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Hi all. I may have touched on this previously but my memory has gone off somewhere. I have a t30 5.1 kombi which sways all over the road (Not worryingly, just soft) but comfortable. I have removed my rear seats and put a R&R bed in along with a 12mm ply floor in.

What should my tyre pressures be 18" wheels if that matters

my ride height is high would just changing to sport-line springs help & lower the van?
 

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A few psi below max but it depends on weight of van when running. Answer to second question is yes. ( and will help with the wallowing. ).
 

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Speak to the guys at Vanworx who did ours or Merseyspeed – T5/T6 Specialists. Both respectable and knowledgable. Ours is dropped 40mm on H and R springs and had drop links changed also. The fitters will tell you what you need based on the van you have and it’s useage. Any further dropped and it was recommended to change to new shocks on a 90k van. You’ll need to inform your insurers also as it’s a modification.
 

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my ride height is high would just changing to sport-line springs help & lower the van?
I had the Sportline springs and I wouldn't recommend those specific ones. Very hard ride and only dropped the back of my van 15mm.

H&R seen widely recommended, or Bilstein B14 if you want to be able to adjust the height and set it perfectly, at a cost.

Lowering will make a big difference to the handling and feel of stability.
 

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I've been driving vans for 18 years and was shocked by the poor quality of my T5.1 2015's suspension.

As standard the springs are so soft and the shock absorbers are so under damped on compression and rebound that speeds of over 60 mph in moderate gusting crosswinds are a bit of a white knuckle affair especially if the road undulates side to side too.

I had H&R -40mm springs fitted and the handling improved significantly although it's still not perfect and I think I really need to replace the shocks to get the suspension working as it should. Also the H&R springs (for a T28) make a clicking/light knocking noise over some bumps which is annoying so I wouldn't recommend them for this reason.

I've played around with tyre pressure from about 30 psi to 50 psi, and found the higher pressures helped my handling woes.
 
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