what tire or tyre pressure ?

[leasaunce]

You are probably better off running between 32 to 38PSI in your tyres COLD. Don't run around on your tyres then check the pressure. the heat that has built up in your tyres through running on them will give you a false reading, and you can tend to over inflate your tyres causing too much wear in the center of the tread.

true that. but if you do have driven the car, the thumb rule is, to pump it 4psi over the pressure you want (eg; 38psi --- 42psi). ALSO NEVER DEFLATE HOT TYRES! not that you'll do it.

[Flaps]

why not?

[leasaunce]

why not?

LOL! i don't know exactly (doesn't say why on the net) but I think it has something to do with the sidewall of the tire, putting too much stress I've never done it before...so any volunteer??

[Blitzen]

why not?

Because the heat build up from tyre wall flex/road contact friction causes the air inside the tyre to expand, giving false readings if you over inflate/deflate the tyre. Thats why when you are running on the road, you are best off inflating/deflating when the tyre is cold.

[noone]

Now I'm using after-market springs (H&R), the ride can be a bit rough at low speeds over rough ground.

If my tyres are a little under inflated, will this be a more or less comfortable ride?

If mid 30s is pretty average, will pumping the pressure up to 40+ make muck of a difference at low speeds?

Using the Stock Conti's BTW

[Blitzen]

Now I'm using after-market springs (H&R), the ride can be a bit rough at low speeds over rough ground.

If my tyres are a little under inflated, will this be a more or less comfortable ride?

If mid 30s is pretty average, will pumping the pressure up to 40+ make muck of a difference at low speeds?

Using the Stock Conti's BTW

Pumping up to 40+ PSI increases the risk of over inflation once the tyres heat up. This will cause a harsher ride, and will cause a smaller contact patch on the road, therefore causing uneven wear in the center of the tyre. You are running a risk of harsher ride, less grip, and decreased tyre life.

[noone]

well... After a quality and accurate inflation to 36psi (or whatever the BP's version of 36 is) from 32, some good results...

The cornering and I think even straight line traction kicked a@#!

I think even with the normal springs, the extra PSI makes the car hold much better traction around the corners. Don't know why I didn't try this earlier...

I didn't notice a harsher ride, but this is pretty subjective and I didn't have a good variety of roads to test this out... Nothing like a pothole or sudden ride in the road to break all sentiment about what felt better.

Have to try 40psi next time, but for anyone who hasn't played with the pressure, definitely worth a tweak and test

[Gti Dave]

I recently run my stock tyres on 40psi and definately feel a lot better performance wise.

[SidGTi]

What about those that run 17's? Should the tyre pressure be similar to those that run the stock 16 inch rims too? Or obviously because it's a lower profile tyre should be pressure be different?

[seangti]

Pumping up to 40+ PSI increases the risk of over inflation once the tyres heat up. This will cause a harsher ride, and will cause a smaller contact patch on the road, therefore causing uneven wear in the center of the tyre. You are running a risk of harsher ride, less grip, and decreased tyre life.

All the side effects here are true, though if you ever track it or regularly drive hard in the dry, stick closer to 40psi (or a few more), than mid 30's. Marginally less ultimately traction, but when the car moves/slides, it's more gradual. Also means less wear to the side walls as the continentals have soft walls on em. On any other low profile tyre, i'd be atleast 2psi less all round.

I run 40/38 (f/r) in mine and find that best for me. can be slightly harsh at low speeds with H&R's on rough ground.