Re: Now here's a gauge pack
I emailed Praxis a couple months ago and just got an email today on the update...MSRP $3695, available August 1, 2003. Here's the email:
It has been quite a while since the last Praxis product update. Over the
past two months, our team has been extremely busy finalizing the engineering and production details of the Subaru WRX system. We have also been preparing for a media event and product introduction at Willow Springs Raceway. This event will introduce the editors of many popular enthusiast publications to the Praxis system and will allow them to experience the product on both public highways and the race-track environment. Expect to see independent reviews published in two to three months.
Our web site (www.praxissystems.com
<http://www.praxissystems.com>) will be updated shortly to reflect the technical specifications of the final product. Until that occurs, I have included a FAQ list to address common questions.
Q: What does the Praxis system do?
A: Praxis allows the driver to select the height, spring-rate and damping
for whatever driving adventure lies ahead. There are no coil-springs to
change and no spanners to carry, because the spring-rate and ride-height is controlled by air. It's as easy as touching a button and turning a knob.
Select one of three programmed ride-heights and spring-rate levels with a
simple push of a cockpit mounted button. Then adjust damping by turning the adjuster conveniently located on each strut-unit. Touring mode, Sport mode or Track mode ... you control the level of performance.
Touring mode: Touring mode provides ride and handling comparable to the factory delivered vehicle. Original ride-height, spring-rate and damping produce a balance that is perfect for daily commutes or highway touring.
Sport mode text: Sport mode dramatically steps up handling responsiveness. Ride-height is lowered one inch. Spring-rate and damping are increased to reduce body motion and sharpen steering response. The vehicle is now ready for your favorite canyon road or an enthusiastic jaunt to work.
Track mode: The ultimate performance setting, Track mode lowers the vehicle two inches, doubles spring-rate, and provides the firmest damping of all. A no-nonsense, no-compromise setup for the most aggressive autocross and track driving situations. This setting is not recommended for street driving or for the faint of heart.
Q: What is included in the Praxis system?
A: The Praxis system includes all components necessary to convert your
vehicle. The system has been designed to be application specific in order
to ensure proper fitment and avoid performance and installation issues often encountered with "generic" aftermarket products. Praxis products are properly packaged to avoid damage during shipping and include a
comprehensive set of instructions to ease installation. A comprehensive
list of system components is provided below:
· Externally adjustable, inverted-monotube struts (4)- co-developed and
manufactured by H&R
· Multi-Rate air springs (4)
· Air compressor
· Air dryer
· Trunk mounted, auxiliary air reservoir
· Valve block
· Multi-axis accelerometer
· Height sensors (4)
· Wiring harness (pre-assembled with fuses and relays)
· Cockpit control module
· Brackets for air reservoir, compressor, ECU, valve block, and height
· Air plumbing
· Installation hardware
· Detailed instructions
Q: How does the Praxis system differ from other aftermarket suspensions for the Subaru WRX?
A: The aftermarket offers many opportunities for the performance enthusiast. There are many existing coil-over products that enhance the track performance of the Subaru WRX. Unfortunately, a properly tuned motorsports suspension is a poor choice for a road-going vehicle. Day-to-day usability demands a suspension that can absorb road inputs encountered on typical public highways (pot-holes, cracks, speed-bumps, etc.) and it is in these everyday situations where the existing aftermarket products suffer. Praxis has created a new product category, the advanced suspension, which allows the user to enjoy a compliant suspension in everyday use AND a properly tuned motorsports suspension when the situation demands.
Q: Does raising and lowering the vehicle affect wheel alignment?
A: It is well known that toe and camber change as ride height is altered.
Our alignment specification (different than the factory specification) will
allow daily use of touring and sport modes without affecting tire wear.
When the car enters the track mode, the camber becomes more aggressive (negative) ... this is good for lap times and will not produce undesirable wear considering the race-circuit environment. Randomly choosing an aggressive camber angle without regard for toe setting or other suspension characteristics usually results in rapid and irregular tire wear. Bridgestone technology has enabled us to use state-of-the-art methods of predicting tire wear to optimize the alignment setting to balance both handling and tread life. You will not have to realign the car when you change ride heights. You will need a one-time alignment when the system is installed.
Q: Why does the Praxis system include an accelerometer?
A: Since the Praxis system was designed specifically with the performance
enthusiast in mind, it was necessary to produce a product that performed
flawlessly on a racing circuit. The accelerometer serves this function by
providing the ECU with information about how hard the vehicle is being
driven. In turn, the ECU can make informed decisions about when to add or remove air from an individual spring. The presence of the accelerometer avoids allows the ECU to intelligently decide whether a suspension motion is originating from forces that demand air movement (i.e. adding cargo or changing operating modes) or from forces that do not warrant movement (i.e. high-g cornering or skid-pad testing).
Q: How can the Praxis system automatically corner-weight the vehicle?
A: Because the Praxis ECU and valve-block can control airflow to, from, and between the air-springs mounted at individual wheel-positions, we have been able to develop a control sequence that automatically re-distributes air between springs during a height-change. This re-distribution results in balanced diagonal weights, and a car that handles symmetrically in right and left turns.
Q: How much does the system weigh?
A: The system adds approximately 30 pounds to the weight of the vehicle.
The increased weight comes mostly from the air-supply system (compressor, air tank, valve-block assembly) and is equally distributed between the front and rear of the vehicle.
Q: How long will it take to install the system?
A: Installation of the Praxis system is somewhat more complex than the
typical strut installation because of the air-line plumbing and electrical
wiring that must be routed through the interior of the vehicle. We have
simplified the installation by providing fully assembled strut units that
can simply be bolted in place and a wiring harness that is fully
pre-assembled. All brackets are application specific, so no fitting,
adjusting, drilling, welding or soldering is necessary. Fully detailed
instructions will guide a moderately accomplished amateur through the
installation process in eight to ten hours. No special tools are required,
but the vehicle will require a suspension alignment after the installation
is complete. The Praxis warranty will be valid whether the system is
user-installed or professionally installed.
Q: What is the Praxis warranty?
A: We will warrant the air-strut units (springs, struts, mounts) for
2-years. All remaining components are warranted for one year. Best of all, we will warranty the system for sanctioned, amateur motorsports applications (autocross, Solo-I, Solo-II, rallycross, lapping days, drivers schools, drag-racing) ... this is an industry first.
Q: How much does the Praxis system cost?
A: The Praxis system for the Subaru WRX has an MSRP* of $3,695. *MSRP = Manufacturer's Suggested Retail Price
Q: When can I purchase the Praxis system?
A: The WRX application will be available for public purchase Aug 1, 2003.
Q: Where can I purchase the Praxis system?
A: The Praxis system will be available for retail purchase at The Tire Rack
Q: What applications will the system fit?
A: We are introducing the product on the WRX platform. This application
will fit model year 2002+ Subaru Impreza 2.5RS, WRX, WRX-STi sedans and wagons. We will add applications as our engineering resources allow. In the near term we will focus on Sport-Compact and Sport-Sedan platforms that have high aftermarket interest. It is our intent to add two additional applications in early 2004.
Thank-you for your continued interest,
William S. Niaura
PRAXIS Advanced Suspensions
Manager - Marketing & Technology Coordination
1200 Firestone Parkway
Akron, OH 44317