Competition Setup

To completely empty your cooling system for the first time:

1. Remove the intercooler tank cap.
2. Remove the lower radiator hose that’s connected to the electric water pump and let all of the coolant run out.
3. Remove the radiator cap and pour distilled water into the radiator to flush the rest of the coolant.
4. Put the radiator hose back on the pump, making sure not to overtighten it.
5. Pour 3–4 gallons of distilled water into the radiator at the cap, and put the cap back on.
6. Fill the intercooler one‑third of the way with water and turn the water pump on. If you hear an audible noise from the water pump and/or intercooler pump when the engine is off, air could still be trapped in the system. Squeeze the lower radiator hose to release trapped air.
7. Visually check the water level and add more if needed to avoid starving the intercooler pump.
8. Fill the remaining two‑thirds of the intercooler tank with ice.
9. After your run, use an electric pump to siphon out the intercooler.

The 2021 Drag Pak is equipped with Mickey Thompson ET Front^™ 27.5X4.0‑17‑inch front runners and 30.0X9.0R 15‑inch ET Drag^® Pro Drag Radial rear slicks. This tire combination is common to both the BOGART Base Wheel Kit and WELD Racing Beadlock Wheels available on the Drag Pak.

Regardless of which wheel combination the car has, the vehicle will be delivered with 40 psi in the front and 20 psi in the rear. Mickey Thompson suggests a pressure range of 35‑40 psi in the front and 18‑20 psi in the rear. Track temp and conditions will have the greatest impact on the optimal pressure. It’s recommended to check the air pressure in the pits and during the final check in the staging lanes prior to making a pass.

Front and rear alignment

Front: The Drag Pak comes pre‑aligned. Caster, Camber, and Toe are pre‑set, but for best performance and tracking, the front Toe‑In should be 1/8" positive when aligned at race weight. Use the driver and/or ballast to achieve the correct “as‑raced” weight.

Rear: The rear‑end alignment should be performed with the rear anti‑roll bar disconnected. The lower links are fixed and non‑adjustable.

Ride height

The Drag Pak’s ride height can be adjusted by the preload on the front and rear springs on the coilovers by using a special spanner wrench from Bilstein (part number B4‑XS1‑Z001A00). Make sure to tighten the lock ring against the preload ring when you’re finished adjusting preload. Click here for more tech info from Bilstein on the struts and shocks.

Once you’re familiar with the suspension adjustments, a recommended ride height is:

• Front: 27‑3/4"
• Rear: 28" measured from the ground to the highest point at the center of the wheel arch.

The rear shock brackets have multiple holes for various bracket settings, but it’s recommended to keep the position of the bolt as delivered.

Pinion angle

This can be set by adjusting the heim joints on the upper control arms and using a digital level to check the angle between the driveshaft and the flat face of the third member on the rear differential. A good starting point is to have the car on a flat surface like an alignment rack or drive-on hoist. The pinion angle should measure between negative 1 and 1.5 degrees. When making these adjustments, make sure the heim joints have proper thread engagement when adjusting the upper control arms. Make sure to tighten jam nuts once adjusted. Measure both arms and make sure they are equal.

Anti-Squat

Anti-squat behavior can be changed by moving the rear upper control arm mounting locations. There are five holes on the rear upper control arms that will allow for more or less anti-squat depending on track conditions. The rate of anti-squat is controlled by the shock compression/rebound damping.

Pre-load

The Drag Pak is delivered with the rear suspension in a neutral pre-load setting. To confirm, the rear upper and lower control arms should be easy to turn. If track conditions dictate pre-load for more traction, it can be set by shortening or lengthening the passenger-side upper control by loosening the jam nut and turning the control arm.

Anti-roll bar

The Drag Pak is delivered with an anti-roll bar in the rear. It features adjustable end-links/heim joints that can be used to adjust wheel loads if desired. It’s recommended that the rear end be aligned with the anti-roll bar disconnected. Don’t forget to re-attach the end-links to the axle once alignment is complete.

The adjustable wheelie bar may be raised or lowered for either competition or transportation in and out of the trailer. The wheelie bar height should be measured from the ground to the center of the wheel.

It is the operator’s responsibility to understand and properly use all of the safety equipment on the 2021 Drag Pak. Please check that all safety systems in the vehicle are in good condition and are set up to fit each driver, per the rules and regulations set by the competition sanctioning body.

Parachute

The parachutes are mounted on the rear of the car and are designed to deploy at 120mph. The parachutes are mounted on the rear of the car and are designed to deploy at 120mph.

It's important the parachute deployment system is always functioning before each pass. To deploy, pull back on the lever, which will release the spring-loaded parachute. For instructions on care, repacking and more, download this PDF.

Safety Harness & Window Net

Before driving the vehicle, the safety harness must be adjusted to fit each individual. It’s best to have someone help with tightening belts and checking the window net. For more information on setting up the harness, refer to the instructions from the manufacturer that are provided with the vehicle.

The Drag Pak is delivered with two different sizes of SFI-certified roll bar padding in the trunk for operator installation on the roll cage. This padding must be installed in any areas of the roll cage where the driver’s helmet may contact roll cage components. Consult your racing sanctioning body’s rulebook for more information.