Does anyone know the bolt pattern for the stock TB? I have searched to no avail. I am changing intakes but the one I am going to has a Accufab on it, no IAC. I want to make an adapter to put my s90 on the intake. I want to cut one today and I wont be back at the car until later.

Thanks guys!

An older post from EvoM says 2.508" x 2.516" for the Evo TB (which bolts to DSM manifolds).

Canadian_CD9A said:

An older post from EvoM says 2.508" x 2.516" for the Evo TB (which bolts to DSM manifolds).

Click to expand...

Awesome man thanks!!

Canadian_CD9A said:

An older post from EvoM says 2.508" x 2.516" for the Evo TB (which bolts to DSM manifolds).

Click to expand...

This was super helpful for making a custom "sandwich plate"

+1 for correct information, thank you!

Can confirm as well. The difference of 0.008” there isn’t going to make much difference from being “square”.

For what it’s worth, I’ve measured and have based my models off a 2.520” square pattern (64mm x 64mm). Since it’s a Japanese engine, dimensions are generally metric. And for something so basic, there’s no reason to do a 63.9mm x 63.7mm bolt pattern.

In any case, oversize the holes just enough and you’ll have plenty of wiggle room without comprising sealing surface or clamp force.