Spatt Posted March 6, 2014 Share Posted March 6, 2014 Hi guys. Just got some continental sport contact 5s... I have no idea what pressure is in them. (Will check) what should I put in? They seem slick at around 75 - 80 like they on the verge of breaking free.. I have to stay they dont fill me with confidence... they have covered 150miles now and are improving is this normal? I was expecting too much perhaps(thought they would be on rails) Quote Link to comment Share on other sites More sharing options...
Stutopia Posted March 6, 2014 Share Posted March 6, 2014 I think 75-80 psi is too much, surprised they haven't broken free already Quote Link to comment Share on other sites More sharing options...
RickyZ Posted March 6, 2014 Share Posted March 6, 2014 I run 35psi all round on standard tyre sizes Quote Link to comment Share on other sites More sharing options...
brillomaster Posted March 6, 2014 Share Posted March 6, 2014 takes a while for the release agent to wear off new tyres, what style of driving was the first 150 miles? if its cruising along a motorway, thats not going to be working the tyres particularly hard, so would take even longer to wear off the release agent. Quote Link to comment Share on other sites More sharing options...
Spatt Posted March 6, 2014 Author Share Posted March 6, 2014 Mainly wet motorway miles.. I realise this isn't exactly wearing them in... should I.pretty much reset my clock and do another 150? (Manufacturer min break in) They feel really loose at high speed? I have spacers.. check everythinga tight down there first? Quote Link to comment Share on other sites More sharing options...
Ekona Posted March 6, 2014 Share Posted March 6, 2014 Check alignment, and drop a couple of psi all round. Quote Link to comment Share on other sites More sharing options...
GMballistic Posted March 6, 2014 Share Posted March 6, 2014 (edited) After having the wheels removed for tyre fitting it is always advisable to re-check all the wheel nuts after around 100 miles or so to check that they are all tight still. I always run my standard size Zed tyres (front 225/45/18 rear 245/45/18) at 35PSI as RickyZ mentioned. This is the Nissan recommended tyre pressure. Edited March 6, 2014 by GMballistic Quote Link to comment Share on other sites More sharing options...
Briggsybriggs1 Posted March 6, 2014 Share Posted March 6, 2014 34psi to 35psi for most road cars :-) Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
GMballistic Posted March 6, 2014 Share Posted March 6, 2014 34psi to 35psi for most road cars :-) Sent from my iPhone using Tapatalk For Zeds running standard size 18" tyres then Yes. Other cars with different size tyres then no. Quote Link to comment Share on other sites More sharing options...
Ekona Posted March 6, 2014 Share Posted March 6, 2014 Pressures don't change on tyre size, they change on the tyre compound and the handling traits required. Quote Link to comment Share on other sites More sharing options...
GMballistic Posted March 6, 2014 Share Posted March 6, 2014 Pressures don't change on tyre size, they change on the tyre compound and the handling traits required. What do you mean Dan? For example; 18" 225/45 runs at 34-35PSI but 17" 225/45 runs at 32-33PSI = different tyre sizes/different pressures. I totally agree with the second part of your statement but just don't get the first bit as the pressure needed as a rule usually goes up from what I understand by 2PSI per inch. Or have I read what you wrote wrong? It has been a long day. Quote Link to comment Share on other sites More sharing options...
Ekona Posted March 6, 2014 Share Posted March 6, 2014 Broadly I agree with the 2psi rule, however more people change tyre make and model than size, and most don't realise that pressure is governed by sidewall strength along with various other factors, as well as what you want the car to do with regards to handling traits. Were the 17"s 040s as well? I've no idea, never seen the OEM tyres for that size. Quote Link to comment Share on other sites More sharing options...
Spatt Posted March 6, 2014 Author Share Posted March 6, 2014 Ok 35... I suppose I should go out n check what they actually put in at the garage... but im watching attack of the clones so cba at the mo hehe.. cheers for the advice. I guess if the pressure is right I must have to give them some time to wear in.. After checking all the bolts are tight of course I hope it isn't anything more ... sinister. Quote Link to comment Share on other sites More sharing options...
GMballistic Posted March 6, 2014 Share Posted March 6, 2014 Broadly I agree with the 2psi rule, however more people change tyre make and model than size, and most don't realise that pressure is governed by sidewall strength along with various other factors, as well as what you want the car to do with regards to handling traits. Were the 17"s 040s as well? I've no idea, never seen the OEM tyres for that size. That is true.Some of the low profile tyres nowadays are incredibly sturdy in regards to their side walls. Probably the reason a lot of people don't even notice after their tyre has lost half it's pressure & almost gone flat. 1 Quote Link to comment Share on other sites More sharing options...
bronzee Posted March 7, 2014 Share Posted March 7, 2014 Were the 17"s 040s as well? I've no idea, never seen the OEM tyres for that size. Yes they were. RE040, stock horrible tyres. Quote Link to comment Share on other sites More sharing options...
