Pauly75ts Neutral Newbie February 2, 2004 Share February 2, 2004 "normal city driving dun require such indepth analyses rite?" Hi! there, ArkaneSlayer, You've seem to miss the point, and unsure of which point. No car factory or tyre factory determine the optimum tyre pressure, only the current driver of the car. When you started the thread, I'd thought you might be interested in getting to know your car better, but since you didn't mention what car you're driving, I gave a general view of what I'd do for my car up to use on a racetrack. I also include the stories I've heard through the years. You'll have to understand the car makers don't make tyres, so won't know what tyres to put on their cars. Regular folks whether literate or not is not the concern, they need to know how to drive the vehicle well in all road & weather conditions. I've a friend who kept bugging me to go on the racetrack, which I don't, and to shut him up, I told him that we'd do it when it rains. There you have the optimum tyre pressure thrown out of the window, as it require other factors in driving to come into the picture. A car enthusiast will ultimately be able to drive their car well, and improve it as the years go by, and not to make it worst. I'm also a regular city driver, but I don't follow the increase in tyre pressure as stated in the manual, when I drive to KL, Ipoh, Kuantan or Penang. Rgds Paul Yong ↡ Advertisement Link to post Share on other sites More sharing options...
Madarmour Neutral Newbie February 2, 2004 Share February 2, 2004 Kerb weight's 1250kg according to my manual. Mine's a 2000 model. States that normal load 32psi and full load + 3psi. Link to post Share on other sites More sharing options...
Madarmour Neutral Newbie February 2, 2004 Share February 2, 2004 He drives a T4. Link to post Share on other sites More sharing options...
Pauly75ts Neutral Newbie February 2, 2004 Share February 2, 2004 "drives a T4" Hi! there, Doc, What's that?? Twin 4s How's about a run up North? Rgds Paul Yong Link to post Share on other sites More sharing options...
Madarmour Neutral Newbie February 2, 2004 Share February 2, 2004 I think Arkaneslayer's point is whether we have a way to determine what is the optimum pressure other than just relying on the figures given by the manual. Without this 'optimum' pressure to work from, it's difficult to know what's overinflating and what's underinflating. And how to manage the tyre pressure to suit our driving characteristics/car setup etc..... Link to post Share on other sites More sharing options...
Madarmour Neutral Newbie February 2, 2004 Share February 2, 2004 Sorry a Volvo T4. Link to post Share on other sites More sharing options...
Pauly75ts Neutral Newbie February 2, 2004 Share February 2, 2004 "a Volvo T4." A BLOODY VOLVO DRIVER!!!!! Rgds Paul Yong Link to post Share on other sites More sharing options...
Madarmour Neutral Newbie February 2, 2004 Share February 2, 2004 That series of ads was pretty interesting. Link to post Share on other sites More sharing options...
Pauly75ts Neutral Newbie February 2, 2004 Share February 2, 2004 "ads was pretty interesting." Hi! there, Doc, The last one with the cute little girl is best. Rgds Paul Yong Link to post Share on other sites More sharing options...
Arkaneslayer Neutral Newbie February 2, 2004 Author Share February 2, 2004 "I think Arkaneslayer's point is whether we have a way to determine what is the optimum pressure other than just relying on the figures given by the manual. Without this 'optimum' pressure to work from, it's difficult to know what's overinflating and what's underinflating. And how to manage the tyre pressure to suit our driving characteristics/car setup etc..... " i couldn't put it any better ... Link to post Share on other sites More sharing options...
E36UDM Neutral Newbie February 2, 2004 Share February 2, 2004 I think Arkaneslayer's point is whether we have a way to determine what is the optimum pressure other than just relying on the figures given by the manual. Without this 'optimum' pressure to work from, it's difficult to know what's overinflating and what's underinflating. And how to manage the tyre pressure to suit our driving characteristics/car setup etc..... Guess the only way is to let it run over a big piece of paper and determine whether its over or under. As for driving characteristics and setup it should be by trial and error or by feel/butt..... different people have different threshold for roll. Different tyres also react differently with same psi eg Kumho with soft side wall is better off with 1-2 psi higher than hard side wall tyres. Even F1 have to go thru so many test-drives and different setups for different tracks to find the ultimate winning setup. Link to post Share on other sites More sharing options...
Madarmour Neutral Newbie February 2, 2004 Share February 2, 2004 Guess the only way is to let it run over a big piece of paper and determine whether its over or under. As for driving characteristics and setup it should be by trial and error or by feel/butt..... different people have different threshold for roll. Different tyres also react differently with same psi eg Kumho with soft side wall is better off with 1-2 psi higher than hard side wall tyres. Even F1 have to go thru so many test-drives and different setups for different tracks to find the ultimate winning setup. I agree with your statement totally but there must be a starting point, don't you agree? If you don't even know where to start, then how to experiment? He is trying to find a formulae on the 'optimum' pressure. Right or wrong, I don't know. It seems pretty close for a few cars he went through but it doesn't seem to work for my car. For myself, I'll just stick with the manufacturer's recommendation, use it as my starting pressure, and work it out from there to fine tune to my requirements. Throughout the discussion, while many gave good advise to about tyre pressure, no one yet can come out with another way to calculate the starting point. Your point: Different tyres also react differently with same psi eg Kumho with soft side wall is better off with 1-2 psi higher than hard side wall tyres. His point: 1-2 psi higher than what pressure. Link to post Share on other sites More sharing options...
Madarmour Neutral Newbie February 2, 2004 Share February 2, 2004 Just trying to bring things to perspective....... Link to post Share on other sites More sharing options...
Saaber Neutral Newbie February 2, 2004 Share February 2, 2004 Well, we can use the manufacturer recommended tire pressure as a base setting and then we adjust from there thru trial and error lah, but then again, different terrains and style of driving call for different pressure again and so there is not really 1 setting for all lah if you want to pursue the best possible handling for different occasions.......... Link to post Share on other sites More sharing options...
E36UDM Neutral Newbie February 2, 2004 Share February 2, 2004 Yup i understand but think only the tyre manufacturer can shed more light on this or some research. Remembered read somewhere that they calculate from bar and convert to psi..... will try to find out more. Link to post Share on other sites More sharing options...
Madarmour Neutral Newbie February 3, 2004 Share February 3, 2004 Well, we can use the manufacturer recommended tire pressure as a base setting and then we adjust from there thru trial and error lah, but then again, different terrains and style of driving call for different pressure again and so there is not really 1 setting for all lah if you want to pursue the best possible handling for different occasions.......... Correct! The base setting here is important. How to determine the base setting is what Arkaneslayer trying to say, unless I read wrong all the while. Well, maybe the 'optimum' pressure should have been renamed as 'base' pressure and the debate would not be too hot! Link to post Share on other sites More sharing options...
Madarmour Neutral Newbie February 3, 2004 Share February 3, 2004 think only the tyre manufacturer can shed more light on this or some research. I think so too and I'm not too sure that calculating the base pressure would be that simple. Therefore, I rely on the magic number given to me by Alfa as my base pressure. Link to post Share on other sites More sharing options...
Arkaneslayer Neutral Newbie February 3, 2004 Author Share February 3, 2004 "Correct! The base setting here is important. How to determine the base setting is what Arkaneslayer trying to say, unless I read wrong all the while. " you're correct - i'm trying to understand the manufacturer's base setting.... ↡ Advertisement Link to post Share on other sites More sharing options...
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