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With the Pro 4 project, I wanted to create a competitive chassis; that, while conventional in layout, has a strong focus on the important details for a race platform.

The concept of the Pro 4 is a no-compromise Pro level car that is competitive at the highest level of racing.. right out of the box. Woven graphite, titanium, aluminum, carbide, and carbon fiber reinforced nylon are used extensively throughout the car, making the Pro 4 extremely light and strong.

The Pro 4 is our highest performing electric touring car ever!

I wanted to bring back some of the values of our Pro 2 platform that we felt were successful. More bang for your buck! A lot of attention was devoted to the fit and finish of the Pro 4 to ensure it is truly a “pro” level chassis. This allows racers to build the car and be competitive straight out of the box. Last but not least, we always want to incorporate style into our product. We hope you’ll find that with many of the components, form and function work together to bring you a chassis with superior style and class leading performance.

The RS4 Pro 4 is a radical departure from the RS4 Pro 3, offering a change of concept for HPI both for suspension geometry & transmission. The all new shaft drive RS4 Pro 4 is the result of extensive track testing at the highest levels of competition.

New drivetrain, new suspension, and new steering geometry take the Pro 4 to a new level of performance. Consistency, tuning options & drivability have all been drama-tically improved. The most significant change is that the Pro 4, at the requests of our drivers & customers, uses a shaft drive transmission. Track testing revealed the benefits of low maintenance & fast acceleration that a shaft drive transmission offers.

Again at the requests of our customers, the RS4 Pro 4 is only available in self-assembly kit form with key items like the radio, ESC, body and tires left to the choice of the driver. The Pro 4 will use the highest quality materials & will have a high standard specification to make it a force at the race track.

Our team drivers are racing the Pro 4 at major electric touring car races around the world. This factory support and continued development of the platform ensures that the Pro 4 will keep up with the latest racing technology.

Download the Pro 4 wallpaper here!

Multiple shock points allow fine tuning of the spring rate and dampening throughout the stroke of the suspension.

Standard front anti-roll bar for easily limiting chassis roll.

Fully adjustable front and rear camber for maximum response and even tire wear.

Allows racers to dial in the ideal amount of chassis roll for track conditions and the roll balance from front to rear based on driver preference.

The rear of the Pro 4 has twelve mounting positions for maximum tuneability.

Easily adjustable height of inner camber link for fine tuning of chassis roll

Supplied set screws allow adjustment of front and rear suspension arm droop.

Provided shims allow racers to fine tune wheelbase to suit track conditions.

- Woven Graphite Main Chassis
- Woven Graphite Upper Deck
- Woven Graphite Shock Towers
- Woven Graphite Steering Plate
- Purple Titanium Turnbuckles
- MIP CVD's, Purple aluminum of course!
- Carbon Plastic: Arms, Uprights, Hub Carriers, Steering Blocks, and Gearboxes
- Carbide Ball Differential
- Front One-way
- Aluminum Threaded Shocks with Bladders
- Aluminum Main Drive Shaft
- Aluminum Motor Mount
- Aluminum Spur Gear Adapter
- Aluminum Hex Clamp Hubs w/ adjustable Track (Width)
- Aluminum Wheel Lock Nuts
- Efficient 64 Pitch Spur and Pinion Gears
- Socket (Hex) Screws and Fasteners used throughout chassis
- Pre-cut Urethane Foam Bumper
- Drive Ratio: 2.4375
- High Quality Ball Bearings used throughout (24)

- Adjustable Camber - via turnbuckles
- Adjustable Caster - with included 0, 2, 4, and 6 degree uprights.
- Adjustable Toe - via turnbuckles
- Variable Ackerman - via the steering plate
- Bump Steer - adjustable via shims (washers)
- Adjustable Roll Center - via shims under the pivot blocks
- Vertical Inner Camber Link Adjustment - via mounting location and height with shims/ washers. 2 inboard locations
- Adjustable Down Stops (Droop) - via round point set screws
- Shock Mounting Positions - 3 holes on the tower and two holes on the arm.
- Anti-Dive/ Kick-up - adjusted with washers
- Anti-Roll Bar

- Adjustable Camber - via Turnbuckles
- Adjustable Toe - via Pivot Blocks (2.5 and 3.0)
- Adjustable Roll Center - via shims under the pivot blocks
- Vertical Inner Camber Link Adjustment - via mounting location and height with shims/ washers.
- Adjustable Down Stops (Droop) - via round point set screws
- Shock Mounting Positions - optimized for progressive wheel rates with 4 holes on the tower and 3 holes on the arm.
- Anti-Squat - adjusted with washers
- Wheelbase Adjustment - via washers
- Anti-Roll Bar

- Top to bottom mounting of gearbox for precise alignment and mesh of gears
- Carbon Plastics used to increase rigidity and reduce component weight for better chassis response and tuning
- Adjustable, variable Ackerman steering geometry to increase steering feel and increase corner speed
- Completely ball raced steering assembly for smooth steering with reduced play
- Crank integrated servo saver with adjustable tension
- Included ride height and droop gauge for accurate suspension adjustment.
- Pivot Ball Block adjustments to maintain suspension precision and to reduce misalignment of the suspension pins.
- 3mm inboard suspension shafts for strength and 2.5mm outboard shafts for reduced weight and improved wheel clearance
- Set screws used to retain outboard suspension shafts for easier maintenance
- Overall lightweight chassis for best performance and adjustable ballast positioning with optional ballast weights.
- Low center of gravity and centralized weight for improved cornering power and overall responsiveness.
- Reduced unsprung weight for increased response and improved control

New for HPI is the standard 6-ball bearing steering assembly , providing a slop-free steering setup. New ball cups and socketed ball ends are also included to eliminate steering slop.

Steering ackerman can be easily adjusted by moving the steering links to optional holes on the woven graphite steering plate to help fine tune the steering response for faster lap times.

Pivot blocks provide for a range of suspension adjustments not found on many other touring cars.Roll center can be adjusted using aluminum shims.

The new Pro 4 combines a long list of standard features with track tested design to create our highest performing electric touring car ever. Keep an eye on racing news to see the results of the Pro 4 in worldwide competition. Click on the link below to order your own Pro 4 and get the jump on the competition.

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