Suspension upgrades for Cayman T

[GregThoma]

Hi All,

Appreciate your advice, can't seem to find the suspension recommendations for 718 Caymans with SPASM.

The car is used for trips and track days. What I am finding is that when I maximised the current geo the car becomes very lose and grip goes. The reason for trying to improve geo set up is that I am destroying the edges of the tyres.

Before Geo the car was solid at

Front Left -1.05 Right -0.92

Back Left -1.85. Right 1-.98

After Geo the car was more pointy but the back became twitchy and felt Like I had lost grip mid corner.

Front Left -1.28 Right -1.30

Back Left -2.03. Right -2.01

Could not believe that a small amount of change made such a difference. The car was all over the place and with the previous set up the car felt nailed to the ground. Maybe I need to change the way I drive but it felt alien and way slower, no confidence.

Back to set up below and chewing up tyre edges.

Front Left -0.95 Right -0.96

Back Left -1.79. Right -1.79

So have read a lot on LCA’s, Ohlins and KW V3 suspension. The brief is, occasional trips and drive to and from track days, it is not a daily, like the idea of keeping SPASM but open to suggestions. Some Porsche tuners are not interested, get a GT4 is the theme.

Hope to hear from people soon.

 

[mr pg]

Have you checked your toe setups? Excessive toe can also eat tyres.

 

[GregThoma]

Thanks for the suggestion these are the current values.

Front Toe Left is 0.05 and Right is 0.03
Total Toe is 0.07

Rear toe left is 0.13 and Right is 0.15
Total Toe is 0.27
Trust Angle is -0.01

 

[Motorhead]

Hi Greg,

I’m no suspension expert but although the front toe probably is about right, that sounds like a lot of rear toe [out?] which could be a cause of your instability together with excessive rear tyre wear on the inner edges if that’s what you’re experiencing.

I don’t have the base geometry set-up for your car but this link could be of interest for reference:

https://www.718forum.com/threads/stock-suspension-geometry.21050/

If you contact your local Porsche dealer they will be able to provide the stock target values for your car.

Jeff

 

[GregThoma]

Thanks Jeff, that has really helped me understand more of the challenge. Appreciate the information.
Cheers Greg