[tboooe]

I recently got coils and have been dialing in the ride height. I typically set the height with a 1/2 or 3/4 full tank of gas. Anyway, I've been monitoring how the ride height changes based on the amount of fuel I have and what I noticed is only the left rear height changes, all other wheels stayed the same. Does this seem odd? To me it looks like the gas tank is centered so I would expect the ride height to change for both rear wheels.

[rking117]

sounds to me like maybe your shock/coil over on the right might not have the same volume of compression that the others do. You are correct the vehicle has a good center of gravity with the tank in the middle. I would suspect suspension parts for sure.

[tboooe]

Originally Posted by rking117

sounds to me like maybe your shock/coil over on the right might not have the same volume of compression that the others do. You are correct the vehicle has a good center of gravity with the tank in the middle. I would suspect suspension parts for sure.

Thank you for the reply. Can you please explain your comment more? When I look at the ride height adjustment collar, it looks to be in the same position on both rear sides.

[smithf80]

Originally Posted by tboooe

Thank you for the reply. Can you please explain your comment more? When I look at the ride height adjustment collar, it looks to be in the same position on both rear sides.

I think he's saying its defective.

[tboooe]

Originally Posted by smithf32

I think he's saying its defective.

You suck!

[HighlandPete]

Originally Posted by tboooe

I recently got coils and have been dialing in the ride height. I typically set the height with a 1/2 or 3/4 full tank of gas. Anyway, I've been monitoring how the ride height changes based on the amount of fuel I have and what I noticed is only the right rear height changes, all other wheels stayed the same. Does this seem odd? To me it looks like the gas tank is centered so I would expect the ride height to change for both rear wheels.

Just a thought on the installation... were all the bushed components tightened up at the same/equal working ride height?

If not, it could mean each corner has a different stressed condition. That can cause different heights across an axle at various loadings.

HighlandPete

[tboooe]

Originally Posted by HighlandPete

Just a thought on the installation... were all the bushed components tightened up at the same/equal working ride height?

If not, it could mean each corner has a different stressed condition. That can cause different heights across an axle at various loadings.

HighlandPete

Good point and even better question. I have no idea since I got the coils installed at a shop. Since my car was on a lift, I assume all the components were tightened with the suspension in a uncompressed state. Wouldn't that have the same effect as tightening everything with the car at the same ride height?

[G30 B58]

When doing suspension work, make sure the suspension is pre-loaded when tourquing down all the fasteners.

In other words, make sure the vehicle is on the ground and not hanging from a lift when fastening / torquing suspension components.

Someone else did the install?

[tboooe]

OK I did a quick inspection of the rear suspension and based on a visual it looks like the left spring is at a slight angle while the right spring appears to be pretty close to vertical. Based on this, maybe one of the springs is not seated properly. I will remove the rear tire and check it out.

[tboooe]

Originally Posted by F32 N55

When doing suspension work, make sure the suspension is pre-loaded when tourquing down all the fasteners.

In other words, make sure the vehicle is on the ground and not hanging from a lift when fastening / torquing suspension components.

Someone else did the install?

Yeah I has EAS do it. They seem to work on a ton of BMWs so I assumed they knew what they were doing.

The problem is, how do I get to the various components to tighten if the car is on the ground? I guess I would need to put the car on ramps?

[G30 B58]

Originally Posted by tboooe

Yeah I has EAS do it. They seem to work on a ton of BMWs so I assumed they knew what they were doing.

The problem is, how do I get to the various components to tighten if the car is on the ground? I guess I would need to put the car on ramps?

Fudge it, take it back to them. Problem solved.

[HighlandPete]

Originally Posted by F32 N55

When doing suspension work, make sure the suspension is pre-loaded when tourquing down all the fasteners.

In other words, make sure the vehicle is on the ground and not hanging from a lift when fastening / torquing suspension components.

Exactly, or rubber bushes are working as 'helpers' and going to wear out prematurely. If odd suspension positions on tightening, the individual setting of adjustable springs mean springs are possibly compressed at different rates for a given ride height.

Fixed height springs can show up incorrect tightening with odd ride heights, adjustable springs allow hiding of the fitting error.

[rking117]

Originally Posted by tboooe

OK I did a quick inspection of the rear suspension and based on a visual it looks like the left spring is at a slight angle while the right spring appears to be pretty close to vertical. Based on this, maybe one of the springs is not seated properly. I will remove the rear tire and check it out.

that is exactly what i was talking about. there is something that is wrong in the setup of the rear suspension which allows for travel easier on the right rear than the left. I am glad you found this now as it would have eaten your rear tires up much faster than they should. Plus by then you may not be able to fix or return the items for replacements. I hope this works out well for u.

[rking117]

Originally Posted by HighlandPete

...adjustable springs allow hiding of the fitting error.

But what is not hidable (to the car at least) is the tension factor of the incorrectly installed or defective spring. It may have more tension on the spring to force a particular ride height but the torsion that is produced is also higher meaning less travel and likely weird ride patterns. essentially it is like running spring rubbers or adding a round on a track bar which will slightly compress the springs.

[raqautle]

I noticed on my 435i, in the secret menu, it shows 15.5l for I believe the right tank and 39.5l for the left tank, however, the left tank with the most drops faster. I may have gotten the left and right tank mixed up, or I'm misunderstanding it, but idt it'll make that much of a difference

I assume it's just defective but worth pointing out just in case

[tboooe]

Originally Posted by raqautle

I noticed on my 435i, in the secret menu, it shows 15.5l for I believe the right tank and 39.5l for the left tank, however, the left tank with the most drops faster. I may have gotten the left and right tank mixed up, or I'm misunderstanding it, but idt it'll make that much of a difference

I assume it's just defective but worth pointing out just in case

Interesting...so you are saying the car has 2 separate tanks? I never heard of that.

[DrivenByE30]

Fuel tank looks like this my man:



And it is basically underneath the rear seat.

[tboooe]

hmm...so it may make sense that my left side is higher than the right??

[raqautle]

Idk if it'll have that much of a difference though, passengers would have a much larger effect, idt it's that sensitive