Tyre Pressures - Page 3

Kai Herb · 20th June 2011, 13:09

I always go by Engine / Variant rather than a "catch all"

As others have said there is no way a 1.8 Zt saloon will put the same load onto the tyres as a V6 Zt Tourer

rovexCDTi · 20th June 2011, 13:16

To be honest put in what you feel is best for you, the 'recommended' is just a guide, although i wouldn't go to far from it.

On my 420 turbo I tended to put 2 PSI more than was recommended, on my ZT I put 2 PSI less. Its more compliant like that and handling is no worse, in fact its better in the wet.

navrac · 20th June 2011, 13:28

The local garage had a faulty gauge and it ended up putting 36 in the front and 38 in the rear.

Missus nearly didn't make the 5 mile journey home - the back swung out on every corner and it almost hopped along the road.

rovexCDTi · 20th June 2011, 13:37

Remember that the suspension is set up to work with the tyres fitted in the factory. Some brands have stiffer sidewalls than others.

As the suspension wears the tyres should be slightly softer, otherwise the wheel might hop around because the damper isnt able to dampen the whole suspension (yes the damper does dampen the tire as well). This is why i reduced the pressure in my ZT tyres. My 420 turbo had new adjustable Koni units that were very hard, soft tyres would have been an unpleasant experience. Better ride, but the handling would have become unpredictable.

Trophy Blue Tourer · 20th June 2011, 15:58

Quote:

Originally Posted by chrissyboy

the charts are the right pressures ,if your loading the car well up then add a couple of extra pounds .i wouldnt take much notice of the book ,im not telling you this is my opinion ,alot in books is wrong . if in doubt look on the tyre for the manufacturers recommend tyre pressure

Right Mate !!

I HAVE to say this!!

You need to wind your neck in on this one!!!

You are SO SO WRONG !! I just can't belive it!!

1 - You should stick to the hand book preasures!!

2 For Gods sake !! the preasures on the side wall of the tyre are the MAXIMUM that tyre is rated for!! by its makers !! at the maximum load stated !! also stated on the sidewall!!

NOT!! I REPEAT NOT!! to be used if you dont know what the correct preasure for your particular car is!!!!!!!!!!!!!!!!!!!

I just went outside and read mine!! do you really think that I should just pump them up to 50psi??

Oh and guess what else it has moulded on the sidewall ???

It says PLEASE FOLLOW THE RECOMENDATIONS IN YOUR OWNERS HAND BOOK OR THE TYRE PREASURE PLACARD ON YOUR CAR!!!

It dont come any clearer that THAT!!!!!

I have to say Chrissy I often get a bit of a chuckle at some of your posts!!

But that one is just plain dangerous!!!! - there ARE people on this forum who have no car know how at all and might take your (sorry - well ment probably - but often dubious statements) as gospel!! especialy as you crack on about " being on a training course" or whatever quite often - I can only assume you havent done the tyre one yet??

I will say again!! this ISNT a personal thing here - I dont know you!! but you really shouldnt make statements like that !!

As it often says missuse of this item can cause personal injury or death!! - and not just to/of the person that might follow your post!!

I am saying to anyone reading the above post!!

PLEASE DONT FOLLOW THE ADVISE IN IT!!

USE YOUR HAND BOOK!!!!!

ANDY

chrissyboy · 20th June 2011, 17:06

Quote:

Originally Posted by trophy blue tourer

right mate !!

i have to say this!!

you need to wind your neck in on this one!!!

you are so so wrong !! I just can't belive it!!

1 - you should stick to the hand book preasures!!

2 for gods sake !! The preasures on the side wall of the tyre are the maximum that tyre is rated for!! By its makers !! At the maximum load stated !! Also stated on the sidewall!!

not!! I repeat not!! To be used if you dont know what the correct preasure for your particular car is!!!!!!!!!!!!!!!!!!!

i just went outside and read mine!! Do you really think that i should just pump them up to 50psi??

oh and guess what else it has moulded on the sidewall ???

it says please follow the recomendations in your owners hand book or the tyre preasure placard on your car!!!

it dont come any clearer that that!!!!!

i have to say chrissy i often get a bit of a chuckle at some of your posts!!

but that one is just plain dangerous!!!! - there are people on this forum who have no car know how at all and might take your (sorry - well ment probably - but often dubious statements) as gospel!! Especialy as you crack on about " being on a training course" or whatever quite often - i can only assume you havent done the tyre one yet??

i will say again!! This isnt a personal thing here - i dont know you!! But you really shouldnt make statements like that !!

as it often says missuse of this item can cause personal injury or death!! - and not just to/of the person that might follow your post!!

i am saying to anyone reading the above post!!

please dont follow the advise in it!!

use your hand book!!!!!

andy

i repeat the pressures in the charts are the right pressures....... before you make incorrect statements like this have the evidence to hand .... whatever your wheel size is put the CHARTS RECOMMENDED pressure in the tyres ,then drive the car . i know you will be posting that the car handles much better with the new pressures .....

raykay · 20th June 2011, 17:45

The manufacturers spend all that time and money working out what tyre pressures are best for the different versions of the car.........................and it's all wasted because someone thinks that all you need is the size of the wheel.

rovexCDTi · 20th June 2011, 17:52

Exactly. Its more to do with the suspensions spring rates and damper strength than tyre size. Most cars seem to be around the 30PSI mark, tyre size not withstanding. There are exceptions, some nearer 40, some nearer 20, but 30 is average.

