PART NUMBER: 61-2074
Want the easy button for maximum FUN? Look no further than our RoadsterSport Suspension Package for the 2016+ Mazda MX-5 (and 2017+ Fiat 124 Spider that is built in Japan by Mazda on the same Miata chassis).
What's included with the package:
1 x RoadsterSport Spring Set (300lbs F / 200lbs R)
2 x Koni Sport FRONT Shock - NEW adjustable height version
2 x Koni Sport REAR Shock - NEW adjustable height version
1 x Sport Bumpstop Kit (36mm Front / 58mm Rear)
Good-Win Racing Application Notes:
Our new favorite for around town fun that can still hit the canyons or autocross/track on the weekends. The RoadsterSport springs have the perfect amount of spring rate to make the car much more flat in the turns without causing a harsh ride day to day. These are also a great choice for those who want to replace the soggy factory springs without dropping the car too low.
Want more? The included Koni Sport Shocks are rebound adjustable which let you take the ride from soft to stiff with the turn of a dial. If you are headed to the autocross, crank up the dial, and lean on them in the turns and you will find the car is MUCH flatter and faster through the curves. When you are ready to head home, simply adjust the shocks down and drive home in comfort.
NEW adjustable height Koni shocks includes multiple perch positions to achieve different ride heights. With the previous fixed height version of these shocks combined with these Progress springs the ride heights came to approximately 13.25", as shown below. To replicate this height with the new shocks, use perch position 2nd slot from top on the front and third down from top at the rear.
UNBOXING NOTES: These springs are manufactured to our specifications by Progress, the same makers as our standard Progress springs and RF springs, so don't be alarmed when a box of springs that say Progress arrives. Verify the part number on the box is correct for RoadsterSport springs: 40.1135.
Take a ride with Brian Goodwin in our Fiat 124 Spider while he steals Top Time of the Day at our local BMCCA Autocross using our RoadsterSport suspension package.
Want more? Here is a first person lap with our Sean Thomson behind the wheel of our Fiat 124 project car.
INSTALL NOTE: Shock Rod is 12mm, stock bump-stop washer is 10mm, so you need to drill out the factory bump-stop washers slightly for install.
Overall, I was very pleased with the ease of installation and how much handling improved with the Koni Sport shocks and upgraded bump stops. They're well worth the upgrade!
Starting from a GT trim level with soft, non-Bilstein shocks these Konis make a HUGE difference in helping remove unwanted body roll. Also, for Autocross they are a must because in C Street class with only one sway bar upgrade allowed, adding adjustable Konis lets you balance the car and tune the handling depending on your preference for oversteer vs understeer.
I can't speak to how the lowering springs performed because I had to leave stock springs on to stay in CS class for AutoX, but the Koni shocks were definitely a game changer! I took 1st pax time in Novice, 2nd fastest raw time in CS, and beat all of our region's STR prepped Miatas raw times too after I added these Koni shocks. They might not be coil-overs, but they can put up a good fight.
Thank you Brian for the setup notes! As Brian mentions, for people who autocross, you'll want to purchase bump stops separately from Good-win (or at least add different front bump stops). You'll want the red medium stiff in the front and blue full stiffness stops in the back.
As a novice level mechanic, the install of both shocks and springs is simple, straightforward and only required purchasing spring compressors and following tutorials online. Definitely something anyone could do with enough patience. Easier than swapping out the front sway bar!
This was my 4th suspension swap on a Miata but my first shock swap (vs coil overs). The job took me about 6 hours without an alignment. Only significant glitch was that I could not get the top nut on either rear strut started even with max spring compression. I cut down a couple of NC top bushings by about a 1/4 inch and made it work. Using Goodwin's recommendations for ride height, the car's posture is perfect post install; slight forward rake, about one finger gap between tire and fender in the front. Out of curiosity, I checked corner balance. LF/RR only off by about 70 lbs with my 200 lb butt in the seat. Aligned the car after about 100 miles. Easily achieved 8 degrees caster. I set camber to -1.0 all around but had well over -2 degrees available on all 4 wheels. I am still playing with damping; Goodwin's 3/4 turn damper setting seems like a good compromise. Overall, excellent bang for the buck.
Received quickly. Roughly 2-hour install on jack stands (my car only had 500 miles on the clock - so bolts are fresh). I followed the normal install, but used a jack to fully compress suspension to torque bolts (Randy's suggestion?). The Koni's have adjustable perches, so I followed GWR's recommendation and set at 1 perch below how they ship on fronts and 2 perches below on rears.
Measured at center of wheel from ground to bottom of fender lip (after 100 miles):
The good: love it, no-brainer upgrade, at 3/4 turn past full soft, ride is very similar to Club Bilsteins, springs drop the car and transform how this car behaves and drastically improves the appearance of the car. Brake dive is substantially better and transitions much more confidently. (Have not installed Progress bars yet) This is the route I've taken with all 4 generations of Miatas - don't see the need to spend the extra $ on coilovers for how I use the car. Love the fact that the new Konis have multiple perch points, allowing a lot more flexibility (again - diminishes need for coilovers).
The bad: none.
PS. Don't freak out when you first install them if the ride height varies from corner to corner. Every install I've done in the past results in (typically) the right rear being 1-1.5" higher than the left rear, but quickly settles down with a few miles and will get within .25-.5" of the left.
This setup works fantastically for me. I wanted to get rid of the sloppy stock suspension and have it lowered some. Now it is lowered about 1", which got rid of the fender gap. Looks so much better now. I also wanted to put on the 235/40/17 tires and not rub (I don't) and I didn't want to worry about bottoming out (I don't).
I also just started SCCA auto crossing and they work perfectly for me. I turn the front Koni's up a turn toward firm and go. This is my wife's daily driver, so I keep the Koni's on full soft. I haven't had any complaints on the ride being too harsh.
I would recommend this setup to anyone who wants to have fun on those tight turns but also drive the MX-5 and not get beat to death and need to wear a kidney brace.