Custom Intake manifold!

[CrankyOldMan]

What's the throttle body flange inner diameter? I've been thinking I want to try and fab up my own to get the full 1ZZ tb diameter instead of necking it down to stock.

[monchyxb]

Originally Posted by CrankyOldMan

What's the throttle body flange inner diameter? I've been thinking I want to try and fab up my own to get the full 1ZZ tb diameter instead of necking it down to stock.

I think its a little bit more than 2.25". Huge response when going WOT. If you want to do it you'll have to make a custom flange since the throttle is 4 bolts instead of 3.

[CrankyOldMan]

Originally Posted by monchyxb

If you want to do it you'll have to make a custom flange since the throttle is 4 bolts instead of 3.

Crap, I knew there was a catch! I thought there were some drive-by-wire TBs with three bolts, but looks like only the cable driven ones have 3. Does it look like the end of the plenum could be cut off and re-welded with a new flange? The only pic I could find online was a side view that doesn't show the TB port.

[monchyxb]

Originally Posted by CrankyOldMan

Crap, I knew there was a catch! I thought there were some drive-by-wire TBs with three bolts, but looks like only the cable driven ones have 3. Does it look like the end of the plenum could be cut off and re-welded with a new flange? The only pic I could find online was a side view that doesn't show the TB port.

Yes you could cut were the throttle is bolted on and make a flange for the other throttle and weld it. It has the space to do it! Or you could use the throttle that comes with the manifold which is bigger than the 1nz.

[CrankyOldMan]

Originally Posted by monchyxb

Or you could use the throttle that comes with the manifold which is bigger than the 1nz.

The yaris uses electric throttle control (DBW), not a cable like the xB. There are plenty of 1.8L throttle bodies for the 4-bolt pattern with DBW, but none that I can find with the 3-bolt pattern and DBW.

[monchyxb]

Originally Posted by CrankyOldMan

The yaris uses electric throttle control (DBW), not a cable like the xB. There are plenty of 1.8L throttle bodies for the 4-bolt pattern with DBW, but none that I can find with the 3-bolt pattern and DBW.

I see, well then you have to make a flange from 3 bolts to 4 bolts like I did. If you look at my first picture look at the spacer between my manifold and throttle. You'll need to make a flange that bolts to the 3 bolts of the manifold and on the opposite side of the flange put 4 studs(symmetrical to the throttle) in which you will bolt the new throttle. Wish I had the pictures of the flange so I can show you, but its pretty easy and I can to help you out with questions If you are going to do that.

[CrankyOldMan]

Originally Posted by monchyxb

I can to help you out with questions If you are going to do that.

I know it's a bit late to get measurements off of the one you just installed, but if you could find a way to get the dimensions of the head-end flange holes, that would be great. If someone has a spare 4-bolt TB handy and could do the same for the manifold-side of the 4-bolt TB, that would also be great. I was thinking that you might be able to do a rubbing with a piece of paper and a crayon or pencil, or just trace around the edges and holes. I'm not entirely sure how you would transfer the image to the interwebs, but a scanner or something could be used. Hell, maybe even snail mail?

Edit:

I just picked up a manifold yesterday, and ordered a TB last night. The only thing I need to get this project rolling is the dimensions and layout of the cylinder head flange. Do you by chance know if the cylinder spacing is the same on the 1NZ and the 1ZZ?