Stredrotor's RX4 Coupe * Project 20B *

[Stredrotor]

I got the laser cut parts back this week so I started work on the 2 link mounts.....

This is the CAD model.


This is the mount for the chassis.


These are the mounts to go on the diff housing.


And here are they all are with a bit of a mockup.

[Red Baron]

Can't wait to see the end product.

[speedjunkie]

^Me too. Should be badass.

[Stredrotor]

I found a bit of time to get some welding done this morning.

Welded up the two link diff mounts.




...and the links themselves.




Painted and fitted.



When I am happy that I have finished with the diff I'm getting it powercoated.

[Stredrotor]

Ok a bit of an update!

Here's my latest investment...


Tremec TKO 600 5 speed with Carbon Syncros, Brass fork pads and with an Ultimate Street short throw shifter, Quarter Master Hydraulic bearing, slip yoke for the tailshaft, a Direct Clutch twin plate, and a Green Brothers steel bell housing.

I have to do a little mod to the box to suit the RX7 turbo starter and fabricate a gearbox cross member, I will detail this later.

[RedR1]

im glad to see the project is still going strong. lovin it!!

[Stredrotor]

Had to make a mod to the TKO to clear the starter for Green Brothers bellhousing.

Some of this area has to be removed and a new hole drilled.


Marked out the material to be removed and drilled new hole.


Chopped! A bit un-nerving on a brand new gearbox


Bellhousing back on. Just need to get hold of a turbo RX7 starter to double check fit up.

[Stredrotor]

Just for interest, this is the difference between my old SV RX7 box and the TKO.

670mm Vs 730mm from belhousing face to shifter position. The RX7 box I had already done the shortened shifter housing mod.

[Stredrotor]

I put the TKO on the back of the 20B today and dropped them into the engine bay to measure up the gearbox cross member.
Sorry I don't have any pics at the moment as the missus is away and she took the camera and my phone is no better than a potato.

The TKO fits the RX4 transmission tunnel very well and shouldn't need any "clearancing".

I have measured up and modeled the gearbox cross member.


Turns out to only need a very simple design .

[Stredrotor]

Here's the photos of the fit up...


The shifter comes out pretty close to the factory hole. (Already butchered for the early RX7 box when I bought it ) The engine is 50mm further back than factory so normally would be spot on.


Good clearance around the firewall.


Not bad around the trans tunnel either.

As soon as I get the laser cut parts back I'll fab up the cross member.

[Monkman33]

Wow. This build is great! I really like how much fabrication you are doing on your own. And your rubber isolated transmission crossmember is great!

[Stredrotor]

I added some gussets to my CAD model just to stiffen things up.


Got my laser cut parts back so welded it all together.



Bolted in place.


Checked the dump pipe for clearance as well. All looks sweet!

[Whizbang]

who are you using for laser cutting?

also, this bell housing is new to me. Is it a one off or a produced item?

[Stredrotor]

Originally Posted by Whizbang

who are you using for laser cutting?

also, this bell housing is new to me. Is it a one off or a produced item?

I use a local Tasmanian sheet metal company, SERS. They do a lot of work for the Caterpillar factory I work at.

The bell housing is made by Green Brothers Racing in New Zealand, www.greenbrothers.co.nz. They build in batches as they get orders. They make a Supra to Rotary steel bell housing as well as the TKO and some adaptor plates to use the Mazda cast bell housing.

[Whizbang]

this might sound silly, but the TKO does not share the same pattern as a T-5 tremec correct?