Higher tyre pressures and their advantages .

discopotato03 · Post by **discopotato03** » Sun Mar 14, 2010 11:54 pm

Hi all , I found to my disgust that the preset type servo air supply system I had been using was telling me porkies . I went to a new servo near home and was surprised to see 25 pounds all round which I set to my been doing it for 20 + years 32 pounds .
I had a talk to Coxy about it and he said his Brumby was always set to 36 pounds hot , he reckoned its a tad jiggly but the old 81 needs all the help it can get . So I set mine the same and let me tell you it makes my RX better in most ways . The first thing you notice is that it feels all imperfections in the road surfaces , sort of like Bilstein dampers with their typically over damped low speed settings . The second is how much less rolling resistance my car now has . It corners a lot better because the tyres obviously hold their shape and don't flex as much in the side walls as they used to .
I was most interested to see what this would do for my weekly fill up and fuel consumption though exhaust changes and a bit more stick throws in other variables .

If you don't mind a slightly harsher ride you could give this a go though you need to look at your tyres and see what they say pressure rating wise .
Always remember to set tyre pressures at running temperature because if you do them cold the pressure will increase as the tyre/wheel warms up .

So free handling and consumption improvements and the trade off may be a slightly harsher ride on so so road surfaces .

Works for me , cheers A .

SuBaRiNo · Post by **SuBaRiNo** » Mon Mar 15, 2010 12:22 am

Im not arguing your case... i agree with what u have said.

I found with my hatch though that running lower PSI assists me in getting traction on the road with my FWD box. The higher my pressure is the slower i have to accelerate at the traffic lights or i start doing squealies. I found about 25PSI helps me with this.

Dave

Dave

discopotato03 · Post by **discopotato03** » Mon Mar 15, 2010 1:12 am

I can see that being a problem , I got around that with an AWD L box but not a cheap exercise .

Cheers A .

Post by **TOONGA** » Mon Mar 15, 2010 9:26 am

Im runing 40 psi in my tyres 215/65 r14 Its like driving a skateboard on gravel and you feel every bump, lump and rattle but Im noticing better tyre wear and fuel economy as well

TOONGA

twilightprotege · Post by **twilightprotege** » Mon Mar 15, 2010 1:35 pm

38psi is where i put my tyres. mainly for economy, but also handling and tyre wear.

i always recommend adjusting the pressures after the car has been sitting overnight.

Post by **Alex** » Mon Mar 15, 2010 1:54 pm

this is a query ive never been quite clear on. I have low profile tyres on my liberty, and i run about 38psi in them. I remember hearing once to run higher pressure in low profile tyres. Is this true or utter b/s?

alex

steptoe · Post by **steptoe** » Mon Mar 15, 2010 2:30 pm

Many of the newer tyres are coming out with 45 psi as a recomended inflation maximum, so, tyres are-a-changing. I know an old, scratch that, former driver training instructor as in Babe, Bacon,Bacon,Bacon, plod, plod, plod, and he passed on tyre pressure info to his charges as in run them at max recommended pressure for safety an performance. Tyre wear was someone elses problem.

edit >> SHEESUS, speak of the devil! Near enuff turns up on the doorstep as I typed that !! Not seen him in 12 months ....

AlpineRaven · Post by **AlpineRaven** » Mon Mar 15, 2010 4:17 pm

Ive always sat at 46psi in my Liberty with 215/45 17" tyres.
Cheers
AP

Post by **Alex** » Mon Mar 15, 2010 4:59 pm

AlpineRaven wrote:Ive always sat at 46psi in my Liberty with 215/45 17" tyres.
Cheers
AP

intersting...i mite do this and see what sort of differences i get. I already have a pretty harsh ride due to the lowering king springs. So hoepfully that cant get any worse haha.

alex

AlpineRaven · Post by **AlpineRaven** » Mon Mar 15, 2010 8:54 pm

Keffa wrote:intersting...i mite do this and see what sort of differences i get. I already have a pretty harsh ride due to the lowering king springs. So hoepfully that cant get any worse haha.

alex

It will get worse, at the moment i have std suspensions and going to Bilstein soon, its comfortable on highway but slow speeds its abit harsh.
Cheers
AP

Post by **Alex** » Mon Mar 15, 2010 9:36 pm

AlpineRaven wrote:It will get worse, at the moment i have std suspensions and going to Bilstein soon, its comfortable on highway but slow speeds its abit harsh.
Cheers
AP

yup...just did them to 46psi...my tyres are exactly the same size as yours. and it is noticeably rougher haha.

someguy · Post by **someguy** » Tue Mar 16, 2010 2:31 pm

I'm running 40PSI on my 185/70/R13's (tyres states to inflate to max of 45)

Its a little bumpy but seems to help the old EA82 out running at a higher PSI.