Good-Win Racing Mazda Performance Parts

Progress Technology MX5 Springs for Soft Top ND Miata

2016-2017

Miata MX5 2016-2017 · Suspension · Springs


Part Number: 61-1847

Application: 2016-2017

Reg. Price: $219.00

Sale Price: $195.00

Quantity:

Progress Technology MX5 Springs for Soft Top ND Miata
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The easiest way to lower your soft top MX5! If you have RF version see our springs for RF. These springs result in just about a 1" lower ride height than stock. Spring rates are about 20% stiffer than stock, not close to double like some other options so the result is a car with a great looking ride height that still has plenty of ground clearance for every day roads and a nice smooth ride similar to stock with better control of the body motion when turning and braking. All figures here for SOFT TOP version of MX5 Miata, not for RF version, we are developing new springs for the RF.

Detailed specs below:

Ride Height
Stock heights on our ND were 14.25 to 14.75. Lowered heights with these springs approximately 13.25 inches front, and generally a bit over 13.25+ inches rear (measured center of wheel up to fender lip). Your results will vary depending on which shock you use and the age of the shocks, as shock pressure declines over time the car will settle lower.

The engineering staff at Progress has decades of experience in the design and tuning of performance suspension systems, including CART/Indy Cars, IMSA, SCCA, NASA, and SCORE competitors. These MX5 springs reflect their ability to develop a successful blend of appearance, handling capability, and ride quality. Our team works with Progress on each Miata application spring, and with nearly a decade of working with Progress we know the result will show the quality and consistent performance that we feel raises the cornering joy level of the ND platform to a new level.

Spring Rate
STOCK spring rates are 156 front all models, 80 rear for most models (Club model gets 100 rear).
Progress Spring rates 185 Front, 115 rear.
These MX5 springs feature increased spring rates for upgraded handling capabilities. These springs are designed to work with OEM shocks and bumpstops but will benefit further from using high performance shocks such as Koni Sport shocks. Progress specifies only certified high-tensile SAE spring wire materials. Their MX5 springs are cold-wound on modern CNC coiling machines, then stress relieved, pre-set, and shot-peened for maximum durability.

-All spring kits are powdercoated metallic gray.
-Drop amount varies by 0.25" depending on shocks used.

BRIAN'S APPLICATION NOTES: These are a great choice for those who want to replace the soggy factory springs to take out some of the crazy factory body roll, and improve handling, without dropping the car a lot. Lean on them in the turns and you will find the car is flatter and faster because the tires stay flatter to the ground instead of rolling onto the sidewalls as happens with the soggy factory springs. For those who want MORE DROP than the the springs provide, combine these springs with our KONI SPORT shocks. For those who want the car even more flat in the turns, combine these with our Progress Sways.

Shown below on our own 2016 in combination with factory standard shocks and Progress Sways.

INSTALL NOTES: As with the NC, so it also important with similar ND to not lock down the bolts to the suspension after install while the car is suspended in the air with the suspension fully extended. Bounce it on the ground, then give it a drive around the block with the bolts just snug so you get it to settle before you torque everything ON THE GROUND. Many shops will NOT know to do this...SMART CUSTOMERS PRINT ALL THIS PAGE FOR THE INSTALLER! See details in our forum installation section from NC application, thread is titled: "Spring Installation, Mazda Workshop Manual Notes" and factory TSB notes below. Once you do it right, drive it 500 miles and then do it again (which usually results in another quarter inch or more of lowering)....and then do the alignment. ROCKY'S TIPS: Our head mechanic Rocky has his own method that seems to work even better than the factory TSB. Once he finishes install at each corner he jacks up just that corner with BOTH UPPER AND LOWER LINKs loose, so the full weight of the car is compressing just that corner, then he torques the bolts...and he finds car will still settle with 500 miles but usually only another 1/8th inch.

Below is NC service manual notes, but design with ND is so similar that same rules apply.

ALIGNMENT:

Alignment depends much on what you do with the car. Assuming no autocross or track use, for pure street driving my suggestion is:


Front Camber -1.2
Toe IN 1/32nd per side (some shops call this 1/16th 'total' toe in).
Caster 6


Rear Camber -1.2
Toe IN 1/32nd per side
Racers will take much more camber and zero toe all corners (and usually full coilovers instead of just these very mild street springs). Autocross customers will toe OUT the front, track users usually toe ZERO front and rear.

*** Product images may differ from actual product appearance ***

REVIEWS

As you can see, i placed another order for more parts for my car. I wanted you to know that I'm pleased at how quickly the wheels/tires came, and the radiator too. Great service and response time.

-- Jeff D.

Thanks for such speedy and great service.

-- Richard H.