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The following weights are based on my own measurements and are from a 1986 WR engined UR Quattro. They may differ for earlier models and also different varients eg. MB and RR Engines. Please note weights may not be exact, but should be within 100g for Kg. The Conversion used for kg to lbs is 1 Kg - 2.204 lbs. These weights may come in handy to those wanting to post items or those looking for weight saving options. Part weights are split by vehicle location.
Body panels
Engine
Transmission
Suspension
Brakes
Interior Trim
Exterior Trim
Body Panels
| Panel | KG | Combined KG | Total weight on car KG |
| Bumper Front | |||
| Valance Front | |||
| Bumper Rear | |||
| Valance Rear | |||
| Bonnet | 19.3 | 19.3 | 19.3 |
| Bootlid | 15.4 | 15.4 | 15.4 |
| Door (inc glass) | 21.8 | 43.6 | 43.6 |
| Inner Wing Gussett Front | 0.6 | 1.2 | 1.2 |
| Sunroof Panel | 5.6 | 5.6 | 5.6 |
| Wing Front | 6.8 | 13.6 | 13.6 |
| Wing Rear | |||
Engine
| Component | KG | Combined KG | Total weight on car KG |
| Complete Engine | |||
| Cylinder Head Bare | |||
| Cylinder Block Bare | |||
| Inlet Valve | |||
| Exhaust Valve | |||
| Camshaft | |||
| Cam Pulley | 0.5 | 0.5 | 0.5 |
| Springs (paired) | |||
| Followers (hydraulic) | |||
| Inlet Manifold | 4.3 | 4.3 | 4.3 |
| Exhaust Manifold | 6.7 | 6.7 | 6.7 |
| Turbocharger K26 | 6.2 | 6.2 | 6.2 |
| Wastegate | 3.6 | 3.6 | 3.6 |
| Piston | |||
| Conrod (+ Gudgeon Pin) | |||
| Crankshaft | |||
| Crankshaft Pulley | 4.5 | 4.5 | 4.5 |
| Oil Pump | 2.2 | 2.2 | 2.2 |
| Oil Pickup Pipe | 0.4 | 0.4 | 0.4 |
| Oil Cooler + piping | |||
| Flywheel | |||
| Sump | |||
| Intercooler | 3.0 | 3.0 | 3.0 |
| Fuel Metering Head | 5.0 | 5.0 | 5.0 |
| Warm Up Regulator | 0.7 | 0.7 | 0.7 |
| Radiator | 5.4 | 5.4 | 5.4 |
| Water Pump | 1.2 | 1.2 | 1.2 |
| Fan | 2.6 | 3.6 / 4.1 | 3.6 / 4.1 |
| Plastic Shroud | 1.0 | ||
| Metal Shroud | 1.5 | ||
| Expansion Tank | 0.6 | 0.6 | 0.6 |
| PAS Pump | 3.9 | 3.9 | 3.9 |
| Downpipe | |||
| Exhaust System | |||
Transmission
| Component | KG | Combined KG | Total weight on car KG |
| Complete Gearbox | 66.4 | 66.4 | 66.4 |
| Complete Differential Rear | 30.2 | 30.2 | 30.2 |
| Propshaft | 10.4 | 10.4 | 10.4 |
| Driveshaft FR N/S | 7.4 | 29 | 29 |
| Driveshaft FR O/S | 7.1 | ||
| Driveshaft R N/S | 7.1 | ||
| Driveshaft R O/S | 7.4 | ||
| Complete Transmission Setup Total | 136 kg | ||
| Front Differential Gear | 7.4 | 7.4 | 7.4 |
| Rear Differential Gear | |||
| Output Flange Front | |||
| Output Flange N/S Rear Diff | 1.9 | ||
| Output Flange O/S Rear Diff | |||
| Front Subframe Bare | 9.8 | 9.8 | 9.8 |
| Rear Subframe Bare | 10.4 | 10.4 | 10.4 |
| Clutch Assembly | |||
| Clutch Slave Cylinder | 0.5 | 0.5 | 0.5 |
| Clutch Master Cylinder | 0.5 | 0.5 | 0.5 |
| Wheel 8J Ronal | 9.3 | 37.2 | 37.2 |
Suspension
| Component | KG | Combined KG | Total weight on car KG |
| Front Strut Complete | |||
| Rear Strut Complete | 18 | 36 | 36 |
| Wishbone | 2.1 | 8.4 | 8.4 |
| Balljoint Front | 0.7 | 1.4 | 1.4 |
| Balljoint Rear | 0.8 | 1.6 | 1.6 |
| 5 stud Hub Unit | 1.7 | 6.8 | 6.8 |
| Front Spring | 3.7 | 7.4 | 7.4 |
| Rear Spring | 3.3 | 6.6 | 6.6 |
| Front Strut Unit Bare | 10.2 | 20.4 | 20.4 |
| Rear Strut Unit Bare | 9.1 | 18.2 | 18.2 |
| Steering Rack | 6.7 | 6.7 | 6.7 |
| Steering Track Arms Front | 1.2 | 2.4 | 2.4 |
| Track Arms Rear | 0.9 | 1.8 | 1.8 |
Brakes
| Component | KG | Combined KG | Total weight on car KG |
