TA22 Spring rates?

[Tonyger]

im using 300 lbs for the front of my ra45 and 230 for the back , weight of my car is 970 kilos before i get in with full on roll cage and gt rear end
shockers and sway bar s have a lot to how the car drives as well as well as coilovers as well
the ta22 is very similar to a ra40 series coupe
weight split on mine is 52 front 48 rear

I feel stupid now haha, i read that backwards. It says rear axle 46 and front 54. My bad I was thinking about the car it was similar to the 240z.

All good.

Thanks for the clarification.

[Duk]

For selecting spring rates, the best thing that you can do is learn about natural frequencies and go from there.

Typically, for a sporty road car, you'd be looking at a natural frequency around the 1.85Hz range, with the rear's NF about 10% HIGHER than the front.
Keep in mind that just quoting spring rates says very little about the story. Natural frequencies take into account the mass supported by the spring (at that corner), the motion ratio of the spring and the spring rate.

A good example is my Alfa 75 V6. A front engine car with a mid-mounted transaxle. Weight distribution isn't any where near 50/50, but they are pretty well balanced, weight wise. The way the spring numbers pan out is very interesting.
The front has a calculated NF of about 1.74Hz and a spring rate of 602lb/in.
The rear has a spring rate of 175lb/in, but it's natural frequency is about 1.9Hz.

I would highly recommend people thoroughly read http://farnorthracing.com/autocross_secrets5.html

[Tonyger]

For selecting spring rates, the best thing that you can do is learn about natural frequencies and go from there.

Typically, for a sporty road car, you'd be looking at a natural frequency around the 1.85Hz range, with the rear's NF about 10% HIGHER than the front.
Keep in mind that just quoting spring rates says very little about the story. Natural frequencies take into account the mass supported by the spring (at that corner), the motion ratio of the spring and the spring rate.

A good example is my Alfa 75 V6. A front engine car with a mid-mounted transaxle. Weight distribution isn't any where near 50/50, but they are pretty well balanced, weight wise. The way the spring numbers pan out is very interesting.
The front has a calculated NF of about 1.74Hz and a spring rate of 602lb/in.
The rear has a spring rate of 175lb/in, but it's natural frequency is about 1.9Hz.

I would highly recommend people thoroughly read http://farnorthracing.com/autocross_secrets5.html

To do the whole natural frequencies you had to corner weight you car too?

That link you provided was surely interesting and a good read.

Thanks

[Duk]

To do the whole natural frequencies you had to corner weight you car too?

That link you provided was surely interesting and a good read.

Thanks

Front and rear weight would be fine, just divide each weight in half. A local sand yard's weigh bridge would be helpful, just park each end on the scales separately, but make sure the car is level when doing so.