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Quick Update - had some fun with the tyre monitor showing uneven inflation. I think the dealer had pumped the tyres up to high pressure (36 psi rears - good for full load or >132mph! ) and the inflation was quite uneven between front and back and between two front tyres. I've now balanced it to more reasonable settings and it's made a surprisingly significant improvement to the ride. Still not "magic carpet" but much closer to what I'd expected. So, if you're thinking of changing a 400 for a 430 its well worth paying attention to ride quality, but now, to my mind, the handling improvements (incomparable) are worth the trade off. Phew!
Andy
Now I Have The 430... Ride Quality Issue
#21
andynorman 
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- Group: Members
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- Joined: 13-November 09
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Lexus Model:LS400
Posted 30 November 2009 - 07:56 PM
MultiQuote
#23
andynorman
- Member
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- Group: Members
- Posts: 22
- Joined: 13-November 09
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Lexus Model:LS400
Posted 07 December 2009 - 08:25 PM
Ray430, on Dec 2 2009, 10:03 PM, said:
Hi andy , so what pressure are you running now? Was thinking of changing my 17"s for 18"s for the looks but do not want to loose the ride comfort. Do you find it acceptable now?
33psi front and rear (which is the specified pressure for four passengers, under 130mph). It is acceptable - probably better than most cars - but I still miss the smoothness on the motorway than I had with the 400. The handling though is much, much better.