Re: tyre pressure
Full load in my handbook for 15" is 2.1 bar (1.9 normal)
Full load in my handbook for 15" is 2.1 bar (1.9 normal)
Technical Tyre Pressures
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Technical Tyre Pressures
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Re: tyre pressure
mine run between 38-40PSI on 205/40/17, someone told me to lower it because it was too much but when i did the car handled like ****.
tyre ware is more on the inner on the front but this is due to the camber being out after lowering, will get this sorted shortly.
rear tyres are wearing normally.
mine run between 38-40PSI on 205/40/17, someone told me to lower it because it was too much but when i did the car handled like ****.
tyre ware is more on the inner on the front but this is due to the camber being out after lowering, will get this sorted shortly.
rear tyres are wearing normally.
nidza
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Re: tyre pressure
I don't beleive that a handbook says for 15" regular tyres to be inflated up to 2.7 bar. I am driving cars half of my life and have never seen such a nonsense. There're probably some special tyres and special dimensions which require different setup.
If Continental says 2.7, then do so. I just find it quite strange for 15" usual tyre.
http://www.etyres.co.uk/vehicle-makes-models/tyres-fiat.htm
27PSI = ~1.8bar (probably petrol)
33PSI = ~2.2bar (probably diesel)
You can find several charts on the web, and Stilo is just any other regular car. The diesel mostly need more pressure to the front tyres, because of the heavier engine, and that's usual practice.
I would've checked with Continental again - unless you know that you have some special type of summer tyre (anyway, this should've been mentioned before).
If you prefer stiff car, then start from suspension, not from tyres - my advice.
17" low profile probably need more pressure.
I don't beleive that a handbook says for 15" regular tyres to be inflated up to 2.7 bar. I am driving cars half of my life and have never seen such a nonsense. There're probably some special tyres and special dimensions which require different setup.
If Continental says 2.7, then do so. I just find it quite strange for 15" usual tyre.
http://www.etyres.co.uk/vehicle-makes-models/tyres-fiat.htm
27PSI = ~1.8bar (probably petrol)
33PSI = ~2.2bar (probably diesel)
You can find several charts on the web, and Stilo is just any other regular car. The diesel mostly need more pressure to the front tyres, because of the heavier engine, and that's usual practice.
I would've checked with Continental again - unless you know that you have some special type of summer tyre (anyway, this should've been mentioned before).
If you prefer stiff car, then start from suspension, not from tyres - my advice.
17" low profile probably need more pressure.
Re: tyre pressure
Your ultimate ability to stay on a road surface should be increased if you use the recommended tyre pressures. Increasing the tyre pressure reduces the tyres footprint so it's very difficult to see how this would IMPROVE road holding.
handling like **** should be an interesting discussion
Your ultimate ability to stay on a road surface should be increased if you use the recommended tyre pressures. Increasing the tyre pressure reduces the tyres footprint so it's very difficult to see how this would IMPROVE road holding.
Re: tyre pressure
Will do. Sorry for not mentioning different tires for different seasons. Suddenly forgot I'm not on a nordic forum. It is obvious to have two sets over here.
Had some Good Year tires for the Uno earlier. These tyres are also on the Ritmo Abarth today. They were filled up with 2.8 bars at the seller.
And that is a great advice.
Morten.
Will do. Sorry for not mentioning different tires for different seasons. Suddenly forgot I'm not on a nordic forum.
It is obvious to have two sets over here.Had some Good Year tires for the Uno earlier. These tyres are also on the Ritmo Abarth today. They were filled up with 2.8 bars at the seller.
And that is a great advice.
Morten.
Re: tyre pressure
Just to ask, on my alloys ( 18s ) it says MAX PRESSURE 44psi so what would be my safe bet on them??? Thanx Marco
Just to ask, on my alloys ( 18s ) it says MAX PRESSURE 44psi so what would be my safe bet on them??? Thanx Marco
Re: tyre pressure
Ok reading this post again I realise morty is on 15" wheels and I quoted for the 17" wheel so for the 1.6 on 15s its 2.3 bar all around fully loaded just thought I would clear that up
Full load in my handbook for 15" is 2.1 bar (1.9 normal)
Ok reading this post again I realise morty is on 15" wheels and I quoted for the 17" wheel so for the 1.6 on 15s its 2.3 bar all around fully loaded just thought I would clear that up
Cris
New member
Re: tyre pressure
There's a difference between handling and road-holding.
If the tyre deforms too much when you corner then it won't be pointing exactly where you want/expect it too. If you then turn the wheel more the differential will change. Generally linear steering response is a good thing.
I had an original Corsa (before the Lotus tweaks) and it had all sorts of rubber rubbish in the front subframes. Made it very unpredictable when "pressing on".
Mine feels horrid with much less than 35PSI. Wether it grip less is up to conjecture - it may well be better, I've not done any back to back testing. However if the car feels wrong I push it less.
