Stredrotor's RX4 Coupe * Project 20B *

[Stredrotor]

A bit more progress!

I have made my rear caliper brackets to adapt the RX7 calipers to fit the Toyota Hilux diff housing.

First I created a CAD model of the diffhousing, axles, bearing and housing, disk rotor and a rough model of the RX7 caliper.


Then I printed a 1 to 1 drawing of the profile an cut it out of MDF.



Then ground out the step down.


When I was happy with the fit I created a DXF file and had them laser cut and had a mate mill the step into them.


And here is one fitted!




I also bought some new rubbers that go top and bottom of the leaf springs. Bought almost the last lot that Mazda had left.

[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.

[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.

[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.

[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!