4.8is Ride Height Calibration

[Neil48is]

Used the search function but i can't find any definitive answers. I've just had two new Arnott bags fitted to the front end and have a friend with the GT1 system. Does anybody know the correct procedure for the ride height calibration, correct values etc ??

[xsx450]

Not to bring up an ancient thread but I have searched for hours now and cannot find the proper ride heights (ground to fender). I am suspicious mine is sitting low but i have no codes. Just a harsh ride...

thanks

[sockethead]

Here you go... but the mesurment is from the bottom lip of the rim to the bottom of the fender...

_______________ 17"____18"____19"____20"___these are wheel sizes
front axle_______685____697____710____722
rear axle________687____699____712____724
sport fr_________670____682____695____707
sport rr_________672____684____697____709

[TerminatorX5]

i was just about to dig up the old post with this info... thanks Rob...

[sockethead]

Originally Posted by TerminatorX5

i was just about to dig up the old post with this info... thanks Rob...

Haha, Last time you posted that, I copied it into a text doc. for easy access

[Ricky Bobby]

Hey guys I thought I would post up since I went out to measure my car today, and I think I need to get my ride height calibrated correctly, I always suspected that my car "looked higher" than it should with Sports Package (so I have sports suspension) and I also have EHCII dual axle air suspension like the 4.8is on my 3.0i.

I measured from the bottom edge of my Style 168 wheels to the bottom of the fender arch, and measured just under 29.5 inches (749 mm!), and about the same on the rear as well. Although I have dual axle suspension I assume I should be using values of 707 front and 709 rear, I can't believe its possible that last time my height was calibrated it was 40mm off!

Is the ride height value 707mm / 709mm ONLY for 4.8is? Or does it apply to all models with 20" wheels and EHCII (the rarely equipped 3.0's and 4.4's)? I'm just wondering if I should lower to 722 and 724 (non-sport values), as that is already an inch of lowering from where I am now.

[sockethead]

When I calibrated my suspension, DIS told me that the sport suspension wasn't detected. I don't know why.
You can still make it calibrate to where you want it by doing the math and putting those values in the calibration routine...

[tmv]

Ricky_Bobby, you have 20" wheels and 2-axles air suspension. I'd go with 707F/709R.
Personally, I would lower it another inch from that value.

[Ricky Bobby]

Originally Posted by tmv

Ricky_Bobby, you have 20" wheels and 2-axles air suspension. I'd go with 707F/709R.
Personally, I would lower it another inch from that value.

Thanks guys, obviously I will make sure tires are at proper pressure when I do the calibration next week, they should not be off by more than 1 psi or 2 at most currently as they were checked a week ago. I have Toyo tires but same sizes as stock, so no worries there. Regardless, 1 or 2 psi would not change my ride height by 40+ mm!

Obviously the last calibration that was done was way off, like I said if my "normal values" should be a height of 707/709 mm then I am approx. 42mm (1.6 inches) off! I will set it to default values first and see how it looks/rides, I may lower another half inch to make it an even 2 inches down from where I am currently at.


I have been looking at my car for the past year going "gosh it really looks high considering I have the sport suspension", I assumed it was right because before I got the car the PO got the suspension calibrated and module replaced, obviously it wasn't done at BMW. I used to put my car in the "access" position and say to myself that's what stock 4.8is ride height looks like! Haha.


Will update next week after playing around with DIS on the GT1 thanks to Neil (neilrmp) who is local to me. TwinsPoppa posted about a function in service functions about "setting the zero point" so I am going to try that function, before trying to do the calibration and "trick the air ride" by putting in positive values to lower, and negative values to raise, etc)

[bcredliner]

That must assume the OEM tires are on the X and inflated to recommended pressure.