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Car tyre pressures [exciting topic alert]

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M.C
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PostPosted: 22:06 - 08 Apr 2017    Post subject: Car tyre pressures [exciting topic alert] Reply with quote
I'm pondering why car tyre pressures (generally) are higher in the front tyres (is it due to engine weight)? Also do tyre pressures influence handling characteristics as dramatically as on a bike (with a couple of PSI making a difference)? Would going higher in the rear eliminate some of understeery nature of a car?
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Rogerborg
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PostPosted: 22:16 - 08 Apr 2017    Post subject: Re: Car tyre pressures [exciting topic alert] Reply with quote
M.C wrote:
I'm pondering why car tyre pressures (generally) are higher in the front tyres (is it due to engine weight)?

Yes.

Diesel Satanmobiles have even higher front pressures because their engines are a solid lump of tortured virgin souls.
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grr666
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PostPosted: 22:26 - 08 Apr 2017    Post subject: Reply with quote
My Swift Sport has two recommended settings

41F 36R Eco mode

36F 33R Comfort mode

It has a kerb weight of just 1045kg

Just had a puncture repaired on it only yesterday. £25 for a puncture repair. Shocked It's been a long time since I had a car
tyre repaired but it was about a tenner going rate last time I did.
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arry
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PostPosted: 22:27 - 08 Apr 2017    Post subject: Re: Car tyre pressures [exciting topic alert] Reply with quote
M.C wrote:
Would going higher in the rear eliminate some of understeery nature of a car?


No not really. Going too far would pronounce oversteer though. Best way to counter understeer is to learn how to use slip angles to your advantage.
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arry
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PostPosted: 22:28 - 08 Apr 2017    Post subject: Reply with quote
grr666 wrote:
My Swift Sport


Fab car. Very underrated.
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grr666
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PostPosted: 22:31 - 08 Apr 2017    Post subject: Reply with quote
Very into the bodyshop this Wednesday due to a slight reversing error on my part. Laughing
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M.C
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PostPosted: 22:53 - 08 Apr 2017    Post subject: Re: Car tyre pressures [exciting topic alert] Reply with quote
Rogerborg wrote:
M.C wrote:
I'm pondering why car tyre pressures (generally) are higher in the front tyres (is it due to engine weight)?

Yes.

Diesel Satanmobiles have even higher front pressures because their engines are a solid lump of tortured virgin souls.

So does an MX-5 run the same in the front/rear as the weight distribution's (I believe) 50/50?

arry wrote:
M.C wrote:
Would going higher in the rear eliminate some of understeery nature of a car?


No not really. Going too far would pronounce oversteer though. Best way to counter understeer is to learn how to use slip angles to your advantage.

I've only driven shit cars, but I was pondering why my work van which runs higher rear pressures (I guess expecting a load), handles a lot better. Obviously other factors are at work, I'm sure the van being wider helps.
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WD Forte
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PostPosted: 23:15 - 08 Apr 2017    Post subject: Reply with quote
I belatedly checked my cars tyre pressures last week
and found the NS rear was 12 psi !
Embarassed
I had no idea when driving it

The bike would have thrown me off if I did that on it
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UncleFester
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PostPosted: 07:27 - 09 Apr 2017    Post subject: Reply with quote
If my Aygos pressures are out - can't tell a thing. If the S2000 has different pressures in the rears by even 2 PSI you really know about it. It will squirm around under load, most disconcerting.
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arry
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PostPosted: 07:58 - 09 Apr 2017    Post subject: Re: Car tyre pressures [exciting topic alert] Reply with quote
M.C wrote:

So does an MX-5 run the same in the front/rear as the weight distribution's (I believe) 50/50?


Think about weight transfer rather than static distribution.
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RhynoCZ
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PostPosted: 11:58 - 09 Apr 2017    Post subject: Re: Car tyre pressures [exciting topic alert] Reply with quote
M.C wrote:
I'm pondering why car tyre pressures (generally) are higher in the front tyres (is it due to engine weight)? Also do tyre pressures influence handling characteristics as dramatically as on a bike (with a couple of PSI making a difference)? Would going higher in the rear eliminate some of understeery nature of a car?


My car is 2.1BAR / 2.3BAR (front/rear). Yes, lower/higher tyre pressure does influence driving.

Low pressure (all 4 wheels, or 2 wheels at the same axle) = car will feel very spongy on the road.
Low pressure in only one of the wheels = the car won't probably go straight. You're gonna need to use some steering input to keep the car going straight (I noticed that when my rear right tyre was very low).
High pressure = hard ride, not as stable as you'd think + reduced grip, the tyres will get uneven wear (the center of the tyre will get bald sooner than the outer lines of the thread). Higher pressure (mostly at the rear axle) helps when the car is fully loaded with passangers and cargo.

Now, it seems to me FWD cars preffer more air in the front wheels. So the driven axle seems to be the deciding factor.

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IF you want stability, go with larger wheels and lower side walls. That's where all the wobbliness is. But beware, the driving comfort will reduce.
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Baggyman
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PostPosted: 12:24 - 09 Apr 2017    Post subject: Re: Car tyre pressures [exciting topic alert] Reply with quote
RhynoCZ wrote:

Now, it seems to me FWD cars preffer more air in the front wheels. So the driven axle seems to be the deciding factor.



Nope. FWD cars have relatively more weight over the front than RWD due to the positioning of the gearbox and axle. More weight = more air pressure.

FWD is all to do with manufacturing cost. FWD cars are cheaper to build as the engine/gearbox/steering/front suspension etc. can be installed as one unit
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Jewlio Rides Again LLB
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PostPosted: 12:27 - 09 Apr 2017    Post subject: Reply with quote
Mine has more pressure in the rear. Checked mine for the first time since about June last year (new tyres). About 10psi down all round. 35 front 36 year.
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Kickstart
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PostPosted: 12:36 - 09 Apr 2017    Post subject: Re: Car tyre pressures [exciting topic alert] Reply with quote
M.C wrote:

So does an MX-5 run the same in the front/rear as the weight distribution's (I believe) 50/50?


They do run the same tyre pressure front and back. Not sure they have 50/50 weight distribution though

All the best

Katy
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arry
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PostPosted: 12:39 - 09 Apr 2017    Post subject: Reply with quote
Jewlio Rides Again wrote:
Mine has more pressure in the rear. Checked mine for the first time since about June last year (new tyres). About 10psi down all round. 35 front 36 year.


So does mine. But that is where the engine lives.
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RhynoCZ
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PostPosted: 12:48 - 09 Apr 2017    Post subject: Re: Car tyre pressures [exciting topic alert] Reply with quote
Baggyman wrote:
FWD is all to do with manufacturing cost. FWD cars are cheaper to build as the engine/gearbox/steering/front suspension etc. can be installed as one unit


Have we both seen the exact same video: https://www.youtube.com/watch?v=YU5KHeE_YYI ?Thinking

Baggyman wrote:
Nope. FWD cars have relatively more weight over the front than RWD due to the positioning of the gearbox and axle. More weight = more air pressure.


I just checked other RWD cars from Mercedes-Benz and all of them have either lower pressure on the front axle or the same pressure on both axles. Some of those cars have V8 and V12 engines on the front axle. W210 had inline four 2.0L petrol to 4.3L V8 + various diesel engines.
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