This software was primarily designed to model a double wishbone IRS setup but it can be used to model front suspension as long as the top and bottom wishbones are approximately parallel. The error introduced by 1 or 2 degrees of inclination of the top wishbone for anti dive will probably not affect the results. The dimensions are supplied to the program as a separate text file called DIMS.TXT. This file must be in the same directory as the program. The program only recognises lines that start with a number, all other lines are ignored. Everything on the line after the number is ignored. This allows you to keep a record of the values you have used Have a look at the file provided, which is contains dimensions for standard locost front suspension fitted with Ford Sierra alloys and 195/60 R14 tyres. The dimensions are in millimetres. The program calculates the distance between the top balljoint and the top chassis pivot for the given camber and droop. It then shows an animation of the suspension moving from max droop to max bump and back. The blue curve shows the movement of the bottom balljoint, the red curve shows the movement of the top of the wheel and the green curve shows the movement of the bottom of the wheel. Press the spacebar to stop the animation, any key to restart it. Pressing any other key while the animation is running will stop the program. The program can be used to calculate bump steer by relocating the axle centre line to the centre line of the track rod end and using the diff joint coordinates as the rack pivot point coordinates. The program will then calculate the deflection if the track rod over the suspension travel range (driveshaft length). If you want to know the angle that the wheel turns by, you will have to work it out from the track rod deflection and the distance from the king pin axis to the track rod end. However, as all we are trying to do is minimise bump steer you can play around with the rack positioning to get the minimum deflection of the track rod without having to worry about the actual angle through which the wheel turns. The file Dims2.txt contains the values I have used to find the theoretical ideal position for the rack if a rack could be made to suit. Due to the fact that we cannot make our own racks (don't tell me - someone is making one) we can only play with the vertical positioning if the rack. This software is freeware and may be distributed at no cost as long as it is distributed with the accompanying files. I take no responsibility if this program comes up with the wrong numbers or does something nasty to your machine. However, If you find any bugs in the program, or have any HELPFUL suggestions then let me know by posting a message on the Locost mailing list. File list: ReadMe.txt - this file dims.txt - demonstration dimensions for standard locost dims2.txt - demonstration dimensions for bump steer Susp.exe - Suspension modelling program egavga.bgi - Borland TurboC VGA display driver System requirements: 286 or better processor VGA display