949 Racing
XIDA Coilovers
 90-05 MX5 Miata

New Club Sport version for under $1900!

Xida Club Sport
XIDA

Working with AST, we have made a few dimensional changes to our sought after XIDA race
coilovers to make them cross compatible with inexpensive OEM 99-05 Mazda Miata upper
mount hardware. So you can now purchase a XIDA kit with no mounts, OEM mounts or our
proprietary extended spherical bearing billet aluminum mounts.

This change and increased manufacturing volume have allowed us to slash $1000 from
the cost of getting into the XIDA system. The Xida CS and S are the exact same damper,
just different upper mounts.

If you are not already familiar with our XIDA system: They are based on the top of the line
AST 5200 series, designed from scratch by 949 Racing and the team at AST-USA for the
Miata and purpose built for competition at the highest level. Over two years in development,
tested and honed on tracks and autocross courses in many cars. Optimized dimensions to
allow either near stock ride height for a daily driver or lowest possible ride heights for race
only use. In our first year, racers were immediately winning races, setting lap records and
TTOD's all over the world in everything from fire breathing 400whp Rotrex Time Attack cars
on 10" slicks to 115whp STS autocrosser's on 7" street tires. So how can a purpose built
race coilover such exceptional ride qualities? Precision. By elimination virtually all of the
friction, weight, hysteresis and insensitivity built into common entry level or steel OEM
replacement dampers, the AST built Xida can offer damping force rates required for
1.5G cornering in a 2450lb Miata and still have the suppleness and adjustment range
to work with soft spring rates and rough public roads. This is also made easier by the
Miata's overall lightweight and inherent light unsprung masses (wheels and suspension).

Visit the website for pricing on the many different options available.
HPDE Trackday Autocross Street
CSP - STS - STR - SSM - XP - EM - ITA - NASA PT - SuperMiata

XIDA
  • Double adjustable - Separate rebound and compression
  • Spherical bearing, billet aluminum mounts
  • Coaxial "floating" upper spring perches
  • Aluminum alloy bodies
  • Monotube
  • Remote reservoir - User adjustable pressure
  • Spherical bearing mounts
  • Torrington thrust bearing for lower spring perches
  • Stroke- 120mm front/110mm rear
  • 2.25" Hyperco springs
  • 2.25" helpers
  • HDPE spring couplers
  • Weight- 8.3 lbs front, 7 lbs rear
  • click for more info
XIDA-S
  • Single adjustable - Rebound and compression together
  • Spherical bearing, billet aluminum mounts
  • Coaxial "floating" upper spring perches
  • Aluminum alloy bodies
  • Monotube
  • Spherical bearing mounts
  • Billet aluminum extended rear mounts
  • Coaxial "floating" upper spring perches
  • Torrington thrust bearing for lower spring perches
  • Stroke- 115mm front/105mm rear
  • 2.25" Hyperco springs
  • 2.25" helpers
  • HDPE spring couplers
  • Weight- 7.4 lbs front, 6.2 lbs rear
  • click for more info
XIDA-CS Club Sport
  • Single adjustable - Rebound and compression together
  • Aluminum alloy bodies
  • Monotube
  • Stroke- 115mm front/105mm rear
  • 2.25" Hyperco springs
  • Weight- 7.4 lbs front, 6.2 lbs rear
  • click for more info
Which options do I need?
If you want the Club Sports and do not have a set of 99-05 Miata upper shock mounts/
hardware, you can add the Mazda mounts in when you order from our site. If you already
have OEM 99-05 Miata uper mounts, just order the CS's plain. You can run the optional
dual spring set up with both our custom alloy mounts or the OEM mounts.

If you want the Club Sports with optional alloy mounts and dual spring set up, that is the
Xida-S so just order from the Xida-S page to simplify.

Upgrades
Since the XIDA line all use the exact same damper, you can mix and match components to
upgrade your system at anytime. Perhaps start with the Club Sport's and stock NB mounts,
later add spherical bearing upper mounts then maybe convert to double adjustables.

Why dual springs?
The dual springs allow the long stroke XIDA damper to fully extend with high rate racing
springs. This extension allows the damper to spread the impact load over unweighted drops
for a smoother transition. Think "WRC car on bad pavement". The dual spring will also allow
the factory Torsen diff to function properly under a wider range of conditions. Getting
Torsen wheel spin with your stiff single spring set up now? We'll fix that! For these reasons,
we recommend always setting up the XIDA's with dual springs. For road courses, rough back
roads or really rough autocross lots, they are a must. For smooth roads, lower grip tires or
smoother autocross lots, you can delete the dual springs to save $200 but we'll still think
you'll be happier with them.

Why Spherical Bearings and Coaxial Perches?
The spherical bearing mount forces the valving to keep the contact patch loaded optimally.
With any rubber in the system (OEM mount) or even harder MCU (Micro Cellular Urethane),
you have some hysteresis or undamped movement. It's a very small amount of undamped
movement to be sure, but every bit matters. The other factor is friction, the combination
of coaxial perch, spherical bearing and Torrington Bearing does a great job of isolating
suspension induced thrust and bending loads from the damper. This allows the damper to
do be valved more sensitively and do a better job of maintaining consistent contact patch
loading.

Choosing spring rates
Standard spring rates are 700/400 with 150 in/lb helpers. Custom spring rates available.
Standard valving is optimized for all DOT radials, either EHP/UHP like RE-11 or R compound like
A6, NT01.
Valving range will cope with front springs from 450~900 in/lbs and rears 250~550.
Optimzed for unladen (no fuel/driver) vehicle weights between 1950-2350 lbs. No need to
revalve if you switch springs, tires or sway bars when dialing in the car. If you think your
car might fall outside these windows, give us a call. Custom valving available at no cost
but only very rarely is it even needed.

Set up with softer 450/300 springs the XIDA-S make the ultimate smooth riding performance
street set up. Better ride than factory shocks on rough roads plus fantastic control for the
occasional casual autocross or trackday.

Still not sure what you need? Give us a call or email. We'll get you dialed!

Suspension packages
We also offer all the stuff you need to build a complete suspension package
Sway bars
End Links
Suspension Bushings
Chassis Braces
Lightweight wheels
Racing Limited Slip Differentials

Warranty
AST dampers have a non-transferrable lifetime warranty for materials or workmanship
defects. You read that right, a racing part with a lifetime warranty. See our website for
complete information about the warranty policy. Serviceable, rebuildable and tuneable by
AST-USA.
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