Worth it to swap to a 3rd gen intake on a 2nd gen T2? What all is involved?

Thx

 

I'm assuming you mean upper intake manifold? You're going to need to detail what you've got going on in this car. If you're not making big power, it's not worth the effort, and even then plenty of people make good power on the TII mani.

 

Yeah that's what I had heard before that you could swap the upper along with the throttle body. I'm putting my car back together and just considering my options for upgrades. The old throttle body looks that just really old. I know the TPS is shot so I was thinking about what I could do. I'm not looking to make big power but I am planning on going with a Haltech RE. Planning anyway....

 

There is SOME merit to the FD UIM. There's a thread showing some slight overall power band and torque gains. I have one on my car myself, but most people just do it for looks.

 

You're basically increasing the runner length slightly which accounts for the midrange torque boost. Also the TPS is of MUCH better design than the FC.

You'll need to either modify the flange or use an adapter to connect the FD upper to the FC lower. If you have an FD upper, have things already apart, have the standalone (which you do) and can make/get an adapter, then you're already most of the way there. Throttle cable needs to be adapted and of course you'll need a new throttle body adapter for your intercooler piping.

 

A lot of good information guys thanks! What about just swapping the throttle body? Is that doable? Does anybody sell an aftermarket throttle body?

 

You can find adapters for a different throttle body but then again you need to get the TPS to work too.
The FD TB will not just swap to a TII.The flanges etc are different.Same with the manifold..you need to modify "something" in order to mate the FD upper onto the TII engine.

Look at the Threads in SEC GEN SPECIFIC..a guy is selling adapters for FD upper...you should be able to get some pics etc.,.

 

28ftlbs max torque gain at 5,600rpm on a 350rwhp FC and its a broad bump from 4,700rpm to 6,400rpm.

Smaller 20ftlbs max bump in torque 4,000rpm to 4,700rpm.

Tiny 3ftlbs bump in torque 7,100rpm to redline.

Tiny 3ftlbs loss in torque 2,600rpm to 3,200rpm.

Definitely not simply low rpm torque gains from longer runners.

It is the improved dynamic effect intake supercharging, increase in flow potential and decrease in plenum volume (pumping losses) in the FD UIM providing the gains.

Here is the thread.
https://www.rx7club.com/2nd-generati...fc-uim-655708/

 

Thanks again Guys. I'll look into those threads and 2nd gen forum section!

 

Right, forgot the FD intake borrowed the horseshoe design from the FC.

 

Yeah, from what I have read it has been a continual improvement on the EGI rotary intake manifolds.

I think the GSL-SE had a similar split level plenum, but it had square corners.

For the FC they found they could round the corners for better acoustics.

If you cut the FC TII plenum open you find the 2ndary runners are actually really long because they curve all the way around to the bottom of the plenum where they meet in the "U".

Then for the FD they flattened the 180 degree bend in FC UIM to 90 degrees and worked on getting everything more "inline" for better flow.

Last for the RX-8 they put really defined "U" bends connecting front and rear rotors for primaries, 2ndaries and auxiliary port runners. They went all out on the "U"s.

Now, the 16X manifold- hard to say as of yet. Looks like it could incorporate connecting primary to primary and 2ndary to 2ndary with "U" bends, but the whole thing looks like it if focused on high flow as the priority.