SeraTaru Posted May 17, 2019 Share Posted May 17, 2019 Since I got my 370z it's been pulling to left under braking, especially in the wet. Taken it to 3 garages for wheel alignment and balance - all perfect. Last sunday decided to check the tyre pressure. The low profile run flats I have are rated 50 psi. Front left was 27 (!), rest were under 40. After getting them all to 50, it was like driving a new car. *Slaps head* - been an iRacing member for years, yet this never dawned on me in a real situation. Quote Link to comment Share on other sites More sharing options...
Redsky Posted May 17, 2019 Share Posted May 17, 2019 I could be wrong but wouldnt 50PSI be the limit of pressure? I think those wheels are supposed to be 40-45PSI. But if anyone knows any better please feel free to correct me. Quote Link to comment Share on other sites More sharing options...
Ekona Posted May 17, 2019 Share Posted May 17, 2019 Jesus christ please reduce them from 50psi, you'll wear them out in weeks! And then take the run flats off and throw them in the bin, I don't know what 370Z pressures should be off hand, but around 35psi would be MUCH better. 1 Quote Link to comment Share on other sites More sharing options...
SeraTaru Posted May 17, 2019 Author Share Posted May 17, 2019 These tyres came with the car - nowt I can do about it but they are 50 psi believe me : Quote Link to comment Share on other sites More sharing options...
OnlyAfro Posted May 17, 2019 Share Posted May 17, 2019 50psi is the maximum safe rating for the tyre, not what is recommended for the vehicle. Drop em back down. Quote Link to comment Share on other sites More sharing options...
SeraTaru Posted May 17, 2019 Author Share Posted May 17, 2019 (edited) What would you recommend? Was my issue that they were unbalanced, not the overall PSI? I do know at 50 psi I have to take corners gently...no sense of grip. Edited May 17, 2019 by SeraTaru Quote Link to comment Share on other sites More sharing options...
OnlyAfro Posted May 17, 2019 Share Posted May 17, 2019 Maybe 35-40? You're best off doing a chalk test to find out. Quote Link to comment Share on other sites More sharing options...
Ekona Posted May 17, 2019 Share Posted May 17, 2019 11 minutes ago, SeraTaru said: What would you recommend? Was my issue that they were unbalanced, not the overall PSI? I do know at 50 psi I have to take corners gently...no sense of grip. Exactly. The tyres have a tiny contact patch with the ground atm, it's bloody dangerous. Get them dropped asap. Quote Link to comment Share on other sites More sharing options...
Ekona Posted May 17, 2019 Share Posted May 17, 2019 What does it say in the handbook? 35psi isn't going to be far off. Quote Link to comment Share on other sites More sharing options...
SeraTaru Posted May 17, 2019 Author Share Posted May 17, 2019 A what? I've been doing "those look really cool" tests...but chalk? Explain m'friend Yes...I AM mechanically challenged Quote Link to comment Share on other sites More sharing options...
SeraTaru Posted May 17, 2019 Author Share Posted May 17, 2019 I didn't think the handbook had a bearing - the tyres themselves say 50 psi. I am so confused and useless - the 900 CC Getz didn't have these complications! Quote Link to comment Share on other sites More sharing options...
Ekona Posted May 17, 2019 Share Posted May 17, 2019 2 minutes ago, SeraTaru said: I didn't think the handbook had a bearing - the tyres themselves say 50 psi. I am so confused and useless - the 900 CC Getz didn't have these complications! I promise you it did. Tyres are tyres, they still need to be set at the correct pressure for the application Quote Link to comment Share on other sites More sharing options...
SeraTaru Posted May 17, 2019 Author Share Posted May 17, 2019 Ok thanks! I thought it was just about the tyres without reference to the car. I'll check the handbook and see what it says. Quote Link to comment Share on other sites More sharing options...
SeraTaru Posted May 17, 2019 Author Share Posted May 17, 2019 Seems to be 35 psi is a good all round pressure? From googling? Quote Link to comment Share on other sites More sharing options...
Ekona Posted May 17, 2019 Share Posted May 17, 2019 Just go with what the handbook says, as a start. Quote Link to comment Share on other sites More sharing options...
SBSS8) Posted May 18, 2019 Share Posted May 18, 2019 Does it not give you the recommended tyre pressure on the sticker when you have the drivers door open? Quote Link to comment Share on other sites More sharing options...
Ekona Posted May 18, 2019 Share Posted May 18, 2019 Yup. Quote Link to comment Share on other sites More sharing options...
Wayne370Z Posted May 18, 2019 Share Posted May 18, 2019 (edited) On mine it`s 35psi front and back but they aren`t run flats, don`t know if they`re any different. Edited May 18, 2019 by Wayne370Z Quote Link to comment Share on other sites More sharing options...
Jack94 Posted May 18, 2019 Share Posted May 18, 2019 Jheez this thread is worrying if it's for real In the future if anyone tells you to copperslip your discs to stop brake squeal please DON'T DO IT Quote Link to comment Share on other sites More sharing options...
Ekona Posted May 18, 2019 Share Posted May 18, 2019 Guys, back it off a bit, there's no need to be quite so rude. We all had to start from somewhere remember? OP, let me give you a few pointers: - As a basic starting point, the pressure you read on the side of a tyre will always be the maximum it's designed for, not what it should be run at. Running at a very high pressure means that only the very middle of the tyre will be touching the road, which leads to a big loss of grip as you've found out. - As a rule, you'll never go far wrong if you set the tyres to the pressure as stated in the handbook or on the little sticker on the driver's door jam. This goes for regular tyres or runflats. You may find you want to adjust them to personal preference or if you are running a specific tyre (semi slicks in particular need to be run at a MUCH lower pressure), but really the OEM pressure is the one to go by. - Runflats by their nature have a very very stiff sidewall, and looking at yours I'm guessing they're 20"? This is going to lead to an even stiffer ride than if you were running regular tyres, so it could be worthwhile considering getting them changed for regular tyres. There's plenty more to tyres, but really that should get you right for now. 3 Quote Link to comment Share on other sites More sharing options...
Jack94 Posted May 18, 2019 Share Posted May 18, 2019 I agree everyone's gotta start somewhere, but you shouldn't be adjusting things on the car if you have no idea what you're doing, that could end badly. You should either research beforehand (pretty sure you can find anything worth knowing about Z's on here) or ask/take it to someone who knows what they're doing Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted May 18, 2019 Share Posted May 18, 2019 This guy is either winding us all up or he is genuinely clueless and wanting to learn. He has only been on the forum for 3 months and most the posts that he has started are in a similar vein. Check out @SeraTaru However, I do agree that if you can not get a handle on the simple things like tyre pressures then you should leave maintenance stuff to someone who does. Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted May 18, 2019 Share Posted May 18, 2019 49 minutes ago, Ekona said: Guys, back it off a bit, there's no need to be quite so rude. We all had to start from somewhere remember? That is somewhat rather rich coming from you: 2 6 Quote Link to comment Share on other sites More sharing options...
Ekona Posted May 18, 2019 Share Posted May 18, 2019 I know, I'm mellowing in my old age! Quote Link to comment Share on other sites More sharing options...
ilogikal1 Posted May 18, 2019 Share Posted May 18, 2019 22 minutes ago, Ekona said: I know, I'm boring in my old age! FTFY. 1 Quote Link to comment Share on other sites More sharing options...
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