This page contains details of Car No 1. For Car No 2 click here
This Bentley Turbo R 1990 (above) is currently being modified and enhanced by Phantom Motor Cars for the companies own use, to compete in circuit racing and sprint events organised by the Bentley Drivers Club.
The following pages will contain information and photographs relating to the various modifications carried out and hopefully results of various meetings.
BDC - Silverston 2005
Racing Bentley Turbo R - Specifications to date.
Bentley Turbo R in Sherwood Green (Original Magnolia hide interior). First Registered 1 August 1990. Registration No. H248 CTP (formally ALI 1). Chassis No. SCBZRO4AOLCH33416. Engine No. 72732L 410I/TEL 6,750 CC.
Mechanical modifications to date. (with approximate retail costs)
- Mulliner anti-roll bars front and rear 40 % stiffer. # 1496.00
- Performance brake package (Micro Alloy 320 mm discs) to the front. # 3735.00
- Continental T wheels 18 X 9.5 # 3500.00
- Special stiffer lowered (less 50 mm) front coil springs. # 900.00
- Lowered rear (50 mm) coil springs. # 700.00
- Deleted active ride. Fitment of Bilstein front shock absorbers and late specification 94 onwards improved top spring plates and shock absorber mounts. # 650.00 if done with springs. Front shock absorbers again changed to the original factory shocks as the Bilsteins were considered too soft.
- Viscous control differential. # 2284.00
- Deletion of boost control limiting, to ensure full and continuous max boost available from the current original turbo charger. Later changed to an electronically adjustable boost controller. # 1760.00. Minimum fuel octane rating required is estimated at 102 with 0.9 Bar boost.
- GM 400 3- speed Pursuit gearbox (Kevlar bands, re-valve with heavy duty clutches and strengthened torque converter) Essential to survive additional power output. # 3000.00
- AC system removed.
- Viscous fan removed.
- Vehicle lightened where possible but still retaining all necessary components to keep the Bentley road legal.
- Exhaust modification removing rear silencer box.
- Water injection fitted to the front brake discs to help prevent overheating.
- Mesh stone guards (grills) to the front radiator and lower front spoiler. # 2000.00
- Mesh grill to the rear lower apron. # 500.00
- Wing vents to the front wings. # 2000.00
- Arnage flush fitting oval front wing indicator repeaters.
- Rear seating removed. Light weight front seating fitted.
- All components removed from the doors. Carbon Fibre panels to the doors and dashboard.
|MSA regulation racing seating and harnesses with 2.4 kg fire extinguisher mounted between seats. Seats trimmed in Spruce green & black perforated hide with 'Winged B' embroidered into the top.|| ||Dashboard finished in Carbon Fibre with Mulliner chrome instrument bezel finishers and starter button. Time clock removed and turbo boost gauge fitted.|
The first official outing for the Bentley was June 2003 Le Mans 24 Hour race with the Bentley Drivers Club.
A last minute rush was required in order to complete all necessary works. This was the test of durability. For this trip, the boost limiting was reinstated. However, the rev limiter was still reached in road tests in top gear prior to the trip to France.
The trip to Le Mans and Saumur with the BDC was an outstanding success. A great long weekend was had by all. The Bentley Turbo R Racing, attracted a lot of attention and comments. The Racing Turbo performed faultlessly, covering approximately 1,500 miles. We were also fortunate enough to drive the full 24 Hr Le Mans Circuit (Le Sathe) the morning of the race, Bentleys sharing the circuit with Jaguar. Some good video was taken with some slightly hairy moments on some of the bends. Not Surprisingly, enthusiastic Bentley drivers seemed to end up at the front, just behind the Pace car.
First Meeting - Colerne in Wiltshire - Sprint event on 5th July 2003
Racing Bentley running 12 PSI of boost with 100 + Octane fuel
Times & results for Turbo R's and RT's
Phantom Motor Cars racing Turbo R alongside Warren Christies' cosmetically temporarily modified (I hope) standard Turbo R at the Colerne sprint.
|Name||Car||Practice 1||Practice 2||Run 1||Run 2|
|Phantom Motor Cars||Turbo R '90||71.15||73.69||72.49||71.43|
|Adam Stacy-Marks||Turbo R '95||77.01||74.08||73.21||72.24|
|Warren Christie||Turbo R '90||79.45||77.30||77.42||76.47|
|Colin Loshmer||Turbo R||94.37||85.12||81.78||82.01|
|Adam Stacy-Marks||Mk 6 Special V8 Turbo||72.57||71.88||70.38||69.83|
| || || || || || |
Second meeting - Silverstone - August 30th 2003
Lap times in practice sessions 1m16s and improving - then !! - Melt down.
Original engine block, vapour blasted. New crankshaft, pistons, rods and liners from a red label engine. All pistons, rods and gudgeon pins were balanced to 0.01g. This balancing exercise showed what low balancing tolerances Bentley originally found acceptable. We found a difference of 10g between the lightest and heaviest piston and rod assemblies. Crankshaft, drive plate and front pulley also balanced.
Detonation and Pre-ignition !
I guess it was too lean then. Too much boost and the injection system reached its maximum capacity. We now have to find a way of increasing the fuelling capacity at maximum boost. However, by rebuilding it, we should have a better engine for 2004. Lets just hope we don't have a repeat of this picture!
New for 2004
- Loose more weight
- Bigger charge cooler to keep the increased forced induction air cool
- More fuel pressure.
- New Alcon racing brake discs, callipers and pads on front
- Rebuilt engine
- Modified front suspension geometry (Increased negative camber)
- New front & rear shock absorbers (Remove self-levelling)
- New stiffer springs front and rear
- Lighter wheels and Yokohama tyres
- Water cooled charge cooler with electric circulation pump.
- Turbo RT Mulliner front and rear bumpers with front lower splitter.
- Reduced rear braking
- Venting to front brakes.
- Aeroquip brake hoses.
Collerne Sprint Meeting 2004 - Cancelled
BDC Silverstone race meeting - 21st August 2004.
Bentley, Vintage & PVT Scratch - Race No. 7 - 10 Laps.
1st - Simon Worthington (Phantom Motor Cars) No. 28
BDC Silverstone race meeting - 21st August 2004.
Bentley Handicap - Race No. 9 - 8 Laps.
4th - Stuart Worthington (Phantom Motor Cars) No. 128