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, June 2024

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1) Roll Center 4.0 Plus Bug Fixed  We ran into a bug in the Plus version of Roll Center Calculator, v4.0.  If you made a change to either the front or rear suspension, the Handling Rating on the main screen did not always update.  Now we've added a button so you can force the Handling Rating to update, as shown in the picture below. 

If you own the Roll Center Plus v4.0, we strongly recommend you download and install this newest version, v4.0 A.021, a free update.  This is not critical, but when asked, select to do a Refresh installation instead of a Complete (typical) installation to keep all your settings.  Either way, all your vehicle files are saved.

click here to install v4.0 A.021

If you have an older v3.6 or earlier of Roll Center Calculator or Circle Track Analyzer, the v4.0 has been available for about 3 years.  Here's a list of the main new features present in all programs, Roll Center and Circle Track:

• 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

Bump Springs picture from User Manual

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

More Calculated Data Results and Writing ASCII files picture from User Manual

for info on our new Roll Center Calculator standard and Plus v4.0.

for info on our new Circle Track Analyzer standard and Plus v4.0.

for detailed PDF on all these new features.

The new pricing of these program updates and possible upgrades are listed below:

If you own one of these programs now, you can purchase an update to a newer version of the same program per the table below:

The table below shows how much discount you get upgrading and/or updating to a more advanced version:

So, if you own standard Circle Track Analyzer v3.2 and want to update to Circle Track Analyzer v4.0, it would be $125.00.  If you own standard Roll Center Calculator v3.6 and want to update and upgrade to Circle Track Analyzer Plus, it would be $319.95 - $55 discount, or $264.95.

to send us and email to explain your options for updating and upgrading if this is confusing (and I can see it would be).  Tell us what you own and what you would like to get.

for pricing of these and all our software products.

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