Need definitive answer on tight tolerance mode

[trif]

Like many others l am looking at ditching the Wrangler HPs and changing to Pirelli Scorpions as soon as my new D4 HSE arrives. I mentioned this today at the Newcastle dealership and was promptly told about the need for tight tolerance mode.

The tyre dealership they use is just around the corner, and knowing the owner and staff from servicing my current vehicle, l promptly asked them the same question. They were adamant about the need for TTM after having other D4 owners suffer uneven wear damage to their tyres and needing to cover costs.

I know the FAQ states "Normal height mode" should be sufficient, but l would love to know for sure. Are they just spouting LRA rhetoric ? Thanks in advance.

[Graeme]

After waiting far long to see if I could get to the dealer's to have TTM set for an alignment (the 2 left tyres were scrubbed-out), I had it done locally without TTM set but at a specialist workshop and with the main suspension fuse pulled once the vehicle had levelled on the platform and was without any occupants so that it couldn't re-level downwards mid-session. Whilst the geometry was within LR specs, left and right front cambers were at opposite ends of the specs and rear toe was a long way from the optimum setting. As the tyres were effectively worn-out and I have just fitted new tyres, I cannot yet say whether the alignment was succesful or not. However soon after the alignment was done I realised that the vehicle now steered consistently around bends where it felt awkward beforehand, so I recommend not waiting for TTM if waiting is going to destroy tyres.

[101RRS]

Hmmmmmm - please explain :( - what is Tight Tolerance Mode??? Is this just a D4 thing or does it also apply to D3 etc

Garry

[Graeme]

In TT mode the suspension ecu allows less leeway between the target height and the actual height for each wheel, ie its more fussy about getting to the correct heights.

[101RRS]

In TT mode the suspension ecu allows less leeway between the target height and the actual height for each wheel, ie its more fussy about getting to the correct heights.

For what purpose??? Wheel alignment

[trif]

Thanks Graeme for your answers so far.

Garry, yes, it refers to wheel alignment.

[gghaggis]

As Graeme mentioned, if you don't have the facility to engage TT mode, the key is to let the car level itself on a flat surface (stationary with the engine running for around 10 min should do it), and the switch off and pull the fuses for the EAS. You can use this method to do the alignment at any height - ie if for some reason you need to run the car constantly at off road height, you can set it at off road and follow this procedure to set the alignment for this height. Of course then it will be out for on road height. This applies to all EAS cars,
Cheers,

Gordon

[roamer]

I put Pirelli ATRs on 25,000 km ago and had wheel align done ,in on road height at Bob Jane. Tyres are wearing even, no problems ,maybe just lucky.


Cheers Ken

[101RRS]

the key is to let the car level itself on a flat surface (stationary with the engine running for around 10 min should do it), and the switch off and pull the fuses for the EAS.

Gordon

Another example of making things more difficult than it needs to be.

[~Rich~]

For all interested where is the fuse found and is it labeled?

[stig0000]

its there for a reasion so why not just take the time to do it,, then if the tyres do ware out to fast take it back to who did the WA:),,

im sure if you give a dealership a days notice jsut to put it in TT they will be more then happy,

[101RRS]

im sure if you give a dealership a days notice jsut to put it in TT they will be more then happy,

If it has to go onto a computer, my stealer will charge a minimum of $150 for that privilege.

Garry

[trif]

As Garry points out the dealers tend to charge what l think is a large sum for a very quick procedure. In Newcastle l believe in the order of $120 for the priviledge of TTM. That is the reason l asked the question to start with.

Gordon, thanks for your input as well. If it works that is definitely a cheaper option.

Given that l'm a curious sort, and since l know the tyre dealership owner pretty well, l was thinking of aligning the car in "Normal suspension mode", then getting it put in TTM and see if it makes any difference. Has anyone done this before? It might be a way to sort out this question for good.

[stig0000]

If it has to go onto a computer, my stealer will charge a minimum of $150 for that privilege.

Garry
150!!!! your kidding,, i no they can be bandits on price but that seems abit :o:o

i wouldent say its very qwick,, this is SDD were talking about:wasntme::D

[Graeme]

l was thinking of aligning the car in "Normal suspension mode", then getting it put in TTM and see if it makes any difference.
Not for a wheel alignment, but seeing as I can now set it, I set TTM whilst the vehicle was on a slightly uneven surface. With the engine running, normal height was set and the vehicle sat quietly, but set TTM and the suspension was constantly adjusting, presumeably trying to get all wheel heights at their target heights which was impossible due to the uneven surface. I could not detect if and by how much the geometry was changing. BTW, TTM works in off-road mode too.

[gghaggis]

Another example of making things more difficult than it needs to be.

Not really - it's a consequence of having such a versatile and adjustable air suspension system. I can't really think of a way they could have designed around this without compromising the system in some way.

Other than fitting coils ...............

Cheers,

Gordon

[101RRS]

Not really - it's a consequence of having such a versatile and adjustable air suspension system. I can't really think of a way they could have designed around this without compromising the system in some way.

Other than fitting coils ...............

Cheers,

Gordon

Or having a TTM setting built into the car systems that the owner can select when required.

[gghaggis]

Or having a TTM setting built into the car systems that the owner can select when required.

Sorry, I thought you were referring to the system being overly complex. As for implementing it, well you can - buy a Faultmate -added expense, I know. Of course for free, you can just pull the fuses :)

Some of my clients always use an independent (car out of warranty) and use this method all the time. Haven't heard of any ill-effects yet.

Cheers,

Gordon