Dusterbd13-michael
Dusterbd13-michael MegaDork
11/7/21 7:56 p.m.

Using a whole rx8 front suspension in the new race car. Hub to hub. 

It comes with a gigantic electric power steering rack that doesn't work outside of the rx8. And is in the way of oil pans. 

 

Im failing at Google. 

What racks work, and how is it done? If theres not an "easy button" answer already,  what and how do i do things to not create bumpsteer and travel issues? 

I don't care if hydraulic or manual at this time, i can work with either. 

Keith Tanner
Keith Tanner MegaDork
11/7/21 8:01 p.m.

I'd start with NC Miata, it's not electric and they're platform partners. Also, the rack mounts to the subframe and the subframes have the same mounting points...can you find an NC Miata front suspension instead?

What's the distance between the inner pivot points on the tie rods? That's the important number.

Dusterbd13-michael
Dusterbd13-michael MegaDork
11/7/21 8:18 p.m.

In reply to Keith Tanner :

Problem is finding a complete drop out for $100 again. Challenge budget and all. Additionally, its going in an amc spirit with an ls...

Thanks for the note about the pivot distance being the critical one. Want part of the pivot? Or just as long as the measurements are between consistent points? Any issues with the height of the rack causing bumpsteer issues? 

 

And nc was my first thought,  but i couldn't find anyone doing/done on Google so i assumed it was something I am missing. 

amg_rx7 (Forum Supporter)
amg_rx7 (Forum Supporter) SuperDork
11/7/21 8:24 p.m.

In reply to Dusterbd13-michael :

It's pretty common to swap to the nc rack on engine swaps into the 8. Maybe google for RX8 engine swap to see the build threads on that. Or just head over to rx8club. 

Greg Voth
Greg Voth Dork
11/7/21 8:39 p.m.

E46 BMW racks are adapted in.  It's someone common with the LS RX8 swap people. 

TurnerX19
TurnerX19 UltraDork
11/7/21 8:40 p.m.

In reply to Dusterbd13-michael :

Rack height and pivot point spread are totally related. The rack must remain in the same vertical and horizontal location as well as the same overall pivot to pivot distance to match the original RX8 bump steer numbers.

Keith Tanner
Keith Tanner MegaDork
11/7/21 9:21 p.m.

You can move a rack, but you can't easily change the pivot to pivot distance :) You want it to be from the center of the joint, basically the point where it changes angle. It's about 24" on a lot of cars IIRC, but the NC is the easy button here. 

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