SusProg3D - Suspension by Design.
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Windows 10 and Windows 11
The preferred minimum OS is Windows 10 Creators Update Version 1703 Build 15063
Released March 2017
Version 5.152D (Build 1698.3)
Updates and fixes in this release.
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Version 5.152D (Build 1698.3)
Changed the rear suspension default wheel alignment setting to "Inclination".
When opening older data files, added a warning message to check rear suspension
alignment settings.
Version 5.152C (Build 1698.2)
If open, the Instant Centres dialog didn't refresh with correct values after a
Steering calculation. Fixed.
Version 5.152B (Build 1698.1)
Some older data files did not open correctly. Corrected the file read DLLs.
Version 5.152A (Build 1698.0)
Updated the Alignment input to allow for specifying "Caster" or "Inclination"
(where applicable).
Updated and corrected all the geometry calculations for uprights with one or two
swivels.
Add the kingpin upright style for the old type knuckle/kingpin/upright design.
Version 5.150F (Build 1689.5)
For the trailing arm and 3 link rear suspension, the trailing arm chassis mount
offset didn't save. Fixed.
Version 5.150E (Build 1689.4)
Added back the steering options for rear suspension types that had the option
deleted.
Version 5.150D (Build 1689.3)
Fixed the antirollbar link orientation.
Added back the steering options for rear suspension types that had the option
deleted.
Version 5.150C (Build 1686.2)
Updated and fixed the graphic print function.
Version 5.150B (Build 1682.1)
Updated the graphic display of the undertray, chassis datum, track surface and
wheel for transparency.
Added a torsion bar option for strut suspension.
Version 5.150A (Build 1677.0)
Changed the wheel alignment terminolgy for rear suspensions. "Inclination" is
now used instead of "Caster".
Added the "Dual axis strut" as used by some Renault and Honda vehicles.
Updated the centre link steering to allow for the tie rods to be connected above
or below the centre link.
Corrected a bug which caused an exception when closing the shock and spring
chassis input dialog for live axle.
Updated the upright ISO Graphic to display correctly when not using the default
SusProg3D axis system.
Updated various input dialogs to correct the tab sequence.
Updated the antiroll bar inputs to consolidate the link length data into the
main antirollbar input dialog.
Updated the Excel export functions to export the spring and arb rates (in
addition to the wheel rates).
On a technical note, the functions to read a data file have been updated to use
heap instead of stack memory.
Version 5.142G (Build 1640.6)
Corrected a bug in the geometry alignment calculations with lower A-arms.
Version 5.142F (Build 1640.5)
Corrected a bug in the geometry alignment calculations with virtual lower
A-arms.
Version 5.142E (Build 1640.4)
Corrected a bug in the torsion bar calculations to allow for zero load.
Updated the spring and shock results to include all motion ratios even if the
wheel rate is zero.
Version 5.142D (Build 1640.3)
Added an inverted H-arm geometry with the H-arm as the upper links and the
camber link as the lower link.
Version 5.142C (Build 1640.2)
Updated various input dialogs to correct the tab sequence.
Corrected the Spring,Shock,Arb Chassis and Susp inputs to redisplay correctly
after using "Apply"
Version 5.142B (Build 1640.1)
Corrected a bug in the tyre parameter calculation.
Version 5.142A (Build 1640.0)
Continued development of the TTrailingArm3Links geometry calculations.
Added the side view instant centre line from hub centre through IC point as some
of the “anti” calculations use the line from hub centre and others use the line
from wheel contact centre.
Updated the “Chassis mounts + trailing arm + wheel alignment” and make it
consistent across both 2 & 3 link types.
Updated the Jaguar, HArm and Porsche928 geometry calculations when specifying
swing axle lengths and instant centres.
Updated the upright/strut/trailing arm graphic and added a side view graphic and
to correctly scale the contents and identify the king pin and strut axis
regions.
Updated the Excel functions error reporting to better identify the cell range in
error.
Updated the Excel export functions to export the file name and file version.
Version 5.140H (Build 1625.7)
Corrected the suspension link calculations to correctly handle calculating the
square root of a negative number rather than causing a calculation failure.
