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      08-30-2017, 10:00 AM   #1
Dino355
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Help! Rear tires rubbing through fuel filler pipe!!!

Hey guys,

I've recently fitted KW Clubsport coilovers to my 135i (am also running M3 LCAs) with stock rear rims and 255/35/18 tires. When i first fitted the kit the car was a little low and rubbed through the fuel filler pipe resulting in fuel leaks when filling up with gas.

I'm at the Nurburgring this week and this issue seems to have the pro workshops here stumped! I had the car corner weighted and set up (ride height raised a little too as it was too low). The fuel filler pipes been changed too but it's still rubbing against it through compressions on the track.

The KW Clubsport comes with 80Nm rear springs so they changed these over to 120Nm springs which made no difference. Then we tried 150Nm springs with a thicker spring mount (on the coilover adjuster) and even that didn't help! We've even turned up the rear bump adjustment on the dampers and that helped eliminate some of the rubbing but it's still there on the most extreme parts of the track.

Without having to raise the car up too high does anyone have any suggestions?? Would different bump stops help?

Thanks
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      08-30-2017, 04:50 PM   #2
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Have you checked the camber setting for the rear?
To reduce rubbing you could put a 3mm spacer on the rear wheels.
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      08-30-2017, 05:03 PM   #3
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Quote:
Originally Posted by John_01 View Post
Have you checked the camber setting for the rear?
To reduce rubbing you could put a 3mm spacer on the rear wheels.
This. Less camber or space out the wheels. Running a wide 255 like an R compound?
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      08-31-2017, 04:32 PM   #4
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If your tires are wide, it happens. Happened to my car as well with 255 section-width tires. Use a wheel spacer. Welcome to owning a 1-series, the wheel fitment is utter shit.
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      09-02-2017, 04:09 PM   #5
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Thanks for the replies.

This situation sucks.

I have around -2.0deg of camber at the rear.

Below is a picture showing the issue.

I'm running 255/35 section tires. I have 9.5J Apex Arc-8s to go on with 265/35 tires too! That will make the situation worse no doubt :

I plan to roll the rear arches, raise the ride height a little and run some spacers.

Edit: I forgot to mention we switched back to the 120Nm springs and changed the bump stops. The bump stops seem to have eliminated the majority of the rubbing but under the most extreme compressions at the 'ring it still rubs.

Here's a video of my last lap the other day which you can hear how bad it is:

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      09-04-2017, 06:32 AM   #6
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Apex moved from an et62 to an et58 wheel because of this. Not sure why this is stumping a shop... put a 3-5mm spacer on or reduce your camber to 1.5*.
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      09-05-2017, 08:13 AM   #7
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I don't think camber or spacers will help. The rubbing is at the top not the side. I think the only way is to increase ride height surely?
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      09-05-2017, 08:35 AM   #8
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Oh, it is rubbing at the top splash shield, not the filler pipe. You are going to have to increase ride height and possibly run stiffer rear springs.

How low is this thing?
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      09-06-2017, 07:21 AM   #9
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Quote:
Originally Posted by MightyMouseTech View Post
Oh, it is rubbing at the top splash shield, not the filler pipe. You are going to have to increase ride height and possibly run stiffer rear springs.

How low is this thing?
Didn't even see that pic from my phone... never seen that one before lol! Must be slammed to the ground fo rthat to happen. My rear tires are tucked and I've never had that happen (16k rear springs).
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      09-08-2017, 04:53 AM   #10
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It's not *that* low.

We tried two pairs of stiffer springs and it made no difference. Only the bump stops helped but didn't cure it entirely.

Have fitted the ARC-8s now which are wider which could make the problem worse (Haven't driven the car yet)







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      09-08-2017, 05:14 AM   #11
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What shock mounts are you running? (I recommend the Monroe ones) I'm guessing the clubsport shocks are either shorter or are running a much shorter bumpstop.

The wheels will camber in as the suspension compresses
The way to cure this is to limit suspension travel.
Make some spacers to sit on the shock shaft to engage the bumpstop sooner or get longer/firmer bumpstops.

Tyre selection may also help.