A lot of this depends on tyrewall stiffness (fnar fnar). If the sidewalls aren't that stiff you'll need more pressure. I also wonder if that fact that I'm using 16" coupe wheels which are 6.5" rather than 7" has an effect.
handling like **** should be an interesting discussion
Your ultimate ability to stay on a road surface should be increased if you use the recommended tyre pressures. Increasing the tyre pressure reduces the tyres footprint so it's very difficult to see how this would IMPROVE road holding.
There's a difference between handling and road-holding.
If the tyre deforms too much when you corner then it won't be pointing exactly where you want/expect it too. If you then turn the wheel more the differential will change. Generally linear steering response is a good thing.
I had an original Corsa (before the Lotus tweaks) and it had all sorts of rubber rubbish in the front subframes. Made it very unpredictable when "pressing on".
Mine feels horrid with much less than 35PSI. Wether it grip less is up to conjecture - it may well be better, I've not done any back to back testing. However if the car feels wrong I push it less.
A lot of this depends on tyrewall stiffness (fnar fnar). If the sidewalls aren't that stiff you'll need more pressure. I also wonder if that fact that I'm using 16" coupe wheels which are 6.5" rather than 7" has an effect.
Re: tyre pressure
Hiya,
I have a stilo 1.4i, sport active. It come standard with 17'' alloys, I took it to my local tyre garage, and they advised for me to put in 32 psi.
But i think it all depends on the tyre on your car, bearing in mind i have dunlop sport maxx (flat drives) on my stilo.
Hope this helps you!
love h x
Hiya,
I have a stilo 1.4i, sport active. It come standard with 17'' alloys, I took it to my local tyre garage, and they advised for me to put in 32 psi.
But i think it all depends on the tyre on your car, bearing in mind i have dunlop sport maxx (flat drives) on my stilo.
Hope this helps you!
love h x
Re: tyre pressure
You are of course right that an under inflated tyre can give as many problems as an overinflated one but it takes a brave fellow to say the tyre manufacturers don't know their own tyres.
Push to car to the limits of its very ability to grip and you'll learn the difference quick enough.
Many of us who have ridden push bikes quickly learn the affect of high tyre pressures. You can go a lot faster with them high but you don't half come off easier too
You don't have to kill yourself (or anyone else) to prove this. Find a deserted car park or unused road in the wet. Start with high pressures and check how the car breaks away. Now reduce the pressure to what the manufacturer recommends and I predict pretty much any driver should notice the difference.
Take care though
Not a lot in my books but I did say this would get interesting.
You are of course right that an under inflated tyre can give as many problems as an overinflated one but it takes a brave fellow to say the tyre manufacturers don't know their own tyres.
Push to car to the limits of its very ability to grip and you'll learn the difference quick enough.
Many of us who have ridden push bikes quickly learn the affect of high tyre pressures. You can go a lot faster with them high but you don't half come off easier too
You don't have to kill yourself (or anyone else) to prove this. Find a deserted car park or unused road in the wet. Start with high pressures and check how the car breaks away. Now reduce the pressure to what the manufacturer recommends and I predict pretty much any driver should notice the difference.
Take care though
Re: tyre pressure
Unless your manual has been updated then I still get:
Stilo 15" 195/65 R15 = 1.9 bar normal; 2.1 bar loaded (or high speed)
Sorry Phil, but I think you've just quoted figures for 16" wheels.Ok reading this post again I realise morty is on 15" wheels and I quoted for the 17" wheel so for the 1.6 on 15s its 2.3 bar all around fully loaded just thought I would clear that up
Unless your manual has been updated then I still get:
Stilo 15" 195/65 R15 = 1.9 bar normal; 2.1 bar loaded (or high speed)
Re: tyre pressure
This simple question has resulted in a long discussion. That is great, as we all can learn from it.
Phil, I have also seen that 2.5/2.7 bars are for the 17" wheels. Mine are 15", and should have 2.1/2.1 bars according to the "Stilo big book", which I think I've never opened... until now. All figures at full load. Still, my tires say max 51 PSI which equals 3.5 bars (350 KPa). According to my Stilo handbook 0.3 bars should be added when tires are hot, as they always are when driving to a petrol station.
So, the correct value for my 1.6 Stilo on 15" are 2.4 bars when fully loaded. I have never had any problems with grip, and I'm not planning to change to 17" due to the cost of it, and I like the comfort of 15" tires.
The instruction book also says 0.2 bars should be added to winter tires in addition to the 0.3 bars. This results in 2.6 bars on winter tires. This shows I've been driving on too low pressure on my winter tires.
Well, I wasn't far out. 2.1+0.3=2.4 bars according to the manual.
M.
This simple question has resulted in a long discussion. That is great, as we all can learn from it.
