For Questions Regarding WOFs/CERTs/NUMBER PLATEs

[Carsnz123]

Slightly on topic sharn. Apparently it's common for the n54/55 bmw guys to run 100% methanol in their WMI setup when they've maxed out the flow of the high pressure fuel pump and want a bit more go. I've seen several of those installs and it's got methanol fire written all over it. 

[zep]

What is the deal with machining brake rotors?

I need to create a pickup for a speed sensor and I'm toying with the idea of machining the teeth into the rotor, e.g.:

[cletus]

Can redrill stud pattern and machine surface of discs but nothing else according to the book. 

CCM brake chapter is due to be updated shortly but I'm not sure if anything is changing regarding disc machining 

[kws]

Having to machine a consumable part sounds like a sucky idea too

[zep]

19 hours ago, kws said:

Having to machine a consumable part sounds like a sucky idea too

I agree. Back to some kind of bolt on plan.

[Bling]

How picky is the sensor? Would it pick up the rotor vanes?

[GARDRB]

1 hour ago, zep said:

I agree. Back to some kind of bolt on plan.

Can you mount the sensor off a revised version of your caliper bracket and mount some sort of pickup ring to the back of your hub?

 

[zep]

On 19/07/2024 at 09:47, Bling said:

How picky is the sensor? Would it pick up the rotor vanes?

I thought about this, but the sensor diameter is wider than the vanes, so wasn't sure it'd actually pick them up.

On 19/07/2024 at 11:07, GARDRB said:

Can you mount the sensor off a revised version of your caliper bracket and mount some sort of pickup ring to the back of your hub?

 

I've already made the caliper brackets, so this is what I've come up with. Bolts to the back of the hub-rotor bolts (they were getting a nut anyway), and the sensor bracket just screws into the old rotor cover bolt holes on the knuckle.

[ajg193]

Can you pick up the bolts/studs with the sensor?

[zep]

13 hours ago, ajg193 said:

Can you pick up the bolts/studs with the sensor?

That was what I tried first, but the distance between the back of the knuckle and the end of the bolt was not enough to fit the sensor in. I think this plan will work well.

[zep]

I'm afraid that I already know the answer to this, but https://fabhouse.com.au/ are now doing lower Gemini control arms and replacement adjustable spring perches for the cross member. What is the possibility of this being certable?

Standard suspension.

The stock bump stop tower would be removed from the xmember and the replacement upper perch welded in.

[Nominal]

Custom A-arms can be OK

LVVTA_Info_01-2012_Custom_Suspension_Arm_Inspection_Approval.pdf

[cletus]

lvvta would likely not allow that design due to threaded rod ends loaded that way

[zep]

50 minutes ago, cletus said:

lvvta would likely not allow that design due to threaded rod ends loaded that way

What is the issue and what would need to change? Is it the weight-bearing/torque on the rod?

I've just looked at the manual, which says that they prefer shims or eccentric bushings for camber/caster adjustment, but that threaded can be accommodated if an inspection hole is drilled.

To add more information, the threaded sections are 32x3mm which is quite a lot larger than table 6.2 suggests.

[Bling]

Just me or do some welds on that arm look less than ideal? I know some don't look finished (I hope) but others look like welds I'd do if in a hurry.

[cletus]

from info sheet 04-2020

 

to find this info you must play the game of read every document ever and try to remember where it is written

 

Spherical bearing rod ends with threaded sections should not be used in a situation where a vehicle’s corner weight and suspension loads will travel directly through the threaded section of the joint ‘in bending’. In some cases, a spherical bearing rod end can be used as an inner joint on a loaded arm where the loads are significantly lower; however, the suitability is dependent on the position of the spring on the arm (the further inboard the spring, the greater the load on the inner joint), and such a situation may require engineering analysis to validate the loads, or may require individual approval from the Technical Advisory Committee (TAC).

 

 

 

[zep]

34 minutes ago, cletus said:

from info sheet 04-2020

 

to find this info you must play the game of read every document ever and try to remember where it is written

 

Spherical bearing rod ends with threaded sections should not be used in a situation where a vehicle’s corner weight and suspension loads will travel directly through the threaded section of the joint ‘in bending’. In some cases, a spherical bearing rod end can be used as an inner joint on a loaded arm where the loads are significantly lower; however, the suitability is dependent on the position of the spring on the arm (the further inboard the spring, the greater the load on the inner joint), and such a situation may require engineering analysis to validate the loads, or may require individual approval from the Technical Advisory Committee (TAC).

 

 

 

Ah yeah, thanks Clint. Sounds like a bit of a too hard basket situation. I am only really keen on the height adjustability. If I was to make just the spring perch to suit a stock diameter spring, and weld it to the xmember (replacing the bumpstop tower), would that potentially be less difficult to get through?

[440bbm]

Wasnt there a rule saying no mig welded suspension parts or am I dreaming? 

[Nominal]

2 minutes ago, 440bbm said:

Wasnt there a rule saying no mig welded suspension parts or am I dreaming? 

I think that's the case with DIY, maybe not so much for pieces bought from a supplier?

[cletus]

1 hour ago, zep said:

Ah yeah, thanks Clint. Sounds like a bit of a too hard basket situation. I am only really keen on the height adjustability. If I was to make just the spring perch to suit a stock diameter spring, and weld it to the xmember (replacing the bumpstop tower), would that potentially be less difficult to get through?

Yep that's fine