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Time Machine: Sierra Sierra Mitsubishi Evo VIII

For the past two years, the sport of time attack has been given a global stage, the World Time Attack Challenge held at Eastern Creek Raceway in Australia. The event is simple; the top time attack teams from each country around the globe are invited to represent their flag in an epic battle to claim the title of fastest time attack car in the world. For the past two years, the United States has been represented by one car and one car only, the Sierra Sierra Enterprises Mitsubishi Evo VIII.

he team at Sierra Sierra Enterprises entered the world of time attack in 2009 and although they are relatively new to the time attack scene, they are no strangers to motorsports. Sierra Sierra Enterprises comes from a long history of open-wheel racing in the Star Mazda and Formula Atlantic series before moving into time attack. Their expertise and knowledge in open-wheel racing has led to a short learning curve for making the transition to production based sports cars. In their third season of time attack racing, they are already serious contenders for the World Time Attack Challenge title. They missed it this year by just one tenth of a second.

Time Machine: Sierra Sierra Mitsubishi Evo VIII Time Machine: Sierra Sierra Mitsubishi Evo VIII Time Machine: Sierra Sierra Mitsubishi Evo VIII

Their amazing story starts with a Mitsubishi Evo VIII, one of the most popular platforms in time attack racing around the world. At the heart of the beast lies a stroked 2.2L Mitsubishi 4G63 4-cylinder turbo engine meticulously built by the geniuses at Cosworth. It’s not just any old 4G63 engine though. Everything has been carefully planned and selected for maximum performance and reliability and the result is over 825 horsepower at the wheels on E85 fuel! The potent powerplant ingests incredible amounts of air through a Borg Warner EFR Performance Series turbocharger where a dual wastegate setup using Turbosmart Comp-Gate40 wastegates control the amount of boost. Air is force fed through a custom intercooler setup before it makes its way to an OEM throttle body off of a Nissan- yes, Nissan- VH45DE V8 engine. Air makes its way into the engine via an HKS Kansai intake plenum and into the Cosworth CNC ported cylinder head. A Cosworth ultra-high rev dual valve spring kit allows the engine to rev up to 8600rpm time and time again white Cosworth EVO 8 SWB camshafts control Cosworth intake and exhaust valves. A custom fuel system spews massive amounts of E85 fuel through 1,600cc RC fuel injectors where it meets up with the air inside the block. Cosworth forged pistons compress the air/fuel mixture while an Okada Project ignition system lights the fire. Spent exhaust gasses make their way through a Full-Race exhaust manifold before making their way back through the Borg Warner EFR Performance Series turbo and out through the custom exhaust. The intricate timing of the high performance Cosworth engine package is controlled by a Cosworth Pectel SQC engine control unit. Royal Purple XPR motor oil is trusted to keep the engine safe.

The massive amounts of horsepower generated by the Cosworth power plant make their way through a stock Mitsubishi 5-Speed transmission fortified with Quaife internals, Group N rally spec transmission gears, and a Tilton clutch and flywheel setup. A stock center differential is used with the aid of a Cosworth Pectel EDC that controls the balance of power to the front and rear wheels. An OS Giken rear differential finishes up the drivetrain modifications.


We all know that time attack is as much, if not more, about handling than it is about power and the crew at Sierra Sierra is well aware of that as well which is why almost every component of the suspension system on this corner-carving Evo is custom fabricated in-house. A slew of custom suspension pieces allow for precise adjustment of everything from camber to bump steer. The custom rear sway bar is even adjustable on the fly by the driver via a lever in the cockpit. The only part of the car’s sophisticated, yet straightforward suspension system that Sierra Sierra didn’t make themselves are the struts and Time Machine: Sierra Sierra Mitsubishi Evo VIIIsprings. For the struts, the team chose high-tech and extremely adjustable Dynamics DSSV struts paired with Eibach springs. The car’s handling prowess is finished off with 295mm wide Hankook Ventus TD Z221 DOT tires and are wrapped around 18” Rays wheels. A Brembo Group N Rally Spec brake kit is in charge of stopping this bullet.

OTime Machine: Sierra Sierra Mitsubishi Evo VIIIne of the best things about time attack is the freedom to innovate in the aerodynamics department. Sierra Sierra has gone to extreme lengths to create an exceptional aerodynamic package for their Evo VIII and it has worked. Nearly every aerodynamic aid protruding from the exterior of the Evo has been designed by their in-house experts. The front bumper and front spoiler are designed by Sierra Sierra and brought to life by Kaminari using lightweight dry carbon fiber. Kaminari is also responsible for the dry carbon fiber hood, side skirts, and rear diffuser. SEIBON dry carbon fiber front fenders, doors, and rear trunk lid are also used to help shed weight. An APR Performance rear wing is mounted directly to the chassis while APR Performance side mirrors are also used due to their low profile shape. Perhaps the most interesting aerodynamic aide on this car is the tunneled flat bottom belly created by Sierra Sierra.

