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[Andy A]

What tyre pressure do you put in your extra load tyres mine are 225/55 R16?

 

[Doctor Gollum]

41 front, 48 rears as per manual 

[iansoutham]

32 psi front and 34psi in the rears under normal usage.

Tracking is set up as per WIM and I have lovely even wear across all 4 tyres.

[Doctor Gollum]

41 front, 48 rears as per manual 

That's to say if likely to be fully loaded

Normal is 34/41iirc

[Andy A]

I came up the motorway with 32 in front and 32 in rear using 225/55 R16 XL Rainsport 3's. 2 people in front, boot and back seats loaded up with stuff and the car was pulling and bouncing all over the road on bends at 70 mph. Not relaxed driving at all.

[Doctor Gollum]

Sounds low, but could be a suspension issue highlighted by the low pressures... Put to max load pressures as above repeat and report back

[iansoutham]

I came up the motorway with 32 in front and 32 in rear using 225/55 R16 XL Rainsport 3's. 2 people in front, boot and back seats loaded up with stuff and the car was pulling and bouncing all over the road on bends at 70 mph. Not relaxed driving at all.

Too low for that much weight.

[Nick W]

I came up the motorway with 32 in front and 32 in rear using 225/55 R16 XL Rainsport 3's. 2 people in front, boot and back seats loaded up with stuff and the car was pulling and bouncing all over the road on bends at 70 mph. Not relaxed driving at all.

Tired springs and shocks would do that. They deteriorate gradually, so you acclimate to them. An unusual load is often enough to make their poor performance more obvious. Fitting four new springs to my car at 190k miles made a massive improvement to the comfort, handling and stance.

[Andy A]

Got new springs on back around 5 months ago @ 128K miles. Will up the Tyre pressures and report back but won't have another full load for 2 weeks. Will report back then.

Thanks for all your advice. 

[TheBoy]

32-34psi, all round. Unless camping (crammed to the gunnells, with roofbox as well), in which case, I might take to 38psi.  235/45/17 or 245/30/18


IIRC 225/55/16 should be slightly less. Whacking up pressure wont help with handling (that's suspension), just make it slide about more.

[aaronjb]

32-34psi, all round. Unless camping (crammed to the gunnells, with roofbox as well), in which case, I might take to 38psi.  235/45/17 or 245/30/18


IIRC 225/55/16 should be slightly less. Whacking up pressure wont help with handling (that's suspension), just make it slide about more.

Unless you've got so much sh*t in the back that the tyres look almost flat. In which case you should have hired a van. I er, don't speak from experience, of course (twice) because overloading a car is illegal and dangerous.

[Doctor Gollum]

32-34psi, all round. Unless camping (crammed to the gunnells, with roofbox as well), in which case, I might take to 38psi.  235/45/17 or 245/30/18


IIRC 225/55/16 should be slightly less. Whacking up pressure wont help with handling (that's suspension), just make it slide about more.

Please read the manual

Specifically pages 227/228. Irmscher wheels came new with a data sheet regarding tyre sizes and pressures

[Andy A]

So its looking like a suspension problem on the back. Last year I had the old springs on but had to change the pair because one was found broken on the mot.So I got the garage to change both rear springs.
 
Carrying the same weight as last year but had different tyres on the back and did not have this problem.

I wounder if the new springs aren't beefy enough or the shocks need changing.  Any advice?

[Andy A]

32-34psi, all round. Unless camping (crammed to the gunnells, with roofbox as well), in which case, I might take to 38psi.  235/45/17 or 245/30/18


IIRC 225/55/16 should be slightly less. Whacking up pressure wont help with handling (that's suspension), just make it slide about more.

Please read the manual

Unfortunutly I left the manual at home. 

[Nick W]

Check the diff mounts and the subframe donuts