What is the optimal tire pressure to reduce understeer?
What tire pressure do you all prefer?
Tire Pressure
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mdrburchette
- Posts: 5754
- Joined: Wed Jan 25, 2006 5:49 am
- Your car is a: 1972 Fiat 124 Sport
- Location: Winston-Salem, NC
Re: Tire Pressure
If you run a little lower pressure in the rear, it seems to help understeer. I run 32 all the way around for normal street driving but lower the rear to around 22-25 when autocrossing with my Kuhmo autocross tires. Play with you air pressure to find the best solution.
I've got different setups on both my 71 and 72 Spiders. The 71 has the stock swaybar, shocks, springs and tire size. The car leans in turns but I didn't notice any extreme understeer:
On my 72 I have a 1" sway bar, Koni yellows, stock springs and wider tires. The tires are pretty hard and even though the car didn't lean at all, it had a bit of understeer. The Kuhmos really tightened it up and by adjusting air pressure, I was able hook it up in the turns. This pic is with my old hard tires:
I've got different setups on both my 71 and 72 Spiders. The 71 has the stock swaybar, shocks, springs and tire size. The car leans in turns but I didn't notice any extreme understeer:
On my 72 I have a 1" sway bar, Koni yellows, stock springs and wider tires. The tires are pretty hard and even though the car didn't lean at all, it had a bit of understeer. The Kuhmos really tightened it up and by adjusting air pressure, I was able hook it up in the turns. This pic is with my old hard tires:
1972 124 Spider (Don)
1971 124 Spider (Juan)
1986 Bertone X19 (Blue)
1978 124 Spider Lemons racer
1974 X19 SCCA racer (Paul)
2012 500 Prima Edizione #19 (Mini Rossa)
Ever changing count of parts cars....It's a disease!
1971 124 Spider (Juan)
1986 Bertone X19 (Blue)
1978 124 Spider Lemons racer
1974 X19 SCCA racer (Paul)
2012 500 Prima Edizione #19 (Mini Rossa)
Ever changing count of parts cars....It's a disease!