Phil, I have also seen that 2.5/2.7 bars are for the 17" wheels. Mine are 15", and should have 2.1/2.1 bars according to the "Stilo big book", which I think I've never opened... until now. All figures at full load. Still, my tires say max 51 PSI which equals 3.5 bars (350 KPa). According to my Stilo handbook 0.3 bars should be added when tires are hot, as they always are when driving to a petrol station.
So, the correct value for my 1.6 Stilo on 15" are 2.4 bars when fully loaded. I have never had any problems with grip, and I'm not planning to change to 17" due to the cost of it, and I like the comfort of 15" tires.
Argonought said:I'm afraid I agree
The instruction book also says 0.2 bars should be added to winter tires in addition to the 0.3 bars. This results in 2.6 bars on winter tires. This shows I've been driving on too low pressure on my winter tires.
nidza said:
Well, I wasn't far out. 2.1+0.3=2.4 bars according to the manual.
M.
Re: tyre pressure
Interesting point about adding 0.2 bars to winter tyres (I hadn't seen that) but even so this really only adds up to (1.9 + 0.2) = 2.1 bars. This is based on normal load but if you really do drive fully loaded then that pushes it to 2.3 bars.
At the end of the day stick with what you're happy with and it's certainly greener to keep them at higher pressure You'll soon know if they're seriously over pressure anyway because as Phil has mentioned they'll start to wear in the middle of the tread.
I purely wanted to point out that at higher pressure you're likely to lose out on the grip the tyre would offer if only inflated to the recommended pressure but then if you don't drive like a :devil: (which I'm bound to say is a good thing) that doesn't hold much relevance does it
Morty, that's a good summary but tyre pressure should be measured when cold and when the manual refers to 'hot' it means really hot i.e. like after a long motorway run and not just driving a few miles down the road.
Interesting point about adding 0.2 bars to winter tyres (I hadn't seen that) but even so this really only adds up to (1.9 + 0.2) = 2.1 bars. This is based on normal load but if you really do drive fully loaded then that pushes it to 2.3 bars.
At the end of the day stick with what you're happy with and it's certainly greener to keep them at higher pressure
You'll soon know if they're seriously over pressure anyway because as Phil has mentioned they'll start to wear in the middle of the tread.I purely wanted to point out that at higher pressure you're likely to lose out on the grip the tyre would offer if only inflated to the recommended pressure but then if you don't drive like a :devil: (which I'm bound to say is a good thing
) that doesn't hold much relevance does it
Cris
New member
Re: tyre pressure
Whilst we on the topic of over/under-inflation:
My fronts at 35psi have worn far more at the edges compared to the centre which are much less worn. Even with 35psi the tyres still have a lot of sidewall bulge an the wear pattern shows all of the available tyre is being used.
Mine certainly understeers sooner with lower tyre pressures. My Falkens work very nicely in the dry and are pretty good at dealing with 250ft/lbs of torque being unleased with lock-on. However wet grip is very poor. Nicely controllable (you'd have to be a plonker to spin in) mind, but no grip.
Under-inflated tyres will also heat-up more than over-inflated ones. Depending on the tyre this can be a good/bad thing.
Whilst we on the topic of over/under-inflation:
My fronts at 35psi have worn far more at the edges compared to the centre which are much less worn. Even with 35psi the tyres still have a lot of sidewall bulge an the wear pattern shows all of the available tyre is being used.
Mine certainly understeers sooner with lower tyre pressures. My Falkens work very nicely in the dry and are pretty good at dealing with 250ft/lbs of torque being unleased with lock-on. However wet grip is very poor. Nicely controllable (you'd have to be a plonker to spin in) mind, but no grip.
Under-inflated tyres will also heat-up more than over-inflated ones. Depending on the tyre this can be a good/bad thing.
what pressure should i be pumping my tryes up to to achieve the best performance?
There was a post somewhere about this stick 36/7 in the fronts and 35 in the rears..
depending what size wheels !, i had aftermarket 18" and was running 38-39 all round to keep even tread wear!..
Lots of threads on this (fairly) hot topic for the Stilo.
A greater footprint (lower pressure) will give you better grip and also a softer ride.
Higher pressure will always return better mpg. It will also tend to reduce uneven tyre wear and tyre wear in general but does generate a harsher ride.
For performance considerations it's important to remember that tyre pressure is very tyre dependent and excessive pressure can degrade grip quite significantly (excessively under-inflated can be just as bad of course - although this tends to degrade the handling of the car rather than any actual reduction in grip)
A greater footprint (lower pressure) will give you better grip and also a softer ride.
Higher pressure will always return better mpg. It will also tend to reduce uneven tyre wear and tyre wear in general but does generate a harsher ride.
For performance considerations it's important to remember that tyre pressure is very tyre dependent and excessive pressure can degrade grip quite significantly (excessively under-inflated can be just as bad of course - although this tends to degrade the handling of the car rather than any actual reduction in grip)
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