Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: JamesV6CDX on 27 February 2007, 23:54:37

Title: Tyre pressures
Post by: JamesV6CDX on 27 February 2007, 23:54:37
Just checked mine, and they were a bit out.

Front Passenger: 32psi
Front Driver: 29psi
Rear Passenger: 30psi
Rear Driver: 29psi

Firstly, could this account for any drop in MPG? Can't see it myself, not enough to notice anyway..

Secondly, what is the recommended tyre pressure for the Meega? My tyres are only babies.. 185's.. I have set them all as 33psi for now, but could do with a recommendation..

:)

Title: Re: Tyre pressures
Post by: HI2DVY on 28 February 2007, 00:26:55
According to manual, should be 30psi front and back... unless under load - front 36, rear 42 - for all models except 3.0/3.2.

HTH

Dave
Title: Re: Tyre pressures
Post by: Auto Addict on 28 February 2007, 06:41:35
I run mine @ 31, just for the hell of it.
Title: Re: Tyre pressures
Post by: Gaffers on 28 February 2007, 11:34:57
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I run mine @ 31, just for the hell of it.

What he said....
Title: Re: Tyre pressures
Post by: BazMV6 on 28 February 2007, 16:15:28
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According to manual, should be 30psi front and back... unless under load - front 36, rear 42...

That always struck me as an odd statement... So "under load" I suddenly put another 6lb in the front and 12lb in the back?  At what magic "load" should this happen?  Surely I should gradually increase the pressure depending on the load, up to a maximum when "loaded".  But I can't even start to calculate that without knowing the definition of "load"...  :(

Grumpy old man of Silverstone.
Title: Re: Tyre pressures
Post by: tunnie on 28 February 2007, 17:00:37
Quote
Quote
I run mine @ 31, just for the hell of it.

What he said....

Same here, book says 30.5.

I put them at 31.
Title: Re: Tyre pressures
Post by: TheBoy on 28 February 2007, 18:51:19
I personally run 35 in front and 32 in rear.  This is a result of 1 yr of pressure fiddling...
Title: Re: Tyre pressures
Post by: Danny on 28 February 2007, 20:09:04
my car came with no books, and also, i changed the wheels to elites on 235/45/17s, what should my tyre pressure be? they say on the actual tyre Max 51psi but obviously ya dont go anywhere near!
Title: Re: Tyre pressures
Post by: TheBoy on 28 February 2007, 20:12:59
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my car came with no books, and also, i changed the wheels to elites on 235/45/17s, what should my tyre pressure be? they say on the actual tyre Max 51psi but obviously ya dont go anywhere near!
The 235s on prefacelift MV6 are stated at 32 all round, or 38F and 45R for load...
Title: Re: Tyre pressures
Post by: Tony H on 28 February 2007, 20:57:25
Quote
my car came with no books, and also, i changed the wheels to elites on 235/45/17s, what should my tyre pressure be? they say on the actual tyre Max 51psi but obviously ya dont go anywhere near!
Same size wheels as mine I run them at 32 lbs psi all round
Title: Re: Tyre pressures
Post by: Chopsdad on 28 February 2007, 22:14:38
225/55/16 on mine and book at 30 all round
Title: Re: Tyre pressures
Post by: Danny on 28 February 2007, 22:40:21
i think mine are at 35

i load it up with post bags every mornin anyway, dont know whether that has much of an effect!
Title: Re: Tyre pressures
Post by: Essex_Andy on 28 February 2007, 22:47:35
running stock size 205/65 R 15 and running 32psi all round
Title: Re: Tyre pressures
Post by: HI2DVY on 28 February 2007, 23:01:57
Quote
Quote
According to manual, should be 30psi front and back... unless under load - front 36, rear 42...

That always struck me as an odd statement... So "under load" I suddenly put another 6lb in the front and 12lb in the back?  At what magic "load" should this happen?  Surely I should gradually increase the pressure depending on the load, up to a maximum when "loaded".  But I can't even start to calculate that without knowing the definition of "load"...  :(

Grumpy old man of Silverstone.