Last edited by titium; 09-08-2017 at 06:44 PM..
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      09-08-2017, 05:24 AM   #12
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for anyone else

I measured shock mounts

Dinan - approx 4mm
Stock - approx 13-14mm but easily compresses to 8mm by hand
Monroe - 14mm compresses to 13mm by hand.

You can limit suspension travel simply by switching to monroe mounts. I would not recommend dinan mounts with a short body shock for reasons posted above.

Monroe mounts are also well priced.
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      09-09-2017, 03:44 AM   #13
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Quote:
Originally Posted by Dino355 View Post
I don't think camber or spacers will help. The rubbing is at the top not the side. I think the only way is to increase ride height surely?
After looking at the photo you posted, it seems your coilovers allow too much bump travel. Its possible to adjust the bump travel without needing to change the ride height.

You can either use longer bump stops or add some "packer" on the shaft side of the damper. The packer makes the bump stop engage earlier.
Here is an example of what I'm talking about: https://resuspension.com/index.php/b...1-250-5pk.html

These ones are for dampers with 14mm shaft, but you need to find out the shaft diameter of the shocks you are using to be sure you get the right ones to fit the shaft diameter properly. You should be able to fit them on the top side of bump stop after pulling down the bump stop. Maybe start out with one 0.25" packer and see if there is still rubbing and add more 0.25" or 0.125" packer if its needed. Once you test to confirm the height of the packer is sufficient, its probably a good idea to remove the shocks and install them inside the damper dust caps to be more certain they can not fall out.
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      10-15-2018, 08:51 AM   #14
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Just noticed my passenger rear tire is rubbing in the same spot. TBH, I never hear any rubbing so I was surprised to see the rubbing on the fuel filler neck.

For those of you that have rubbed a hole all the way through, how hard is it to replace the fuel filler neck? It looks fairly straight forward but just want to make sure I am not missing anything.

I am running ARC 8 et62 9.5" with sumitimo HTR3 275/35, 3mm spacer, suspension is TC DA M3 shock with the dinan shock mount bushing. I am guessing the additional suspension travel is allowing the wheel to travel further up and make contact. I have a 5mm spacer I can try, but IIRC, it was causing slight rub on the fender lip. And I do not even know if the extra 2mm is enough to avoid making contact on the fuell filler neck.

Next set of tires are going to be 255 so I can avoid this completely.
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      10-15-2018, 01:46 PM   #15
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Quote:
Originally Posted by houtan View Post
Just noticed my passenger rear tire is rubbing in the same spot. TBH, I never hear any rubbing so I was surprised to see the rubbing on the fuel filler neck.

For those of you that have rubbed a hole all the way through, how hard is it to replace the fuel filler neck? It looks fairly straight forward but just want to make sure I am not missing anything.

I am running ARC 8 et62 9.5" with sumitimo HTR3 275/35, 3mm spacer, suspension is TC DA M3 shock with the dinan shock mount bushing. I am guessing the additional suspension travel is allowing the wheel to travel further up and make contact. I have a 5mm spacer I can try, but IIRC, it was causing slight rub on the fender lip. And I do not even know if the extra 2mm is enough to avoid making contact on the fuell filler neck.

Next set of tires are going to be 255 so I can avoid this completely.
Issue isn't tyre width issue it's suspension travel.

Mine rubbed through on stock wheels with 255 Street tyres.

I switched to monroe shock mounts and made shock spacers out of hdpe plastic resolved the rubbing completely.

I started with 8.5mm + the original 2.5mm spacer that came with the tck shock, resolved the rubbing issue completely but my 650i finned diff cover still touched the ground on big bumps Ended up adding another 5mm.

Replacing the filler is very straightforward.
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      10-15-2018, 05:52 PM   #16
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Oh man, thatís a bummer. My car rides perfect the way it is.

Thanks for the info. I guess I will start look into new bushings for the top then go from there.
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      10-15-2018, 06:07 PM   #17
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Quote:
Originally Posted by houtan View Post
Oh man, that's a bummer. My car rides perfect the way it is.

