Speed Humps

StevieH · Post by **StevieH** » Sun 12 Sep, 2010 12:47

Dear All,

I bought a BMW Z3 Roadster in July, but seem to struggle when going over speed humps. Even when I approach a road hump with caution and go over very slowly, it often makes a horrible, scraping noise underneath the car and I am concerned that I am doing damage to the fuel tank.

I literally have my foot on the break as I go over a speed hump, and find it extremely frustrating.

Has anyone got any advice?

siwilson · Post by **siwilson** » Sun 12 Sep, 2010 14:34

Sounds like your car is lowered or has sagged? I never had any issue at standard ride height, but when lowered you have to be careful.

Have you had a look underneath to see what might be scraping?

Ian_C · Post by **Ian_C** » Sun 12 Sep, 2010 19:24

If you post a side on pic of your car we'll let you know if it's been lowered. Seems like it has from your experience with road humps.

TitanTim · Post by **TitanTim** » Sun 12 Sep, 2010 19:44

Need really to see a piccie of your Zed

I have 3 speed humps at work and there are a couple at my local supermarket and never experience any probs with them.

Tim.

Dave L2 · Post by **Dave L2** » Mon 13 Sep, 2010 06:35

I only get problems on very severe humps and it's the exhaust box that scrapes since having it changed.

siwilson · Post by **siwilson** » Mon 13 Sep, 2010 07:24

Dave L2 wrote:I only get problems on very severe humps and it's the exhaust box that scrapes since having it changed.

I think you have answered your own question then. It seems very likely that either an incorrect part or incorrect fitting is to blame. It could be just as simple as a rubber exhaust mount has popped off or broken.

Take it back and get them to fix it before you do any damage.

BenZ3-2.0 · Post by **BenZ3-2.0** » Mon 13 Sep, 2010 12:24

mine scrapes on most bumps, its the standard exhaust......but i do have coil overs lol.

pingu · Post by **pingu** » Wed 15 Sep, 2010 19:13

If you can, go over them at an angle. Not practical on a busy road, but it does work.

Post by **Robert T** » Wed 15 Sep, 2010 20:16

pingu wrote:If you can, go over them at an angle. Not practical on a busy road, but it does work.

This also applied to boarding ferries.

Cheers R.

Dave L2 · Post by **Dave L2** » Wed 15 Sep, 2010 21:23

siwilson wrote:
Dave L2 wrote:I only get problems on very severe humps and it's the exhaust box that scrapes since having it changed.
I think you have answered your own question then. It seems very likely that either an incorrect part or incorrect fitting is to blame. It could be just as simple as a rubber exhaust mount has popped off or broken.

Take it back and get them to fix it before you do any damage.

It's a custom exhaust with a larger than normal back box.

KingCarl · Post by **KingCarl** » Thu 16 Sep, 2010 01:49

i agree with Pingu - get a good angle at it - maybe tricky if other folks around but slow down in plenty of time etc