Throttle Body Swap Fail, help needed

[Ryze268]

Originally Posted by Bluevitz-rs

did you get this working?

Sadly I didn't, got some longer bolts, made the sandwich plate, installed everything and had a massive vacuum leak between the intake manifold and the tb.

I don't know but it seems the 2NZ-FE manifold is way smaller . I don't even think this mod makes sense on the stock manifold as the entry point on the manifold itself is about 35mm .

I'm going to try and source a 1NZ intake manifold or port out the stock one I have.

Trial and error is necessary, hopefully I'm helping someone who might attempt this as well

[tooter]

Originally Posted by Ryze268

Sadly I didn't, got some longer bolts, made the sandwich plate, installed everything and had a massive vacuum leak between the intake manifold and the tb.

I don't know but it seems the 2NZ-FE manifold is way smaller . I don't even think this mod makes sense on the stock manifold as the entry point on the manifold itself is about 35mm .

I'm going to try and source a 1NZ intake manifold or port out the stock one I have.

Trial and error is necessary, hopefully I'm helping someone who might attempt this as well

There are always challenges to adapting things to an unintended purpose. A 2NZ FE intake manifold is on ebay for $118. It includes free domestic shipping so that would offset some of the cost to ship where you are.

Greg

[CrankyOldMan]

Originally Posted by Ryze268

I don't know but it seems the 2NZ-FE manifold is way smaller . I don't even think this mod makes sense on the stock manifold as the entry point on the manifold itself is about 35mm .
...
Trial and error is necessary, hopefully I'm helping someone who might attempt this as well

I reached a similar conclusion about the 1ZZ throttle body on the Blitz supercharger: the hole in the mounting face on the intake tube was the diameter of the stock TB, so I had to make a custom adapter that used the larger gasket, then connect the adapter with silicone couplers to a different version of the Blitz intake tube. Even if the original Blitz intake tube wouldn't have leaked, there would be very little HP gain because of the small tube inner diameter.

It took almost a year (on the calendar) to get all of the custom parts purchased and fabricated, and three separate tries to machine the adapter. I could repeat the process in about a week if I needed to, but the first attempt always takes me a long time. The next change will be to find and remove the new bottleneck, but that's probably going to require custom fabrication of cast or welded parts.