View Full Version : tyre pressure??
what pressure do u recommend i should put in my tyres..
profile is 205/45/r17 or 205/40/r17 cant remember if its 40 or 45..too cold to go and check :p :D
whats the recommended prssure??
on a cold tyre u should run about 38-40 tahtl go to 42-44 with heat from driving :)
03-06-02, 10:29 PM
when i did my advanced driving class we were told no less than 40 psi ...
03-06-02, 11:02 PM
so u reckon 40 psi in
would be ok? I run 34 at the moment, and it seems ok... On my advanced driving course, they made us all have 32 psi (hot) in our tyres and said thats where they should be at
torana fan tht 32 psi hot sounds a bit odd, see i dont know if pressure increases or decreases when the tyre is hot? but you would think the pressure would go up because the expansion of the air when it gets hot, but then the tyre could expenad and stretch a little when hot.
BAHHHHHh anyone a tyre scientist and can explain this?
i run 36 psi on my car and it is running 195x65x14's and it seems to work for me
best thing to do wouldgo out and experiment with various pressures.
04-06-02, 11:29 PM
Novel idea....consult you tyre placard. Its in either the Glove box or drivers door jam or some times under the bonnet..
I run 50psi in my tyres. You'd be amazed at how many people assure me a tyre will explode with that much pressure. My extensive analysis proves otherwise! :)
Seriously though, 50psi is a bit much for most people (I like it because it helps the drift factor), but 40psi is pretty good if you're interested in going around corners. Anything less is only good if you want a nice cushy ride.
05-06-02, 08:44 AM
Wow norbie... 50 psi!.. FWIW I run 38 cold in the front and 36 cold in the front of my pulsar with 185/65//13s'
On my KE30 I used to run 37 psi all round cold
RA40--- pressure rises when temperature increases. :D
05-06-02, 10:42 AM
it is recommended to have 40psi when tyres are cold, but when u look into the specs for the tyre it will tell u no more than 50 :D
anyhow i am running on 40 and it is just fine ...
05-06-02, 12:17 PM
On the side of my tyre, it has written "Max 44 PSI"
so i put 39psi in when it was coldish (drove like 500 metres to the petrol station) and i have noticed a little difference over 32 psi, but not much...
Differences i have noticed...
* More Traction
* Better Ride & Smoothness
* Less Tram-Lining
05-06-02, 12:35 PM
i run 35psi front and 32psi rear
I need all the grip i can get(still not enough, stoopid tyre prices)
like someone said, experementation is a good way to decide.
in general use higher pressures if you do a lot of cornering to reduce shoulder wear, lower pressures for straight line driving. don't run insanely high pressures or the contact patch will be distorted and the shock absorbing abilities of the tyre may be compromised. the car manufacturers placard is a good guide but sometimes they put comfort over performance so their recommendation is conservative. lower pressures in the back will increase oversteer and vice versa, use this to tune your handling a little bit.
my tyre placard recommends 26psi for stock tyres (which are probably something skinny like 155's). With 185/60/R14 FM901's I find 30-32psi to be a good compromise. 35psi is too harsh for daily driving, so unless I'm thrashing it around corners I'll leave them a bit lower. I think at the moment I'm using 32 in the front and 30 in the back.
I use 38 psi hot, I find it works pretty good have experimented with any more than that.
06-06-02, 10:42 PM
well, i've been running 39psi in all 4 tyres now for about a week, and have noticed one major thing...
MASSIVE understeer..... however, not much oversteer compared to what it used to get... can anyone tell me how to stop this? would lowering the front pressures down to say 36 or so help? or will it make it worse?
try raising the front tyre pressures a bit
Try lowering front tyre pressures as well ;)
I would have thought that reducing the pressure a bit would make the tyre more compliant so it would ride over bumps better, plus it would lengthen the contact patch slightly. At least, the back end of my car feels more skatey when I run 36psi compared to 30psi.
I run 36/36 as recommended on my tyre placard...
I've tried running 40 at the front with no noticable difference asides from harshness.
I'll try going a little higher and see what happens.
07-06-02, 05:03 PM
ok... i'm now running 40psi on the front, and 38 on the rear... i'll let yas know how it goes.....
*looks @ the sky..... mmmmmmm...... looks like rain :D*
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