CrustyCrab Posted August 21, 2013 Share Posted August 21, 2013 Hi people, It's a bit of a weird one... Had a full geo set up done at Abbey Motorsport (awesome as usual) and needed new tyres so i have just bought 4 Michelin Pilot Super Sports to finish it off. I have GT Rays and got correct size tyres. Now the problem - it just doesn't feel quit right! After the alignment was done it felt like a new car but now with new tyres it feels like it is veering or perhaps a bit tram liney. Now I have noticed it its really sticking in my mind and bugging me. Tyre pressures are 30 psi all round and I'm pretty sure the right wheels are on the right axels but will check tomorrow. Spoke with Mark and he is giving me advice but I just wanted to see if anyone had any other ideas? Thanks, Crab Quote Link to comment Share on other sites More sharing options...
ioneabee Posted August 21, 2013 Share Posted August 21, 2013 shouldn't it be 35psi I could be completely wrong of course - I'm told I usually am 2 Quote Link to comment Share on other sites More sharing options...
CrustyCrab Posted August 21, 2013 Author Share Posted August 21, 2013 I think so but could it make all that much difference? Quote Link to comment Share on other sites More sharing options...
theheff Posted August 21, 2013 Share Posted August 21, 2013 Wheels on right place are easy to check so get that done. Even the best mechanics will make mistakes sometimes. If not take it back to abbey, I'm sure they will have no issue getting it on a ramp and checking it all out Quote Link to comment Share on other sites More sharing options...
KyleR Posted August 21, 2013 Share Posted August 21, 2013 Maybe tyres on back to front? Shoot the pressure up to 35 just to see though. Quote Link to comment Share on other sites More sharing options...
ioneabee Posted August 21, 2013 Share Posted August 21, 2013 (if I am correct about 35) the difference between 30 and 35 will be noticeable Quote Link to comment Share on other sites More sharing options...
Sam Mcgoo Posted August 21, 2013 Share Posted August 21, 2013 5 psi in a tyre makes a massive difference to the feel and handling of the car! Pump your tyres up, most people have them a little higher than the recommended pressure on the zed. Stick 36 in them and adjust up and down accordingly to how it feels. You may need to have different pressures front and back, so bare that in mind. Quote Link to comment Share on other sites More sharing options...
coldel Posted August 21, 2013 Share Posted August 21, 2013 Step forward Ekona? Quote Link to comment Share on other sites More sharing options...
CrustyCrab Posted August 21, 2013 Author Share Posted August 21, 2013 Wheels on right place are easy to check so get that done. Even the best mechanics will make mistakes sometimes. If not take it back to abbey, I'm sure they will have no issue getting it on a ramp and checking it all out Yeah, already spoke to Mark and he's been going through the options so no worries there. 5 psi in a tyre makes a massive difference to the feel and handling of the car! Pump your tyres up, most people have them a little higher than the recommended pressure on the zed. Stick 36 in them and adjust up and down accordingly to how it feels. You may need to have different pressures front and back, so bare that in mind. Ok I'll make sure they are all properly adjusted and see what it feels like then. Maybe tyres on back to front? Shoot the pressure up to 35 just to see though. THe tyres are on the right way round, already checked that one Quote Link to comment Share on other sites More sharing options...
HaydnH Posted August 21, 2013 Share Posted August 21, 2013 I reckon fixing the PSI will sort it, I found the Z seemed to tram line loads on the RE050As even at 33 psi! I don't notice it so much with the AD08s though. Quote Link to comment Share on other sites More sharing options...
Stutopia Posted August 21, 2013 Share Posted August 21, 2013 I find that if mine drop off from 35 (to say 31) the car feels quite different. For whatever reason mine don't seem to hold 35 for very long (any ideas anyone?). I've recently gone up to 36 (assuming I can trust the digital readout on the machine) and it feels good. Sometimes when I accelerate on say a roundabout when they're low, my ass feels the car just shift a little over - not slide, just shift a bit. I put it down to pressures and maybe the Michelin's have softer tyre walls than the Bridgestones I had before. Happy to be corrected though. Quote Link to comment Share on other sites More sharing options...
Will370z Posted August 21, 2013 Share Posted August 21, 2013 I find a big difference in both the zeds if the pressure varies even a small amount. Try 35 and see how it feels Quote Link to comment Share on other sites More sharing options...
CrustyCrab Posted August 22, 2013 Author Share Posted August 22, 2013 Cheers for the advice, as long as I get away from work at a reasonable time that will be tonight's mission Quote Link to comment Share on other sites More sharing options...
ChrisB Posted August 22, 2013 Share Posted August 22, 2013 I agree with this. I was recently convinced I had somewhere along the line knocked tracking out as the car was fidgity and drifting left - until I checked pressures and found one rear tyre (a Michelin MPS2) 7psi softer than the other 3. Pumped all tyres back up to 35psi and everything was fine again. Of course the MPS2 was a recently new tyre, so it remains to be seen if I have a slow puncture Quote Link to comment Share on other sites More sharing options...
maddog1982 Posted September 3, 2013 Share Posted September 3, 2013 Should the tyres be inflated to 35 when warm or cold? Quote Link to comment Share on other sites More sharing options...
CrustyCrab Posted September 3, 2013 Author Share Posted September 3, 2013 Not sure, I followed the advice to 36psi and it seems to have solved the issue. That was when cold. Thanks for all the help folks Quote Link to comment Share on other sites More sharing options...
Ekona Posted September 3, 2013 Share Posted September 3, 2013 How the buggery I missed this thread, I have no idea. Glad you got it sorted dude. Oddly though I would actually recommend dropping a couple of PSI with the MPSS due to the stiffer sidewalls, but that's personal preference. I used to run my Zed on the MPS2 with 33F/34R, I just found it gave a better balance but then that was in combination with an aggressive geo so it wouldn't work for everyone. If 35/35 works for you, then definitely stick with it Quote Link to comment Share on other sites More sharing options...
HaydnH Posted September 3, 2013 Share Posted September 3, 2013 Should the tyres be inflated to 35 when warm or cold? Cold. Quote Link to comment Share on other sites More sharing options...
NeilMH Posted September 3, 2013 Share Posted September 3, 2013 I think you may find 36 cold a fraction too much but everyone to their own taste (or maybe it was a typo and you meant 35?) Quote Link to comment Share on other sites More sharing options...
maddog1982 Posted September 3, 2013 Share Posted September 3, 2013 So what should you put in them when there warm? As by the time I ge tto the garage the tyres will be hot. I have been trying different settings, popped 37 in when hot other day but feels very light so going drop them down a touch Quote Link to comment Share on other sites More sharing options...
Ekona Posted September 3, 2013 Share Posted September 3, 2013 Go and buy an electric pump and do it at home. The Michelin one that Halfrauds sell is pretty good, costs £40 and now comes with a removable pressure gauge too. Quote Link to comment Share on other sites More sharing options...
HaydnH Posted September 3, 2013 Share Posted September 3, 2013 So what should you put in them when there warm? As by the time I ge tto the garage the tyres will be hot. I have been trying different settings, popped 37 in when hot other day but feels very light so going drop them down a touch The required air pressure when "warm" will vary depending on what the temperature of the air in the tyres is. I'm sure you could take a temperature reading and figure it out with some basic maths but it's much easier to drive slowly straight to the garage in the morning and if it's really that far to the garage then add a few PSI to compensate, then measure with a handheld gauge the next morning to see if it's fallen to 35 or not. 1 Quote Link to comment Share on other sites More sharing options...
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