SpeedCalc calculates vehicle speed data for cars (2 or 4 wheel drive) and motorbikes. All that is required are the gear ratios of the gearbox and final drive and the circumference of the driven tyre. All the data you input can be saved allowing you to quickly reload details for your motorbike/car and see what effect a new wheel/tyre combination, diff ratios etc. would have.
SpeedCalc is a 32 bit Windows application that will run on Win9x, NT4, Win2000 and Windows XP platforms.
SpeedCalc provides the following features given gear ratios, final drive/diff ratios and tyre data:-
Menu buttons
Save
Saves the gearbox and tyre data. If you want to add a new tyre or gearbox change the description and a new record will be created for it. If you don't change the description then the old record is overwritten.Print Performance Data
Prints all the data currently displayed in the Performance Data window.Plot performance Data
Displays the performance data as a Speed/RPM graph for each gear. The graph can display upto 10 sets of data. The speed units of the graph are relative to the currently selected speed units on the menu bar MPH or KPH.Exit
Exit SpeedCalc..
Calculate
Calculates performance data given that at least 1 gear ratio, tyre circumference and the diff ratios have been initialised. The performance data is output in the Performance Data window, pressing calculate subsequent times appends the new data to the end of the list, allowing you for example to generated data for a gearbox with different tyre combinations.
Clear Gearbox/Tyre Data
Clears and resets all the data input boxes for both the gearbox and the tyre data.Clear Calculated Performance Data
Clears all data from the Performance Data window.
User Guide
Displays this user guide!
About SpeedCalc
Displays the About dialog listing version number, copyright and contact information.
Gearbox Data
Description
Fill this in if you want to save the gearbox data so you don't have to re-enter it next time you want to use it. Once saved just reselect it from the drop down list. If you want to add a new gearbox change the description and a new record will be created for it. If you don't change the description then the old record is overwritten with any new data when a save is done.Change RPM
This is the engine speed that the maximum speed per gear is calculated at, i.e. the gear change RPM.Gear Ratios
You can enter any number upto a maximum of 6. You need a minimum of 1 gear ratio entered; the ones you don't need leave blank. If you are entering a diff ratio, the gear ratios shouldn't include the diff ratio factored into them, as it is in a lot of manuals.Centre Diff/Drop Gear - Ratio
This is the centre diff ratio on 4 X 4's, the drop gear ratio for engines such as A series or the drive ratio from crank to clutch basket on motorbikes.
If you don't need a Centre Diff/Drop Gear ratio set it to 1.Diff/Final Drive
This is the final drive diff ratio in a car or the final drive sprocket ratio on a motorbike. If you know the ratio enter it in the Ratio box, if not leave it blank and use the Small/Sprocket Gear and Large/Sprocket Gear input boxes instead. This is the easiest way if you know how many teeth are on the crownwheel and pinion or the gearbox and rear sprockets on a motorbike. Effectively it calculates the ratio for you, allowing you to quickly change the ratio for comparison, very useful on a motorbike.
If you don't need a Diff/Final Drive ratio set it to 1.
Tyre Data
Description
Fill this in if you want to save the tyre data so you don't have to re-enter it next time you want to use it. Once saved just reselect it from the drop down list. If you want to add a new tyre change the description and a new record will be created for it. If you don't change the description then the old record is overwritten with any new data when a save is done.Tyre Circumference
The circumference of the driven wheel should be in millimetres.
Trip Meter
Trip Meter Ratio
Allows you to quickly set the trip meter on a rally car, without having to drive a measured mile. Enter the ratio of pulses/rev from the trip meter sensor, e.g. if the sensor picks up off the 4 wheel studs, the ratio is 0.25 (1 wheel revolution divided by 4 wheel studs).
Leave blank if not required.Tyre Revs/Mile/KM and Trip Meter Revs/Mile/KM
These values are calculated for you.
"Tyre Revs/Mile/KM" is the number of revolutions the wheel will do in 1 mile/KM.
The "Trip Meter Revs/Mile/KM" value is the one you enter in your trip meter as the calibration value.
The performance plots show data as a Speed/RPM graph for each gear. The graph can display upto 10 sets of data. The speed units of the graph are the same as the currently selected speed units on the menu bar, MPH or KPH.
In the example below the same gearbox data has been used but with two different tyre sizes.
Copy
Copies the performance plot to the clipboard.Save
Saves the performance plot as a JPEG or bitmap file.
Prints the performance plot.Exit
Exit the performance plot screen.
| BoRis | |
| Web site :- | http://www.tuggly.co.uk |
| Email :- | chris@tuggly.co.uk |
SpeedCalc Copyright (C) 1998 - 2002 Chris Cunnington