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Enhancement of a Vintage Muscle Car’s Suspension. Jonathan Hoffman Advisor: Professor Bucinell. http://www.globalwest.net/. Background. ‘Muscle’ car era- 1960’s to early 1970’s Produced heavy cars with significant power Other car characteristics were overlooked. - PowerPoint PPT Presentation
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Enhancement of a Vintage Muscle Car’s SuspensionJonathan Hoffman
Advisor: Professor Bucinell http://www.globalwest.net/
Background ‘Muscle’ car era- 1960’s to early 1970’s
Produced heavy cars with significant power Other car characteristics were overlooked
http://www.matchboxcars.com/
1969 Chevrolet Camaro
Legendary champion in SCCA Trans-Am Series Won 10 of 12 1968 races and championship Won 6 of 12 1969 races and championship
http://www.penske.com/
http://www.superchevy.com/
Project Objective Bring the suspension system up to
modern standards 35 years of technology
Enhanced Suspension Improved handling capabilities Without sacrificing ride quality
http://www.chrysler.com/
Sources of improvement Poor A-arm geometry
Excessive positive camber gain Small front sway bar
Minimal roll resistance Tall springs
High center of gravity Antiquated shocks
Poor ride quality
http://www.globalwest.net/
Suspension Alternatives
MacPherson strut Pros: Inexpensive, compact Cons: High mounting height
required, moderate handling
Double A-arm (Wishbone) Pros: Rigid, greatest handling
performance Cons: Costly, space engaging
http://www.autozine.com/
Excessive Positive Camber Gain Outside tire loses contact with ground
during cornering
Caused by poor A-arm geometry
http://www.chevyhiperformance.com/
Decision MatrixOption 1 Option 2 Option 3 Option 4 Option 5 Option 6 Option 7
Design Criteria
Redesigned UpperA-arm
Redesigned Upper
A-arm w/ remounting
Option 1 with
Shocks, sway
Option 3 with
lowered springs
Option 2 with
Shocks, sway
Option 5 with
lowered springs
New shocks,springs,
sway
10Performance Enhancement 7 7.5 8 9 8.5 9.5 5
weighted score 70 75 80 90 85 95 50
9Required Modification 9 5 8 7 4 2 10
weighted score 81 45 72 63 36 18 90
8 Ride Quality 7 7 8 7.5 8 7.5 8
weighted score 56 56 64 60 64 60 64
7 Cost 10 8 7 6 5.5 5 7
weighted score 70 56 49 42 38.5 35 49
Totals: 277 232 265 255 223.5 208 253
Suspension Modeling Software
WinGeo3
Effects of changes in camber, toe, scrub, roll center, etc.
http://www.mitchellsoftware.com/
Remaining Tasks
Analyze alternatives with software Define final design Manufacture final design Before / after performance testing
http://www.hotrod.com
Questions / Acknowledgements
? Professor Bucinell William C. Mitchell