Version 5.140G (Build 1625.6)
Updated all the Geometry -> Upright and Geometry -> Strut inputs with updated
captions, fixed the graphic display when using inch measurements, and deleted
the input for the sprindle reference.
Version 5.140F (Build 1625.5)
Updated all the FileRead DLLs to link through the portal axle data.
Updated the CAD2Susprog tool to correctly show the spindle length.
Version 5.140E (Build 1625.4)
Updated the Results and enabled selection (Ctrl-A) and copy (Ctrl-C)
functionality.
Corrected the axis display to clearly show when the data file axis differed from
the current settings.
Added a "Point to line" function to the Tools -> Misc to check if three points
are co-linear.
Updated the CAD2Susprog tool to correctly show the item captions and defaulted
all numeric inputs to use the number of decimal places setting.
Version 5.140D (Build 1625.3)
If the coil spring data was invalid then the spring dialog would hang
(attempting to draw an infinite spring).
Now, if the coil spring data data is invalid then the graph page will display an
error message.
Version 5.140C (Build 1625.2)
The registration form was missing the Request button. Fixed.
Version 5.140B (Build 1625.1)
Corrected the live axle chassis and links input dialogs that defaulted all
values to zero.
Corrected the coil spring input dialog to save the opposite side spring when
symmetric.
Version 5.140A (Build 1625.0)
GUI updated to support display scale settings 125% to 200%
Version 5.132D (Build 1581.3)
Updated the Mustang caster link calculations to support the 2020 Mustang Shelby
GT500
Version 5.132C (Build 1581.2)
Updated the trailing arm calculations to support the Kia Carnival rear
suspension.
Version 5.132B (Build 1580.1)
Updated the display of trailing arm to draw a line representation.
Updated the display of trailing arm types that use an additional toe control
link to draw the toe link.
Updated the trailing arm calculations to support the Kia Carnival rear
suspension.
Version 5.132A (Build 1576.0)
Renamed the CMM utility to CAD2SusProg and added additional inputs and
calculations.
Added a display option to orient the view along the steering gear axis.
Updated ECalc to include the appropriate calculations.
Corrected the results output for the bellcrank rotation angle.
Added to the wheel and tyre input to allow for individual mounting offset
definitions.
Version 5.130E (Build 1564.4)
Added the Pitman arm steering (go-kart style) for all A-arm and Strut
suspensions.
Version 5.130D (Build 1564.3)
Fixed the antirollbar link length bug.
Fixed the display of invalid driveshaft and shockabsorber artifacts.
Fixed the input of the lateral link coordinates for trailing arm with lateral
links.
Version 5.130C (Build 1564.2)
Fixed the live axle roll centre calculation bug.
Version 5.130B (Build 1564.1)
Fixed the setting brake and torque distribution bug.
Fixed the rear geometry wheel location and alignment bug.
Version 5.130A (Build 1564.0)
Added the option to specify the steering turn angle using steering wheel
rotation.
Version 5.125M (Build 1531.12)
Fixed the "ExcelApplication Access violation" bug.
Version 5.125L (Build 1531.11)
Fixed the "Ancestor for ExcelApplication not found" bug.
Version 5.125K (Build 1531.10)
Added rectangular section springs and rearranged the coil spring input form.
Changed the sequence the various results data is collated.
Update the strut input form to better identify the strut-knuckle pivot and
adjustment bolts.
Version 5.125E (Build 1531.4)
Updated the struts to allow for the strut-knuckle pivot bolt to be either upper
or lower.
Fixed a bug that caused a helper spring to have the wrong type of end style and
coil count.
Updated drawing the helper spring to change the colour to red when solid.
Fixed a bug that incorrectly calculated the body spring seat dimension when
calculating the spring for any option except "Calculated".
Version 5.125D (Build 1531.3)
Fixed a bug that prevented entering anti-roll bar chassis mounting coordinates.
Version 5.125C (Build 1531.2)
Added additional toe link actuated suspension items
Version 5.125B (Build 1531.1)
Updated About to identify Windows 11 Version 22H2
Fixed a bug that sometimes caused an exception when reading the SusProg3D
settings
Fixed a heading text error in the toeout in turn results
Fixed a bug that corrupted the Ford Twin I-Beam steering input
Version 5.125A (Build 1531.0)
Added an extra Geometry Configuration option for all suspension and steering
linkages.
