Quick Question: Rear Subframe Stud Torque Spec

[bubbajan21]

I'm putting back together my rear subframe after new bushings and IE Camber and Toe Kit and I can't find a spec for what the rear bolts (the ones that pass through the bushings) should be torqued to. I've found this link but I don't know if they should be torqued to 30 or 56 ft-lbs.

http://e30world.com/suspension/BMW-E30-Rear-Subframe-Bushings-Replacement

Thanks in advance!

[jlevie]

I don't have a reference handy, but those sound low. Something around 80ft-lb seems more reasonable.

[mRodiek]

As hard as they go, mine have been great for 6months+ now

[Boise]

Bentley has the same numbers

M10 is 30 ft-lbs
M12 is 56 ft-lbs

So if its a 10mm bolt (width) its 30 ft-lbs, 12mm bolt is 56.

I did mine last winter at 56 ft-lbs and the subframe hasn't come off...yet. I figure the engineers at BMW know what they are doing.

[RobertC]

Personal Torque Values

Subframe Pins: 80ft lbs (95ft lbs for 75D or solid bushings)
Diff Carrier Bolt: 65ft lbs
Trailing Arm Bolts: 65ft lbs

PS: Rear subframe studs are 14mm.

[Boise]

Personal Torque Values

Subframe Pins: 80ft lbs (95ft lbs for 75D or solid bushings)
Diff Carrier Bolt: 65ft lbs
Trailing Arm Bolts: 65ft lbs

PS: Rear subframe studs are 14mm.

Interesting, I just looked at RealOEM and they have a 14mm nut to go with the bolt, so I wonder if those Bentley torque specs are for something else.

[bubbajan21]

Hmmm, so it looks like listed spec if 56 but everyone runs 80??

[MR 325]

I tighten mine until they're tight.

[Aluke123]

Bentley has the same numbers

M10 is 30 ft-lbs
M12 is 56 ft-lbs

So if its a 10mm bolt (width) its 30 ft-lbs, 12mm bolt is 56.

I did mine last winter at 56 ft-lbs and the subframe hasn't come off...yet. I figure the engineers at BMW know what they are doing.

Pretty sure those are the torque specs for the front subframe bolts, not the rear ones.