Thanks for the info. I guess I will start look into new bushings for the top then go from there.
Tck shocks are 25mm shorter then stock. Dinan mount probably adds around 5mm or so (they're 10mm shorter then stock but the stock ones are very soft and compress alot).

Monore mounts are cheap and much firmer then stock mounts.

You may find the monore mounts are enough alone to avoid any rubbing. Otherwise an additional 5mm spacer should do the trick.

This still gives you around 15mm more travel then stock. Imo if that isn't enough travel you're too low.
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      10-16-2018, 07:34 AM   #18
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Thanks brother. Any advantage going to something like the power flex bushing bs Monroe?

I am hoping this does the trick with the 5mm spacer if needed. Weird thing is I literally have never heard it rub back there, maybe I am having too much fun in the canyons when it’s touching and I just don’t notice it. Haha.

I’ll try and figure out a way to patch the hole in the fender liner once I swap the bushing to see if the tire is still touching.
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      10-16-2018, 02:01 PM   #19
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Quote:
Originally Posted by houtan View Post
Thanks brother. Any advantage going to something like the power flex bushing bs Monroe?

I am hoping this does the trick with the 5mm spacer if needed. Weird thing is I literally have never heard it rub back there, maybe I am having too much fun in the canyons when it's touching and I just don't notice it. Haha.

I'll try and figure out a way to patch the hole in the fender liner once I swap the bushing to see if the tire is still touching.
powerflex mounts should be similar from memory.

15.34.62.000.0 koni bump stop packer is what you want if you don't want to make your own spacers. they're 2.5mm each and can be installed/removed with the shock installed.
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      10-17-2018, 10:00 AM   #20
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Quote:
Originally Posted by titium View Post
powerflex mounts should be similar from memory.

15.34.62.000.0 koni bump stop packer is what you want if you don't want to make your own spacers. they're 2.5mm each and can be installed/removed with the shock installed.
Thanks. This is going to sound really lazy, but I have zero extra time right now. If I leave the dinan bushings in, I can start with 2 packers which is 5mm. That would get me back to where I would be if I went with the Monroeís or powerflex. If I am still hitting then I can add one or two more packers. Does stacking up to four packers sound ridiculous or like a bad idea? I have never used them before so I have no clue.

If I am still rubbing after that then Iíll just figure out a time I can replace the upper mount. Itís nit hard to do, but I would rather not have to remove the trunk liner, mess with my meth tank, etc.
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      10-17-2018, 04:06 PM   #21
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Quote:
Originally Posted by houtan View Post
Quote:
Originally Posted by titium View Post
powerflex mounts should be similar from memory.

15.34.62.000.0 koni bump stop packer is what you want if you don't want to make your own spacers. they're 2.5mm each and can be installed/removed with the shock installed.
Thanks. This is going to sound really lazy, but I have zero extra time right now. If I leave the dinan bushings in, I can start with 2 packers which is 5mm. That would get me back to where I would be if I went with the Monroe’s or powerflex. If I am still hitting then I can add one or two more packers. Does stacking up to four packers sound ridiculous or like a bad idea? I have never used them before so I have no clue.

If I am still rubbing after that then I’ll just figure out a time I can replace the upper mount. It’s nit hard to do, but I would rather not have to remove the trunk liner, mess with my meth tank, etc.
ah yep that'll also work.
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      05-12-2019, 10:05 AM   #22
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Just an update. Finally had a chance to fix my issue. Ordered the akg black rear upper shock mounts and a set of packers just in case.

I removed my passenger rear spring so I could compress the suspension and see what was going on. But just looking at the inner fender, it was fairly clear a spacer wouldn’t be the solution. And even if it was, anything larger then the 3mm spacer I am currently using wouldn’t be possible. The tire literally fills the entire wheel well. You could maybe fit a piece Of paper between the tire and the fender liner.

Sooo, I put in the black mounts and went on a canyon run with a group of buddies. Crossed my fingers and checked out my rub indicator strip, and I am back in business.

@titium was right on the money. I was suffering from too much suspension travel syndrome. The shorter da shock with the dinan extra travel upper chick mount was just enough to allow the tire to hit. So thanks for the advice and hope this helps someone else.
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