Added the steering wheel rotation to the Excel exports for ToeOutInTurn data
Version 5.124A (Build 1525.0)
Added a new live axle bellcrank anti-roll bar configuration
Version 5.124A (Build 1520.0)
A new Excel group tab added
Added new A-arm config and dimensioning functions
Fixed a bug displaying large numbers (-1E6 > values > 1E6)
Added extra validation in the CMM tool for spindle coordinates
Added extra validation for live axle link lengths
Added the depiction of the track surface to the graphic.
Added alternative Excel range name prefix, 'SPG'
This is the last available 32-bit version.
It is provided strictly on a "as is" basis.
There are no further support, bug fixes or enhancements for the 32-bit version.
Version 5.122C (Build 1494.2)
Fixed a bug in the recirculating ball type steering gear input form.
Version 5.122B (Build 1492.1)
Fixed a bug that sometimes caused the evaluation version to hang if opening a
data file created with a registered version.
Fixed the "Ancestor for ExcelApplication1 not found" error.
Fixed the licence server registration interface to persist the host and port
data.
Version 5.122A (Build 1488.0)
Updated the threaded calculations to use task manager.
Updated the calculation threads to pass errors back to the main thread.
Updated the Excel interface with additional error reporting.
Updated the registration interface with additional error reporting.
Version 5.120F (Build 1482.5)
Fixed a bug calculating caster with an upper A-arm and a lower "virtual" A-arm.
Version 5.120E (Build 1482.4)
Fixed a bug in the Delphi IDE that caused some dialogs to not open correctly.
Version 5.120D (Build 1482.3)
Fixed a bug in the trailing arm with lateral links geometry calculation.
Version 5.120C (Build 1482.2)
Corrected a compiler bug with Excel2Input and Excel2CMM
Version 5.120B (Build 1482.1)
Corrected a bug in eCalc and vCalc
Corrected the terminology in Dynamic Results from 'Roll couple distribution' to
'Roll stiffness distribution'
Version 5.120A (Build 1481.0)
Updated About to identify Windows 11
All calculations now performed in a dedicated CPU thread
Extended the caster calculation limit from 0.5R to 0.8R (28.6 degrees to 45.8
degrees)
Version 5.118B (Build 1469.1)
Asymmetric Watts linkage now allows for non-optimum orientation
Fixed the bug that caused the ExcelExport to only export a single value
Version 5.118A (Build 1466.0)
Mumford links are now full asymmetric.
Watts links are now full asymmetric.
Updated the Upright, Strut, Trailing Arm and Axle input dialogs and updated the
graphic.
Replaced the CHM format help file with eWriter help file.
Added a "Stacked" option to the Display Control.
Refactored the MonoWheel code to improve performance.
Added a Cascade option for all open inputs.
Added an option to view the bellcrank centred in the screen viewing along the
bellcrank axis.
Fixed a few instances where the font size didn't scale correctly on hi dpi
devices.
Version 5.114C (Build 1433.2)
In the Spring dialog, changing the wheel rate didn't always "stick". Fixed.
Version 5.114B (Build 1433.1)
The steering gear input form had a data display corruption when using Styles.
Fixed.
Version 5.114A (Build 1431.0)
Added Chapman strut.
Updated the strut instant centre calculations.
Version 5.112B (Build 1420.1)
Updated the bump steer calculation for struts.
Version 5.112A (Build 1418.0)
Added additional validation when using shock lengths to limit wheel travel.
Extended the Jacobs ladder to allow for multiple birdcage holes and unequal
length sides.
If the torsion bar calculation fails, then show the position of the torsion bar
with a dash line.
Version 5.110A (Build 1415.0)
Updated the CMM tool and added a caster rotation input.
Added an option to allow metric dimensions to 3 decimal places and inch
dimensions to 4 decimal places.
Updated the axis setting input to enable changing the axis sequence.
Updated all inputs that have tabs and highlighted the active tab.
Fixed the corrupted help file topics when using styles.
Version 5.108B (Build 1399.1)
Corrected the travel calculations when using shock lengths and bellcranks.
Corrected the CMM tool to update both LH and RH tyre radius if symmetrical.
