zep's Gemini Coupe

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I finally got around to fitting the rear wheels to assess how much room I have in the wheel wells and see how much I need to shorten them by. Turns out I have hit a snag that might turn into a blow out of a range of proportions.

Here's where I'm at with the fitment:

Looks like I have about ~33mm to try get in the arches. Looking from the other side, there is about 50mm between the tire and the chassis rail, so I figured that's not too bad. However, there is a decent amount of meat where the inner and outer guard skins meet, so I'm really working with only about 10mm of extra space in there. From the outer fitment point of view, I will definitely have to pull out the guards some -the plan is to keep them looking as stock as possible. I thought I could remove the inner skin where it meets the outer and weld it back in higher - not sure if this is a legit thing to do or not? Do I need double skin all the way down?

The other issues is this:

I only have about 7mm of spline I can cut off. And because the axle tapers in, I can't put the splines in the exact place I need them to be if I were to cut new ones. I've spoken to a bunch of diff places and none recommend filling and cutting new ones, so I figure I have 3 options.

1. Find some longer 5 stud axles that I can cut off after the taper and respline. I've looked around and turns out 5 stud ones (with the right centre bore diameter for my wheels) are pretty hard to find. Most seem to be 6 stud.

2. Get some billet axles. There are PLENTY of places that will make axles to a custom length in 30 spline and whatever stud pattern you want. The main problem is that none of them make an axle with the hillux bearing size. I could go down this route and try to find a bearing that will match the housing on the outer and whatever axle I choose on the inner. I did a quick check on ford 9" and couldn't find any in the right specs. I need to look a bit harder and longer as there are heaps of different axle diametres out there.

3. Convert to full floating. Today I spoke with a guy who makes full floater kits. You cut off the housing flange and weld on the one he give you, buy his axles which will be made to fit, and bob's your uncle. This is considerably more expensive than just buying axles and from what I've read, the only real benefit comes from if you ever snap and axle, which I feel like I'm unlikely to do.

Any thoughts on this?

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I have since has a chat with a man who knows everything about Hilux rear ends and have been assured that I can use any axles from any Hilux or Hiace. Now I just need to find the widest one possible!

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Wow! I really haven't updated this in a while. There's been a bit of progress in the last 7 months, but not a heck of a lot. I've been mucking around with brakes, dashes, diffs and cooling.

In the end, I decided that shortening my axles the "build up and machine down" way was going to be okay, so I sent them to Howat Engineering and had 35mm lopped off and the splines cut back on.

I then took the housing to Tin Tricks where it had the Gemini mounts cut off, was shortened and had the 4-link brackets slid on.

I left the ladder bar mounts on so it still had a way to mount to the car when I had to move it. Turns out I was spot on with my measurements. The wheels just sit inside the arches - will need some work done to get unobstructed bump - and I have about 15-20mm clearance on the inside. So pretty happy.

I've also spent a bunch of time prototyping up some parts with the 3D printer.

Throttle body adapter:

Brake caliper adapter:

Master cylinder adapter:

And for those of you who recall ages ago I was trying to make a new tacho face for my dash, I've gone in too deep. I've designed and printed up an adapter which uses all the stock mounting points and screws, as well as a new face which has the cutout for my CAN screen:

I then had it MJF printed in PA20 nylon. Unfortunately it warped so I need to have another go and add some ribs in to strengthen it.

I was planning to paint it myself using modelling paints, but I'm not sure that I have the ability. I spoke with Charlie's Pinstriping out west who said they could do it. When I get around to fixing up and printing a new version I'll take it up.

Last thing that I've been doing for quite a while is working with Ross Performance in Australia to develop a harmonic damper and water pulley for the Isuzu 4Z engines. They have pretty much finished, I'm just waiting on one or two people to test some 3D printed templates to make sure everything lines up.

And lastly I have been talking with Skeleton Welding down south to build me a new radiator. It's been a bit of a packaging saga to try and fit the radiator, intercooler and oil cooler up front. But I think with a bit of ingenuity I'll be able to make it work. Speaking of the oil cooler, I got this "cool" one from CSF:

The car is now in at Shores NZ having the 4-link boxes welded in and the rear turrets strengthened for coilovers. So progress is happening!

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Things taking a little longer than I had hoped, but yesterday I got some good news. The 4-link boxes are in and I'll go and have look on Friday and figure out what the next steps are.

I also heard from Skeleton Welding that my core has arrived, so should be getting that sorted to soon too! Pretty happy with the progress.

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Almost done with the 4-linking. Tim has opened up the tunnel so nothing can hit at full bump, and closed up the channel that was cut for the old ladder bar.