| ABS Module Unit | 4.5 | 4.5 | 4.5 |
| ABS Sensor | |||
| ABS ECU | 1.5 | 1.5 | 1.5 |
| Master Cylinder | 0.7 | 0.7 | 0.7 |
| Hydraulic Servo | 1.3 | 1.3 | 1.3 |
| Brake Disc Front | 6.7 | 13.4 | 13.4 |
| Brake Disc Rear | 3.6 | 7.2 | 7.2 |
| Brake Caliper Front | |||
| Brake Caliper Rear | 3.6 | 7.2 | 7.2 |
Interior Trim
| Component | KG | Combined KG | Total weight on car KG |
| Pedal Box | 3.7 | 3.7 | 3.7 |
Exterior Trim
| Component | KG | Combined KG | Total weight on car KG |
| Wiper Motor Front | 2.3 | 2.3 | 2.3 |
| Wiper Motor Rear | 1.3 | 1.3 | 1.3 |
| Windscreen | 10.3 | 20.4 | 20.4 |
| Rear Screen | 5.3 | ||
| Rear 1/4 Windows (pair) | 4.8 | ||
| Rear Light Unit | 0.6 | 1.2 | 1.2 |
| Smoked Coupe Strip | 1.5 | 1.5 | 1.5 |
| Bootlid Slat trims | 0.2 | 0.4 | 0.4 |
| Headlight | 2.8 | 5.6 | 5.6 |
| Grille + Trims | 1.0 | 1.0 | 1.0 |
| Front Indicator | 0.1 | 0.2 | 0.2 |
| Front Fog light | 0.6 | 1.2 | 1.2 |
| Wing Mirror Electric | 0.8 | 1.6 | 1.6 |
| Rear Vent Slats | 0.2 | 0.4 | 0.4 |
| Fuel Filler Cap | |||
Unsprung Weight
Unsprung weight is the components not supported by the suspension (this includes wheels, tyres, brakes and parts of the suspension itself). A certain ammount of driveshafts and track arms are also part of unsprung weight but I havent included those within my calculations.
The following table outlines the weights of items making up the unsprung mass and gives you an idea of how this can be improved. Tyres will vary in mass dependant on size, compounds etc. I have included a named brand tyre and its size as a reference point.
| Component | Weight (KG) |
| Wheel 8j Ronal x4 | 37.2 |
| Dunlop SP9000 Tyres 215/50/15 x4 | |
| Bare Struts x4 | 38.6 |
| Brake Calipers x4 | |
| Brake Discs x4 | 20.6 |
| Hub Units x4 | 6.8 |
| Total |
Weight
Distribution
The Quattro had a natural handling characteristic of understeering when pushed into cornering, this is evidence of the weight distribution in the vehicle and acted as a safety feature. The following page shows how weight is distributed in a standard roadcar and acts as evidence to some of the handling characteristics. It also offers informative data for anyone wishing to do weight saving for track use and balance out some of the corner weight problems.
The standard Weight of a UR Quattro (WR Engined) is 1300kg with fluids. This weight is distributed as follows:
810kg Front
490kg Rear
This equates to a 62% front and 38% rear percentage which is quite a difference. However the rallycars from the Group B days managed to distribute this weight thus balancing it to a better optimum. The final evolution of the SWB cars, the S1 evo, had near 50/50 weight distribution. This was achieved by moving the cooling system and various other components to the rear of the car, however the downside was the car was heavier than its predecessor and the weight was shifted from one extreme to the other.
The following diagram has been compiled by myself and breaks down component weight totals in various locations on a roadcar. The weights are estimated and not 100% accurate as it isnt possible to physically weight sections of a car. The areas are labelled and a list of components in each area is given, cross referencing this with the full weights list given above will allow you to see where weight could be saved or transfered.
Diagram coming soon!
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