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 Tyre air - is it a must to follow exactly?

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TSwatabakiu
post Feb 2 2017, 01:02 AM, updated 7y ago

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Out of sheer curiosity... Is it ok to pump more/less air than advised? i am talking about +-2psi more/less.

or must follow exactly as advised?

my new sets of tires seem to be a bit lumpy (?) like not enough air when i follow the psi required, and that is without load. for the record, the tyre brand is different than the stock tyre, but the specs remain.


Cruxs
post Feb 2 2017, 01:28 AM

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Many reason tyre become lumpy. Tyre brand, type, load, road condition. + - 2psi still in tolerance. But nvr exceed max advised.
matrix88
post Feb 2 2017, 01:34 AM

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tyre brand different nevermind, size matters. it is best to follow to recommended tyre pressure by car maker. if it is too low, your fuel economy suffers, if pressure too high, car is very bumpy and unstable at high speed, car seems to be floating. side of the tyre patch is not touching the road. very dangerous
ktek
post Feb 2 2017, 09:35 AM

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usually i pump extra. then slowly release each 1-2day until satisfy.
zeng
post Feb 2 2017, 09:47 AM

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2 psi more than OEM recommended pressure is ok, as it's way below tyre manufacturer's maximum permissible pressure.
2 psi below would not be ok at designed loads, as it promotes tyre overheating and potential tyre burst at prolonged high speed.
I typically fill air up to 30 % higher than OEM recommendation for agility and better fuel economy with acceptable increased ride harshness.

This post has been edited by zeng: Feb 2 2017, 09:50 AM
Actchan
post Feb 2 2017, 02:11 PM

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QUOTE(zeng @ Feb 2 2017, 09:47 AM)
2 psi more than OEM recommended pressure is ok, as it's way below tyre manufacturer's maximum permissible pressure.
2 psi below would not be ok at designed loads, as it promotes tyre overheating and potential tyre burst at prolonged high speed.
I typically fill air up to 30 % higher than OEM recommendation for agility and better fuel economy with acceptable increased ride harshness.
*
30% higher than oem ? wow @@

Let say oem is 30psi so you inflat till 38psi up ?
6UE5T
post Feb 2 2017, 03:53 PM

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QUOTE(watabakiu @ Feb 2 2017, 01:02 AM)
Out of sheer curiosity... Is it ok to pump more/less air than advised? i am talking about +-2psi more/less.

or must follow exactly as advised?

my new sets of tires seem to be a bit lumpy (?) like not enough air when i follow the psi required, and that is without load. for the record, the tyre brand is different than the stock tyre, but the specs remain.
*
Recommended tire pressures on the door sticker is also not really accurate or must be strictly followed. It serves more as a starting point for you to adjsut until you find the right one for you. It depends on your preference how you like the car to handle. If you feel the recommended pressures is too hard then can reduce bit by bit but usually don't go too low below 28psi. On the other hand if you feel it's too soft then can also increase bit by bit until you find the sweet spot for you, as long as it's not exceeding the max pressures. Note though over inflating a bit higher than recommended is generally less risky than under inflating it by the same amount coz under inflation can cause heat build up easier during high speeds. That's why I personally almost always inflate around 2-3psi higher than recommended. Over inflating a bit also serves as an extra margin so that when you loose pressure you will still arrive at around the recommended pressure and not too low below it.
zeng
post Feb 2 2017, 04:27 PM

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QUOTE(Actchan @ Feb 2 2017, 02:11 PM)
30% higher than oem ? wow @@

Let say oem is 30psi so you inflat till 38psi up ?
*
That's right, up to 30% overpressure.
Wira 1.5 recommends 29 psi all round . Mine is 37 psi.
Had been monitoring for several years, no premature wear (uneven botak) at the tyre centreline area.

