Koni Coilovers

Wilhelm Raceworks coilovers consist of your choice of Koni Race strut inserts inside custom built coilover housings.

Koni Race Coilover


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. As such, prices are subject to change based on price changes of dampers, springs, etc. Please contact me to confirm prices prior to ordering.  Typical build time is 3-4 weeks.

Custom Koni Coilovers
Spring rates Front / Rear


Supply your own Dampers

If you already have a set of  Koni Race dampers, scored a great deal on a used set, or simply or wish to buy your own and ship them to me (or have them shipped directly to me from the vendor), I can assemble and ship you a complete coilover. Includes all the parts listed above, minus the Koni insert.

$1550

Spring rates Front / Rear

Coilover Housings

Coilover Housings


Custom built from the ground up with .083 wall DOM tube, laser cut brackets and tabs, TIG welded, and finished with gloss 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  8610-1436  8611-1257
Rear  8610-1437  8611-1259

Koni Coilover Housings

Raw Rear Housing

Raw Front Housing


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.  Included with complete coilovers, and offered separately by popular request.  6-3/4" long.

$80 per pair.

Sway Bar Endlinks


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.

roller bearing perch


Spring Rates

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.