WARNING:

THIS PRODUCT WILL CREATE MINIMUM ET'S AND

  EXERT MAXIMUM "G" FORCES TO OCCUPANT & VEHICLE

7 out of 10 NHRA 2010 World Champions Ran On

Calvert Suspension

Track Tested to 1500 HP

As every Drag Racer knows, consistency wins championships. John Calvert has achieved championship status in the highly competitive field of NHRA drag racing. He has 20 plus years of racing experience over every type of track condition imaginable. John has won most of his races in a 1968 Ford 428 cu/in powered Cobra Jet Mustang. He knows the idiosyncrasies and potentials of his car without question; He knows the importance of understanding and fine tuning all the components needed for repeated successful performance. His experience and success over the years with his car provide him with an excellent base line from which to create more efficient modifications. It has in this experimental role that John and his skilled friend Larry Kieser developed the CALTRACS traction enhancement system.

In Stock Class, where John's major racing endeavor has been shaped, NHRA dictates that a maximum of 9" slicks can be used. This presents a racing dilemma to a driver when trying to couple big block power to the ground. The CALTRACS design was developed in John's garage. Brainstorming together, Larry and John created the design and the first model of the system. CALTRACS augments the car and driver potential to specific performance goals while complying with hard set NHRA class parameters.
John's concept won the enthusiastic approval of his family. Two brothers, Keith and Paul and Dad, Bernerd all share a talent and fascination for the world of mechanical engineering. Combined they hold over 75 years of career involvement in Aerospace engineering and production.

      You think Caltrac suspension is just another voodoo story?  Here you go !

PUT ON YOUR ANTI "G" FORCE FLIGHT SUIT

THIS SYSTEM WILL HOOK YOU UP!

Caltrac "mono-leaf split" springs

Equipped on 6 of the last 7 World Champions in Stock Elliminator. Calvert Racing’s Split Mono-Leafs are used by drag race enthusiast across the nation, that demand nothing but the best performance!

Calvert Racing’s Split Mono-Leafs are available for most cars and light weight trucks. Most springs are in stock and typically ship out by the following day. Call us now for your application!

• Complete with aluminum bushings in front eyes, & urethane bushings in rear eyes.
  
• Split Mono-Leafs made to work in conjunction with CalTracs.
  
• 200lb. - 225lb. spring rates available.
  
• Various ride height options.
  
• Substantially lighter than multileaf springs for unsprung weight savings.
  
• Heavy duty alignment spring clamps

Price : 380 €

Caltrac traction bars

Specializing in leafspring traction enhancement systems for over 15 years, the Calvert Racing Team knows what it takes to get your car hooking harder than ever!
  With unsurpassed quality and craftsmanship, all competition is eliminated. Why settle for anything less than the original system that set the standards?

Calvert Racing’s CalTracs are the most innovative traction bar units today, often imitated, but never duplicated.
  If you have a leafspring car, we have a set of bars for you! From daily driven cars, to 8-second outlaw cars, this system is made to out perform!

• Complete bolt-on, no cutting, welding, or modifications to OEM suspension.
  
• Keeps axle from rotating, helping maintain pinion angle.
  
• Improves 60ft times.
  
• Full preload adjustability.
  
• Eliminates spring wrap-up.
  
• Powdercoated gloss black finish.
  
• Full color Installation Guide.
  
• PSCA, NMCA, NHRA approved.

Price : 600 €

Ranco RS9000X rear shocks

• 9 way adjustable.
  
• External dial for easy adjustability.
  
• Dial primarily adjusts rebound, enabling driver to control excessive rear body separation.
  
• Heavy duty industrial steel bodied design.
  
• Cost effective.

Price : 225 €

Calvert 90/10 front shocks

• Cost effective

• Light weight design

• Lightning quick separation

• Available for Ford, Chevy, & Chrysler

Price : 125 € pair

The combination of these components changes the pushing point on the car by redirecting the turning action (spring wrap-up) of the rear axle through the Force Transfer Link into the Front Pivot. The Front Pivot Spring Stop Bolt resists this turning motion and also controls the bending of the leaf spring at its thinnest section. The push into the Front Pivot helps the cars weight shift towards the rear of the car because of a new directed angle of force toward the front of the vehicle. (The "Instant Center" moves farther forward). This is where the system emulates a Four link system !
The pinion angle is also maintained. (See illustration)

1. The Front Pivot

Two steel plates sandwich the leaf spring sides. Two attach points in the plates provide the user with a selection in which the forward Force Transfer Link rod end can be located. A machined aluminum spring eye bushing and steel insert supports the front of the spring while allowing the plates to pivot. A spring stop bolt controls and restricts spring wrap-up. Spacers are provided for different vehicle applications that control clearances in the front spring eye pocket

2. Force Transfer Link

This is a length of chromoly tubing with CNC machined threaded inserts TIG welded into each end. The front Insert is machined with right hand Threads and a HEX outer shape for Simple wrench adjustment of the Installed assembly. The rear insert is Left hand threaded. Opposite thread Styles at each end provide the means to easily lengthen or shorten the link for desired pre-load adjustment.

