Suspension (ride height)

[bennyill]

i always slam the car to it's lowest point, seems to always work for the car, every car i have handles pretty good jus by doing this

the question i have is by doing this what should my Spring Rates be and Shock (bound and Rebounds)

 

[Ske]

Hard. Fine tuning the rates is up to the car and user pref.

 

[bennyill]

i know but what i mean is if the height is low then the spring rates are what ? like what do they mean if i put the value higher? the spring is stiffer or not ? im not sure what they do

 

[Ske]

Higher rates means stiffer

 

[sucahyo]

Height should be low for FF, high for FR, to help the traction of power wheel on straight.
Hard spring or low damper has better straight acceleration.
Weight transfer is mainly influenced by spring, and weight transfer speed by damper.
But we don't tune just for straight .............

 

[Scaff]

Height should be low for FF, high for FR, to help the traction of power wheel on straight.
Hard spring or low damper has better straight acceleration.
Weight transfer is mainly influenced by spring, and weight transfer speed by damper.
But we don't tune just for straight .............

Weight transfer is not effected by spring rates, only the amount the car moves changes when the spring rate changes, te amount of weight being transfered does not change.

The amount of weight actualy transfered does not change with spring rates at all. The only factors (in GT4) that would effect the amount of weight transfered would be weight reduction (less weight to transfer because the car weighs less), ride height (effects COG, ride height up = more transfer, ride height down + less weight transfer) and balast (amount and location will effect weight to be transfered).

Regards

Scaff

 

[sucahyo]

Weight transfer is not effected by spring rates, only the amount the car moves changes when the spring rate changes, te amount of weight being transfered does not change.

The amount of weight actualy transfered does not change with spring rates at all. The only factors (in GT4) that would effect the amount of weight transfered would be weight reduction (less weight to transfer because the car weighs less), ride height (effects COG, ride height up = more transfer, ride height down + less weight transfer) and balast (amount and location will effect weight to be transfered).

Regards

Scaff

My mistakes, I guess I should not generalizing the Gran turismo physics too much.
I say that because in rear bias Mine Skyline R32.5 side by side braking test:
White rims (top) : 2.0/2.0 spring rate
Black rims (bottom) : 10.0/10.0 spring rate
all : 1/1 1/1 damper, 135/135 ride height, and 1/24 BBC to make the rear tire smoking much.


More on Damper vs Spring effect on weight transfer

 

[Scaff]

My mistakes, I guess I should not generalizing the Gran turismo physics too much.
I say that because in rear bias Mine Skyline R32.5 side by side braking test:
White rims (top) : 2.0/2.0 spring rate
Black rims (bottom) : 10.0/10.0 spring rate
all : 1/1 1/1 damper, 135/135 ride height, and 1/24 BBC to make the rear tire smoking much.


More on Damper vs Spring effect on weight transfer

It could be caused by the very soft spring rates causing the car to bottom out, which would have an effect on the brkaing distances.

Just a thought, as its hard to tell from the top-down shots.

Regards

Scaff

 

[sucahyo]

It could be caused by the very soft spring rates causing the car to bottom out, which would have an effect on the brkaing distances.

Just a thought, as its hard to tell from the top-down shots.

Regards

Scaff

the ride height is max, and many people say there are not bottoming out in GT2.

 

[sucahyo]

Maybe there is bottoming out in GT2, because I forget that I use 89/135 ride height and normal tire for that test (my mistakes again ).


What happens when the car's front scratch the ground? more weight transfer?

About spring rate, If we want to mimic formula 1:

The suspension of a modern Formula One car forms the critical interface between the different elements that work together to produce its performance. Suspension is what harnesses the power of the engine, the downforce created by the wings and aerodynamic pack and the grip of the tyres, and allows them all to be combined effectively and translated into a fast on-track package.

Unlike road cars, occupant comfort does not enter the equation – spring and damper rates are very firm to ensure the impact of hitting bumps and kerbs is defused as quickly as possible. The spring absorbs the energy of the impact, the shock absorber releases it on the return stroke, and prevents an oscillating force from building up. Think in terms of catching a ball rather than letting it bounce.
...
Modern Formula One suspension is minutely adjustable. Initial set-up for a track will be made according to weather conditions (wet weather settings are far softer) and experience from previous years, which will determine basic spring and damper settings...