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      11-19-2012, 11:32 PM   #1
Old Cruiser
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Need to stop bottoming out on tires

Hey folks- nooby here but not new to modifing

I have a highly modified FJ Cruiser and know that every modification usually snowballs into a bunch of changes.

Here is my dilemma.

I have a 2010 135i Sport with what the dealership has told me is the upgraded BMW Performance suspension. I purchased the car used with 13XXX on the clock and Carmax was oblivious to any modifications

I recently grew tired of the run flats ride and the fact that through some wacked out camber, had worn through to the cord on the front passenger side tires edge. Got the alignment and set about replacing the RF with new shoes.

The main issue is the selection was more aggressive and now the car bottoms out on the tires when hitting long drop outs on the freeway. I figured this could have happened but its strange since the wheel tire combo is easily 15 lbs lighter per corner. I figure the unsprung weight would allow the suspension to be stiffer and react faster. Well 4x4 and fast cars are valved very differently as I'm learning.

Would a newer set of Eibach springs correct this or should I look into a full coil over system. Heck its most likely cheaper to just repurchase two new rear wheels that werent as wide...

Currently rolling the rear fender lips gradually with each bump

Wheels/ tires

Ended up at Tire Rack and purchased the OZ Ultraleggras -18 x 8 for the front and 18 x 9 for the rear (both 40mm offset)

Tires - BFG KDW2 (Conti's were on national backorder due to bubbling in the side walls) 215/40R18 front and 245/35R18 rear




I realize the offset for the rear is more aggressive and TR warned me about this. So I can either replace the rear wheels with 8" wide since they don't change the look or correct the suspension.

Ive never been one to back down from a modification...

Any suggestions on coilover set ups that would be stiffer but not run like a DTM.

Thanks in advance for any help!

-OC

Heres my FJ

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      11-19-2012, 11:38 PM   #2
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the most immediate solution would probably be taking it to get the fenders rolled...I think they sit perfect imo, but you could have a wheel specialist machine 3-5mm off the wheel to raise the offset a little bit


btw I love the FJ, I really wanted one when they first came out, and the new tan really makes me want one haha, too bad I need a 4 door truck
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      11-20-2012, 12:56 AM   #3
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I would say your bottoming out issue is due to the more aggressive offset of the wheels and not to do your shocks/springs combo.

Looking at the width of the wheels you could have gone with wider tyres but that would exacerbate your rubbing issues.

I think your best options are as DRedman45 said.

Getting the Eibach pro kit will lower your car even more than the BMW Performance suspension has and you'll have even more issues with rubbing.

If the above options aren't for you then I would say that your only other options are to either change wheels to a less aggressive offset or add more negative camber.

Btw, is it the front or the rear which is rubbing?
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      11-20-2012, 10:01 AM   #4
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Quote:
Originally Posted by DRedman45 View Post
the most immediate solution would probably be taking it to get the fenders rolled...I think they sit perfect imo, but you could have a wheel specialist machine 3-5mm off the wheel to raise the offset a little bit


btw I love the FJ, I really wanted one when they first came out, and the new tan really makes me want one haha, too bad I need a 4 door truck
Thanks for some insight. I believe at the current rate of contact- another couple of dips in the road and Ill have successfully rolled the rear fenders with the tires. They have been rolling the lip with each contact.

Thanks for the compliments on the FJ- lots of time and money in that one.


Quote:
Originally Posted by froop View Post
I would say your bottoming out issue is due to the more aggressive offset of the wheels and not to do your shocks/springs combo.

Looking at the width of the wheels you could have gone with wider tyres but that would exacerbate your rubbing issues.

I think your best options are as DRedman45 said.

Getting the Eibach pro kit will lower your car even more than the BMW Performance suspension has and you'll have even more issues with rubbing.

If the above options aren't for you then I would say that your only other options are to either change wheels to a less aggressive offset or add more negative camber.

Btw, is it the front or the rear which is rubbing?
The issue is with the rear wheels. Never knew camber could be adjusted on the rear or were you thinking it was the front. I guess I should have been more specific. Front is great.

So there wouldn't be a way to add a set of coil overs that would have a progressive rate spring that would start off soft to allow for the small stuff and then when the larger hits come into play, the 2nd rate plays in?

Ill consider the wheel option then

Thanks
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      12-18-2012, 03:12 AM   #5
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Bottoming out as in suspension travel? Why would you get even lower springs if the current shock spring setup is bottoming out already?

Unless you mean something else. Go get matching springs and dampers or a coilover set. If you are not tracking this car and want it for looks there are plenty of cheaper options. I dont inderstand ppl who buy expensive stuff just for looks. Its laughable.
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      12-18-2012, 09:08 AM   #6
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Quote:
Originally Posted by Old Cruiser View Post
Thanks for some insight. I believe at the current rate of contact- another couple of dips in the road and Ill have successfully rolled the rear fenders with the tires. They have been rolling the lip with each contact.


Thanks

I don't think so. That rear lip is very thick. You will destroy your tires long before.

Just get the rears rolled properly. I ran 12mm spacers on my stockers effectively making 40ET with 245's without rolling and no rub. A good roll and pull will get you all the space you need, which probably isn't that much.
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      12-18-2012, 09:26 AM   #7
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I think the OP means he's rubbing on the rear fenders, not bottoming out the suspension. Lowering springs will only exacerbate the rubbing issue. Best thing you could do is get a fender roll with a mild pull as well.

FYI for what it's worth, the bmw suspension is designed to hit the bump stops, and work with them to give you a firmer ride and better handling. A lot of people don't know/realize that its designed that way from the factory.
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      12-18-2012, 11:08 AM   #8
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Rolling/pulling the rear fenders would be the easiest solution.
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      12-18-2012, 12:16 PM   #9
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+1 with the fender roll^^^^ That would be easy and cheap.
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      12-18-2012, 12:56 PM   #10
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yeah i would say go with a fender roll! That FJ looks like fun!
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      12-18-2012, 01:13 PM   #11
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OP where are you located in TX? I know a guy that will do your fender rolling in Austin area, I'm in Killeen B/T/W
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      12-19-2012, 10:50 AM   #12
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Rolling fenders on these cars is not easy due to the inner fender.
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