Progress Technology Springs for Soft Top ND Miata and Fiat 124
2016-2024
PART NUMBER: 61-1847
DESCRIPTION
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 (see our RF springs as item 61-1847RF). Pictures below of Konig Ampliform 17x8 4X100 ET45 Dark Metallic Graphite and Our Progress Springs and SuperStreet Muffler Courtesy Ted7 - Automotive & Car Event Photography.
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. I recommend our SHORT BUMPSTOP KIT (item 61-3050 on this site) with these springs.
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 -1.8
Toe IN 1/32nd per side (some shops call this 1/16th 'total' toe in).
Caster 6.5
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.
Installation Video Fun:
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TEAM RECOMMENDATIONS
Customer Reviews
Progress Technology Springs for Soft Top ND Miata and Fiat 124
Wow! My car looks so much better, and actually handles a lot better too. I'm very happy with the Progress Springs. My only negative comment would be that I watched videos online about changing the springs, and I read the install guide on the Goodwin Racing site. What I didn't notice until the last spring, was the instructions included in the box. It said to cut the bump stops in half. Since I hadn't heard this before, I completed the install and tried it with the full bump stop. It hit all the time. The next day after the initial install, I took the springs off, cut the bumper in half and re-installed them. Now... I love it! My car is quiet like stock, the ride is almost as comfortable as stock, but it handles noticeably better, and certainly looks much better!
Really excellent product, a great addition for those not looking to go more aggressive with sway bars. These alone cut probably 70% of the body roll out and are paired very well with the factory Bilsteins on my 2022 ND Club. Ride quality maintained and maybe even better on ordinary roads, only gets a little jittery on the worst roads here in Louisiana. Noticed a little bit of the fire-aft bouncing with factory springs on uneven roads that some folks talk about, not a huge amount overall, but reduced a bit with these springs. Hate to use the "this is how it should've come from the factory" tripe that is a common comment with MX5 mods, but it's the truth here. Didn't measure prior to installation, so can't comment exactly how much it lowered, but I'd say an inch is fair. Looks MUCH better, and no scraping, even in parking garages. Can't recommend them enough.
Paired with the Progress Tech sway bars, my 2016 ND Club Sport (Bilsteins, no Brembos) came ALIVE on the street and at the track. Easy install. Recommended video helped get the details right. A fun 'upgrade' project with tons of payback. Well done GWR and Progress Tech; excellent.
Installed these springs today. Install was very straightforward and took about two hours to do all four in my garage.
Initial impressions after driving about an hour with them:
1) Ride height looks awesome. As others have stated, not too low, but definitely lowers the car enough to enhance the appearance.
2) I'm incredibly impressed at the ride quality on these springs with the Club Bilsteins. I would almost go as far to say that it's nearly the same as the stock spring ride.
3) The car definitely feels more "sure-footed" and flat in the corners. Took a spirited drive on some twisty back roads to check them out and was not disappointed.
I look forward to pairing these with the Progress swaybars in the next few days and trying them out on a local track or on a fun road like US129.
All in all, definitely not as low as some coilover options out there when installed on the Club Bilsteins, but certainly gives the car a better stance and appearance. In terms of performance, a solid improvement over the stock spring setup in terms of handling and eliminating some of the body roll we all dread in these cars. A great street application mod.
These springs lower it to the perfect height for a car you still want to drive on the street. I can go over speed bumps and hills without scraping and the ride isn't too stiff. It dropped about an inch and they are good with the bilsteins. I didn't want to change the ride too much from stock and there is a small noticeable difference but it's not bad and rolls a bit less.
Great springs! I was thinking about buying Eibach ProKit since I've used them before but after comparing the spring rate and drop I would get I decided to try this Progress springs for my soft top NDII and I am very pleased (I didn't like that Eibach ProKit European part number stated a different drop height than the US part number).
I love the way the car looks and for a city like Mexico City where there's a lot of pot holes and bumps I think the car height is perfect. It feels even better than with the OE springs. The springs are installed with the OE shocks (no bilstein) and original tires (Bridgestone Potenza 205/45R17)
I took the car to a track and was also very pleased with the car behavior. It improved a lot. It is definitely not the stiffest car to take to a track but for a combined use (street mostly and track eventually) I think it is great. Driving on the highway and really pushing the car to its limits (cornering at around 100MPH), I was amazed how great it feels. It no longer gives you that sense of floating through the corners. Definitely a good alignment is also a great upgrade. For now, Im using the Good-win racing alignment suggestion which is more street driving focused. For the next trackday, I will increase the camber to -1.5 front and rear and see how it goes.
I strongly recommend installing the springs as advised. Follow the instructions. Torque everything with the car on the floor. It is important to bounce the car and take it for a ride around the block before you torque everything down. It really works.
After about 400 miles, I loosen the bolts and re-torque them and the car dropped a little bit more.
Since I was changing the springs, I decided to change the bump stops as well. I can't tell the difference but I think that if you are putting the suspension apart, it is a good idea to get everything done at once.
I'm totally satisfied with this springs!
Very pleased with the spring, dropped the car just enough to look good and the ride is excellent for me. I did an HPDE so far and it went very well. I have 245/40/17 all around and no rubbing.
I also got the assorted swaybars front and rear which help a lot!
Pierre
I installed these on my MX-5 with 600 miles on it. In short, the height and ride is exactly what I had hoped for. I retained the stock Bilsteins dampers and they seem to work very well with them. I've owned an NB, NC and now this ND. I have changed the suspension on each one of them so I'm no stranger at dialing in the desired handling characteristics. As another review stated, I have no intent in taking this car to the track or autocross it. This is a car that just puts a smile on my face! I'm am very happy with these springs and would recommend them to anyone who is looking for a lower height and improved handling.
After the installation, I re-measured the gaps, the gaps were reduced about 1.25" to 1.3". The car no longer looked like a SUV. The vehicle remained very comfortable driving over bumps and potholes with stock wheels and tires. The vehicle does not feel floaty during cornering, and feels more planted on the ground. I did not plan on take this vehicle to the track. If you do plan to track or AutoX your Miata, I'd say go with either higher rate springs or a set of coilovers. Overall, I am very satisfied with the springs with its performance vs price.
Springs arrived quickly and in perfect condition. Installation was a breeze. Important tip! Follow Rocky's instructions for jacking up each corner before tightening everyhting down. Drop looks perfect and there is significantly less body roll. Ride is still smooth, not harsh. One of my favorite mods. Thanks Good-Win!!!!
Love these springs. Perfect for my use. My car is a street fun machine that will never likely see a day on the track. It reduced lean nicely but the ride feels unchanged on normal driving. The ride hieght is lower by not drastically lower which makes it great for the street, speed bumps etc., while making it look a little more aggressive. I also added 215/45/17 tires and 3mm spacers at the same time and it looks great in my opinion.
If you are going to make some changes then the suspension is a great place to start and this spring mod is transforming both to the appearance by lowering the car to a more pleasing aesthetic and providing better aerodynamics. The ride quality while significantly firmer is not unpleasant even when driving for hours. There is also a significant improvement to the overall handling making the car feel more responsive and planted. Overall these springs deliver on the promise and then some.
Peter - FL 11/2019
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