Performance Trends Inc
Producing Quality Computer Tools for Racers and Engine Builders since 1986
4-Link Calculator v2.0 (std and Plus version) for Windows XP/Vista/Win 7/Win 8
Computer Program to Simulate and Analyze Rear Suspension 4-Link Setups for Instant Center, Pinion Angle and Driveshaft Angle Change, Anti-Squat %, and More for Drag Racing
Click here for new Plus Version's features.
The 4-Link Calculator lets you input, view, save, analyze and compare your 4-Link rear suspension geometry. You enter heights above the ground and distance ahead of the front axle for up to 6 holes for all 4 brackets for your car, or any number of cars. (Plus version allows for up to 15 holes.) All these measurements are saved in the library for retrieval, analysis or modification in the future. You can also enter other measurements like Wheelbase, Pinion Angle, etc. for more detailed calculations performed by the program.
Once entered, the program will display calculated parameters like Instant Center Length and Height, Anti-Squat %, and changes in Pinion Angle, Driveshaft Angle and Yoke Movement (splines sliding into or out of the transmission yoke) if you have the suspension go through some dynamic changes.
Making changes is just 1 click of the mouse. Click on a bracket hole to change the attachment point, or click on an Instant Center and the program draws the 4-Link setup which produces that instant center.
What is Anti-Squat?
Anti-Squat is an engineering term which describes the 4-Links likely performance under acceleration. 4-Link settings with less than 100% Anti-Squat are likely to squat under hard acceleration (rear of car drops), and "hit the tires more softly". Conversely, settings with more that 100% Anti-Squat tend to raise the rear of the car when accelerating and "hit the tires harder".
The program has several options, including:
The program is compatible with Windows 95, 98, Me, 2000, XP, NT or Vista, which means it is easy to use and you will be able to print the results on most any printer, usually in color if your printer supports it.
The Plus version adds several features to your 4 Link Calculator, including:
Check the pictures below for more information.
Torque Arm Rear Suspension Type
What You Need:
Computer with Windows XP, Vista, Windows 7, Windows 8.
More Information, Download Demo:
to go to our Demo Downloading page to download a FREE 4 Link Demo.
More Information, Watch Demo Movies:
to go to our Demo Movie page to watch 4 Link Demo Movies .
To Order:4 Link Standard: Our DOWNLOAD ONLY option. If you only want the unlocking code and DO NOT want a CD shipped, click on Add to Cart below. You will not be charged shipping.
4 Link Standard: If you want a CD shipped to you, click on Add to Cart below. There will be shipping charges added to your order. You can still download the demo and get your unlock code sooner with this option.
$79.95 plus shipping
4 Link Plus: Our DOWNLOAD ONLY option. If you only want the unlocking code and DO NOT want a CD shipped, click on Add to Cart below. You will not be charged shipping.
4 Link Plus: If you want a CD shipped to you, click on Add to Cart below. There will be shipping charges added to your order. You can still download the demo and get your unlock code sooner with this option.
$129.95 plus shipping
Call 248-473-9230. Visa, MC or Am Exp. Performance Trends can provide you an "unlocking code" number to activate all features (bring it out of demo mode). When newer versions are released, you can download the latest demo and activate all features with this same "unlocking code".
The "on screen" help explains all features, inputs and outputs. This program does not come with a userís manual.