The Cobra Adventure
Discussion
Standard custom car rollacoaster story incoming.
Custom Gaz Golds are here.
Ah ffs.
God bless owners groups.
Some random old chap from the USA asked me if I’d had the damper bodies shortened.
I was all like nah just built them up to E36 DTM specs.
He was all like, measure the damper bodies.
Mine are too long by 40mm, meaning I’ve lost that in compressing and gained it in droop.
Not ideal.
So I’m going to make some new top mounts which raise that mounting position by 40mm.
Will allow me to keep the right ride height and keep all my fancy new geo.
Pictures and 1000 words and all that.
Here you can clearly see my issue. 40mm gain in length, 10mm loss in stroke. Stroke I'm not bothered with.
The OEM top mount, mounts the bearing 30mm below the mounting face of the strut tower. So I need to bring that up to 10mm above. I also need to bring the centreline of it outward by 1mm
Custom Gaz Golds are here.
Ah ffs.
God bless owners groups.
Some random old chap from the USA asked me if I’d had the damper bodies shortened.
I was all like nah just built them up to E36 DTM specs.
He was all like, measure the damper bodies.
Mine are too long by 40mm, meaning I’ve lost that in compressing and gained it in droop.
Not ideal.
So I’m going to make some new top mounts which raise that mounting position by 40mm.
Will allow me to keep the right ride height and keep all my fancy new geo.
Pictures and 1000 words and all that.
Here you can clearly see my issue. 40mm gain in length, 10mm loss in stroke. Stroke I'm not bothered with.
The OEM top mount, mounts the bearing 30mm below the mounting face of the strut tower. So I need to bring that up to 10mm above. I also need to bring the centreline of it outward by 1mm
I was getting worried about suspending a corner from 3 M8’s.
But after reading 10.9 M8’s can take ~1.8t of force each, I feel a little better.
As there’s no way the OEM mount can take 5t through it.
nd to double double check, looked up the forced through a Macpherson strut in an extreme pothole strike.
Assuming 300kg on the strut at rest.
A pot hole strike would produce a force of 11052 newtons. (FORCE ANALYSIS OF SUSPENSION STRUT UNDER VARIOUS LOAD CASES 2016.)
Which is about 1152kgf of upward force.
The max force the fasteners can take is <5000kgf.
So a 4+x safety margin.
But after reading 10.9 M8’s can take ~1.8t of force each, I feel a little better.
As there’s no way the OEM mount can take 5t through it.
nd to double double check, looked up the forced through a Macpherson strut in an extreme pothole strike.
Assuming 300kg on the strut at rest.
A pot hole strike would produce a force of 11052 newtons. (FORCE ANALYSIS OF SUSPENSION STRUT UNDER VARIOUS LOAD CASES 2016.)
Which is about 1152kgf of upward force.
The max force the fasteners can take is <5000kgf.
So a 4+x safety margin.
Gassing Station | Readers' Cars | Top of Page | What's New | My Stuff