Thread: Height limits on EAS using Faultmate

I should add, once i'm finished levelling it (as the rear sits lower in std height) and come up with some good safe numbers, i'll document the details that I have with measurements and upper/lower limits on all heights on the faultmate and post it up here so anyone else looking to do this with the faultmate has something to go off...

Cheers
Keithy

Ahhh! the dreaded calibration. There's a heap of info on this here and in www.rangerovers.net/forums

Essentially the 'numbers' are socalled bit counts for the ECU. The bit counts are calculated by the ECU from the voltages across the potentiometers and relate to the angular displacement of the sensor arm which is determined by the height of the vehicle. BTW ...the relationship between bit counts and voltage (0-5v) is not linear

The LR EAS Systems Engineering Document states that when the distance from the bottom of the bump stop stub to the axle plate on the front axle is 100mm both sides and the same measurement on the rear axle is 105mm for both sides then the vehicle is at "Standard Height". All other measurements are then taken from this reference height.

So, to get the correct height settings you need to cut some calibration blocks from hardwood (2" square" is ideal) exactly 100mm long (x2) and 105mm long (x2). Remove the bump stop cushions and and place the blocks between the respective bump stop stub and axle pad and CAREFULLY lower the body so it is resting fully on the blocks. Record the "actual" bit numbers from the Faultmate

If you are so inclined, cut additional blocks in several lengths to represent the different height settings, and once you have the vehicle settled at each height using the blocks, record the "actual" values from your Faultmate. These become the target reference numbers.

Mudguard mid-point to wheel centre measurements etc are only proxies for the correct bump stop to axle distances. They do not take account of chassis warp, irregularities in panel fit, over/under size tyres etc.

If you want to use these other measurements for convenience, record them when the blocks are in place so that you can make allowances later on.

Cheers

The bump stop measurement is from the tip of the bumpstop ie the contact point of the stop onto the diff, not to the mounting point of the bump stop.

You need to account for the height of the bumpstop also.

Andrew


I am not a moderator, I am a human being!!!

Cheers guys!

I have already searched RR.net, in fact, I have searched google, landyzone, lrr forums, even blackbox forum to no avail! I was aware of the standard height and calibration blocks also. The main reason behind my thread is that nobody has any data on the net as far as I have found that details the bit-number upper/lower limits that faultmate will allow you to plug in without creating an EAS fault for "height data is not valid".

I wouldn't imagine that tyres would have any difference at all on the centre to mudguard readings though - only if I was measuring from the ground! I would then have to make sure the tyres were all at the same pressure!

I have found the upper limit in the high setting and standard (while attempting to simply level the car), and have about 5 pages of hand-written data so far to somehow make sense of! I don't believe i'll go for the magic "152 bit" as my target setting on High profile as the airbag appears to be at full extension and this will definitly be unsafe off-road.

I've saved the settings every time I made a change on even one of the height sensors, so I can revert back to the settings that were with the car when I purchased it! Very handy!

Now all i'm left to do is go through and find the remaining limits and write them down! I still find it funny that not a single "bit-number" for my RR is the same (the variance between them is quite high simply to make the car level)!!

Cheers
Keithy

Originally Posted by LOVEMYRANGIE

The bump stop measurement is from the tip of the bumpstop ie the contact point of the stop onto the diff, not to the mounting point of the bump stop.

You need to account for the height of the bumpstop also.

Andrew


I am not a moderator, I am a human being!!!

Yep the "tip" ...which is the "bottom" unless it's a case of "bottom's up" which it's not because its tip, which is at the bottom because it's hanging down. Its mounting point is at the top but it's the base not its bottom It's also an exercise in the correct use of the apostrophe with regard to correct use of its (possessive) and it's (for "it is" )

sometimes I can't help myself...

Originally Posted by Hoges

Yep the "tip" ...which is the "bottom" unless it's a case of "bottom's up" which it's not because its tip, which is at the bottom because it's hanging down. Its mounting point is at the top but it's the base not its bottom It's also an exercise in the correct use of the apostrophe with regard to correct use of its (possessive) and it's (for "it is" )

sometimes I can't help myself...

Hoges - sounds like you are channeling the "inner-Ron"...

Yep...it's an " age" thing

Originally Posted by Keithy P38

Cheers guys!

I have already searched RR.net, in fact, I have searched google, landyzone, lrr forums, even blackbox forum to no avail! I was aware of the standard height and calibration blocks also. The main reason behind my thread is that nobody has any data on the net as far as I have found that details the bit-number upper/lower limits that faultmate will allow you to plug in without creating an EAS fault for "height data is not valid".

I wouldn't imagine that tyres would have any difference at all on the centre to mudguard readings though - only if I was measuring from the ground! I would then have to make sure the tyres were all at the same pressure!

I have found the upper limit in the high setting and standard (while attempting to simply level the car), and have about 5 pages of hand-written data so far to somehow make sense of! I don't believe i'll go for the magic "152 bit" as my target setting on High profile as the airbag appears to be at full extension and this will definitly be unsafe off-road.

I've saved the settings every time I made a change on even one of the height sensors, so I can revert back to the settings that were with the car when I purchased it! Very handy!

Now all i'm left to do is go through and find the remaining limits and write them down! I still find it funny that not a single "bit-number" for my RR is the same (the variance between them is quite high simply to make the car level)!!

Cheers
Keithy

"Bit" count ranges for various settings from the LR Tech Data
Profile ............................. Front............................Rear
Extended .......................120-180 ...........................105-150
Standard ........................95-150 ............................85-130
Highway..........................75-140.............................75-120
Access ..........................50-110..............................50-100


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Scroll down to post by Storey Wilson : "Re: EAS calibrating driving me nuts"

very full explanation

hope it helps

cheers


PS have you done the LH<->RH sensor swap to get the benefit of the "new" surface ...i.e. that part of the potentiometer which is not used during normal operation...so by swapping sides you effectively get a new "pot" because the tracks are not worn...