Originally Posted by omgsorr

its rubbing under heavy torque, havnt pulled it apart get but its pretty obvious.

What's rubbing? Where?

In agreement with reply on damaged pulleys.

[Jklad]

Like everyone said, start with new motor mounts, one side must be upgraded 335i part #. Also, you can buy the updated subframe, there's a new part #, but may not be necessary. Replace your pulleys to rule that out.

Also, if you goon through the hassle of dropping subframe and replacing mounts, it's a good idea to overlap the labor and replace your oil pan gasket because it will eventually start leaking, so it's one less thing you'll need to worry about.

[omgsorr]

Originally Posted by Jklad

Like everyone said, start with new motor mounts, one side must be upgraded 335i part #. Also, you can buy the updated subframe, there's a new part #, but may not be necessary. Replace your pulleys to rule that out.

Also, if you goon through the hassle of dropping subframe and replacing mounts, it's a good idea to overlap the labor and replace your oil pan gasket because it will eventually start leaking, so it's one less thing you'll need to worry about.

having trouble locating the updated mounts part numbers. are the 335is mounts compatible to e90 335xi?

[The Convert]

Originally Posted by omgsorr

having trouble locating the updated mounts part numbers. are the 335is mounts compatible to e90 335xi?

Look at your pulleys. I think a lot of people have misdiagnosed pulleys with a groove or burr for subframe rubbing.

[omgsorr]

Originally Posted by The Convert

Look at your pulleys. I think a lot of people have misdiagnosed pulleys with a groove or burr for subframe rubbing.

we replacing tensioner pulley (as it squeaks anyway a bit) but the belt literally shreds in same spot everytime. when we replace mounts we will look at that. this is all happening next week, won't be driving car at all really until then.

[N54Bob1988]

Check to make sure your power steering pump is tight. Ive seen it wiggle loose and cause issues

[omgsorr]

Originally Posted by N54Bob1988

Check to make sure your power steering pump is tight. Ive seen it wiggle loose and cause issues

That's our next area of focus. We just replaced both mounts. Transmission mounts. Belt shredded as we left lot to test drive it. Same spot it shredded it in other times. Gotta locate the source of this one then.

[Wes335XI]

Keep us posted. I'm curious what is going on. I have an 08 335XI and I've never heard of this issue until now. What kind of torque are you pushing?

[omgsorr]

Originally Posted by Wes335XI

Keep us posted. I'm curious what is going on. I have an 08 335XI and I've never heard of this issue until now. What kind of torque are you pushing?

havnt dynod it but usual mods. jb4 G5 downpipes intake. fixed a gap in my spark plugs which was causing a misfire whenever wot and then getting this issue now lol.