Tire pressures for upgraded elise

[FastSpider]

I know the standard pressures and I searched old postings but didn't find any recommendations on pressures for non-standard cars.

My S1 has standard wheels, with 185 at front and 225 at rear (on 7" rims) Pirellis (can't eaily buy Yoko LTS where I live).

I also have Lotus motorsport suspension, which is stiffer and lowered to about 110mm, and over 200 bhp, and weighs 1750 lbs.

I figure that I should run higher pressures than standard and I've been experimenting but have become confused. In some ways it feels better at 30/32 lbs, but the ride is too hard. At stock pressure it seems too soft.

I use the car a lot on the road, twisty ones... I also do autocross and track days.

So what is recommended for road use and track/autocross use?

If I get yoko 038's on 8" rims for track and autocross, what should I run them at?

Thanks for any advice.

[FastSpider]

I also wonder if temperature matters? I'm in a hot dry climate, 70-90F is typical and it doesn't rain at all in the summer, then pours a lot for a few months in the winter. I did an autocross in the rain last March and it was excellent skidpan training

I'll try leaving the pressures at the stock level for a while to see if I get used to it. I have to raise the front suspension a bit, as lower pressures there seems to allow it to bounce down and bottom out more easily.

[fastspider]

The book that came with my Elise S1 (one of the last built - originally a base spec car) says 23 lbs Front and 27.5 lbs rear for 225's. This is the same as 1.6 and 1.9 bar (but my US made pressure gauge doesn't know what a bar is...)

I'm trying 24.5F and 29R for a week or so to see how it feels.


>> Edited by FastSpider on Thursday 12th September 04:40

>> Edited by FastSpider on Thursday 12th September 04:42

[FastSpider]

So after weekend of fun driving, I guess I'm getting used to the softer tires, however some of the bumpier mountain roads (Bear Creek road in Los Gatos is a nice hillclimb plus wineries :-) I was bottoming out much more often than with harder tires. I'll have to raise the suspension a bit more to compensate....