4.8is Ride Height Calibration - Page 13

brucemillar · #**121** 01-04-2018, 05:07 PM

Watching this as I have almost the same issue. I tried to correct it with INPA but it does no know the default or zero point to calibrate from. My sensor readings are all over the place regardless of how the actual car is sitting.

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e39_touring · #**122** 01-04-2018, 05:19 PM

See my response to Bruce's other thread here:

https://xoutpost.com/1125699-post4.html

It's been a while since I've used DIS, but keep in mind that in INPA, you're almost always dealing with "raw" sensor values. i.e. IIRC, the ride height sensor values you see in INPA aren't converted to any particular ride height measurement. DIS may perform that conversion for you to make it easier for the dealer tech to use, but INPA works at a lower level than that.

You really don't need to care what the sensor values in INPA show. You only care that your ride height is correct. You enter the difference between your current measured ride height and desired ride height, and use that number to calibrate in INPA. You'll end up with new, equally meaningless, sensor readings in INPA, but if you've done everything correctly, your ride height will now be where you want it.

svvg · #**123** 01-04-2018, 07:19 PM

Thanks for the above. From this thread and similar ones - I think that in INPA you enter the difference from where each corner sits vs the preprogrammed ride height for that car (for the sport suspension models this seems to be the figures set out above - being 707/709. If you want a non-standard ride height eg to lower the car, then you inflate the measurement so the car performs a larger calculation and drops/raises the car more than necessary) and INPA will then move the car by the amount typed in.

Whereas... In DIS, you enter the full height measured on each corner, and
DIS does the maths (based on the pre-programmed values mentioned above) and adjusts the ride-height accordingly?

My car is not massively off from the look of it - but it’s difficult to find somewhere level... maybe a petrol station forecourt - or shopping centre car park! I’ll have a play and report back...

Thanks again.

X5monsterBMW · #**124** 01-05-2018, 07:28 AM

Hi - I did have similar issues a few years back... as far as I remember I raised & lowered the car via a diagnostic machine (my pal local garage)... I measured correct height (bottom wheel rim to wheel arch to get correct height) ... the readings from sensors come in at all different values - this does not matter - you then tell the diagnostic it is level & module remember those figures. If one corner sags more than 9 to 11mm after that, SLS inactive will come up on dash......
However I could not get the system to re-activate even after clearing codes.
I went to local independent BMW guy who had more sophisticated S/W.
He had SW prog that takes you step by step through the process.
It is weird - you cant stop mid program or it messes up.... he showed me it step by step till it completes - again involves raising & lowering to correct (tape measure) height... then locking off etc etc... we had 2 big guys sitting in the boot/trunk so that when it pumped up we were sure it was correct & stable. Then locked off (saved) various voltage values as 'level' The guy charged me £40 as it was quite a quick process... 20mins ish. Hope this helps. Malc

brucemillar · #**125** 01-05-2018, 07:37 AM

Thank you for this. It does help. I think you are correct in that there is a process that needs to be followed step by step to get it 100%. I was rather hoping that somebody have this for INPA?

Does anybody know what generates "Error 116"? I know what it it means, but want to know where it is coming from.

There is a big risk here of me going out and buying a new compressor only to have the same error. This would not be funny. My wife is already not amused as it is. he sight of me heading off up into the garage at night, with a laptop, has got her thinking stuff she should not be thinking.

X5monsterBMW · #**126** 01-05-2018, 10:07 AM

Hi again - ha ha - yeah you could be caught watching BMW porn!

OK Code 116
I am no expert but have had this too!
In fact I have historically had every code under the sun on the 4.8is suspension... I kind of understand it now... firstly with that code check for airbag leaks.. washing up liquid & water in plant sprayer...
If OK it is probably weak compressor... rebuild it with a new seal kit (bagpipingandy's kit on Ebay) ... search e-bay on item 151136257007 - about £25 when I did mine... will take you 30mins
My kit worked for over a year but then had same problem again because of scored cylinder head on compressor - he also has a kit for that... 1 hour fix & code has never re-appeared He even has a vid on you tube shows you how to do it all.
You will get there in the end.... honest! LOL
Best
Malc

svvg · #**127** 01-05-2018, 12:17 PM

Have saved those ebay items - thanks!!!

we350z · #**128** 01-05-2018, 05:21 PM

I am about to give up on INPA installed DIS last night on my Surface hoping that will work.

This sucks.

sockethead · #**129** 01-05-2018, 06:20 PM

I always used DIS on our 4.8is to calibrate the suspension. There is a whole diagnostic/calibration routine that tells you exactly what to do and when. I found it very easy to use. Just make sure you use the proper measurements mm/cm. I messed that up once and it maxed out the suspension... Looked goofy as hell all jacked up.