heard from a while ago that the differecne JDM and USDM ITR TB is that the JDM one has an extra port.. extra port for what..? if it isn't the port, then what's the difference between the 2? Need a quick answer. TIA

 

odd, if anything at all, i would think the usdm to have an extra "port"...for emissions...wtf is that called again....

oh well. bump for you in quest for answer.

the earlier itr's, pre-97's had a smaller tb ID

 

thanks soup.

Anyone else?

 

Your supposed to leave the "port" plugged. It should be the one sticking up on top. I believe it's a vacuum hole which USDM ITR's do not use.

 

too make up for that extra port, the US manifold has an extra port that the JDM one doesnt

 

ahh, i c

thanks h-t

 

JDM TB has a Larger Bore.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyteteg119 &raquo;</TD></TR><TR><TD CLASS="quote">JDM TB has a Larger Bore.</TD></TR></TABLE>

Where did you hear that?

Everyone that I've talked to, people that have measured them, have told me that they are the same size as the USDM tbs.

 

Supposedly 1mm more.

 

this is the first time i've heard anything like that..

 

i have parted out a few jdm itr motors all are 62mm. i dunno about usdm being smaller. i highly doubt it.

 

JDM R TB are 66mm or 67mm. I saw a post a while back where someone measured it. It was a Photo of the Clipers and the TB Showed the DIgital Calipers Zeroed out and then measured the Bore up to 66/67mm and then Back to Zero.

I will try to find it


Modified by Tyteteg119 at 7:35 AM 9/22/2003

 

I'd like to see this post

 

jdm TB 62mm had 2 of them , one bored out by RC and the other one stock ..

 

WHich Side is the Bore Measured From? Spoon Claims that the Standard Bore is 66mm. Which makes sense. The Spoon TB is over bored to 70mm. Tosay that the Stock Bore is 62 is to imply that the thinckness of the Stock TB is greater than 8mm.

I have seen JDM TB's Before but honestly I have never actually measured them. I can't find that thread yet but According to Spoon's write up they increased the Bore of the Standard by 4mm.



EDIT: Japanese doesn't work on here
Please check the http://www.spoon.jp I copied this statement directly from the site. Look under products intake and then look at TB
Even if you can't read Japanese you can understand the "4mm" Says the Diameter was increased by 4mm.

 

Yea i Think so

 

I measured one and it is indeed 66mm. Anyone have those Pics from that other post I am having trouble finding., Darn SEARCH function


If the Stock TB is 62 or 63mm it would be physically impossible to remove that much material to make a 70mm TB. Look at the Picture above the Standard TB can't be more than 3-4mm thick and removing 4mm from the radius would leave you with nothing. the Spoon tb is atleast 1-2mm thick which indicates that the bore diameter could not have been increased more than 4mm.

 

Are you guys measuring different? I doubt that there could be that big of a difference.

 

theres 2 measured for the TB , the one that spoon claims to be 70mm is the outside , went peeps tell you 62mm thats the inside (what bolts to the IM ) you should measure the inside of the TB .

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyteteg119 &raquo;</TD></TR><TR><TD CLASS="quote">I measured one and it is indeed 66mm. </TD></TR></TABLE>

um , you measure ID , not OD...

62mm ITR TB ID.

 

Who messures OD? That is totally useless.

 

Both USDM and JDM ITR TB's taper from 66mm to 62mm.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AssPenny &raquo;</TD></TR><TR><TD CLASS="quote">Who messures OD? That is totally useless.</TD></TR></TABLE>

my thoughts exactly , especially since its a cast piece

 

Maybe he ment the outer taper ID. Like out side/front of the TB

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AssPenny &raquo;</TD></TR><TR><TD CLASS="quote">Maybe he ment the outer taper ID. Like out side/front of the TB </TD></TR></TABLE>

true.

still not what denotes the size of the TB.