tyre Pressures - conflicting Info

[john87]

I run 36 PSI in my R all round, this is as per the fuel flap reccomendations for 18" wheels. However, the R is over 100kgs heavier than the mk5 GTI, and the 60/40 weight distribution obviously means more pressure in the rears than in an equivalent car with FWD.

I ran 33 front, 31 rear in my GTI 

[Scottymon]

Perhaps I'm running them a bit too high... but I get wicked fuel consumption on a run... I thought 31/33 PSI was for 17's...

[Panthera]

I follow what is on the indside of the fuel flap - Normal load -  35psi. I have tried 36psi and it felt a bit skitish, but that was with Dunlop Sport Max tyres.   Then I had Goodyear Eagle F1 Asymmetric 2 and I tried them with 35psi then 36psi and 37psi and no difference. I think they needed at least  40+ psi in them. This was probably due to how they are made - all floppy and ballooney.  I now have Pirelli PZero Rosso Asymetrico and run 35psi and I am as happy as larry with them. They feel spot on. 

It all depends on the tyre and how it is constructed, the wheel (alloy/steel), the car it is going on and the type of driving the owner of the car is going to be doing can all factor into when pressures will suit and feel correct.  Or words to that effect.

[Andy]

When i fit tyres to the gti i put 34psi in them--some of the ones quoted are :stupid:are to high

[Scottymon]

I put 70 PSI in my Semi-Slick MTB Tyres - and the Road Bike boys put in over 100.

[Frodo-anni]

38psi, as per fuel cap, but on occasion it does seem very hard. Almost floaty on the winters ive just fitted. Hankook icebears.

Will try abit lower next week.

The g/f Leon is 32psi front, 29 rear.

[Top Cat]

It should really be inflated to the tyre makers recommendations the strength and structure of the sidewall  dictates how much air is required. This being said you are not going to be far out with VW recommendations.
I used to use A048's for my Exige and they recommend 25psi ish, my new tyres are Avon ZZR and they insist on 31psi. Quite a big jump on a light car.

[ROH ECHT]

Morning guys,

Before someone flames me, ive done a search and im still confused!

Looking to take delivery of a pair of Michelin PS3's (225/40/18 XL 92Y) to go on the fronts of the ED30. The rears will have Vredestein Ultrac Sessanta's.

Now, when it comes to tyre pressures, I used to fill to 30 PSI all round. After having 4 wheel alignment carried out, the technician advised that I should always fill to whatever the manufactures recommends. In my case, its 36PSI front and rear (IIRC).
However, just been looking at a couple of online tyre pressure guides such as:

http://www.hiqonline.co.uk/Expert-Advice/Tools-and-Reminders/Pressure-Guide/
http://www.tyresafe.org/tyre-safety/tyre-pressure-check
http://www.national.co.uk/information/tyre-pressure.aspx#tyrecheck

They all indicate that I should be running (for normal loads):

Front: 44 PSI
Rear: 29 PSI

You can clearly see a difference in what is advised compared to what VW recommend, hence my new found confusion  

Im going to give the Michelin helpline a ring to see what they recommend.

What pressures do you guys recommend as "optimal" pressure for a regular driver after maximum fuel economy, max grip and minimal wear?

Thanks in advance

Rich  

I always go with the car manufacturer's recommendation first. So 35psi in my case...then I adjust from there depending on wear...center wear=need for lower pressure...outer wear=need for higher pressure. I do not rotate them so it is easy to detect the wear. Mine ended up being best at 37psi when cold...and this is important in regards to when you check the pressure.

I find it best to do a few hours after it has been parked at night or very early in the morning before sunrise...or in my case, in the garage. Never check it with one side exposed to direct sunlight.

So...check it when cold, adjust if too high, note the pressure if too low, head to the source of air and add to it for what you noted it to be when too low. You may have checked it cold and it read 30 psi...when you arrive at the air station it may read 33psi. If shooting for 36psi, you were at 30 psi when cold, now it is at 33 psi, so you add until it reads 39 psi. When cold again you just check it once more. Did that make any sense?

[JigBake]

Im running Michelin PS3's all round. 38psi in every corner for me.

Just got off the phone from VW customer services. The agent handling my call put a query to their technical department and they came back with 38 PSI front and rear.
I guess the data has been updated since the 2007.

Jake - where did you get the figure 0f 38 PSI from out of interest?

Thanks

Rich

Sorry for late reply. That figure is what it says in my petrol flap, but in bar.......whatever that equates to. I dont have any problems with it at that pressure.

[timwills17]

For a smoother ride you would go with your oem recommended pressures. I deffo wouldn't have same pressures front and rear though.


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