Over inflated tyres

[hks_kansei]

i'm the same as beavis, mid 30s normally.



Tyre shops generally put pressures at the higher end of what's normal since they know most customers won't check them.

More air at the start means in 6 months the tyre wont have dropped below normal pressure yet.
That and the whole quieter, feels better, less fuel use, etc etc.

[rascal]

or the really lazy tyre shops, who for anything that requires the tyre to be refitted just blow it up with enough pressure to seat the bead then put it on the car without letting the pressure back down to normal levels.

I had a puncture repair done the other week, and after having the tyre refitted I checked the pressure on the way home and it was at 47psi!

[ManiacLachy]

I got new tyres the other day ... gonna check pressures this afternoon

[hks_kansei]

or the really lazy tyre shops, who for anything that requires the tyre to be refitted just blow it up with enough pressure to seat the bead then put it on the car without letting the pressure back down to normal levels.

I had a puncture repair done the other week, and after having the tyre refitted I checked the pressure on the way home and it was at 47psi!

Yeah i've had a few of those.

When I used to do a few Motorkhanas in my Mondeo i'd often pump the rear tyres to about 50 or 60psi, generally i'd just look at the max pressure on the sidewall and put them a few psi below.

Felt like sh*t, but at least it helped get it sideways.

[Hot Rodders]

I've always run my tyres at 30-32 psi. I find this gives good grip and the tyers wear longer. My tyre man is always on the ball after any tyre repair. Find some one you can depend on with regard to tyres.
HR

[Rocky]

I have been playing with tyre pressures on the NB8B myself lately.
Pumped them up to 35/36 cold for my drive today which consisted of a lot of curves and twisties.
I felt that it was a little on the high side with a touch more understeer than I am used to and a bit harsher than normal.
I think I'm going to drop them back to 34 psi where I usually have them.
Problem is I have several tyre gauges and none read the same.

[Odd]

After research and consideration.....I'm running my tyres @ 26psi cold(30/31psi Hot)....manufacturer's recommendation
and I check them at each refill....once a month (and I'll definitely check after each service)
No doubt adding an extra couple of psi for Hwy driving wouldn't hurt.....but I prefer to drive winding back roads than boring highways

I can find lots of information about dangers of under-inflation.....but not a lot on overinflation other than potential for uneven tread wear
but....I believe my understeering incident was due to over-inflation

Seems everyone has an opinion.....based on gut feel....all greater pressure than Mazda's recommendation ???
Does anyone know of test results...with various pressures?
data on effects....stopping distances,tyre wear,heat build up

I'd suggest the 26psi nominated by Mazda would be based on what is best from engineering/safety point of view
It gives a more comfortable ride and allows more control on a typical rural road that could have pot-holes and irregular road surfaces
unlike a smooth race track

Seems logical to me that a Light car with 2 passengers would need less pressure in the tyres than a heavy car carrying 4 passengers
NA8 is 980kg ....recommended tyre pressure...26psi
Cx5 is 1627kg.....recommended tyre pressure...34psi
Running a NA8 @ 36psi cold is like running a CX5 @ 47psi cold....which is...in reality....ridiculous

Sure 36psi...might safeguard under inflation....might be valid on a CX5 or Mazda6...but IMO is very dangerous on a light MX5

[NitroDann]

The steering is more precise with more pressure, people enjoy this feeling of precise steering.

[Odd]

Until you hit a pot hole....or greasy patch

Understeering onto wrong side of the road through a corner isn't a fun feeling

http://www.wheels.ca/news/over-inflated ... -bad-idea/

[NitroDann]

Understeer isnt caused by high tyre pressure.

[davekmoore]

NDs are fidgety with the 36 cold that uneducated workshops ( ) like to put in them. They're really nice, balanced, and zoom-zoomy with the 29 cold recommended by Mazda. Despite this, two cars I borrowed from the Mazda press fleet recently had 36 in them. This nearly cost me a sale until the customer told me how much he loved the car except for the fidgeting.

[NitroDann]

Its still taste, regardless of how you look at it.

Lower or higher dont affect balance, but they do affect overall grip and higher pressure will increase the characteristics of the alignment. Not having dríven an ND I suspect that like an 86 it has a lot less toe in than most passenger cars, this -feels- darty to people used to driving a yacht to work, increased pressure will make this even more noticeable, same goes for a car set to over or understeer.

Dann

[Odd]

I'd suggest it's about perception.....

If you believe Mazda have engineered a great car and they recommend 26psi....and you believe information by all major tyre manufacturers who also recommend that information....then that will work for you

but if Ronnyroadracer on a forum says 36psi is faster, better handling...and you believe it....
then I suppose that's taste......It will wear out the middle of the tyre first and it will be rough and skittish....but you will believe it makes you faster

but my bet is that they don't get geniuses to put air in tyres in most workshops....even Mazda dealer workshops
most cars serviced would be passenger/4x4's.....36psi works
They don't read the door label when the odd MX5 is in for service

[NitroDann]

If you believe Mazda have engineered a great car

It is great but it isnt the exact car I'd have built, it doesnt have the same alignment Id want mine to have, and the tyre pressure isnt the same as id prefer either.

Also 200whp short..

The point is that many prefer their cars different and its great that they can be customised to suit tastes.

[Odd]

That's the difference.....

Mazda has ENGINEERED a car

Others chose to add significantly more power, increase wheel sizes and widths...increasing rolling diameter and track, lower the car and change suspension, changing the suspension geometry and You can increase tyre pressure to taste

Lovely.....but....It's no longer Engineered....it's modified and in most cases, more than likely....illegal

I'm more than Happy for others to take their chances and make their changes....just not with my car without my knowledge