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[Jay w]

i regularly introduce the rev needle to the redline, i has got to be done  

[cem_devecioglu]

Winter tyres 32 front 30 back..

Normal tires 30 front 28 back... Long journeys  29 front  28 back (summer)

tried 225 km/h..if the measurement is OK.

[Kevin Wood]

I have 235/40/17's on the front and 265/40/17's on the rear and I had been running mine at slightly lower pressures since I had new tyres put on as the previous tyres (rears) had shown signs of over inflation by wearing in the middle. Big Rod (the previous owner) said he had normally run them at 30psi all round, so I've been running them at 28psi.
Since then I noticed my mpg reduced to around 22 on average to and from work. I checked my pressures last night and they were slightly down on the original 28psi I put in a few weeks ago, so thought I'd try them back at 30psi as these tyres are a slightly softer compound than the last set. I reset my MID this morning and was amazed that after my 22 mile journey to work my average mpg had gone up to over 25.

It will be interesting to see what average mpg I get going to Newent this weekend. :-?

Dont forget tho Bob......the rears should be 3psi higher than the fronts on estates.....i assume that applies for your 265's as well.

I run my 225's 30 front and 33 back  

Tho my tyres take abuse......coz one min it can be just me in it......10mins later 4 15 stone passengers    

I did once inflate to 33 front 36 back as a comprimise.......but overinflation wear started showing after a time.

With normal wheels and tyres I'd agree Dave, but the tyres that came off the rear were worn in the middle which would indicate over inflation. I'm going to see Tony at WIM tomorrow so I'll see what he recommends.

True. Change the tyre size and the contact patch changes in area so the pressure required will be totally different and it's best to experiment. With those hoofing great tyres on the rear I suspect the ideal pressure will be quite a bit lower on the back than the book pressure. It all depends, for each wheel, on the weight it's carrying against the area of the contact patch.

Taking the extreme example I've got 205/50/15s on my Westfield, which weighs in a tonne less than an Omega and I reckon about 17-18 PSI all round is the best pressure. I had to experiment a bit to arrive there. Putting more air in makes it feel quite taught and responsive at first, and you can go quite high on pressure with no ill effects but you realise that there's less grip if you push it, and tyre wear will eventually confirm it. If you go a pound or two under the ideal, it quickly gets a bit vague and tends to let go when pushed.

Kevin

[familyman]

Does anyone other than me use bar instead of psi or am i getting to modern

[Kevin Wood]

Does anyone other than me use bar instead of psi or am i getting to modern

Always used PSI for tyres and, although I'd use bar when talking about most other things I haven't got a clue what a sensible tyre pressure in bar would be :-/

Kevin

[CaptainZok]

Does anyone other than me use bar instead of psi or am i getting to modern

Always used PSI for tyres and, although I'd use bar when talking about most other things I haven't got a clue what a sensible tyre pressure in bar would be :-/

Kevin

Ask Spongebob he's the baa expert.  

[TheBoy]

Does anyone other than me use bar instead of psi or am i getting to modern

I use mm etc rather than the rubbish that the old timers use  , but still use PSI - 32PSI seems better than 2.1bar (or whatever it is)...

[omegaman2]

after holiday season i did not put pressures down  ( lazy ) 36f 42b for caravan, the ride was harsh and back tires were worn down to limit in middle but 000;s miles left side treads ...anyway 4 corners replaced and tyre man put 36 in each not to bad but i reduced to 30 allround and now have magic carpet ride smooth & quiet

[cem_devecioglu]

Does anybody use here nitrogen..Think it better than air

[Kevin Wood]

Does anybody use here nitrogen..Think it better than air

Never tried it although my local tyre depot has a sign up saying they'll use it on request (for a fee).

Because it contains no water vapour the tyre pressure remains much more stable over a wide range of temperatures. Not sure tyre pressure is that critical on an Omega, nore does tyre temperature really vary over such a great range but it's useful in motorsport where you'll always be chasing the right tyre pressure and getting serious heat into the tyres at the same time.

I remember watching a documentary on a Le Mans team in the run-up to the 24h and they were chasing all sorts of suspension setup problems until someone noticed that the tyre pressures had gone to pot after a fast run. Turns out the tyre fitter had put moist air into the tyres.

Kevin

[cem_devecioglu]

Does anybody use here nitrogen..Think it better than air

Never tried it although my local tyre depot has a sign up saying they'll use it on request (for a fee).

Because it contains no water vapour the tyre pressure remains much more stable over a wide range of temperatures. Not sure tyre pressure is that critical on an Omega, nore does tyre temperature really vary over such a great range but it's useful in motorsport where you'll always be chasing the right tyre pressure and getting serious heat into the tyres at the same time.

I remember watching a documentary on a Le Mans team in the run-up to the 24h and they were chasing all sorts of suspension setup problems until someone noticed that the tyre pressures had gone to pot after a fast run. Turns out the tyre fitter had put moist air into the tyres.

Kevin

Yep.Nitrogen is not effected by temperature changes like normail air..And I feel its more comfortable than air..Here the temperature changes in night and day and driving conditions change the tires for higher pressures and make the omega jump jump  

[Crazydad]

Up to now i have allways used nitrogen in all my vehicles, but the Omega has such a smoooooth ride that i

don`t find it necessary.

The only thing is i have to check my pressures more often, 2,3 bar all round low mpg nice ride

[Kevin Wood]

Interesting. I never knew it influenced ride quality. Maybe I'll try it next time.

Kevin

[SP_3.2]

Any thing to keep the MPG on the right side. How much is 2-3 bar in PSI?.

Thanks.  

[cem_devecioglu]

nearly 33.36 psi =2.3 bar