"Under load" means carrying 3 or 4 passengers and luggage (according to handbook) or, more accurately, standard tyre pressures are for carrying up to 3 persons. Estate pressure are different again. :y
Title: Re: Tyre pressures
Post by: Gaffers on 01 March 2007, 07:33:28
Quote
I personally run 35 in front and 32 in rear.  This is a result of 1 yr of pressure fiddling...

do you not get any uneven wear @ 35?
Title: Re: Tyre pressures
Post by: TheBoy on 01 March 2007, 20:46:27
Quote
Quote
I personally run 35 in front and 32 in rear.  This is a result of 1 yr of pressure fiddling...

do you not get any uneven wear @ 35?
I'm actually getting the opposite of what you would expect - edges wearing...
Title: Re: Tyre pressures
Post by: paolo on 01 March 2007, 21:58:10
I am 32psi all round, i check them each week, as i like to be safe on the winter roads

my ride quality is really smooth too
Title: Re: Tyre pressures
Post by: ians on 01 March 2007, 23:40:39
I do 32 all round with more in the back if I'm lugging heavy stuff from B&Q.

I also get the wear at the edge problem on the front - not sure its pressure related though.
Title: Re: Tyre pressures
Post by: TheBoy on 02 March 2007, 08:01:42
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I also get the wear at the edge problem on the front - not sure its pressure related though.
Inside edge is common on Omega, and is a camber issue.  Inside and outside edges I've not seen except on mine, but then the MK roundabouts won't help...
Title: Re: Tyre pressures
Post by: ians on 02 March 2007, 11:23:23
I've had the inside edge problem on both my cars.  But I've also had the outside edges wear quicker than the centre as well on my 2.5 (on the front)

When you say camber issue,  you mean its out of setting?   Would a full 4 wheel allignment (I forget the exact term) sort this out?

Cheers
Ian
Title: Re: Tyre pressures
Post by: TheBoy on 02 March 2007, 11:29:42
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I've had the inside edge problem on both my cars.  But I've also had the outside edges wear quicker than the centre as well on my 2.5 (on the front)

When you say camber issue,  you mean its out of setting?   Would a full 4 wheel allignment (I forget the exact term) sort this out?

Cheers
Ian
A full geometry is what I would recommend.
Title: Re: Tyre pressures
Post by: Essex_Andy on 02 March 2007, 11:59:48
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A full geometry is what I would recommend.

+1 :y

amazing difference when I had mine done...complete with a free final check and adjust after 2000miles from initial settings.

Tony certainly knows his stuff :)
Title: Re: Tyre pressures
Post by: Essex_Andy on 02 March 2007, 12:01:34
Quote
I'm actually getting the opposite of what you would expect - edges wearing...

Possibly the sidewalls are weak and letting the crown of the tyre lift in the centre.

What tyres do you have and how old and how many miles?
Title: Re: Tyre pressures
Post by: TheBoy on 02 March 2007, 12:32:54
Quote
Quote
I'm actually getting the opposite of what you would expect - edges wearing...

Possibly the sidewalls are weak and letting the crown of the tyre lift in the centre.

What tyres do you have and how old and how many miles?
Dunlop SP9000 235/45ZR17 all round.  This wear pattern only on front. I suspect it may be related to working in MK - roundabout city...  ...and I'm normally in a hurry ::)
Title: Re: Tyre pressures
Post by: theolodian on 02 March 2007, 12:45:55
I need to get my full geometry done.  I think it is more my problem than the wishbones.  But my shocks are bad, so need to do those first.  Need to get the wishbones checked, because no point doing the tracking if those need to be replaced.  So, I need to do the alignment, but it isn't going to happen soon.  Meanwhile the steering is too light and it tramlines, consistent with too much camber, which it definitely has.   >:(

Much better since MDTM tightened up the steering box tho'!  :y
Title: Re: Tyre pressures
Post by: alkifrolick on 06 March 2007, 19:15:50
Someone mentioned estate pressures are different again, any guides for the 2.5 V6 Estate (CDX)

Ta