Custom Koni Coilovers
Fully assembled coilovers with your choice of spring rate, ready to bolt on and go. Featuring either Koni 8610 single adjustable inserts (rebound adjustable only), or 8611 double adjustable inserts (compression and rebound independently adjustable), plus Hyperco springs in your choice of spring rate, helper springs, roller-bearing front spring perches, adjustable front sway bar end links, and Wilhelm Raceworks Coilover Top Mounts. For the price, you will be hard-pressed to find a better suspension setup for your MR2.
IMPORTANT: I do not build these every day, and do not stock many of the parts. The coilover housings are typically built and powder coated to order. Typical build time is 6-8 weeks. Please specify in the comments section if you would like a spring rate other than the standard 400lb/in front, 550lb/in rear
Package deal: Add a suspension geometry kit to your coilover order and save $80!
Extreme Top Mount Option: This option tilts the strut further in at the top, improving camber curves, roll center location, and wheel clearance. Coilovers ordered with this option will include a normal length front knuckle bracket (not extended like my standard housings) with an offset upper hole to help remove what would otherwise be excessive negative camber. This option will require drilling a new hole in the chassis of your car to access the rebound adjuster! (A template for this is available). See my blog post on the subject for more details.
Custom built from the ground up with .083 wall DOM tube, laser cut brackets and tabs, TIG welded, and finished with black powder coat. Wilhelm Raceworks coilover housings are designed around the Koni Race line of strut inserts. They also feature an extended knuckle bracket on the front strut for increased tire clearance, and as an added bonus are ≈1lb per corner lighter than modified stock housings. Standard insert part numbers are shown below:
|Single Adjustable||Double Adjustable|
Front Sway Bar End Links
Coilovers typically require shorter front end links, and these are no exception. Made with nylon race rod ends and aluminum hex center sections, Wilhelm Raceworks end links are fully adjustable to eliminate sway bar preload and easily rebuildable should the rod ends wear out.
Roller Bearing Spring Perch
All Wilhelm Raceworks coilovers include a front upper spring perch with an integrated, sealed, angular contact roller bearing. This allows the steering action to be handled by a bearing intended for that rotary motion, just like the stock Toyota upper mounts. Steering feel is significantly improved, and maintenance is reduced compared to using "Torrington" thrust roller bearings under the springs.
Spring rates should be tailored to your intended use. Softer rates of course provide a better ride, assuming enough travel to avoid bottoming out on bumps. Stiffer rates reduce body roll, and allow for lower ride heights without bottoming out. For a street MR2 I would suggest rates in the range of 250 / 350lb/in (front/rear), up to about 350 / 450 , paired with your choice of sway bar(s). A front bar only might be sufficient, depending on your goals and preferences. For comparison purposes, those rates in kg/mm (k) are approximately equal to 4.5k / 6.25k, and 6.25k / 8k. For slightly softer ride the front rates can be reduced some relative to the rear rates, but more front sway bar stiffness will likely be required to balance the handling.
For a more track oriented (or track only) car, higher rates are appropriate. I have run as high as 550 / 700 (9.8k / 12.5k) on my car with a Whiteline front sway bar. This worked OK on a smooth track, but I had some trouble getting it properly damped for bumpier autocross courses. I have since dropped down to 400 / 550 (7.1k / 9.8k) and like that setup better even on the smoother track. It is also quite a bit more comfortable on the road.
More information on spring rates and their relationship to shock valving can be found on my shock dyno page. Please contact me if you wish to discuss spring rate choice for your application.