EAS Height Sensor Calibration

Hi Everyone

Just a question which I have not seen asked before (I have searched) is it possible / practical to actually 'calibrate' the actual sensor by setting the car at a specific height as desired and getting the mid range digital level signal for the same height (bear with me a minute on this !!)

Knowing that the factory settings for Standard height were as follows

From Ground to Centre of wheelarch 790mm....+/-..7mm AND the required range for the sofware to be within the following for the same height
Front Reading between 95 - 150 rear to be between 85 - 130
So we could then say the 'Perfect' situation would be the height to be 793.5mm and the prefect reading of the front sensors 132 and rear 107 on the RS software readings !

Not if the car was set at the 'perfect height for standard 793 (we won't argue about the .5 mm ) then could the arm be removed from the sensor splines (assuming its on splines that it) then rotate the sensor potentiometer till the desired readings of 132 F and 107 R were read on the software before replacing the arm onto the potentiometer splines


(this is the instrument engineer coming out in me )

Any thoughts or comments

pmallinson said:

Hi Everyone

Just a question which I have not seen asked before (I have searched) is it possible / practical to actually 'calibrate' the actual sensor by setting the car at a specific height as desired and getting the mid range digital level signal for the same height (bear with me a minute on this !!)

Knowing that the factory settings for [FONT=&quot]Standard height were as follows

From Ground to Centre of wheelarch 790mm....+/-..7mm AND the required range for the sofware to be within the following for the same height
Front Reading between 95 - 150 rear to be between 85 - 130
So we could then say the 'Perfect' situation would be the height to be 793.5mm and the prefect reading of the front sensors 132 and rear 107 on the RS software readings !

Not if the car was set at the 'perfect height for standard 793 (we won't argue about the .5 mm [/FONT][FONT=&quot][/FONT][FONT=&quot]) then could the arm be removed from the sensor splines (assuming its on splines that it) then rotate the sensor potentiometer till the desired readings of 132 F and 107 R were read on the software before replacing the arm onto the potentiometer splines [/FONT]
[FONT=&quot]
[/FONT]
[FONT=&quot](this is the instrument engineer coming out in me [/FONT][FONT=&quot][/FONT][FONT=&quot])

Any thoughts or comments[/FONT]
[FONT=&quot]
[/FONT]

Click to expand...

Could the same effect be achieved by having elongated mounting holes?

I'll admit that my first thought was - why ?
Why are you trying to do something mechanically when it can be done electronically ?

Anyway, theoretically yes you could do this.
Practically I wouldn't know as I've never stripped a sensor.

Are you aware of the 'official' method of setting the suspension, using height blocks ?
You seem to be half way between this and the set-it-and-see method that those of us who only have the software would use.

Seems entirely pointless to me, if the sensors are good then they should be within the normal range at any set height.

Do the sensors need to be Recalibrated every so often?

dogsbody said:

I'll admit that my first thought was - why ?
Why are you trying to do something mechanically when it can be done electronically ?

Click to expand...

It would mean that when set correctly the electronic sensor readings would all be equal and not differing slightly at each corner which they invariably are !

I agree it would not improve the actual operation of the EAS but would certianly 'look better' when the readings were downloaded and they matched each other and the car cas at the right "optimum' height

Does anyone know if the sensors are splined ?

They are also not precision devices....you would spend time chasing your tail trying to get them all perfect!

pmallinson said:

It would mean that when set correctly the electronic sensor readings would all be equal and not differing slightly at each corner which they invariably are !

I agree it would not improve the actual operation of the EAS but would certianly 'look better' when the readings were downloaded and they matched each other and the car cas at the right "optimum' height

Does anyone know if the sensors are splined ?

Click to expand...

You will never get the same readings from each sensor, they are not precision devices and each time the car levels it may vary by a few mm.
If you match them at one height, they will be out again at a different height.
Image over substance.

Spec is within 2 bits side to side. The axles MUST be on the same plane, in other words on completely flat ground with the tyres inflated to the same pressure side to side. Back to front doesn't matter. Under those conditions it would be possible to get reasonably within the spec by wriggling mounts or tweaking connection arms. Getting them all exactly the same maybe possible but would be seriously anal to attempt that in my view.

wammers said:

Spec is within 2 bits side to side. The axles MUST be on the same plane, in other words on completely flat ground with the tyres inflated to the same pressure side to side. Back to front doesn't matter. Under those conditions it would be possible to get reasonably within the spec by wriggling mounts or tweaking connection arms. Getting them all exactly the same maybe possible but would be seriously anal to attempt that in my view.

Click to expand...

+1 and 2 bits may be the spec with new sensors but unlikely with used ones.

Datatek said:

+1 and 2 bits may be the spec with new sensors but unlikely with used ones.

Click to expand...

Bet there were not a lot that came out of the factory within 2 bits if truth be known.