Radical SR5 CN Racer

The Radical SR5 CN Supersport is a high specification endurance sports racer, which complies with FiA CN regulations, and is designed specifically to accept the Honda V-Tec and Ford Duratec engines.

"the SR5 chassis does not rely on using the engine as a stressed member, enhancing reliability of the road car-based engines, increases service intervals and dramatically reduces chassis vibration"

Hewland, Sadev or ultra-lightweight Ralt transaxles can be accommodated with gear changes by manual shift or paddle-operated pneumatic semi-automatic actuation.

The SR5 chassis does not rely on using the engine as a stressed member, enhancing reliability of the road car-based engines, increases service intervals and dramatically reduces chassis vibration. Underbody aerodynamics are derived from Radical's SR9 Le Mans prototype, while the ultra-lightweight bodywork is based on that of the SR8.

The SR5 suspension is Radical's unique and well-proven 'Nik' fully-floating double-wishbone system, which incorporates Intrax triple-adjustable shock absorbers, as fitted to the Radical SR9. Braking is courtesy of 4-pot Radical calipers and class-leading 280mm diameter floating ventilated discs, front and rear.

Available as a rolling chassis or a turnkey car, the SR5 CN is a highly competitive CN-spec racer, eligible to race in all of Radical's global series, plus a number of endurance events, including the European V de V endurance series and the North American Modern Endurance Challenge,

The SR5 CN may be supplied with either 15" front & 16" rear wheels, or smaller 13" wheels front and rear to comply with the VdeV class CN rules.

Technical specification

Chassis
The lightweight powder-coated steel spaceframe chassis is clad with powder-coated bonded aluminium panels and complies with the current FIA CN regulations. The front crash box is manufactured from aluminium honeycomb, which restricts average deceleration to a maximum of 25g in a head on crash. The chassis safety cell will withstand a frontal impact of 20 times the car’s weight, and 14 times the car’s weight vertically on the rear roll-over bar.

The steering column is of a collapsible type, complying with FIA regs. The pedal box is fully adjustable and is mounted 200mm behind the front of the survival cell. The chassis incorporates an 77 l fuel cell mounted behind the driver and an air jack system with rear mounted valve and lance.

Suspension
The patented ‘Nik’ fully floating suspension system is simple to maintain and robust in an on-track incident. Fitted with triple adjustable Intrax shock absorbers, the suspension system can be easily tuned to suit individual circuits and gives drivers the ‘Radical confidence factor’ which allows the car to be put on the limit, lap after lap.

Cockpit
A wrap-around carbon composite dashboard houses all the switches and controls, with space for dashboard/logger of choice. The SR5 cockpit is spacious and comfortable with an adjustable drivers seat and pedal box. A double driver/passenger seat can be supplied.

Wheels
Lightweight three piece 8” x 15” dia. driver front, and 101/2” x 16” dia. rear wheels, with Radicals quick change centre-lock fixing.
Optional three piece 8” x 13” dia front, and 11” x 13” dia. rear wheels with Radical quick change centre-lock fixing.

Brakes
Four pot Radical calipers and 280mm dia x 25mm 48 vane floating ventilated discs front and rear.
Dash mounted brake bias adjuster.

Size/Weight
Width 1.8m, Length 4.05m, Dry weight with Honda Tec/Hewland - 559 kg

Engine Options
Available with fitting kits for both Honda Tec and Ford Duratec - comprise engine mounts, exhaust, silencer, oil cooling pipes/fittings, oil tank, water cooling pipes/fittings, swirl pot etc.

Gearbox Options
Available with fitting kits for Hewland and Sadev transaxles - comprise adapter plate, mounting bracket, drive shaft/CV’s, linkage, optional oil cooler and pump.

Quick Shifter
A Powertec pneumatic quick shift system can be supplied complete with all fittings, linkage, hoses and wiring loom.

- SR5 Turn-key car
Radical will supply a turn-key SR5 CN endurance spec car which features:

- 237bhp Powertec Honda V-Tec (222bhp/169 ft lbs @ 7000rpm)
- Powertec Life ECU
- Hewland transaxle
- 280mm dia x 25mm floating vented discs (largest in class)
- 4 pot Radical calipers
- 13"dia. or 15"/16" dia. three piece centre lock wheels
- Lightweight bodywork with lightweight LED lights
- Advanced aero pack with front and rear diffusers and bi-plane rear wing