Performance Trends, Inc.

Producing Quality Computer Tools for Racers and Engine Builders since 1986

Re: Performance Trends Newsletter (updates)

To: Visitors to Performance Trends Website

Subject: Product News/Updates, March 2026

to visit our www.performancetrends.com home page

to visit our    facebook page and "like" us.

for our full You Tube channel

-------------------------------------------

1)  Circle Track Analyzer/Roll Center Calculator v4.0  Racing season is coming up fast, and you may want to consider some setup software for your circle track car.  A few years ago, we released major updates to our Roll Center Calculator and Circle Track Analyzer line of programs.  Our popular Roll Center Calculators are the same program as Circle Track Analyzer, just with some major features disabled (hidden).  In addition to new features, we developed a Circle Track Analyzer Plus, with several even more advanced features.  So now there are 4 versions:

• Roll Center Calculator (front suspension screen only)  PN RC40, $119.95
• Roll Center Calculator Plus (front and rear suspension screens, with handling analysis)  PN RC40+, $169.95
• Circle Track Analyzer, all screens including Engine power curve, Track Layout, and more detailed vehicle specs  PN CTA40, $219.95
• Circle Track Analyzer Plus, all Circle Track Analyzer screens, but including more detailed Shock Absorber inputs,  Spring Travel limits, 28 more data outputs, and more   PN CTA40+, $319.95

The main, new features present in all programs (Roll Center and Circle Track) include:

• More accurate, more realistic Force Based Roll Centers. You can select to use or compare to the previous Kinematic Roll Center if you want.  See picture below.
• You can enter Bump Spring details and watch their effects on spring forces.
• You can enter Ride Height details and watch Ride Height change through dive, roll and squat.  See picture below.
• Greatly improved calculation utilities for Roll Bar Rates.  See picture below.
• The program lets you watch how much ball joint angle changes on the front suspension so you can see where ball joint bind may be a problem.  See picture below.
• You can include picture files which are displayed on the screen, and you can include in your printouts.

New Force Based Roll Center picture from User Manual

More Detailed Roll Bar Calculator picture from User Manual
  click image to enlarge   

Bump Springs picture from User Manual
  click image to enlarge

The full Circle Track Analyzer v4.0 has these new features

• There are many new outputs which are listed in the results and which can be graphed, like Camber, Dive, Roll, Squat, Scrub, Ball Joint angle change, Oversteer/Understeer Factor and more.
• You can include picture files which are displayed on the screen, and you can include in your printouts.
• You can graph up to 4 different data types vs time or position on the track. You can also do overlay (comparison) graphs for up to 6 different tests. You can also include segment lines on the graph to show, say, start of Turn 1, Turn 2, Back Straight, etc.
• You can save and recall templates of various sets of graphing settings for easy changing of the graphs in the future.
• Much more
  

The Circle Track Analyzer v4.0 Plus has these new features:

• The results include more calculated results as the car goes around the track, including:

                LF Tire Force             RF Tire Force
                LR Tire Force             RR Tire Force
                Total Tire Force         LF Bump at Tire
                RF Bump at Tire         LR Bump at Tire
                RR Bump at Tire         LF Spring Force
                RF Spring Force          LR Spring Force
                RR Spring Force          LF Shock Force
                RF Shock Force          LR Shock Force
                RR Shock Force          LF Shock Vel
                RF Shock Vel              LR Shock Vel
                RR Shock Vel              LF Ride Ht
                RF Ride Ht                 F Aero Downforce
                R Aero Downforce      Change CG Ht
                L Bump Force             R Bump Force

• You can enter more details about the spring travel limits and the shock absorber performance.  You can also enter complete shock dyno curves for each shock absorber.  If you have the Performance Trends Shock Dyno, or our software on a retro-fit kit, you can automatically import dyno curves into the software.

• You can export calculated data as .csv or other format ASCII files for use in other software, like Microsoft Excel (tm).

• Because there is so much data displayed in the results, there is a "View" option where you can select just which data you want displayed.  You can save and recall "templates" of these settings for easily changing Viewing options.  

• You can include a company logo graphics file and 2 customizable lines of text at the top of your printouts.

Detailed Shock Dyno Data picture from User Manual
  click image to enlarge   

More Calculated Data Results and Writing ASCII files picture from User Manual
  click image to enlarge