What Tyre Pressure do you run ?

[Rodge]

Bit of background. FPV used to recommend 36 p.s.i. when I first got hooked on the brand in 2007.

Now looking at their recommendation its 38 p.s.i., same Dunlop Sport Maxx 245/35/R19 tyres as in 2007 but recently I've been playing around a bit with tyre pressure to see if I can improve my cars handling and it seems to handle quite a bit better @ 40 p.s.i. than either of the above settings.

Just curious what other people are running in their cars ?, either vote in the poll with the pressure closest to what you're running or any comments you'd like to make are much appreciated.

[In Focus]

Curious that they use Sport Maxx on FPV's, as I have the exact same tyre on the Skoda (although 205/40/R17), and find even 132kw overwhelms then when turning. I can't imagine what 335kw would do for maintaining grip.

Anyway, on topic, though it's probably irrelevant to everyone else's big Ford sedan settings: I run them at 36psi front and 35psi rear, as per manufacturer's recommendation.

[FPV+fteT3]

I run 42 for the last couple of years (fpv 19" rims 245 tyres), had new tyres fitted last week the tyre shop said 40 so I will try that. 42psi made even wear accross the tread face and handled really well dropping 2psi shouldn't make too much difference. If I do a track day drop the pressures to @35psi cold when you pull back into the garage their at 42psi its amazing how much pressure increases when you ask the tyres to really work.

[XR6T0Y]

45 or thereabouts for me with 20's

[FPV+fteT3]

Deleted

[Express]

38psi no matter what size.

[Franco Cozzo]

40 psi across all my cars, except for my Sierra, 44 front and 60 rear.

[d410xlt]

Originally Posted by In Focus

Curious that they use Sport Maxx on FPV's, as I have the exact same tyre on the Skoda (although 205/40/R17), and find even 132kw overwhelms then when turning. I can't imagine what 335kw would do for maintaining grip.

Same sort of situation. 335 turns them very very easily no matter what the situation is.

[T4ME]

50psi that quickly raise to 70psi+ then end up at zero psi.

Keeping in fashion with forum and being serious 38psi cold for me all round has served me well with Invo's and KU31's.

[FNQracing]

Not sure what the purpose of this thread is, as there are so many variables - wheel size, profile, suspension setup, sidewall strength, comfort, handling, fuel economy, high speed, driving around town, carrying a load? Hot, cold?

And then there is the car itself, its weight etc etc..... There will be a thousand different answers depending on what it is you're chasing.

The "right" answer is going to be somewhere on a sliding scale with low pressures giving you comfort, but a trade off in fuel economy, wear and handling - all in the context of what you're trying to achieve. Going way outside "normal" pressures will result in premature tyre death either way.

A real tyre geek aint going to run the same pressures year round, and will adjust pressures depending on the the task at hand - ie towing and extended highway runs.

[XW-BAXR6T]

Always been at 40 psi no matter what size, found 40 psi to be better in all conditions for normal driving "not dragging or racing" and my tyres last an average 7 years with normal driving!

[OffRoadFalcon]

I tend to run 38 in mine, seems like a good number to me!

Generally use the same for my parents vehicles too.

[pottery beige]

45psi.. i care not for soggy lettuce comforts..

[Struggo]

38-40psi on 18's

[DJR-351]

38psi, and about 16 on the beach............

[FPV GTHO]

Usually between 36-38psi for my 18's. Haven't ever found them to grip better with higher psi, just make more noise as they lose grip and lighter on the steering.

[sneaky]

i was told on a driver training course to run about the middle of the car manufacturer recommendation (which is for comfort) and the max for the tyre. usually ends up around 40psi

[castellan]

It depends on the car and what tyre, i find out what it likes best as all are different.
48 psi in the front and 40 rear in the ute with what i have now is best with the cheap rubbish i have now.
It was 42 front 36 rear with good Michelin's. 235/45/17

[MR REKLAW]

38 psi,but i have nitrogen(inert gas) not air in my tyres,so dont suffer from inflation changes due to heat generation.And before any one says nitrogen isnt any better! tell that to all the aircraft pilots around the world who have been landing on nitrogen inflated tyres for years!IE no sudden expansion of tyre when coming from near dead stop to over 150 to 300 kph on landing.Also nitrogen has larger molecules and doesn't migrate out of the tyre as quick as air,therefor do not need inflating as often.Cheers Geoff.

[Addz08]

44psi on my 20's..

[irish2]

Originally Posted by Reklaw's XR8Ute

38 psi,but i have nitrogen(inert gas) not air in my tyres,so dont suffer from inflation changes due to heat generation.And before any one says nitrogen isnt any better! tell that to all the aircraft pilots around the world who have been landing on nitrogen inflated tyres for years!IE no sudden expansion of tyre when coming from near dead stop to over 150 to 300 kph on landing.Also nitrogen has larger molecules and doesn't migrate out of the tyre as quick as air,therefor do not need inflating as often.Cheers Geoff.

Robert Boyle would disagree with this statement.

The reason nitrogen is used in aircraft is to prevent water vapor from freezing in the tyres at high altitude. Altitude is generally not a problem in motor vehicles.

Other than that pure nitrogen will expand at the same rate as any oxygen/nitrogen mix (read normal air) with the same temperature change.

[mik]

34/35 psi on 245/ 255 40 18s, probably a tad low, but I would rather pay for tyres than suspension components, also the area around home has lots of crappy road , not forgetting lots of speed humps, rock hard tyres not for me unless towing or having a spirited day of driving planned, then the pressure goes up to 38 ish.

[M4CO]

Interesting thread, I've never really looked into tyre pressures...I've always just presumed 32psi was the way to go (usually what all the petrol station pumps are set at)

[pottery beige]

50psi makes the steering lightish on XE Falcons.. they is notorious for being heavy...

http://en.wikipedia.org/wiki/Ford_Falcon_(Australia)

[OLD BALDY]

Voted 36 for both G6E turbo 19" and AWD territory 17" That's around town up to about 40 highway and towing van

[STINKY NINJA]

36 psi in my 18s,seems to be ok.

[rancidpunx]

38 fronts and 42 rears as recommended by the rspec owners manual. The drive day we were told to run 45psi all round.

[pottery beige]

Originally Posted by rancidpunx

38 fronts and 42 rears as recommended by the rspec owners manual. The drive day we were told to run 45psi all round.

bingo..

as per FPV drive day..

[MrXR8]

hi I have 245/40 r18 Dunlop sport max. what psi should I be running?

[MR REKLAW]

Originally Posted by irish2

Robert Boyle would disagree with this statement.

The reason nitrogen is used in aircraft is to prevent water vapor from freezing in the tyres at high altitude. Altitude is generally not a problem in motor vehicles.

Other than that pure nitrogen will expand at the same rate as any oxygen/nitrogen mix (read normal air) with the same temperature change.

I STAND CORRECTED,THANKS Geoff.