4.8is Ride Height Calibration

[Ricky Bobby]

Originally Posted by bcredliner

I assume you have driven your X since you replaced the tie rods so that the suspension has settled.

I have always had alignments done at the dealer. Once or twice I was not happy and they did a re-check at no charge.

Yes I have driven it around the block a few miles, it rides like hell so I am not driving it much more until it goes to the dealer (they are 4 miles away from my house). I guess I will drop off for alignment and have them note that the front end should be a half inch lower to match the rear, its not like all 4 corners are off, I'm sure that should be within the specs of doing the alignment (making sure each corner is level/proper height)

I just looked at my sensor arms again and they are fine, I think it was caused by me jacking the car up with the wheels turned at an angle, I've never had an issue with jacking it up with the wheels straight. Regardless, I'm finally going to invest in the Romanian software/cable and a dedicated laptop for installing INPA/DIS and NCSExpert, way too sick of not being able to diagnose my issues.

[Ricky Bobby]

OK So I definitely have some issues here, all 4 corners are off and I just had SELF LEVEL SUSP INACT come on yesterday, is this caused by the massive deviation of ride heights between the corners?


Measured from bottom of rim flange to just under fender arch as per factory:

Drivers Rear: 698 mm
Drivers Front: 723 mm
Passengers Rear: 714 mm
Passengers Front: 742 mm


I'm guessing the error thrown is due to the corners being way off (I think there is a tolerance of 10 mm or so), but wanted to hear some opinions. The height stays constant for the most part so I don't think the rear bags are leaking, for whatever reason my heights are just massively off.

Front air struts are new, air compressor was replaced, height sensor arms look ok (although I will check later), I'm hoping its just because of the difference in values corner to corner.

[bcredliner]

Differences in tire inflation will make a difference in your measurements.

[Ricky Bobby]

Tires are all inflated to same measurement

[sockethead]

What is the reason is for the inactive message in DIS?

[Ricky Bobby]

Working on getting that for you socket, my DIS cable is in the mail as we speak on its way to me.

I actually went for a drive last night with the wife again and no error on the dash at startup, and no error during the drive or until I parked back in the garage again, so I don't think I have any major issues here (when my air compressor was dead the SELF LEVEL SUSP INACT never went away until cleared by DIS!), I'm thinking the large deviation in ride heights creates a "soft error" that may pop on and off, but not a level 2 error like the compressor being inactive, where when that error pops up it is more of a system failure and can not be cleared even by DIS unless you fix the problem.

Here are my current measurements again on each corner:

Drivers Rear: 698 mm
Drivers Front: 723 mm
Passengers Rear: 714 mm
Passengers Front: 742 mm

[Big "J"]

Originally Posted by Ricky Bobby

Working on getting that for you socket, my DIS cable is in the mail as we speak on its way to me.

I actually went for a drive last night with the wife again and no error on the dash at startup, and no error during the drive or until I parked back in the garage again, so I don't think I have any major issues here (when my air compressor was dead the SELF LEVEL SUSP INACT never went away until cleared by DIS!), I'm thinking the large deviation in ride heights creates a "soft error" that may pop on and off, but not a level 2 error like the compressor being inactive, where when that error pops up it is more of a system failure and can not be cleared even by DIS unless you fix the problem.

Here are my current measurements again on each corner:

Drivers Rear: 698 mm
Drivers Front: 723 mm
Passengers Rear: 714 mm
Passengers Front: 742 mm

RB, did you ever get this figured out? I'm need to set mine as well using INPA.

Thanks,

Jason

[Ricky Bobby]

Originally Posted by Big "J"

RB, did you ever get this figured out? I'm need to set mine as well using INPA.

Thanks,

Jason

Yeah man! Once I got INPA and GT1 loaded it was easy! I had a few errors from my last calibration and probably the suspension work, I initially tried to recalibrate with INPA but I'll be honest that program doesn't make that much sense to me (probably because I have more experience with DIS / GT1)

So I actually went into DIS (do you have both programs? I assume you do, I bought the Romanian cable with all the programs), cleared any errors from the EHC module, and there is actually a function that will allow you to raise/lower by corner, as well as raise/lower front or rear axle. It's not the entire calibration routine but after you set your corners up, there is another option which says

"Set zero point, default ride height" - front axle, rear axle


So what I did was lower and raise a couple of the corners to get them as even as I could, then I just "set zero point" on front axle and set on rear axle, haven't had a problem with my ride height since. I'm sitting perfectly at stock 4.8is height right now, and actually set a hair lower in the front to make a nice slightly forward rake look. About 28" wheel to fender at all corners though.

PM me if you have any problems Big J! Always ready to help a brotha out!

[Big "J"]

Sweet!
Yes, I have DIS and will get it running tonight. May have to get a Starbucks to stay awake while it loads....Zzzzz!

I tinkered with INPA last night and managed to get my rears to stay even at 28.5" but, the front left is 1/2" lower (27.5") than the right side. I too want a lower stance and will probably set them like TMV did.

Thanks for the tip and will let you know how it rides!

[Ricky Bobby]

Originally Posted by Big "J"

Sweet!
Yes, I have DIS and will get it running tonight. May have to get a Starbucks to stay awake while it loads....Zzzzz!

I tinkered with INPA last night and managed to get my rears to stay even at 28.5" but, the front left is 1/2" lower (27.5") than the right side. I too want a lower stance and will probably set them like TMV did.

Thanks for the tip and will let you know how it rides!

I hear ya, I drove myself crazy too, its never going to be perfect but should be within 1/4" or so from side to side, obviously assuming tires inflated the same and on level ground.

Also it will settle somewhat when driving, but like I said you can lower/raise one corner at a time then "set the zero point" on the axle you are done with, and that should work out nicely for you. it will take some playing around but you'll get it!