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  #161  
Old 12-13-2018, 12:15 PM
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Yes it will go lower but remember, when you reach a certain sped, I canít remember the mph exactly, it will go back to the normal ride height
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  #162  
Old 12-30-2018, 01:18 PM
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I think I've heard the speed is 25mph. Recently a new car to me was calibrated with INPA and I drove out my neighborhood to test only to have the car bottom out after I reached 25, locking a front wheel and blowing the front right CV clean apart. I was surprised that even if there's a ride height sensor problem the car would be able to bottom out like that. At this point I suspect the PO/Dealer did strut work and did not replace the bump stops. Check for these and be careful!
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  #163  
Old 12-31-2018, 01:07 PM
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Quote:
Originally Posted by jayarc View Post
I think I've heard the speed is 25mph. Recently a new car to me was calibrated with INPA and I drove out my neighborhood to test only to have the car bottom out after I reached 25, locking a front wheel and blowing the front right CV clean apart. I was surprised that even if there's a ride height sensor problem the car would be able to bottom out like that. At this point I suspect the PO/Dealer did strut work and did not replace the bump stops. Check for these and be careful!
This is the first I hear of this on the forum. Iíve had air out of my springs and I am 100% sure I could drive the car around. Iíve also heard of quite a few bag failures and the car just becomes ultra bumpy and bouncy, but still drives no problem.

So I have to agree. Someone did some stupid shit to your car and failed at putting it back together. I replaced my bags with complete Arnott units with the shock, so not sure where the bump stop it.
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  #164  
Old 12-31-2018, 01:14 PM
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There were other things found that a PPI wouldn't reveal that make me cringe as well. So the only time I've actually seen a front bump stop on an air suspension was doing research. This video you can see the orange rubber bumpstop:


https://youtu.be/gbd_EUJojyQ?t=9


On other cars these prevent bottoming out. I don't have my new parts yet for the CV/stops but I'll post pictures of what I find when I do.
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  #165  
Old 09-01-2019, 11:12 PM
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Labor Day Resurrection:


I came across the ride height debate in another thread: https://xoutpost.com/bmw-sav-forums/...sing-inpa.html . Being the second owner of the 4.8is I have, the thread I linked poked my interest and after looking at my truck parked on level ground, the ride height appears to be off. Further investigation with a tape measure and finding this current thread via a search in Google, has proven to me that my eyes are not lying. The front end looks like it's got a slight lift kit.



However, I have followed everyone's advice on measuring and data input but get an error message when inputting my newly calculated values into INPA. What's more is that the software is reading "current" measurements that are way off the OEM specs that are provided within INPA on the calibration page. As we all know for the 4.8is sport suspension (in mm) the:
front axle = 707
rear axle = 709



INPA is reading my truck at:
LF = 596 RF = 455
LR = 432 RR = 515


However, these measurements don't make sense because my personally measured numbers are:
LF = 717 RF = 725
LR = 703 RR = 709


Following the INPA V.5.0.6 work flow I select:
e53>chassis>two-axle air suspension>F6>F5
which brings up the electronically measured numbers above and displays the OEM ride heights where they need to be all on the same page. I then select calibrate, which brings up a small window instructing me to subtract the current measurement from the OEM recommendation. My assumption is that I take the electronically measured number (current) say LF = 596 - 704 = -108. I then put -108 into the field, click ok. I get an error message stating the value is invalid.


Am I to use my physical measurement with the tape measure (as my current) minus the required (OEM) and input this into the fields and ignore the electronically measured numbers? Before doing that, let's back up a step: how I am to baseline the suspension to factory?


The final goal is to drop the entire truck around 25 mm, maybe 30 mm in the front.
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Last edited by X5M-ISH; 09-02-2019 at 11:00 AM.
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  #166  
Old 09-02-2019, 02:56 AM
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Hi mate...

Firstly I'm better with ISTA on this than INPA, but when I was playing around with it I made a similar mistake. I didn't read the explanation CLOSELY and got incorrect errors.

The software needs to generate offset values as all cars and components are different, or put another way, because it's measuring voltages in the ride height sensors it needs to know which voltage measurement is the correct one so it can raise or lower to the right point.

It then applies an offset value to get it there.

Read the calculation sentence again and follow it precisely. From memory it is the other way around to your calcs..... actual height (your measurements) minus the nominal height (INPA)
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  #167  
Old 09-02-2019, 03:02 PM
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That did it. I was able to zero all four corners, then dropped the entire truck 30 mm. This process took about five minutes. To summarize the work flow for future lurkers:


For using INPA v.5.0.6 and SPORT SUSPENSION:


*Park on a flat surface
*Check inflation levels for all four tires: doesn't matter what they are so as long as they are the same
*Measure from the absolute bottom of the rim to bottom of fender molding: lining up your measuring device along the center of the roundel and note the length. Measure as vertical as possible.
*Make sure you properly measure: If you tend to read the left side of your tape measure this is fine for one side of the truck, but the opposite side must read from the right side of your tape measure else your measurements are off by up to 3/16".
*Convert everything to mm and round to the nearest significant figure: If you have 709.5, then it is now 710. If you have 709.4, then it is 709. Rounding a tenth of a mm is just fine for spatial resolution.
*Subtract your measured numbers from the OEM numbers. If you have a negative value, you must put a minus sign into INPA later on.
*Interface computer to truck
*Start engine
*Close all doors
*Select "e53"
*Select "Chassis"
*Select "two-axle suspension"
*Press "F6"
*Press "F5"
%Input calculated numbers for Rear Right and Rear Left
*Click "OK"
%Input calculated numbers for Front Right and Front Left
*Click "OK"
*INPA will indicate the system is calibrating at the bottom left of your INPA window
*Once completed manually raise and lower your truck via the button near the steering wheel
*Measure all four wheels again to verify
*Repeat all steps as necessary

%To lower your truck, you simply input your desired drop in mm during the data entry phase of this process. I did a 30 mm drop so I input "30" in all four fields. If I desire to change this back to stock ride height I will then put "-30" in all four fields. The numerical input is inverse of the output.


...now if only I can figure out how to entry-access lower the truck when the key fob unlocks the doors!
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Last edited by X5M-ISH; 09-02-2019 at 03:15 PM.
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