Ekona Posted March 7, 2014 Share Posted March 7, 2014 Trust me, they were better on the Zed than on the MR2! Quote Link to comment Share on other sites More sharing options...
Briggsybriggs1 Posted March 8, 2014 Share Posted March 8, 2014 34psi to 35psi for most road cars :-) Sent from my iPhone using Tapatalk For Zeds running standard size 18" tyres then Yes. Other cars with different size tyres then no. iv always gone with that rule :-/ so in that case iv got 275/30/20s on my zed should that still be the same :-D ? Sent from my iPad using Tapatalk Quote Link to comment Share on other sites More sharing options...
GMballistic Posted March 8, 2014 Share Posted March 8, 2014 34psi to 35psi for most road cars :-) Sent from my iPhone using Tapatalk For Zeds running standard size 18" tyres then Yes. Other cars with different size tyres then no. iv always gone with that rule :-/ so in that case iv got 275/30/20s on my zed should that still be the same :-D ? Sent from my iPad using Tapatalk Just did a quick search on google and from what I can find it seems that most people with 275/30/20's are running around 38-40PSI with that set up. Below are just some of the quotes from various owners clubs with owners running the same tyre set up. those are the tires i got and i run about 38psi, the same number i've seen around here Read more: http://www.clublexus.com/forums/the-tire-racks-tires-wheels-and-brakes-forum/71968-recommended-tire-pressure-for-245-35-20-and-275-30-20-a.html#ixzz2vNVSCA00 I ran my 245/35/20's at 40psi.. 40psi on rear. I have 20" MK Motorsport wheels, 20x9 and 20x10.5 running 235 at the front and 255 tyres at the rear, I was told to put 36psi all round but the rear tyres were loosing air so put them up to 40psi and every thing is now fine..... 38 PSI all around recommended by my rim shop.... Obviously vehicle weights will differ but I'd maybe have a search yourself on google to see if you can find any info from 350Z owners running the same wheel/tyre set up. Personally though I'd imagine 34-35PSI might be a little low for your 20's and going by the +2PSI per inch rule you should be running around 39PSI which would tally with what I'm finding on the net. Hope that helps. Quote Link to comment Share on other sites More sharing options...
Spatt Posted March 8, 2014 Author Share Posted March 8, 2014 Well i just had my rears re balanced and one was out "15" what ever that means... i drove around on them and they still feel the same. the best way i can describe the feeling is if you change lanes on the motorway they seem to grab at the road and literally throw the car around... i know it didn;t feel like this before i changed the tyres, the pressure is correct (35) and they have covered 250+ miles now so im happy they have worn in. Anyone with Continental Sport Contact 5's had a tram tracking effect or think this is what it would be? Im going to be buying Michelin PS3's for the front soon and i'll get a full align done Quote Link to comment Share on other sites More sharing options...
WhackyWill Posted March 8, 2014 Share Posted March 8, 2014 I run mine at 30 psi, just for a bit of comfort bouncing from pot hole to pot hole and speed bump to speed bump in Town. Quote Link to comment Share on other sites More sharing options...
Briggsybriggs1 Posted March 8, 2014 Share Posted March 8, 2014 34psi to 35psi for most road cars :-) Sent from my iPhone using Tapatalk For Zeds running standard size 18" tyres then Yes. Other cars with different size tyres then no. iv always gone with that rule :-/ so in that case iv got 275/30/20s on my zed should that still be the same :-D ? Sent from my iPad using Tapatalk Just did a quick search on google and from what I can find it seems that most people with 275/30/20's are running around 38-40PSI with that set up. Below are just some of the quotes from various owners clubs with owners running the same tyre set up. those are the tires i got and i run about 38psi, the same number i've seen around here Read more: http://www.clublexus.com/forums/the-tire-racks-tires-wheels-and-brakes-forum/71968-recommended-tire-pressure-for-245-35-20-and-275-30-20-a.html#ixzz2vNVSCA00 I ran my 245/35/20's at 40psi.. 40psi on rear. I have 20" MK Motorsport wheels, 20x9 and 20x10.5 running 235 at the front and 255 tyres at the rear, I was told to put 36psi all round but the rear tyres were loosing air so put them up to 40psi and every thing is now fine..... 38 PSI all around recommended by my rim shop.... Obviously vehicle weights will differ but I'd maybe have a search yourself on google to see if you can find any info from 350Z owners running the same wheel/tyre set up. Personally though I'd imagine 34-35PSI might be a little low for your 20's and going by the +2PSI per inch rule you should be running around 39PSI which would tally with what I'm finding on the net. Hope that helps. thanks for that will have a look around and check the web sits I got them from :-) Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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