Inside, the Sierra Sierra Evo VIII is strictly business. Almost every bit of stock interior has been scrapped to provide the most weight savings possible. A custom carbon fiber dash shell replaces the factory dash while a Cosworth Electronics Omega D2 digital dash replaces the factory gauge cluster. Professional driver David Empringham straps himself into a carbon fiber racing seat from Recaro and cinches down on the Willans racing harnesses before grabbing a Sparco steering wheel and getting on to the track.

So there you have it, a detailed look at one of the fastest production based cars in the world, the Sierra Sierra Enterprises Mitsubishi Evo VIII. The team at Sierra Sierra is a stunning example of innovation, expertise, and professionalism within the world of time attack. As the sport continues to grow in the United States and around the world, it is teams like Sierra Sierra that demand our attention by continuing to change our definition of what can and cannot be done with a production-based car.

For an in-depth look at the Sierra Sierra Evo visit www.MotoIQ.com


 


Time Machine: Sierra Sierra Mitsubishi Evo VIII

Essentials

Vehicle: Mitsubishi Evo VIII

Owner: Dennis Kottke

Driver: David Empringham

Location: Minden, Nevada

Engine: Cosworth Mitsubishi 4G63 2.2L

Horsepower: 825+ hp at wheels

Website: www.sierrasierra.co

Engine Modifications:

Connecting Rods / Crank: Cosworth Big Journal 94mm Stroker Kit (uses ex-F1 rod bearings)

Camshafts: Cosworth EVO 8 SWB 290IN/280EX

Valves/Springs/Retainers: Cosworth Ultra High Rev Dual Spring kit

Cylinder Head Mods / Gasket: Cosworth Big Valve CNC Ported / No head gasket used

Head / Main Studs: Cosworth H-11 Tool Steel 11mm (off the shelf kit)

Intake Manifold / Throttle Body: HKS Kansai plenum/OEM Nissan VH45DE throttle body

Fuel Pumps: Bugatti Veyron x 2

Engine Control Unit: Cosworth Pectel SQ6

Ignition Coils: Okada Projects EVO 8 Quad Pac + Plasma Lift

Fuel Injectors: RC Engineering 1600cc x 4

Exhaust Manifold: Full-Race EVO 8

Turbo: Borg Warner EFR Performance Series

Waste Gates: Turbosmart Comp-Gate40 x2

Fuel: Reference grade E85

Oil: Royal Purple XPR 20W-50

Driveline Modifications:

Transmission: Stock Mitsubishi 5-speed casing with Quaife internals

Transmission Gearing: Group N rally spec

Clutch / Flywheel: Tilton Carbon clutch / Light weight Tilton

Gikken Rear Differential

Differential Type: Stock Mitsubishi Center

Differential Controller: Cosworth Pectel EDC

Wheels & Tyres:

Rays racing wheels Hankook Ventus TD Z221 295/30/18

Suspension & BrakeMods:

Front Springs (Make & Rate): Eibach

Rear Springs (Make & Rate): Eibach

Front Shocks (Make & Rate): Dynamics DSSV Front Struts

Rear Shocks (Make & Rate): Dynamics DSSV

Brakes: Brembo group N rally spec.

Exterior Modifications:

Front Bumper: Kaminari - Sierra Sierra Enterprises Design

Front Lip Spoiler: Kaminari - Sierra Sierra Enterprises Design

Front Fenders: Siebon

Hood: Kaminari

Side Skirts: Kaminari

Rear Fenders: Stock Mitsubishi Flared by Sierra Sierra Enterprises

Rear Bumper: Sierra Sierra Enterprises

Rear Diffuser: kaminari

Trunk Lid: Seibon

Spoiler / Wing: APR Performance

Doors: Siebon

Headlights: non

Taillights: Mitsubishi

Mirrors: APR Performance

Grill: Sierra Sierra Enterprises Paint: Livery by: ALFA livery design

Painted by: Norris Auto Body - Minden, Nevada

Custom Body Work: Sierra Sierra Enterprises

Interior Modifications:

Roll Bar / Cage: Sierra Sierra Enterprises

Seats: Recaro

Harnesses: Willans

Gauges: Cosworth Electronics Omega D2 Dash

Sponsors:

Cosworth, Borg Warner, Royal Purple, Turbosmart, Full-Race, Okada Projects and Hankook

Time Machine: Sierra Sierra Mitsubishi Evo VIII