We also added a groove for an O-ring to seal the throttle body to the intake manifold.
We were happy with the design and had the adapter plate machined out of 6061 aluminum and then welded it to the intake manifold. This perfectly covers the oval opening of the intake manifold and ensured there would be no restriction for the 80mm throttle body.
The intake manifold years ago, which we covered in Part-5. From this angle, we can see how the 80mm throttle body adapter plate opens up with a nice radius to the oval intake manifold shape.
We made two identical manifolds for our two turbo builds.
We vapor blasted the intake manifold at Mountune USA and installed the lower intake manifold as well as the throttle body O-ring.
The vapor blasted intake manifold (left) has a nice matte metallic finish while the hot tanked manifold (right) looks good, but does not have the same quality of finish.
8 comments
Very clean installation.
I like it when modifications are thoroughly thought out.
Any plans to replace the fuel rail crossover hose? Those get nice and crispy after 30 years of use.
Yes, the entire fuel system is going to be replaced and upgraded in a future article. Stay tuned!
This project is heating up! Excellent work and execution. I can’t wait for the next update.
So sick, bro.
I’d love to see an article about DBW and throttle mapping!
We could do that; there is a lot of information on HPAcademy.com though.
Not that it is necessary with forced induction here, but wouldn’t independent throttle bodies eliminate the space issue entirely? Gorgeous work either way.
While ITBs would eliminate space issues, it will cost (depending on which brand ITBs) $10K – $15K – $20K or more to have a DBW ITB setup with a custom plenum for forced induction. Our solution of cutting the stock intake manifold, making a billet adapter plate and used Mustang throttle body was around $500.