https://www.keislerautomation.com/rx...-arm-pre-order

Was talking to an acquaintance of mine at the race this weekend. He is looking into getting these manufactured for the FD. Hopefully by Keisler iirc. Thought I'd post up here to judge community interest. Minimum order size is 20. Price will probably be similar to the RX8 part at $625 each.

Post up if interested. Thanks.


Copy/pasta of the product description is below but this will work with the stock upright / spindle: Seamless camber adjustment- Simply loosen two fasteners and install alignment shims. With no shims, expect an additional 2 degrees of negative camber. One 1mm shim and three 2mm shims are included. Each mm added is .25 degrees. This allows quick adjustment without the need to measure camber before and after. This is the most effective adjustment design for speedy trackside adjustments. This adjustment lends itself to DIY alignment setups for a car on the ground with turn plates and hub mounts. With this adjustment, you can lockout the factory lower control arm eccentrics which can be problematic.

Serviceable ball joint- Unlike the factory arm, the spherical bearing at the "ball joint" location is easily serviceable

Spherical joints throughout- Eliminate the OEM compliance bushings with the use of heim joints for a major reduction in deflection. This keeps dynamic wheel alignment at a much smaller operational window. The heim joints are also easily serviceable.

Caster adjustment- Although the caster adjustment isn't as quick and easy as the camber adjustment, it still allows the OEM caster eccentric to be locked out. Adjust one heim joint inward and the other joint outward the same amount of turns to position the ball joint forward and rearward without affecting camber.

Brake line pickup- Unlike most aftermarket control arms, these allow the OEM attachment of the brake lines. No questionable zip ties

Stiffness- The arms have over 50 hours of crafting in FEA which produced 114% decreased displacement given the same load under braking. OEM- .015" deflection @ 1288lbf vs. ours @ .007" deflection @ 1288lbf. This helps aid in keeping the wheels where they need to be.

Strength- Considering geometry alone, our version displays a 46% reduction in stress given the same load under braking- OEM 18,200psi @ 1288lbf vs. ours at 9,900psi @ 1288lbf. When considering our material selection of 2024-t3 aerospace aluminum, this equates to a total added fatigue resistance, geometric and chemical combined, of 135% over the OEM A356-t6 die cast arms.

Weight- Bird bones are hollow so why can't our parts be? Properly designed bolted connections add significant weight compared to a solid design. Taking this into consideration along with how effective the OEM control arm is in terms of strength to weight, it was time to get creative. Given the geometrical constraints, the "legs" of the arms have a bending moment induced where, in a perfect world, the legs would be loaded solely in tension and compression. When bending loads are induced, moving mass to the outer edges and in the path of stress is critical. By removing material from the center of the arms through countless FEA analysis, we were able to achieve a complete assembly weight of 2.4 lbs compared to OEM at 2.5 lbs.

What are your thoughts?
Tagging some track guys
@BlueTII @Fritz Flynn @tomsn16 @Valkyrie @Billj747 @ArmenMAxx
@ptrhahn @R-R-Rx7 @dguy @diyman25 ​​​​​​​

 

Neat. Is that the pair price, or single?

 

Pretty cool. But, I'm not sure I want to run spherical bearings there.

 

That's a high-end Motorsports style control arm design with that camber adjustment. I think it looks great.

 

Single. Not cheap.

 

Would be pretty cool if he made some threaded ends that would take a stock style bushing.

 

That's really neat! I would be interested.

 

that's a nice setup but i don't think i would be going for it ! Good luck, i hope it works out !

 

Another option, if you wanted adjustable arms https://racefab.co.nz/RX7.html . It definitely won't be as quick as machining out of plate, the exchange rate, if the tariff craze is finally worked out, may make the cost a lot more palatable.

 

Curious about something a friend pointed out when I shared this with him - on the Keisler page for the RX8 arms, the text at the bottom of the page says:

I did notice you mention in your original post that they will be compatible with the stock spindle but calling attention to this apparent contradiction. Or am I misinterpreting this text and it's actually saying that the drop spindle won't be usable without also having the upper control arms?

 

I tried to get him to make a drop spindle a decade ago, offering to pay the dev costs.

 

Years ago, I bought the Nagisa (not sure on spelling) front UCAs from RHDJapan. Mine are chromolly with the heim rod end joints and serviceable ball joint studs. I've recently re-booted my OEM UCA ball joints, and plan to reinstall those. Here's why.
The Nagisa arms I bought make contact with my wheels at full lock, which happens with my stock wheels as well as my track Fikse wheels. No bueno. They also do not have provisions for the wheel speed sensor wires, so I have those attached with zip ties. Heim rod end joints are fancy, but they wear quicker as the joints are not covered and are more exposed to road conditions. Finally, and most importantly, my local shop that setup my suspension explained to me how little the UCAs contribute to camber against how much the LCAs do.
These UCAs are fancy, but the OE with some poly bushings would out-perfom and maybe even outlast stuff like this.