[aalaap]

Originally Posted by [b

Quote[/b] ]Higher tire pressure decreases your rolling resistance, (which makes it easier for the engine to move the car...which improves efficency).

Sounds good, thanks!

Originally Posted by [b

Quote[/b] ]So in the end you are left with the usual spectrum of ~28-34psi, so if you want to suffer a bumpy ride you could run a higher pressure in the city...

Whats a safe higher pressure? Is it the same for the front and rear? I don't know much about this.

- Aalaap

[Shan2nu]

Well, in tubed tyres the thing is that, running it with a little xtra pressure reduces the friction between the tube and the tyres, thus reducing heat buildup.

For tubeless tyres, i don't think is matters that much.

Shan2nu

[Rehaan]

Originally Posted by [b

Quote[/b] (aalaap @ Nov. 06 2004,19:55)]

Whats a safe higher pressure? Is it the same for the front and rear? I don't know much about this.

Well you have a zen right?
So i guess it would make sense to have slightly lower pressure at the back to prevent it from bouncing around like crazy ? (my guess).

Give it a shot with 32front 30rear and see if thats bearable... if it is u can continue to increase it or if not decrease it.....!

Infact a good example of the rolling resistance thing is whenu go into the pump with really low tire pressure and get it filled up till normal and then the car just seems to move so much more easily off the spot.

cheers
R

[SLK]

I don't remember zen's pressures... but I think it runs much below the 32psi mark. So with 32 it just might.. feel like.. a rock hard ride!
Worst thing maruti did!.. is to put 80 profile tyres in zen. with these tyres the steering feels vague (same with my alto)

[speedsatya]

guys,
maruti says 32psi for the wagon r vsi with 155/65r13 tires.
so wat shud it be for the zen with 155/65r13 for which maruri says 30psi with 145/70r13.

[SLK]

and I guess maruti says 24psi for zen with 80 profile tyres.
my way?... keep it 28-30.
and wagonR is a heavier thing... so I don't think u should use 32-33psi on zen.

[speedsatya]

Originally Posted by [b

Quote[/b] (SLK @ Nov. 14 2004,20:23)]and I guess maruti says 24psi for zen with 80 profile tyres.
my way?... keep it 28-30.
and wagonR is a heavier thing... so I don't think u should use 32-33psi on zen.

slk,
28-30psi is too high for 145/80r12 in a zen as it tends to bounce on the rd.
26psi was ok.
i have kept 25 psi with 155/65r13 as maruti says32psi for the wagon r vxi with the same tire.

[SLK]

Originally Posted by [b

Quote[/b] (speedsatya @ Nov. 15 2004,12:42)]28-30psi is too high for 145/80r12 in a zen as it tends to bounce on the rd.
26psi was ok.
i have kept 25 psi with 155/65r13 as maruti says32psi for the wagon r vxi with the same tire.

hmm.. probably 28-30 is too high for zen.
but.. I don't quite understand.. Alto with same tyres runs 30psi. And also weighs only a little more than zen!

[amitoj]

Originally Posted by [b

Quote[/b] (SLK @ Nov. 14 2004,20:23)]and I guess maruti says 24psi for zen with 80 profile tyres.
my way?...

that explains why the stupid air pressure guy at the petrol pump keeps insisting i should keep the pressure in my tyres at 24. Doesnt realise i have 145/70 r13 tyres and not ones with profile of 80.

[Shan2nu]

This is a continuation of This thread

I usualy keep 28-26 - front/rear (normal is 30/28) and the car keeps rock steady at 120.

Any particular reason why your rear tyre pressure is set to 26? Don't think that's a good idea.

Shan2nu

[speedsatya]

Originally Posted by umeshd

I1) Tyre pressure - since the concrete road gets tyres heated fast. I usualy keep 28-26 - front/rear (normal is 30/28) and the car keeps rock steady at 120.

hey umesh,

its not safe to keep lesser air in ur tires at expressway speeds.in this way your tires will get more hot.

it is usually recommended to keep 2-3psi more on the expressway.

[amitoj]

Originally Posted by speedsatya

hey umesh,

its not safe to keep lesser air in ur tires at expressway speeds.in this way your tires will get more hot.

it is usually recommended to keep 2-3psi more on the expressway.

hmmm... speedy got a good point there, umesh... is the advantage in stability really worth the risk u taking there? in case u get a tyre burst... how much diff does it make to car control when going from 33 to 0 instead of 28 to 0? wots ur car's max speed?
pray tell....

[normally_crazy]

Originally Posted by speedsatya

hey umesh,

its not safe to keep lesser air in ur tires at expressway speeds.in this way your tires will get more hot.

it is usually recommended to keep 2-3psi more on the expressway.

correct me satya but if u keep the pressure 28 psi and the tyre gets heated on the road ....the air inside will expand thus increasing pressure......right???

so i think keeping the pressure 28 psi will ultimately result in the pressure increasing when the car is running ....someone help me out here ?

[amitoj]

Originally Posted by normally_crazy

correct me satya but if u keep the pressure 28 psi and the tyre gets heated on the road ....the air inside will expand thus increasing pressure......right???

so i think keeping the pressure 28 psi will ultimately result in the pressure increasing when the car is running ....someone help me out here ?

hmmm... keeping a lower pressure will result in more increase in the temperature than if it were normal pressure... no? i thot one shd keep lower pressure only when more than normal grip on the road is required... for example dusty terrain... or wet surface.

Someone help us all out here!!

[Shan2nu]

so i think keeping the pressure 28 psi will ultimately result in the pressure increasing when the car is running ....someone help me out here ?

The thing is that, using lower tyre pressure increases rolling friction and if you have a tube inside, there is bound to be friction between the tube and the tyre as well.

Not to forget the strain, on the sidewalls.

Believe it or not, but increasing tyre pressure by 1-2 psi reduces the rate of pressure increase, due to heat.

Shan2nu