This post has been edited by zeng: Feb 2 2017, 04:28 PM
TSwatabakiu
post Feb 3 2017, 06:19 PM

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Mine recommends 32psi front, 29 back. makes sense to have both to be at, say, 32psi? No reasons whatsoever, just a moot idea for discussion.
6UE5T
post Feb 3 2017, 06:26 PM

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QUOTE(watabakiu @ Feb 3 2017, 06:19 PM)
Mine recommends 32psi front, 29 back. makes sense to have both to be at, say, 32psi? No reasons whatsoever, just a moot idea for discussion.
*
Usually tire pressure recommendation is largely determined based on the weight distribution. If the car is front heavy much more, then usually the recommended pressures are higher for the front. If you make them even then you may feel the rear becomes a bit jumpy/harsh, unless you have extra load at the back.
JTLMELB
post Feb 4 2017, 09:35 AM

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Passenger car size 13-14" normally 34 Psi
15-16" " 36 Psi

Above pressure just based on the road condition like highway. This is mostly tyre store did at down under. Of course those particular driver will inflate to suit their handling.


zeng
post Feb 4 2017, 10:16 PM

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QUOTE(JTLMELB @ Feb 4 2017, 09:35 AM)
Above pressure just based on the road condition like highway.

Nooo ......

This ..
QUOTE(6UE5T)
Usually tire pressure recommendation is largely determined based on the weight distribution.


This post has been edited by zeng: Feb 4 2017, 10:18 PM
TSwatabakiu
post Feb 4 2017, 10:39 PM

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I added 2 more psi than the car manual recommendation. car feels a bit more bumpy/harsh and noisier.

Not sure if it is because I am more aware of it now, or i better to follow the recommended tyre pressure advised by the car manufacturer
6UE5T
post Feb 5 2017, 12:16 AM

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QUOTE(watabakiu @ Feb 4 2017, 10:39 PM)
I added 2 more psi than the car manual recommendation. car feels a bit more bumpy/harsh and noisier.

Not sure if it is because I am more aware of it now, or i better to follow the recommended tyre pressure advised by the car manufacturer
*
If you feel too harsh then just lower it back to std recommendation, maybe that's already the best compromise between handling and comfort.
:3mushy:3
post Feb 6 2017, 06:21 PM

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Depends on weight, take base 32 PSI and 90% drive alone. I usually pump to 33 PSI to compensate for the infamous road conditions in Malaysia.
TSwatabakiu
post Feb 6 2017, 10:39 PM

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QUOTE(6UE5T @ Feb 5 2017, 12:16 AM)
If you feel too harsh then just lower it back to std recommendation, maybe that's already the best compromise between handling and comfort.
*
I guess so too. I revert back to the recommended tyre pressure and see if there's improvement.
JTLMELB
post Feb 7 2017, 08:08 AM

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QUOTE(zeng @ Feb 5 2017, 01:16 AM)
Nooo ......

This ..
QUOTE(6UE5T)
Usually tire pressure recommendation is largely determined based on the weight distribution.

*
Well, most of the tyre store at Vic inflate with that pressure and no complaint received. Tyre also last quite accurate with mileage estimation.
SUSeksk
post Feb 7 2017, 08:12 AM

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For my myvi 1 psi above recommended is fuel saving.. 2 psi above, the fuel usage increase..
Duckies
post Feb 7 2017, 10:05 AM

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QUOTE(:3mushy:3 @ Feb 6 2017, 06:21 PM)
Depends on weight, take base 32 PSI and 90% drive alone. I usually pump to 33 PSI to compensate for the infamous road conditions in Malaysia.
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Same, I also pump extra +1 PSI for my car. I don't dare to pump extra too much cause I scare the tyre fly out XD
1tanmee
post Feb 7 2017, 11:17 PM

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QUOTE(eksk @ Feb 7 2017, 08:12 AM)
For my myvi 1 psi above recommended is fuel saving.. 2 psi above, the fuel  usage increase..
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not more air = lesser contact to the ground = less drag = lesser fuel meh?

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