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Increase tyre pressures, improve steering? #572057
15/04/19 02:40 PM
15/04/19 02:40 PM
Joined: Jul 2018
Posts: 129
Salisbury Plain
G
Gareth H Offline OP
L - Learner Plates On
Gareth H  Offline OP
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G

Joined: Jul 2018
Posts: 129
Salisbury Plain
I did an airfield activity day on Friday, and as recommended increased tyre pressures, as there is the (unlikely) risk of the tyre falling off the rim with the sideways loads, it happened to an mx5 last time I was there, but he hadn't checked his pressures and the other 3 were at circa 15psi, so his own fault.
I have been running at 25 psi, which I increased to 30, didn't get round to dropping the pressure back down again after the day, and have been using the car today.
Well I have always thought that the steering was a little strange, difficult to explain, but doesn't feel very linear, and a bit bottom clenching if travelling quickly and having to make adjustments mid bend.
Running the higher pressures has totally changed steering feel, it has become very positive on turn in and much less dramatic making mid corner adjustments.
Anybody else had similar experiences?
S5 on 19" rims with Conti tyres.
G


Gareth
Aero 8
R Nine T
335d
BMW Power!
Re: Increase tyre pressures, improve steering? [Re: Gareth H] #572066
15/04/19 03:31 PM
15/04/19 03:31 PM
Joined: Feb 2016
Posts: 1,149
Buckinghamshire
NickCW Offline
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That is very interesting, as Morgan suggest running lower pressures but when speaking to a Michelin technical rep he suggested to go with about 30 all round..


Aero 8 S1

"What we do in life.. echoes in eternity."
Re: Increase tyre pressures, improve steering? [Re: Gareth H] #572079
15/04/19 04:38 PM
15/04/19 04:38 PM
Joined: Jul 2014
Posts: 1,254
Newcastle Upon Tyne
James B W Offline
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hmmn thinking - could be tempted to try this........

James


Aero8 , Series 1 - Boston Green
Range Rover Evoque
Smart Brabus Convertible
Re: Increase tyre pressures, improve steering? [Re: NickCW] #572144
15/04/19 09:18 PM
15/04/19 09:18 PM
Joined: Dec 2013
Posts: 889
Newton Abbot, South Devon UK
Felix42 Offline
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Felix42  Offline
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Newton Abbot, South Devon UK
Originally Posted By NickCW
That is very interesting, as Morgan suggest running lower pressures but when speaking to a Michelin technical rep he suggested to go with about 30 all round..


There is a high risk of understeer if tyres are overpressured.


John

Silver 2005 S1 Roadster V6 - Henrietta
Re: Increase tyre pressures, improve steering? [Re: Felix42] #572163
16/04/19 05:24 AM
16/04/19 05:24 AM
Joined: Jul 2018
Posts: 129
Salisbury Plain
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Gareth H Offline OP
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Gareth H  Offline OP
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Joined: Jul 2018
Posts: 129
Salisbury Plain
Originally Posted By Felix42
Originally Posted By NickCW
That is very interesting, as Morgan suggest running lower pressures but when speaking to a Michelin technical rep he suggested to go with about 30 all round..


There is a high risk of understeer if tyres are overpressured.


It's certainly not understeering


Gareth
Aero 8
R Nine T
335d
BMW Power!
Re: Increase tyre pressures, improve steering? [Re: Gareth H] #572201
16/04/19 08:24 AM
16/04/19 08:24 AM
Joined: Dec 2013
Posts: 889
Newton Abbot, South Devon UK
Felix42 Offline
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Felix42  Offline
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Newton Abbot, South Devon UK
If you car's front tyres loose adhesion because they are over pressured and it carries straight on when you turn the steering wheel, isn't that understeer? Or am I missing something?


John

Silver 2005 S1 Roadster V6 - Henrietta
Re: Increase tyre pressures, improve steering? [Re: Gareth H] #572203
16/04/19 08:25 AM
16/04/19 08:25 AM
Joined: May 2009
Posts: 3,628
Hill Head, Hampshire, Uk
Frank 4x4 Offline
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Hill Head, Hampshire, Uk

I always go just 2.5lbs higher when re inflating as the Mog Spokes will lose pressure over time.

The Roadster 100 steers superbly and did Jink well when needed to avoid the middle of the roaders coming at me.

I have no Idea of the legal implications on liability - if one is unfortunate to be in an accident with well over the recommended tyre pressures and the car is taken away and Police Checked, as my shortened and undrivable Volvo was, when I was unfortunate to be stationary in the middle of a three vehicle shunt?

Frank.



Frank


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Re: Increase tyre pressures, improve steering? [Re: Felix42] #572236
16/04/19 11:29 AM
16/04/19 11:29 AM
Joined: Jul 2018
Posts: 129
Salisbury Plain
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Gareth H Offline OP
L - Learner Plates On
Gareth H  Offline OP
L - Learner Plates On
G

Joined: Jul 2018
Posts: 129
Salisbury Plain
Originally Posted By Felix42
If you car's front tyres loose adhesion because they are over pressured and it carries straight on when you turn the steering wheel, isn't that understeer? Or am I missing something?

Sorry have I missed something? The steering is much more positive on turn in with the higher pressure, I understand that understeer / oversteer can be effected by increasing / reducing tyre pressures on one axle, I have increased all pressures, so the balance remains the same (as far as I understand).


Gareth
Aero 8
R Nine T
335d
BMW Power!
Re: Increase tyre pressures, improve steering? [Re: Gareth H] #572258
16/04/19 01:35 PM
16/04/19 01:35 PM
Joined: Dec 2013
Posts: 889
Newton Abbot, South Devon UK
Felix42 Offline
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Felix42  Offline
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Joined: Dec 2013
Posts: 889
Newton Abbot, South Devon UK
If tyre pressure is too high, then less of the tyre touches the ground. As a consequence, your car will bounce around on the road. And when your tyres are bouncing instead of firmly planted on the road, traction suffers and so do your stopping distances. You'll also feel a decrease in ride comfort.
It is a common misconception that overinflating your tyres will provide more responsive handling and greater fuel efficiency. In fact, over-inflation is detrimental to the tyres and can be dangerous. For the best handling and fuel efficiency, you should adhere to the manufacturer's optimum tyre pressure.


John

Silver 2005 S1 Roadster V6 - Henrietta
Re: Increase tyre pressures, improve steering? [Re: Gareth H] #572260
16/04/19 01:40 PM
16/04/19 01:40 PM
Joined: Sep 2011
Posts: 11,429
Mandello del Lario, Lake Como,...
Gambalunga Offline
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Mandello del Lario, Lake Como,...
You could always check with the chalk method described on http://eastcoastoverlandadventures.blogspot.com/2016/07/tire-pressure-management.html

There is an interesting tool that PJB told me about at
http://paws.kettering.edu/~amazzei/tire_calculator.html

It allows you to compare tyres of different characteristics and pressures etc.


Peter

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