Racecar Profile: 2015 Subaru WRX STI Rally Car (NR4 Spec)
By Winding Road Staff
June 18, 2015

Subaru’s newest WRX STI is ready to be unleashed on rally circuits around the world. Constructed to meet the FIA’s new-for-2015 NR4 technical regulations, it is the newest Subaru WRX STI production rally car that is eligible in WRC 2, ERC 2 and other regional championships.
Built by the motorsport preparation specialists at JRM Group in Northamptonshire, UK, an official Base Team of Subaru Tecnica International (STI) and the winners of six WRC production titles and 47 world rallies, JRM believes its latest NR4 challenger will its competition a serious run for its money in the WRC 2 Production Cup.

Steve Smith, JRM senior sales manager, had this to say of the new car:

JRM’s latest-specification Subaru WRX STI has been heralded as the Japanese manufacturer’s best handling production-spec rally car to date due to improvements in rigidity and suspension enhancements in the production vehicle. We noted the same when we drove both the standard WRX and WRX STI road cars last year.

“This 2015 car features Subaru’s latest vehicle technology that has never been used in the WRC 2 Production Cup. We expect it to be competitive,” Smith added.
Here are the technical specifications for the new rally car:
ENGINE
- Subaru 2.0-litre, flat four turbo
- Maximum power output: 280 BHP @ 4250 rpm
- Maximum torque output: 560 Nm @ 3000 rpm
- Variable inlet and exhaust camshaft
- Two stage anti-lag system
- Homologated intercooler water spray
- Homologated coolant radiator
- Stainless steel exhaust system with silencer and catalytic converter
TRANSMISSION
- Hewland 5-speed dog gear kit
- Front and rear limited slip differentials
- Electronically controlled centre differential
- Heavy-duty front specification driveshafts
- AP Racing paddle clutch assembly
CHASSIS
- Target homologated minimum weight: 1393 kg
- FIA/JRM welded safety cage
- 80-litre racing bag tank
- Quick disconnect refuel couplings
SUSPENSION
- Öhlins dampers with three-way adjustment
BRAKES
- STi / AP Racing homologated brake package for tarmac and gravel
- Driver adjustable brake bias
- Hydraulic hand brake with Manual Lock
ELECTRICAL / DATA DISPLAY SYSTEM
- Motec M800 with drive-by-wire throttle engine controller
- Motec SDC centre differential controller
- Motec display screen
INTERIOR
- Sparco steering wheel
- Sparco Pro ADV fibre-glass HANS seat
- Sparco 6-point harness
- FEV 3kg-mounted extinguisher system
- FEV hand held 2.0kg
- Helmet net
- First aid kit
- Wheel brace and jack
- Map light
OPTIONAL EQUIPMENT
- Heated front screen - £475.00
- Bonnet lamp pod assembly - £2,995
- Roof vent assembly - £1,750
WHEELS (INDIVIDUAL PRICE)
- 8” x 18” aluminium (asphalt) – £275
- 7” x 15” aluminium (gravel) – £160
REBUILDS
- Approximate costs of major unit rebuilds:
- Engine after 1,500 km – £6,500 (plus any turbo costs)
- Gearbox/diff inspection every 1,250 km – from £1,950
PRICING
- JRM NR4 Subaru WRX STI: £99,995 ($158,700 US)
Steve Smith
Email: ssmith@jrm-group.com
Phone: +44 (0) 7590 851 862
http://www.jrm-group.com/
http://www.jrm-group.com/