When i bought my car the dealer replaced the rear tyres and put 40PSI in them, it was undrivable. I stopped at the first garage to check, saw the pressure and put 30 in all round.

Kai Herb · 20th June 2011, 17:54

How does that old adage go......

"A little knowledge is a dangerous thing"

HarryM1BYT · 20th June 2011, 17:59

Quote:

Originally Posted by Trophy Blue Tourer

2 For Gods sake !! the preasures on the side wall of the tyre are the MAXIMUM that tyre is rated for!! by its makers !! at the maximum load stated !! also stated on the sidewall!!

NOT!! I REPEAT NOT!! to be used if you dont know what the correct preasure for your particular car is!!!!!!!!!!!!!!!!!!!

I agree. That figure on the tyre is an ABSOLUTE MAXIMUM pressure for the tyre - the pressure beyond which you must not go. It is NOT a recommended pressure for that tyre on your car. Use the handbook recommended pressure for the car, the engine, the wheel size and load it is carrying, perhaps with a couple of pounds adjustment up or down to suite you and the handling.

Less pressure means less efficiency, more contact with the road and tyres generating more heat. More means less contact with the road, less heat generated, a bouncier ride and better mpg.

I set mine up only at home, using a known accurate gauge and check them regularly.

20th June 2011, 13:16	#22
rovexCDTi This is my second home MG ZT+ 135 Join Date: Jan 2011 Location: Exeter Posts: 3,626 Thanks: 9 Thanked 42 Times in 26 Posts	To be honest put in what you feel is best for you, the 'recommended' is just a guide, although i wouldn't go to far from it. On my 420 turbo I tended to put 2 PSI more than was recommended, on my ZT I put 2 PSI less. Its more compliant like that and handling is no worse, in fact its better in the wet. __________________ [SIGPIC][/SIGPIC]

20th June 2011, 13:37	#24
rovexCDTi This is my second home MG ZT+ 135 Join Date: Jan 2011 Location: Exeter Posts: 3,626 Thanks: 9 Thanked 42 Times in 26 Posts	Remember that the suspension is set up to work with the tyres fitted in the factory. Some brands have stiffer sidewalls than others. As the suspension wears the tyres should be slightly softer, otherwise the wheel might hop around because the damper isnt able to dampen the whole suspension (yes the damper does dampen the tire as well). This is why i reduced the pressure in my ZT tyres. My 420 turbo had new adjustable Koni units that were very hard, soft tyres would have been an unpleasant experience. Better ride, but the handling would have become unpredictable. __________________ [SIGPIC][/SIGPIC]

20th June 2011, 17:52	#28
rovexCDTi This is my second home MG ZT+ 135 Join Date: Jan 2011 Location: Exeter Posts: 3,626 Thanks: 9 Thanked 42 Times in 26 Posts	Exactly. Its more to do with the suspensions spring rates and damper strength than tyre size. Most cars seem to be around the 30PSI mark, tyre size not withstanding. There are exceptions, some nearer 40, some nearer 20, but 30 is average. When i bought my car the dealer replaced the rear tyres and put 40PSI in them, it was undrivable. I stopped at the first garage to check, saw the pressure and put 30 in all round. __________________ [SIGPIC][/SIGPIC]

20th June 2011, 13:09	#21
Kai Herb Gets stuck in MG ZTT+ 2.5 160 Join Date: Sep 2009 Location: North Devon ish Posts: 743 Thanks: 0 Thanked 1 Time in 1 Post	I always go by Engine / Variant rather than a "catch all" As others have said there is no way a 1.8 Zt saloon will put the same load onto the tyres as a V6 Zt Tourer

20th June 2011, 13:28	#23
navrac Loves to post Rover 75 Tourer Conn SE CDTI facelift Join Date: Dec 2008 Location: Suffolk Posts: 387 Thanks: 0 Thanked 0 Times in 0 Posts	The local garage had a faulty gauge and it ended up putting 36 in the front and 38 in the rear. Missus nearly didn't make the 5 mile journey home - the back swung out on every corner and it almost hopped along the road.

20th June 2011, 17:45	#27
raykay I really should get out more....... Now Other Manufacturer Join Date: Nov 2006 Location: Co. Kerry Posts: 2,786 Thanks: 16 Thanked 310 Times in 283 Posts	The manufacturers spend all that time and money working out what tyre pressures are best for the different versions of the car.........................and it's all wasted because someone thinks that all you need is the size of the wheel.

20th June 2011, 17:54	#29
Kai Herb Gets stuck in MG ZTT+ 2.5 160 Join Date: Sep 2009 Location: North Devon ish Posts: 743 Thanks: 0 Thanked 1 Time in 1 Post	How does that old adage go...... "A little knowledge is a dangerous thing"