nzae86's TRD ae86 N2 Race Car Project 2,

[nzae86]

roman Wrote:Just read the entire thread, fantastic build.

I aspire to be able to build a car to a similar quality one day.

It's also great to see your patience and persistence in answering questions about the build.

One question about your TRD injection manifold...

Almost everyone who I've talked to has insisted that the best way for trumpets is to have a large radius/lip, and the trumpets projecting into an open space, rather than flush mounted against a plate. As apparently a lot of the air flow comes from up around the sides.

How did the original TRD setup operate, were they enclosed in a box?

I have seen another picture that had a carbon fibre box on the end of what appears to be the TRD injection manifold, but with bellmouth extensions on it.

These throttle bodies where used on the cars with an air box to suit the swift and ralt chassis , they did run a very small trumpet on the end , but the throttle body has a machined bell mouth in it as part of it's manufacture. I suppose TRD would have done a huge amount of testing on their setup , as you can see that this is the later setup where they ran the injectors from underneath the body , firing the fuel to the top of the inlet port giving it better atomization and swirl.