just wondering how much everyone pumps their tyres at? in psi?
i got 205/40/17s at the front and 225/50/17 at the rear and i pumped them the other day at 33psi and my car seems to hop everywhere over bumps and likes to follow the road all of a sudden...
is 33 psi 2 much for those kinda tyres? i wouldn't know
or could my erratic handling situation b caused by something else?
the handling problem your talking about is called "tramlining" and is caused by the tread pattern on your tyres. Not much you can do about it except replace the rubber.
The sticker added when my car was made imported says 32 psi on stock 16's. I haven't checked them yet, but 40 sounds huge. But whatever you guys reackon!
my god, i've never taken my tyres more than 35psi!
isn't it really really bumpy? especially when u got stiff springs as well?
i just deflated my tyres 2 30psi this arvo and my handlig is so much better, it actually stays on the road instead of hopping about... is that bad at such low pressure?
does it matter what kind of tyre u have? i got Dunlop Le Mans at the front and Nankang at the rear... wondering if i should jack it up 2 38psi like u guys said...
just like playing with your suspension, its just a matter of fine-tuning to suit your own needs - dont be afraid to fiddle with it, coz who knows.. maybe you are not using your car to it's full potentials! just make gradual changes ie. dont go from 32psi to 42psi!
*nodS* most of the tyres I use are Z rated so they should thorectically be able to take 45psi under max load . . . =)
Which basically means around 40 psi including the usuall punishment of bumps and other knocks =)
Lower psi will give you a bigger patch area and is generally better for dragging in straight lines as you'll get more girip.
However tyres will flex more which will absorb more shocks but predicable handling will suffer as the tyre moves across the face of the rim, you could also damage the side walls with low psi.
Generally anything below 30 is bad =) but I keep a minimum of 35 =)
Most family sedans will have their pressure around 32 psi.
Having low psi acts as additional shock absorber and comfort is more important to some people compared to handling performance but as G1 said, it's a matter of what you like, you have to play around but check the max pressure under max load for your tyres =)
Just as a side, I was told all tyres can hold 40 psi in them but I haven't done any research myself, they might of been generalising to a specific class and above =)
every different brand of tyre has a different max pressure stamped on the side wall. You should inflate your tyre to a couple of psi below the recommended maximum for your particular brand. If the wheels are sliding or spinning then deflate a bit, if it is sluggish out of corners etc then pump em up.
Tyre wear is also a good indicator of bad inflation. Wear down the centre of the tyre - too high, wear on both edges - too low. You have to expect wear on the outside of the front though, no matter what.
MADFTO wrote:You must remember that the tyre pressure increases as the tyre warms up.
=)
I dont think tyre temp changes the pressure by very much though. I dont think it would be more that 1 psi???
By the time you drive to the servo your tyres will be at operating temp anyway.
That's right the recommended tyre pressure is for when the tyres are cold. so normally by the time you drive to a servo it will be definitely hotter, so depending on how hot the day is and how much you've heated up the tyres, i would say to be safe at least 2-3psi higher than the recommended.
on a hot summers day i would go at least 5-6psi above.
i think tyre pressure goes up something like 1psi for every 5-10 degrees, but i would have to look that up to be sure..
