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 v2.5.3 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 <www.thefloatingwidget.net>
If you have any comments (improvements, praise, etc) please send me an email at <bobsmith@mrnl.net>
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:
Engine Speed at Peak Power:
Peak Torque:
Engine Speed at Peak Torque:
Engine Speed at Idle:
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.
The engine idle speed must be at least 100rpm.
The engine idle speed cannot be more than one third of the engine speed for peak power.
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