Most recently at this summer's Open Track Challenge, where drivers race at seven different tracks in seven days, Mumford not only took first in Touring 1, the fastest class to require the cars to be driven from track to track, but placed second overall in a field littered with dedicated track cars. And for that event, he had plain old Michelin Pilot Sport street tires.
Our advice to the other nine drivers: Turn that boost knob just a little bit more.
2001 Viper ACR
Engine
Engine Type: V10, aluminum block and heads
Internal Modifications:Engine built by Caldwell Development (CDI) with forged crank, forged rods, 10.0:1 forged pistons, CDI camshaft, 1.7:1 roller rockers, CDI ported heads
External Modifications: Extrude Honed intake manifold, CDI Headers, CDI baffled oil pan, Bondio Fabrication exhaust
Engine Management Modifications:Viper Shop tuned ECU
Drivetrain
Layout: Front engine, rear-wheel driveDrivetrain Modifications:Unitrax axles, True-Track limited slip differential, 3.55:1 final drive
Suspenson
Front: EMI Racing suspension with Penske triple-adjustable shocks, 600 lb/in springs and mono-ball A-arms
Rear:EMI Racing suspension with Penske triple-adjustable shocks, 850 lb/in springs and mono-ball A-arms
Brakes
Front:14-in. vented Stoptech rotors with Stoptech four-piston calipers, EMI Racing brake lines
Rear: 13-in. vented Stoptech rotors with Stoptech four-piston calipers, EMI Racing brake lines
External
Wheels:18x12-in. front and 17x13-in. rear Complete Custom aluminum wheels
Tires:305/30ZR-18 front and 335/35ZR-17 rear Hoosier R3S03