RUF 930 BTR ( Gruppe B Turbo Ruf / Big Turbo R ) Type I / Type II
Japanese 400PS BTR
Road & Track September 1984 World's Fastest Cars Feature ( WINNER )
186.2 MPH
Tuned to replicate RUF BTR
Comfort Hard to Comfort Medium
CAR : RUF BTR '86
Tire : Comfort Hard to Comfort Medium
Specs Type I
Horsepower: 369 HP / 374 PS at 6000 RPM
Torque: 354.4 ft-lb at 5000 RPM
Power Limiter at : 100%
Weight: 1190 kg
Ballast : 145 kg
Ballast Position : 38
Weight Distribution : 38 / 62
Performance Points:
492
Specs Type II
Horsepower: 369 HP / 374 PS at 6000 RPM
Torque: 354.4 ft-lb at 5000 RPM
Power Limiter at : 100%
Weight: 1240 kg
Ballast : 195 kg
Ballast Position : 31 - Optional 32
Weight Distribution : 38 / 62
Performance Points:
489
Specs Type II US Road & Track World's Fastest Cars ( Winner )
Horsepower: 369 HP / 374 PS at 6000 RPM
Torque: 354.4 ft-lb at 5000 RPM
Power Limiter at : 100%
Weight: 1318 kg
Ballast : 143 kg
Ballast Position : 40
Weight Distribution : 38 / 62
Performance Points:
484
Specs 400PS Japanese Market BTR
Horsepower: 395 HP / 400 PS at 5800 RPM
Torque: 390.5 ft-lb at 5000 RPM
Power Limiter at : 97.1% - Install Intake Tuning and Isometric Exhaust Manifold
GT AUTO
NO Oil change
Improve Body Rigidity
( NOT INSTALLED )
Wheels : Standard Size Stock
Car Paint : Red or Black.
Tuning Parts Installed :
Intake Tuning - 400PS ONLY
Isometric Exhaust Manifold - 400PS ONLY
Fully Customizable Suspension
Adjustable LSD
Weight Reduction Stage 3 - 1240kg and 1190kg
Carbon Hood ( Body Color )
Suspension - RUF Tuned Torsion Bar & Bilstein Damper
Front, Rear
Ride Height: 128 128 - OPTIONAL 118 118
Spring Rate: 4.90 8.16 - OPTIONAL Front Spring 4.39, 4.58, 5.44
Dampers (Compression): 6 8
Dampers (Extension): 6 4
Anti-Roll Bars: 3 4
Camber Angle: 1.0 2.0
Toe Angle: -0.10 0.05
DOG CLUTCH TRANSMISSION - RUF CTR 5 Speed with Optional RUF 4.36 Final - OPTIONAL
3rd Gear Corrected
Install all power parts
Set Default
Use Default Final
Set Auto Max Speed at 400kmh / 249mph
Adjust each gear :
1st 2.786
2nd 1.600
3rd 1.115
4th 0.828
5th 0.625
6th 0.596 -
Ignore for authenticity
Set Final
4.360, OPTIONAL Use 4.000 for standard final
LSD - RUF BTR 60% Lock
Initial Torque : 14
Acceleration Sensitivity: 36
Braking Sensitivity: 36
Brake Balance:
6/6 ( personal BB) or for ABS 0 wheel : 6/6, for ABS 1 - feel free to use your preferred brake balance.
Recommended setting for DS3 user :
Steering sensitivity at +1 or +2, all aids off, except ABS 1 ( if not comfortable with ABS 0 ) with 1/2 brake balance as starting point.
Notes :
Based on the Porsche 930 generation, the RUF BTR was the little brother to the CTR. Running single turbo setup, the BTR is still no push over, in 1984 it won the fastest car title given by US magazine Road & Track.
Suspension spring rate are based on various ratio used on different 930 and 964 models, the base is 4.9kg/mm front and 8.16kg/mm rear. This should give easier to drive balance, if you want more lively handling and more eager front end, use lower front rate 4.39 or 4.58 
Stock gearbox is good, but I also provide optional final drive ratio 4.36 setup which also offered by RUF.
LSD is standard spec RUF 60% lock.
The base tire is Comfort Hard, it drives the best on this tire IMO, but you can fit Comfort Medium too if wished. Tested at various tracks like Silverstone, Brands Hatch, Apricot Hill Reverse, and Rome.