Soya Supersonic January 29, 2004 Share January 29, 2004 if 32 is correct then looks like my butt dyno is spot on all along. ↡ Advertisement Link to post Share on other sites More sharing options...
Arkaneslayer Neutral Newbie January 29, 2004 Author Share January 29, 2004 i have tweaked your example a bit. see my edited reply. Link to post Share on other sites More sharing options...
Arkaneslayer Neutral Newbie January 29, 2004 Author Share January 29, 2004 "No offense but jap car can use 17"s also right ? To me there should be a minimum psi for tyres especially when their shape is 'fixed', can u imagine if its a balloon? Just my view " of cos jap cars can use 17" but there will be recommendations for different load ratings of the 17" tyres. re your minimum psi - how do you determine that? Link to post Share on other sites More sharing options...
Soya Supersonic January 29, 2004 Share January 29, 2004 dun think it's got anything to do wif jap or conti. the debate here shld be abt the formula, i reckon. Link to post Share on other sites More sharing options...
Arkaneslayer Neutral Newbie January 29, 2004 Author Share January 29, 2004 u reckon rite ... Link to post Share on other sites More sharing options...
E36UDM Neutral Newbie January 29, 2004 Share January 29, 2004 It should go by volume, bigger tyres need higher volume to fill up. psi = pounds per sq metres Link to post Share on other sites More sharing options...
E36UDM Neutral Newbie January 29, 2004 Share January 29, 2004 Yup im aware its the formula but with everything being constant how can a 17" be 22 psi on a jap car ? Link to post Share on other sites More sharing options...
Arkaneslayer Neutral Newbie January 29, 2004 Author Share January 29, 2004 "It should go by volume, bigger tyres need higher volume to fill up. " not true. chk this site : http://classic2.alfisti.net/english/service/reifendaten.htm 205/50-16 = 10.69 litres of air 205/45-17 = 9.91 litres of air the logical thing to do would be to increase air pressure to maintain volume of air isn't? Link to post Share on other sites More sharing options...
Soya Supersonic January 29, 2004 Share January 29, 2004 the formula assumes an even load distribution but in reality, braking or cornering will naturally exert more force on the respective tyres. but heck the formula, i reckon my butt dyno more accurate as each of us hv individual preferences for that 'perfect' ride/handling balance. Link to post Share on other sites More sharing options...
E36UDM Neutral Newbie January 29, 2004 Share January 29, 2004 Ur rite pressure to maintain the volume Link to post Share on other sites More sharing options...
GDIzen Neutral Newbie January 29, 2004 Share January 29, 2004 (edited) Hmmm, that merits careful consideration...maybe we have to simulate the actual conditions with a volunteer couple from MCF!!! Edited January 29, 2004 by GDIzen Link to post Share on other sites More sharing options...
Pauly75ts Neutral Newbie January 29, 2004 Share January 29, 2004 "how do you determine the exact psi" Hi! there, ArkaneSlayer, I don't use butt-dyno, because there's a good chance for "Oh! sheeit!!" I started by asking around for the pressure use on the particular tyre, 1st from the tyre shop where I mount the tyre & from friends & relations. Correct pressure is determined by the timing of a run at the end of which, analysis of tyre performance & handling problems is reviewed. Car makers won't review tyres from different manufacturers, only their tyre supplier. They'd only do it for the super car class, when a set of parameter as determined by the design of the car & suspension system is given, the tyre manufacturers are given the specs and are invited to send it for testing. As mentioned by my previous post, the Enzo Ferrari is shod with Bridgestones, that's because they're partners in the F1 team. Similarly, if an oil change on the Enzo that cost US$732 is not observed, will cost an engine replacement of US$200,000 because warranty is void for not using the specified Shell engine oil. On my car, there's no factory recommendations on brands of tyres so any tyres will do, as long as the specified parameters are followed, as I've gone to +1, it's over-exceeded already. But the current set of tyres don't have a settled tyre pressure yet, as I haven't done a test run. But it should be able to keep an old Alfa 155 2.5L V6 from leeching at my butt. Rgds Paul Yong Link to post Share on other sites More sharing options...
Arkaneslayer Neutral Newbie January 29, 2004 Author Share January 29, 2004 "Correct pressure is determined by the timing of a run at the end of which, analysis of tyre performance & handling problems is reviewed." yes ... we seem to be getting somewhere but still, your regular folk would not have the luxury, interest or equipment to do as you do .... what kinds of analysis of tyre performance? what kinds of handling problems? i'm sure normal city driving dun require such indepth analyses rite? and your regular folk ain't gonna be literate in this area anywayz ... moreover we not are deciding optimum tyre pressures for tracking purposes... still having read all that you wrote, i am unable to determine what is the optimal tyre pressure as a regular city driver base on your methods. Link to post Share on other sites More sharing options...
Saaber Neutral Newbie January 29, 2004 Share January 29, 2004 hmmmm...... just sidetrack abit:- for a parked car which is subjected to vibrations in the dark corner of a isolated carpark, which tyre pressure is good?? and I wondered???... whose car might that be... Link to post Share on other sites More sharing options...
Arkaneslayer Neutral Newbie January 29, 2004 Author Share January 29, 2004 another check - the all popular toyota corolla G9. Kerb weight for auto car - 2590 lbs add passengers & stuff - 310 lbs total = 2900lbs tyre size - 185/65-15 tyre pressure based on weight to be carried : (2900/4408)*44 = 28.95 psi recommended tyre pressure in the toyota corolla manual = 30 psi. Link to post Share on other sites More sharing options...
Kardachia Neutral Newbie January 29, 2004 Share January 29, 2004 In my altis manual, the figure for tyre stated 210. What value is that? is it a different measuring system? Sorry, me un-informed in this aspect. Link to post Share on other sites More sharing options...
Pauly75ts Neutral Newbie January 29, 2004 Share January 29, 2004 "optimal tyre pressure as a regular city driver" Hi! there, ArkaneSlayer, If it's only for city driving, just follow what's printed on the sticker by the side of your car door. Rgds Paul Yong Link to post Share on other sites More sharing options...
Genie47 1st Gear January 29, 2004 Share January 29, 2004 If I'm not wrong. It is kPa. KiloPascals. ↡ Advertisement Link to post Share on other sites More sharing options...
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