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This is for anyone interested in widening the front track width by about 1/2".. 86 - 88 RX7 ball joints are a direct bolt in swap... You can use stock axles with no problems... This swap also helps control arm angles a little bit for people who are lowered..

two mx3 lower ball joints and the Rx7 ball joint...


This is where it gets tricky... There is a change over in ball joints on the mx3... 94+ use a larger ball joint.. You need knuckles off the later model that use this larger ball joint in order to make this a bolt on swap...

Rx7 ball joint


94+ mx3 ball joint


earlier mx3 ball joint



Old stock ball joint...


Rx7 ball joint

crazycanadian wrote:This is for anyone interested in widening the front track width by about 1/2"..

Noobie question alert here.

What would be the benefit of this? Improved traction/handling?

Helps add a little camber with out camber bolts/plates... If you use offset rear control arm bushing the rx7 ball joints will add a little more caster as well...

helps lower control arm angle, trying to get it a little more parallel to the ground..

helps camber curve a little bit while cornering...

Its a small piece in the puzzle when setting up your suspension to get the best handling you can out of it....

Nice one this is good might have to do this as I seemed to have maxed out my front camber plates on my coilovers from being so low. Thanks for sharing!

I completely forgot about this mod, very nice. We should make sure that this is in the FAQ section.

I think I should do this to the GS

I wondered about this same thing when dismantling an 87 RX7 parts car I had for a while, but instead of digging out my MX3 ball joints, I went on to other projects after shedding the shell and storing parts for my RX7.
I'd like to see a few pics of the car's stance after this swap and a proper alignment. It's not a big difference, but I'd still like to see it. Very soon, I'll be upgrading my GS suspension and rebuilding the front end, including ball joints...

stepchyld wrote:I wondered about this same thing when dismantling an 87 RX7 parts car I had for a while, but instead of digging out my MX3 ball joints, I went on to other projects after shedding the shell and storing parts for my RX7.
I'd like to see a few pics of the car's stance after this swap and a proper alignment. It's not a big difference, but I'd still like to see it. Very soon, I'll be upgrading my GS suspension and rebuilding the front end, including ball joints...

I don't have any good pictures of my cars stance before and after. Also my alignment is all custom set up for autocross racing. I run -3 deg camber in the front and 5 deg caster with a little bit of toe out.

dont they make special ball joints for RX7´s that are lowered a few inches?

Good catch^^^^

I think they do, will have to look around. That would be a way to drop the front of the GS a bit more without taking out the helper springs....

Josh, do you have Ground Controls, or full coilovers?

If you've got a spacer between your primary and helper springs, you COULD remove it and weld the end of the springs together, or go for a thinner spacer. I almost opted for my thinner spacers(I had 2 sets), but decided to use the custom ones permin made originally, and I'm glad I did... but I do have a set of thinner spacers if you're in need.

MrMazda92 wrote:Josh, do you have Ground Controls, or full coilovers?

If you've got a spacer between your primary and helper springs, you COULD remove it and weld the end of the springs together, or go for a thinner spacer. I almost opted for my thinner spacers(I had 2 sets), but decided to use the custom ones permin made originally, and I'm glad I did... but I do have a set of thinner spacers if you're in need.

So you are the guy that bought Robs old coil over set up. I remember that set up, Rob did a lot work to get things to fit.

Josh any pictures of the ball joint you are talking about for lowered Rx7s?

Indeed I am, and the setup is fantastic.

I did have issues initially, but he was using Tokico Blues, and I bought brand new KYB Excel-G struts for the setup. I wasn't able to use the spacer below the threaded collar, and had to get creative with the strut bump stops. MoonEggs hooked me up with a few OEM ones, and I managed to make it work after a while.

The problem wasn't in his designs at all, only the fact that the KYB struts are slightly wider than the lower spacer, and I didn't have the means to modify it to fit.

The feel is fantastic, although I may go with adjustable dampening struts when I get more involved with racing.

crazycanadian wrote:

stepchyld wrote:I wondered about this same thing when dismantling an 87 RX7 parts car I had for a while, but instead of digging out my MX3 ball joints, I went on to other projects after shedding the shell and storing parts for my RX7.
I'd like to see a few pics of the car's stance after this swap and a proper alignment. It's not a big difference, but I'd still like to see it. Very soon, I'll be upgrading my GS suspension and rebuilding the front end, including ball joints...

I don't have any good pictures of my cars stance before and after. Also my alignment is all custom set up for autocross racing. I run -3 deg camber in the front and 5 deg caster with a little bit of toe out.

ok, thanks.
I would love to get into autocross! -but don't have the funds, and I don't think there's a local group, just a dirt track and a drag strip around here.
Sounds like a nice setup, a lot of work, but well worth it, I bet!

I'll be installing Tokico Struts (ZX2 S/R) and Eibach Lowering Springs (MX3 GS). If using the RX7 ball joints, is there anything else I'd need to do to it?

kulluminati777 wrote:dont they make special ball joints for RX7´s that are lowered a few inches?

Nope they dont. Everything you find is custom made.

I know there used to be, perhaps they were custom ball joints. I did some searching and could not find anything.