English Bob Smith File Open Open settings file... GRC Settings File (*.grc) That car is not supported by LFS GRC. Try adding it from the Custom Presets panel. Save Save As Save settings file as... Close Exit Tools Custom Presets Options Select Language Language Selection Current language: Select your language: Author: Save && Close Help Manual Full PDF manual available in the same folder as this program Select your car: Info Body Mass: Weight: Weight Distribution: Front Rear Power to weight: Torque to weight: Engine && Drivetrain Power: Torque: Drivetrain: Front Wheel Drive Rear Wheel Drive All Wheel Drive No. of Gears: Efficiency: This graph shows both engine power & torque vs. engine rpm About LFS Gear Ratio Calculator LFS Gear Ratio Calculator v2.5.2 by Bob Smith Compiled with Microsoft Visual Basic 6.0 Made to try and take the guesswork out of gearing Make sure you have the latest version by checking at If you have any comments (improvements, praise, etc) please send me an email at Many thanks to The_Angry_Angel for initial beta testing and feedback, Messiah for helping me fix a region bug and MadmanCZ for the cool gear knob in the logo Wheels && Tyres Rim diameter: Tyre width: Tyre profile: Tyre height: Pressure range: Track: Wheelbase: Gearing Ratios ==> Speeds Speeds ==> Ratios Tyre Type: Road Super Road Normal Hybrid Knobbly Slick Available Graphs/Data: Speed/Torque vs RPM Tractive Effort/Speed vs Time Acceleration Data Table Calculate Speeds from Gear Ratios Final Drive: Gear Ratio Speed Engine Speed... After Before Torque at Wheels 1st 2nd 3rd 4th 5th 6th Reverse rpm Calculate Gear Ratios from Speeds Acceleration This graph shows engine speed vs. car speed for all available gears This graph shows wheel torque vs. wheel rpm for all available gears This graph shows all the forces acting on the car against time This graph shows car speed against time Time Engine RPM Gear Driving Force Resistance Net Force Acceleration F/R Vert. Wheel Loads Speeds have NOT been updated because of the following error(s): The ratio for cannot be shorter than the ratio for Ratios have NOT been updated The speed for cannot be less than that of Tyres Car Speed: Blow Tyres Front tyre pressure: Rear tyre pressure: Analyse Front Tyre Analyse Rear Tyre Graphical Analysis Shape of tyre contact patch: Shape of deformed tyre (side view): Zoom Picture Basic representation of the surface of the rubber in contact with the ground Side view of the tyre showing how deformation affects the rolling radius Numerical Analysis Contact patch width: This is the width of the tyre Contact patch length: This is how long the footprint of the tyre is on the road Contact patch area: This is how much rubber is in contact with the road Contact patch aspect ratio: This is the shape of the tyre footprint on the road. Visualised above. Front/rear contact patch ratio: This shows the relative difference in sizes between the front and rear contact patches Coefficient of Grip (Mu): This affects how much grip the tyre has Tyre stiffness: Tyre frequency: Unloaded tyre radius: Tyre deformation: How much the tyre has deformed vertically under load Tyre rolling radius/circumference: This is the effective rolling radius of the tyre after weight has been placed on the wheel Tyre wall height remaining: Aerodynamics Front Wing Angle: Rear Wing Angle: Speed Selection Slider Speed Top Speed Totals Drag: Lift: Lift/Drag Ratio: Rolling Resistance: Resistance Split: Friction: Misc Info Top Speed: Air Temperature: Air Density: Body Info Frontal Area: Air Drag: Weight Multiple: Force Distribution Info Front Wheels: Rear Wheels: Force Distribution: Aero Distribution: Undertray Info Front Wing Info Rear Wing Info Custom Presets are needed for using GRC with cars created with LFS TweakPro Add a new custom preset Tweak Name: Based on Car: Peak Power: