Tyre inflation.

arleitiss

Hey, how do I inflate tyres? I mean not how but to what mark? It's Corsa C 5 door hatchback, I just inflated them all to mark 3 and well it feels much better than it was at mark 2. How do I find it out? I mean what mark fits what car?

mark = bar or whatever that pressure measurement is.

Try using this site:http://tyres.theaa.com/aa/search/MakeModelSearch.aspx?searchMake=OPEL&searchModel=CORSA

Toyotafanboi

roughly roughly speaking i'd say your car requires around 30p.s.i. in old money in each tyre, which is around 2 bar.

i'd say 3 bar might be a bit much. google "corsa c tyre pressure" and you'l find out pretty quickly, it'l also be in your owners manual and written on a sticker on the drivers door sill.

arleitiss

Toyotafanboi wrote: »

roughly roughly speaking i'd say your car requires around 30p.s.i. in old money in each tyre, which is around 2 bar.

i'd say 3 bar might be a bit much. google "corsa c tyre pressure" and you'l find out pretty quickly, it'l also be in your owners manual and written on a sticker on the drivers door sill.

Feels kind of **** on 2 bars :pac:
I mean on 3 bars it accelerates smoothly, stops fine, turns are perfect and clean, only thing I noticed speed bumps are bit more "bumpy". While on 2 bars speed bumps I felt like kind of smooth and easy, but turning felt like slipping of water or something a bit, acceleration was slow and felt like engine puts lots of force to accelerate.

Tyres seem to be good I mean grip, not worn out as well.

TJJP

Utterly random - but supposing it's a 1.2 Corsa 2006 ish then the expected PSI for a possible 195/45/16 would be 32 ish... but I could be mad wrong. You need to provide the car date and the tyre sidewall reading e.g. 175/65/14.

Toyotafanboi

Over inflation is every bit as risky, if not moreso than under inflation, stick to what opel intended.

i dont doubt it feels lighter, from my very basic knowledge over inflated tyres have less of the threaded surface in contact with the road. that in itself provides a problem, before you take into account how over pressureised it is.

id be letting some out.

rather heavy steering than some sort of tyre related accident.

arleitiss

oh well guess I will put some air out tomorrow.
It's:
Opel Corsa.
Class/Model: C
Year: 2001.
5 Door hatchback.
1.2L

kirving

Well 1 Bar = 14.7 PSI.

Even though Bar is in the decimal system, and makes everything far easier to work out, I think that using PSI is a better when it comes to tyres because people remember a solid number like 32 PSI far better than 1.8 Bar.

In general, most tyres should be filled to about 30-33 PSI (2-2.3 Bar), but that will change depending on the load you have in the car, and what type of tyres you have fitted. 3 Bar is almost certainly too high which will lead to increased stopping distances and heavier tyre wear towards the centre of the contact patch.

There is often a table of tyre pressues at the garage, and it's definatley in the manual if you're on standard tyres.

FISMA

arleitiss,

You don't go by what the tires say, but what the car says.

Usually, on the sill of the door, there is a manufacturer's plate that gives the recommended PSI.

I would use that. Those automotive engineers are a clever bunch...

arleitiss

FISMA wrote: »

arleitiss,

You don't go by what the tires say, but what the car says.

Usually, on the sill of the door, there is a manufacturer's plate that gives the recommended PSI.

I would use that. Those automotive engineers are a clever bunch...

I tried searching for that tag, couldn't find it

shedweller

Kevin Irving wrote: »

3 Bar is almost certainly too high which will lead to increased stopping distances and heavier tyre wear towards the centre of the contact patch.

Links?:)

Toyotafanboi

shedweller wrote: »

Links?:)

you see the third image is an over inflated tyre, which gets distorted so less of it is in contact with the road.

so the part that is in contact with the road is doing more work so it wears faster, and less of the gripping surface is in contact with the road so it wears faster under braking too and increases stopping distances.

http://www.allcorsa.co.uk/forums/showthread.php/tyre-pressure-cosra-32326.html?amp;

it appears the correct pressures are 32 in the front and 26 in the rear or 2.2 and 1.8 bar.

shedweller

Ah yes but actual data from braking tests etc.
Re: tyre wear. I had a set of tyres at 40 psi for their entire life. I put 100,000km on them and retired the car with 4mm tread left. And it was even wear!

But thats just my anecdotal evidence. This subject has been argued to death for years without any real definitives. All i can say is that i can brake as hard as i like without skidding more than at 32psi.

The nhtsa did some testing in the states and their methodology was fairly good, as you would expect from such an organisation. They found no real increase in braking distance as pressure increased. There was quite an increase as pressure dropped though. Im on the phone now but i'll look for those results later.