I didn't take the time to set up a jig or anything, but I actually created a rough mold of the negative space by making some putty in the kitchen and then jamming it between the wheel and arm. I found I had 21-23mm of space depending on whether I measured at the edge of the wheel lip or at the edge of the tire. The space for the tire gets easier as you go up.

So I went ahead and ordered Forgestars with a +22 offset, which will put me 0.65mm inset of my current setup on the outer edge, and 13.35mm inset on the inner edge. That's the wheel of course, and the 315 tire will be a bit puffier so I'm hoping it doesn't take up more than 7mm of the space inside. I can use a 2.5 or 5mm spacer from Z1 to fix that right up if it does, and I'll use a 5 or 10mm spacer in the rear anyway. Will obviously update everyone with they arrive in hopefully 2mo or less...

TL;DR: YOLO hope these things fit

I couldn't trust the measuring I did on Sunday. I do have access to a legit professional fitment tool. But I would need to drive to Portland to get it which is a 4 hour round trip. I may consider it this weekend.

I think you might be in the sweet spot with the +22. I got hold of the fitment tool and set it to +25 and it appears the tire would be rubbing against the spindle just a little. +22 seems to give it a mm or two of clearance. The tool still probably isn't perfect, but it seems to give me a good idea. Now, should I take the plunge and pull the trigger on some wheels, trusting my results?

https://hosting.photobucket.com/imag..._155535(1).jpg

Do it

I was wrong about the fender rule. It doesn't say anywhere that you have to fit the tire under the fender. That should open up some options for 18x11. I mounted 315 on my current wheels today pretty easily. No rubbing and due to the shorter height, a little bit better clearance. I'll take some pics this weekend if I can get the prep on the car done in time

Here's some of the tires mounted
315 on 18x10.5
https://photos.app.goo.gl/QU9b3DN8rLGgWyox7

Finally got it to rub. I'm currently at -3 degrees of camber and my height is at 26.5 inches. I think I can raise the car another half inch and make it work. The rub happened going over a pretty huge dip in the road at speed and the witness marks are pretty minimal, so I'm hoping a little extra height will get me there.

Can we get some picts of them mounted on the car?

Quick album before I get to work on it

https://photos.app.goo.gl/buEqgziPE6cdQgfT9

Go for it! I thought the same thing based on measurements. My calculations suggested +24 would work, but with some uncertainty on the widest part of the tire -- so I figured if I'm going to potentially need spacers either way, I started at 22. I also have the Nismo flares so that helps (though only visually) with any poke.

I think I got it sorted. I'll get some proper photos later today. I will be interested to see what other folks 315 journey looks like. I'll miss the lower stance.

Issa monster truck now

https://live.staticflickr.com/65535/...6e866fd8_c.jpg_BES6507 by brendan sobers, on Flickr

https://live.staticflickr.com/65535/...303703c5_c.jpg_BES6502 by brendan sobers, on Flickr

https://live.staticflickr.com/65535/...5362ba2e_c.jpg_BES6498 by brendan sobers, on Flickr

https://live.staticflickr.com/65535/...4fc437c1_c.jpg_BES6490 by brendan sobers, on Flickr

I'm also back on my project to get a set of non-shitty-to-work-with and legal fuca for the z. I picked up these arms from gk-tech. The plan will be to buy some rod ends to replace the sphericals on the inboard side of the upper control arm. My first thought would be to replace them with the rod ends from the z1 arms which are actually pretty nice. Unfortunately the z1 rod ends appear to be rh thread and the gk-tech need a lh thread. So where I am is I will need a lh thread 3/4 16 rod end with a non metallic cylinder bushing. There seem to be a few off the shelf options available at speedway motors and summit racing but I am open to other sources and input from anyone with fabrication experience.

Before they allowed sphericals in SP I went through the same thing for the rear arms. I just got the rod ends from Speedway and they've worked fine ever since. I did need tp have a local machine shop make me a few sleeves and spacers though to match the OE dimensions though.

Hell yea. You inspired me to try this. So far this is my most promising lead

https://www.barnes4wd.com/Forged-Chr...ads_p_888.html

So not only will it have 4x4 ride height but actual 4x4 parts.
Can't wait to trigger stance bois.

So, I ordered some 18x11 +24 custom made Forgestars. I'm thinking +24 might be a tolerable rub. If not, I'll add some small spacers. We'll find out in 5-6 weeks. I'm hoping to have everything squared away in time for Crow's CT.