D4 suspension

My 2011 D4 came with Continental Tyres and the ride was quite plush to me. I replaced those tyres at 32000k and fitted Zeon LTZ's. I run the Zeon's at the door plate pressure or thereabouts and have now done a total of 65000k.

In fact on checking I have 32F and 36R pressure in the tyres at the moment.

The ride is as good as it was with the Continentals but there is a little more road noise due to the tread pattern. I rotate the tyres (5 way rotation) each 10000k and so far the wear is even all around. Looks like they will go close to double the wear of the Continentals.:D

I have not noticed any appreciable variation in the ride quality and as above the vehicle has done 65000k. Equally I don't think the shockies are on the way out (as far as I can tell).

Sometimes when I read these threads I begin to wonder if I am missing something when I check out my vehicle???

Maybe I have a screw loose:p

Hi,

I've found tyre pressure makes a big difference to ride quality but you have to be careful when you change brands/types.

I switched my OEM Wranglers over to Scorpion ATRs and got them at the usual tyre shop 'recommended' rock hard, over 40PSI setting. I found them harsh and a little skittish in the wet (although I've been told increased pressure in the wet actually helps with traction....that may depend on just how much of an increase). I dropped to the placard 33 + 36, with a much improved ride.

Problem with this didn't become apparent for a little while though. I have effectively reduced the life of my Scorpions as they all wore (all 4) on the outside edges quicker than the inside. Which is indicative of pressures being too low.

I had to pick the best of the worst for the back and spare, buy one new one and employ the spare tyre (never used), so that I had two good tyres on the front. I'm now operating just below 40PSI in the front and above in the rear (so that I get some more use of the middle, where the tread is still good).

I'll have to monitor wear much more closely now.

You'd hope manufacturers would be able to supply the correct data...but I guess there are lots of variables...weight of vehicle, usage, power, etc.

I face the same dilemma with the new 18" Zeon LTZs I just bought as I don't know what pressure to run those on the road at....came from tyre place at 42PSI.

Anyway, as other have suggested, play with the pressures until you get a good ride. If the corresponding pressures are at placard or above, it was your tyres. If not (as in the pressure is lower), I'd be taking the car back.

And as I've learned the hard way...watch wear carefully.....it's a bloody expensive mistake on 19" tyres. :mad:

Cheers,

Kev.

The tyre place must have been hedging their bets when they installed my Zeons. According to my tyre pressure gauge, they were at 40FL, 39FR, 36RL, 37RR.

Took them up to 40 all around, and haven't noticed any harshness in ride. Mind you, it felt absolutely plush after test driving the IS300h with run flat tyres; I now remember why we didn't get a 3 series previously.

Quote:

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Originally Posted by pwillo

My D4 is still on the boat, but I have need stalking AULRO & Disco 3 UK for a while.
Plans are to replace the 19" factory rubber on day 2 with Zeons.

Has anyone tried the 4 psi rule on the Zeons to find a good pressure?

Regards

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what is the 4psi rule ??

Quote:

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Originally Posted by landoman

what is the 4psi rule ??

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There's quite a bit of info available on it but have a read of this to get an idea:

Using the 4psi Tyre Inflation Rule @ ExplorOz Blogs

Probably more correctly should be referred to as a guide rather than a rule.

It takes into account the differing loaded state of a tyre and suggests that a tyre at the correct pressure for the load should, when in use, increase by 4 psi.

This of course doesn't take into account ambient temperature and changes barometric pressure.

It does however seem reasonable that generally it would be a useful guide.

Regards