I dropped my tire pressure from the recommended 32psi down to 29psi to get a softer / cushier ride from the rear tires. Still not satisfied, I dropped it further down to 27psi, which in my opinion, lessened the harshness of the rear suspension. My question is, aside from uneven wear, what other potential problems might I encounter? god forbid, tread separation like firestone tires? Less grip at extreme cornering?

Btw, once warmed up, the rear tires goes up by 2 to 3 psi which gives around 29 to 30psi on my tire gauge. Is this fine?

 

I think your gas milage might be differ... by the way, do u have a Lexus IS200?

 

I can live with a decrease in gas mileage.

Yes, I do own a 2.0L 6 cylinder (1G-FE) Lexus IS200. High displacement engines gets slapped a tax that will make you spin. This is also my frame of reference as to consider the S2000 having a harsh ride. Of course, sports cars are supposed to have stiff suspensions for less body roll and etc., I just didn't expect it to be THAT stiff or harsh.

 

You have to really appreciate the hard ride when it comes to cornering though. It is a sacrifice that I am more than willing to make.

 

The S2000 is not a harsh ride. It is road feel and what you get (and paid extra for) with 4 wheel double wishbone suspension.

 

Well, I don't think that the S2000's ride is that harsh. My Lexus with aftermarket shocks and springs rides much stiffer, but the handling still can't compare with the S2K. (too much body roll in the Lex)

 

You will definitely get less grip on hard cornering, but presumably if you want a 'softer' feel then you will not be driving it hard anyway. The main problem (which you can't avoid by how you drive because it is affected by other road users and situations) is braking. With low tyre pressures under heavy braking you get less rubber on the road because the tyres will actually push down on the edges too much which then will cause the centre of the tyre to rise up above the road. You can actually sometimes see this in skid marks on the road (from cars without abs) where there are two thin skid marks a couple of inches apart for each tyre that has skidded. For your own safety, don't decrease tyre pressures - maybe consider buying a more luxury feel sports car if the ride bothers you.

 

it should, the tires are heated up and the pressure increases.

 

And although it's been talked to death here:

Have you checked to make sure all your spring spacers were removed?!!

 

Is it at all possible that all of your spring spacers were not removed at P.D.I? A few guys have recently found some in their cars...even after many miles (and some track events in at least one case)!

If you can, check each corner with the wheel removed. The cars leave the factory with more than one in each spring (14 total - 10 front, 4 rear), so removing the wheels will allow you to check all the way around each spring.

Hope this isn't the case, but it's definitely worth checking anyway.

Good luck.