Mazda RX-7 with a Turbo 20B Triple-Rotor

Wouter Bouman has been racing his 1993 Mazda RX-7 since 1996. The RX-7 is powered by a turbocharged 20B triple-rotor that makes 916 horsepower and 672 lb-ft of torque to the wheels on 24 psi of boost from a single turbocharger. Behind the engine sits a Tilton triple-disc clutch, Jerico five-speed dog box, carbon fiber driveshaft, and Cobra IRS with a Torsen T2R differential. The combo was good enough for a win at Knox Mountain Hillclimb 2017 and set a record.

Full Specs:
Engine:

• 20B triple-rotor built by Forcefed Performance
• bridgeported
• ID2000 injectors
• Microtech lt16c with x6 igniter module
• dry sump
• 916 whp
• 672 lb-ft wtq

Turbo:

• Precision 7675 Sportsman Gen2 turbocharger
• stainless steel 321 ss manifold with 4-inch downpipe
• Tial 60 mm wastegate
• Tial blow off valve

Drivetrain:

• Jerico roadrace five-speed dog box with cooler
• Tilton 3-disc clutch
• PST carbon fiber driveshaft rated to 3000 hp
• Cobra IRS with cooler
• Torsen T2R LSD
• Driveshaft Shop 1000 hp axles
• Porsche 930 CVs
• Samberg cradle

Suspension:

• Penske racing shocks with remote reservoirs
• Eibach springs
• Speedway front swaybar
• solid bushings

Brakes:

• Brembo GTR monoblock calipers
• Brembo 14×1.4 rotors with aluminum hats
• ABS brakes with adjustable prop valve
• 2.0 turns steering ratio
• HD wheel studs

Wheels/Tires:

• CCW 18×11.5
• 18×13 wheels

Body:

• front and rear flared fenders
• fiberglass hatch
• fiberglass doors
• carbon fiber hood
• Lexan rear window
• Daytona Prototype carbon fiber rear wing by Crawford composites

Source: Hillclimb Monsters