P38A EAS with nanocom

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Baileyroverq

Baileyroverq

Active Member
Posts
167
Location
Woodley Berks
hi all I know that we take measurements from centre of wheel to centre lip of wheel arch and let's say it is 428mm but what does nanocom measure it in and how does that correspond with the heights of measured values any help is appreciated as I am very confused by this and need to calibrate after new sensor fitted I have heard the term bits but what is the size of a bit I don't see it anywhere on nanocoms information so as I say any help greatly appreciated
 
A bit isn't a 'size' or a 'measurement' it is a data reading from the sensor.

The calibration process without the height blocks is a matter of iteration.

Measure......Read 'bit' values.....change the 'bit' value by 2 or 3 points.......write to ECU......Re-measure the physical height......change the 'bit' values again.......repeat until you get the physical heights all round to be somewhere close.

Remember if you change one corner, the other corners will also change, so don't expect it to be a quick process!
 
MUST be on flat ground TPs all good and do not get in the car to change settings then get out to measure. Do it all from outside car. All measurements are plus or minus 7 mm. But get front as level as possible.
 
The reason they are referred to as bits is because it is an analogue value which is converted into a digital value. Depending on whether it an 8 bit/16 bit/32 bit conversion will show a different number.
So, for a 16 bit number, the minimum input (I. E. 0volts) would be zero and at maximum height it would be 65536 if it's an unsigned integer.
Not sure how many bits the height sensors are written to but that's the basic principle.
Therefore, if the travel were 100mm,and it was a 16bit unsigned, a change of 65 would represent 1mm

If I get chance, I'll have a look what it's scaled to and update this to real numbers.
 
Wazzajnr said:
The reason they are referred to as bits is because it is an analogue value which is converted into a digital value. Depending on whether it an 8 bit/16 bit/32 bit conversion will show a different number.
So, for a 16 bit number, the minimum input (I. E. 0volts) would be zero and at maximum height it would be 65536 if it's an unsigned integer.
Not sure how many bits the height sensors are written to but that's the basic principle.
Therefore, if the travel were 100mm,and it was a 16bit unsigned, a change of 65 would represent 1mm

If I get chance, I'll have a look what it's scaled to and update this to real numbers.
Click to expand...

When i refer to "Bits" in the case of EAS adjustment it just means steps between two numbers. Each setting can be adjusted within a low and high number of bits or stages. With a lower and upper number that CANNOT be exceeded in either direction. See below. Nothing over or below the lower or upper values can be input for the selected height or the system will default to preset and you will have to start again. It is best to stay within 5 bits of upper and lower values. For instance. Standard Front, don't go below 100 or above 145.

.................... Front..................... Rear
Extended 120-180................ 105-150
Standard.. 95-150.................. 85-130
Low.......... 75-140.................. 75-120
Access..... 50-110...................50-100

Note all the present values BEFORE YOU START then you have reference to return to. Ideally the bit count side to side should be within 2. Measurement plus or minus 7 mm.
 
Last edited:
RubyRR said:
The proper kit is a set of rods of certain lengths which sit up in the middle of the bump stops and the vehicle is lowered down on to them to give the required heights.

Here's one by the looks of it:
http://www.island-4x4.co.uk/suspension-calibration-blocks-range-rover-lrt60003-p-27763.html

or you can make up your own like them there:
http://www.mez.co.uk/p38-eas.html
Click to expand...

Sizes for calibration blocks for all heights are listed in my EAS "How to" in tech archive. The standard calibration blocks are for use with T4. There are only two sizes in the kit. Access and Standard. So if you use those you will still have to measure the other two settings.
 
Last edited:
I've got some blocks here. Think the measurements were on RR.net.

Pop the blocks in, lower car onto blocks, photograph Nano readings, program readings into EAS. Repeat for each height. Takes about 30 mins because you have to wait for the compressor to catch up by the last lot.
 
is it best to do it by jacking the car up and putting blocks in or to use the air itself because I put the high blocks in lowered the car to blocks and it kept rising back up at the back so I couldn't get a good reading on the back is that right ?
 
Baileyroverq said:
is it best to do it by jacking the car up and putting blocks in or to use the air itself because I put the high blocks in lowered the car to blocks and it kept rising back up at the back so I couldn't get a good reading on the back is that right ?
Click to expand...

Lift to high, fit blocks then drop it onto the blocks by selecting access. Then open a door and go to standard height page on Nanocom take the readings sat on the blocks at standard height. Record them then write them into the ECU at standard setting. Lift to extended remove blocks and see where it settles when standard is selected.
 
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