Corrected the turning radius and turning circle calculations to allow for larger
king pin offsets.
Version 5.108A (Build 1399.0)
Updated and corrected the anti-roll bar rate calculations.
References used are the SAE Spring Design Manual and Chassis Design Principles
and Analysis.
Updated and extended the travel calculations when using shock lengths.
Corrected the front suspension caster calculation for virtual A-arms.
Updated to the latest Delphi 10.4.2 Sydney compiler.
Version 5.106E (Build 1393.4)
The coil spring calculator tool sometimes corrupted data when switching between
Metric and Imperial units. Fixed.
Version 5.106D (Build 1386.3)
The coil spring calculator tool didn't read all specified inputs. Fixed.
Version 5.106C (Build 1386.2)
When using inch dimensions the ride height input showed 2 decimal places instead
of 3. Fixed.
Corrected a rear suspension caster calculation error in the CMM tool.
Version 5.106B (Build 1383.1)
Corrected the spring seat dimension when specifying the spring free length.
Added the units to the rates section of the antirollbar input form.
Version 5.106A (Build 1380.0)
Updated all the Excel interface tools.
Individual worksheet names can now be specified for front and rear, left and
right.
Specified worksheet names are now read from, and saved back to, the workbook.
The Excel tools can now interface with VCalc and read and write the complete
vehicle.
Added a workaround to support a 3-link live axle with a single bottom link
(undocumented).
Version 5.104B (Build 1370.1)
Fixed a bug with the suspension dialog that sometimes prevented the LH/RH
symmetrical checkbox showing.
Corrected a bug that incorrectly assigned the AllWheelDrive property.
Version 5.104A (Build 1367.0)
Added the bellcrank antirollbar for 4-link live axle.
Fixed the "Invalid variant type" and "Range check error" bug in Calc2Excel.
Included both input and calculated wheel alignment and instant centre data in
the geometry results.
Added the driveshaft calculations in roll for deDion axles.
Corrected the anti-squat calculations for deDion axles.
Version 5.102B (Build 1356.1)
Add a lower link shock absorber for trailing arm and lateral link geometry.
Fixed the OfficeXPrt270.bpl load error.
Version 5.102A (Build 1355.0)
Revised the trailing arm with upper and lower lateral links wheel alignment and
instant centre calculation for improved accuracy and performance.
Updated to the latest Delphi 10.4.1 Sydney compiler.
Version 5.100C (Build 1353.2)
Recompiled to exclude testing Assertions
Fixed a bug preventing the opening of a data file with a leaf spring
Version 5.100B (Build 1352.1)
With a new file, setting the ride heights failed. Fixed
Switching the spring units (N/mm <> lb/in) corrupted the wheel rates. Fixed
Specifying a spring rate didn't back calculate the wheel rate and frequency.
Fixed
Version 5.100A (Build 1350.0)
SusProg3D now available in 64-bit.
For all supported versions of Windows 64-bit.
A small performance improvement has been found compared to the 32-bit version.
Added the functionality to input parameters to generate a 4th order
polynomial to calculate the tyre radius and the contact patch centroid offset.
The required parameters are the tyre radius and contact patch centroid offset at
zero camber, static camber and maximum camber.
Added a stop ring for primary and secondary coil springs. The position of the
stop ring controls the transition point from the initial spring rate to the
final spring rate.
Changed the spring calculation to use frequency or wheel rate to calculate the
spring rate.
Removed an unnecessary Calc button and combined the spring calculation into the
usual Apply button.
Excel input and output now include all four ride heights and reference
points.
Previously if you were working with the front or rear suspension, then only the
ride heights and reference points for that end were included. Now both ends are
included.
Excel output now allows for specifying separate bump and droop, roll and turn
sections.
Previously all data was in one section. This now makes it easier to export just
the sections of interest.
When specifying a front suspension with both top and bottom A-arms with
"virtual pivots", the calculated and specified caster can differ by a small
amount.
To correct this, adjust the entered caster until the calculated caster equals
the required caster.
Using File | New caused an exception. Fixed.
Feedback.
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Your suggestions and comments are appreciated.
Email to Support@SusProg.com
Please include the version and build number (in the SusProg3D About box) and
operating system.