3. Rear Mount

A welded ¼" steel assembly replaces the original vehicles spring perch and incorporates the mounting provisions for the rear rod end of the Force Transfer Link.

Monoleaf springs

Calvert Racing, the company who introduced the CalTracs Two-link System is proud to announce our "Split-Leaf Mono" spring, an innovation in leaf spring technology. This revolutionary concept allows you to have the proper spring rate, and desired ride height for your high horsepower racecar or boulevard cruiser. Calvert Racing has provided 2-piece springs used by the last 5 World Champions in Stock Eliminator, now you can own these same proven springs.

These are not a replacement spring designed to be used on a totally stock application, but if you have a performance street rod or muscle car you'll be amazed at the ride quality and improved traction of these springs when combined with the CalTrac Bars.

How Much Power Can You Put to the Ground with Caltracs?

                

 

So you tell that there is no way to get traction with leaf-springs?? Wrong! Check video below and see yourself!

This car had run 4.48sec/169MPH at 1/8 mile!

3100lbs, no anti roll bar, leaf springs, Caltrac suspension, 315 radial

Installation

Installing the CALTRACS is very straightforward. Raise and support the car high enough to remove the rear tires. Allow adequate working space. Next, the rear spring assemblies should be removed. This will facilitate replacement of the front eye bushings. Support the rear end housing in place while the springs are out. This will eliminate the need to disconnect the drive shaft, brake lines etc. Press or have pressed, the original front eye bushing out of each spring assembly. Replace these with the machined aluminum CALTRACS bushings supplied in the kit. Now, reinstall the rear springs into the car.

With each spring assembly ready to go in, position the forward pivot assembly to the front spring eye. (Assure that the Spring Stop Bolt is located on the upper surface of the spring.) Install the Steel Bushing through the pivot and front spring eye bushing. Now, reinstall the spring using the original hardware. Repeat the process for the other side.

Lower the rear axle assembly on to the springs. Install the supplied spring perches as you would the stock items being replaced. Attach the shocks.

Now the Force Transfer Link can be installed by starting the HEX (wrenching) end on to the forward rod end. Remove the rear rod end from the spring perch and start its threads into the rear Force Transfer Link. Adjust the assembly to proper length by holding the rear rod end then rotating the Force Transfer Link until the rear rod end will line up with the mounting hole in the rear spring perch. Install the rear rod end fastener and secure.

With the CALTRACS installed and the rear tires reinstalled, lower the car to the ground. As an initial setting, turn the Force Transfer Link until the spring Stop Bolt just contacts the upper surface of the spring, then turn the Force Transfer Link one turn more to establish pre-load. Tighten the Force Transfer Link lock nut. That's it!

Caltrac Ultimate Wheelie Bar

The triangulation of the design forces the tire into the ground when pressure is applied to the roller rather than just transferring the load onto the conventional wheelie bar rollers and lifting the rear wheels off the ground.  The more pressure you apply to the roller the harder it pushes down on the axle and tires.

The system allows 2 adjustment points to give a total of 4" up and down.

Because the system applies pressure to the axle rather than unload the axle only one wheel is needed and the car will stay straight and stable.

The contact patch of the upper wheel needs to have a reinforcement plate on the floor pan to handle the load. 3" by 10" 3/16 steel

The spring cushions the load and applies a smooth weight transfer without violent slamming together of the components.

           

Measure the center to center of the rear springs

1. Set the car on the ground

2. Measure on a level plane 28" back from the axle tube.

3. Measure from the floor pan to the ground.

4. Mark the 28" point on the floor pan and weld in a plate 3"x10" to carry the load of the center or axis wheel (fig 7)

If you car is too short to get the plate at 28" call for instructions

Weld or bolt in plate as shown with the center at 28" from rear of axle tube measured horizontally from rear face of axle tube.