Here is an analysis of the “stock” Goblin suspension ride and roll rates, meant to be a baseline resource for anyone interested.
General:
Weight - 1640lbs
Wheelbase – 97.25in
Tires – Stock LNF SS 225/40R18
Front Weight Distribution - 36%
CG Height – 20.5in
Roll Stiffness - 2.7°/G
Front Setup:
Track Width – 59.4in
Roll Center Height - 3.8in
ARB - None
Spring Rate - 400lbs/in
Motion Ratio - 0.62
Wheel Rate - 155lbs/in
Frequency - 2.60Hz/156cpm
Front Roll Rate - 332ft-lbs/°
Front Roll Rate Distribution - 36.5%
Front Total Lateral Load Transfer Distribution (TLLTD) - 38.5%
Rear Setup:
Track Width – 58.3in
Roll Center Height - 1.6in
ARB - None
Spring Rate - 300lb/in
Motion Ratio - 0.97
Wheel Rate - 281lbs/in
Frequency - 2.56Hz/154cpm
Rear Roll Rate - 579ft-lbs/°
Steady State Weight Transfer:
The image above is a graphical representation of the steady state lateral load transfer in a corner with a lateral acceleration of 1G. The red circles represent the vertical load on the tires.
The green line represents the front TLLTD. If the front TLLTD is greater than the front weight distribution, it will contribute to understeer/push. If the front TLLTD is less than the front weight distribution, it will contribute to oversteer/spin. There are many factors that contribute to the overall balance of the car, and this is just one of them.
The Goblin's front TLLTD is 2.5% higher than it's front weight distribution, which contributes a small amount of understeer/push.
Ride Rate Notes:
The Goblin's ride frequencies are quite high. For reference, typical non-aero cars range from 1.6 to 2.0Hz and aero cars range from 3 to 5Hz.
Roll Notes:
The Goblin's 2.7°/G roll stiffness is in the typical range for high performance road and track cars.
At approximately 1G lateral acceleration, the front inside wheel will be at full droop. Higher accelerations will result in the tire coming off the ground.
If there are any questions or other graphs of interest let me know and I’ll get them added.
General:
Weight - 1640lbs
Wheelbase – 97.25in
Tires – Stock LNF SS 225/40R18
Front Weight Distribution - 36%
CG Height – 20.5in
Roll Stiffness - 2.7°/G
Front Setup:
Track Width – 59.4in
Roll Center Height - 3.8in
ARB - None
Spring Rate - 400lbs/in
Motion Ratio - 0.62
Wheel Rate - 155lbs/in
Frequency - 2.60Hz/156cpm
Front Roll Rate - 332ft-lbs/°
Front Roll Rate Distribution - 36.5%
Front Total Lateral Load Transfer Distribution (TLLTD) - 38.5%
Rear Setup:
Track Width – 58.3in
Roll Center Height - 1.6in
ARB - None
Spring Rate - 300lb/in
Motion Ratio - 0.97
Wheel Rate - 281lbs/in
Frequency - 2.56Hz/154cpm
Rear Roll Rate - 579ft-lbs/°
Steady State Weight Transfer:
The image above is a graphical representation of the steady state lateral load transfer in a corner with a lateral acceleration of 1G. The red circles represent the vertical load on the tires.
The green line represents the front TLLTD. If the front TLLTD is greater than the front weight distribution, it will contribute to understeer/push. If the front TLLTD is less than the front weight distribution, it will contribute to oversteer/spin. There are many factors that contribute to the overall balance of the car, and this is just one of them.
The Goblin's front TLLTD is 2.5% higher than it's front weight distribution, which contributes a small amount of understeer/push.
Ride Rate Notes:
The Goblin's ride frequencies are quite high. For reference, typical non-aero cars range from 1.6 to 2.0Hz and aero cars range from 3 to 5Hz.
Roll Notes:
The Goblin's 2.7°/G roll stiffness is in the typical range for high performance road and track cars.
At approximately 1G lateral acceleration, the front inside wheel will be at full droop. Higher accelerations will result in the tire coming off the ground.
If there are any questions or other graphs of interest let me know and I’ll get them added.
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