Hi to all,
Ok I've just introduced myself in the general forum, you can see the thread link on my signature.
So now I wish to ask a technical question to the suspensions/axle/handling/alignement specialists here.
I have an Alpina B3 2.7, so the original suspension set has the following feature :
the front strut upper bearing is offset in 2 axis, the strut top attachement is then moved toward inside the car and towards the back. All in all it adds some negative camber, and some positive caster
here is a picture to illustrate :
A is the added negative camber.
B is the added positive caster.
C's are the original strut axis.
The Alpina factory specs are as follow, with Alpina springs fitted and original Bilstein shocks :
Camber : -2 +/- 0.3
Caster : +9.1 +/- 0.3
This is basically what you get on an original M3 with offset CAB's, as far as caster is concerned.
I plan to install Powerflex CAB centered or offset, so my question is :
How much more degres of caster I will get if I install offset CAB ??
It is important to know that because due to the caster induced by the upper strut mount, I may be overcaster if I put offset CAB.
If anyone has a before/after caster value for the installation of offset CAB or THR eyeballs that probably would help.
What is the risk ? The wheel will probably not touch the inner well, because as much as the offset CAB will move the wheel a tad forward, the offset strut mount are slightly moving the wheel aft.
So the main concern I have is overcaster, will the car will be over stable, or is that ok ? will it apply to much force on the steering system ( I have power steering ). I drive the car anywhere, small muntain roads, highway, normal street driving, never race...
If it is way over caster, then I will go for centered and keep original specs, now maybe the increase is not that big, and fitting offset is ok.
I hope someone can help.
Cheers / Pierre
Ok I've just introduced myself in the general forum, you can see the thread link on my signature.
So now I wish to ask a technical question to the suspensions/axle/handling/alignement specialists here.
I have an Alpina B3 2.7, so the original suspension set has the following feature :
the front strut upper bearing is offset in 2 axis, the strut top attachement is then moved toward inside the car and towards the back. All in all it adds some negative camber, and some positive caster
here is a picture to illustrate :
A is the added negative camber.
B is the added positive caster.
C's are the original strut axis.
The Alpina factory specs are as follow, with Alpina springs fitted and original Bilstein shocks :
Camber : -2 +/- 0.3
Caster : +9.1 +/- 0.3
This is basically what you get on an original M3 with offset CAB's, as far as caster is concerned.
I plan to install Powerflex CAB centered or offset, so my question is :
How much more degres of caster I will get if I install offset CAB ??
It is important to know that because due to the caster induced by the upper strut mount, I may be overcaster if I put offset CAB.
If anyone has a before/after caster value for the installation of offset CAB or THR eyeballs that probably would help.
What is the risk ? The wheel will probably not touch the inner well, because as much as the offset CAB will move the wheel a tad forward, the offset strut mount are slightly moving the wheel aft.
So the main concern I have is overcaster, will the car will be over stable, or is that ok ? will it apply to much force on the steering system ( I have power steering ). I drive the car anywhere, small muntain roads, highway, normal street driving, never race...
If it is way over caster, then I will go for centered and keep original specs, now maybe the increase is not that big, and fitting offset is ok.
I hope someone can help.
Cheers / Pierre
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