Revs @ Peak Power: Peak Torque: Revs @ Peak Torque: Drivetrain: Number of Gears: Vehicle Mass: Unsprung Mass: Weight Distribution: (front) Front Wheel/Tyre Size: Front Track: Rear Wheel/Tyre Size: Rear Track: Wheel/Tyre Size: Custom Presets used: Load from file Load custom preset... Add Car You cannot give your preset a name that has already been used. You can only add up to 10 custom presets. You must enter a name for your preset. You must select a car for the preset to be based upon. You did not enter a valid power figure. It must be at least 1kW. You did not enter a valid engine speed for peak power. It must be at least 100rpm. You did not enter a valid torque figure. It must be at least 1Nm. You did not enter a valid engine speed for peak torque. It must be at least 100rpm. You must select a drivetrain. You must select the number of gears. You did not enter a valid mass. It must be at least 1kg. You did not enter a valid unsprung mass. It must be at least 1kg. You did not enter a valid weight distribution. It must be at least 5%. You did not enter a valid weight distribution. It must be not be more than 95% You did not enter a coefficient of drag. It must be positive. You did not enter a valid front tyre width. It must be at least 1mm. You did not enter a valid front tyre profile. It must be at least 1%. You did not enter a valid front rim size. It must be at least 1 inch. You did not enter a valid rear tyre width. It must be at least 1mm. You did not enter a valid rear tyre profile. It must be at least 1%. You did not enter a valid rear rim size. It must be at least 1 inch. You did not enter a valid front track width. It must be at least 0.5m. You did not enter a valid rear track width. It must be at least 0.5m. You did not enter a valid wheelbase. It must be at least 0.5m. Added custom preset: Edit existing custom preset Save to file Save custom preset as... Update Updated custom preset: Unit Converter Quick Unit Converter Quickly convert units... Convert Units Distance: Convert Metric Tyre Sizes Customise Gear Ratio Calculator Units Units of Speed: Units of Distance: Units of Area: Units of Pressure: Units of Mass: Units of Force: Units of Stiffness: Units of Acceleration: Units of Power: Units of Torque: Units of Power-to-weight: Units of Torque-to-weight: Meters per Second Kilometers per Hour Miles per Hour Nautical Miles per Hour (Knots) Feet per Second Meters Centimeters Millimeters Inches Feet Square Meters Square Centimeters Square Millimeters Square Inches Square Feet Kilopascals Kilograms per Square Centimeter Bar Atmospheres Pounds per Square Inch Kilograms Tonnes Pounds Slug Tons (Short) Tons (Long) Newtons Sthenes (Kilonewtons) Kiloponds Poundals Pounds-force Sthenes per Meter Pounds per Inch Meters per Second Squared Gal Rate of free fall Feet per Second Squared Inches per Second Squared Kilowatts Horsepower (Metric) Horsepower (Original) Feet Pound-force per Second Newton Meters Kilogram-force Meters Pound-force Feet Pound-force Inches Kilowatts per Tonne Kilograms per Kilowatt Horsepower per Tonne Horsepower per Ton (Short) Horsepower per Ton (Long) Horsepower per Slug Pound per Horsepower Newton Meters per Tonne Newton Meters per Kilogram Pound Feet per Ton (Short) Pound Feet per Ton (Long) Inch Pounds per Slug Inch Pounds per Pound Graphs Speed Plot Options Horizontal Scale: Vertical Scale: Show Peak Power Line Show Peak Torque Line Show Rev Limiter Line Alternate Graph Style Torque Plot Options torque Show Engine Torque Tractive Effort Plot Options Force Show Front/Rear Vertical Tyre Loads Speed vs. Time Graph Options Misc Top / Reverse Gear Max Revs Peak power Redline Rev Limiter Enable Rev Limiter Rev Calculation Automatic Custom Fixed: Performance Options Enable Acceleration Calculations (slow!) Load Options Error: Options.ini does not exist. Save Options