1990 Suspension Spring Rates
My 1990 Turbo Miata came to me with the following suspension setup:
Ground Control/Bilstein coil overs with front 375# springs (part number GC150.64.66) and rear 250# springs (Part Number GC180.64.44). Flyin Miata Frog Arms Bad Dog Bolt in Rollbar Cusco Strut bar. The car is really harsh up front on fairly trivial bumps. I'm surious what others are running for spring rates because it just seems like the fronts are way to harsh compared to the rears. Mike |
It has nothing to do with the springs (which are actually considered soft for a Miata) and everything to do with the shocks. If you want good ride quality, you have to spend $$$.
With today's shock tech, you can legitimately daily drive a car with 700/400lb springs. |
Originally Posted by Mikelly
(Post 960944)
My 1990 Turbo Miata came to me with the following suspension setup:
Ground Control/Bilstein coil overs with front 375# springs (part number GC150.64.66) and rear 250# springs (Part Number GC180.64.44). Flyin Miata Frog Arms Bad Dog Bolt in Rollbar Cusco Strut bar. The car is really harsh up front on fairly trivial bumps. I'm surious what others are running for spring rates because it just seems like the fronts are way to harsh compared to the rears. Mike Edit: lulz at Andrew posting the exact same answer at the exact same minute.. |
Originally Posted by Savington
(Post 960947)
It has nothing to do with the springs (which are actually considered soft for a Miata)
375 / 250 is a pretty good springrate for a comfy daily-driver, but there are many more variables. Shocks are one. Expensive shocks work better with stiff springs, there's no avoiding it. FatCat Bilsteins, Xida, Tein, even Koni Sports would be passable choices. Many of these will come with their own springs. Ride height is a huge factor. Miatas don't have a lot of suspension travel, and if the car is substantially lowered, the distance between the top of the shock and the upper shock mount is reduced even further. If the car is lowered more than 2" or so, you're probably riding on the bumpstops, and the hardest spring is a hell of a lot softer than a compressed bumpmstop. And that's another area that can be massively improved. The stock bumpstops on the NA are pretty hard, and too thick. You can install NB-style upper mounts and MCU bumpstops to gain both additional suspension travel and a more gradual transition when you do bottom out. Three major companies to deal with here: Automotive Suspension Experts | Fat Cat Motorsports | FCM Elite shock absorbers 949 Racing - 6UL 6ULR wheels - Miata performance Flyin' Miata : Chassis : Suspension components FatCat is geared towards the street and AutoX crowd. 949 is all about "real" track racing. |
Originally Posted by emilio700
(Post 960948)
Edit: lulz at Andrew posting the exact same answer at the exact same minute.. |
Mike if you think/thought your setup is/was harsh, you should have felt mine with konis with any rate spring.
I'll let you drive mine with tien flexes if you want. |
Dude you've seen and been in it. MIght well be the bumpstops/mounts. That's something I forgot that I replaced when I built the Specmiata. I'll try that first.
You going to be around next week? I might drive the GT3 in a few days next week, and I could swing by and let you drive it, and check your Miata out. Mike
Originally Posted by Braineack
(Post 961246)
Mike if you think/thought your setup is/was harsh, you should have felt mine with konis with any rate spring.
I'll let you drive mine with tien flexes if you want. |
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