Made of 7075-T6 aluminum (commonly used in
high-strength applications such as aircraft fittings and brake
pistons), these lightweight adjustable rear arms are a rugged,
lightweight part. These arms address several issues:
- Performance alignments require much more adjustability and
camber than the stock eccentric bolt can provide
- When a BMW is lowered, it can cause additional and unwanted
negative camber (which leads to premature and uneven tire wear)
which the factory rear control arms do not have the ability to dial
out
- Factory rear control arms are frequently damaged when an
E36/E46 is towed by unknowing tow truck operators, who easily find
the factory arms a convenient (but incorrect) location to secure
the vehicle
These adjustable rear control arms allow for +1.0° to -3.0° of
rear wheel camber, depending on your needs and required
adjustments. Clevis and bushing ends are CNC machined. Center rods
are solid aluminum - stronger than the tubular links used in our
pro race cars for durability with harsh street and track use, but
still lightweight to reduce unsprung mass. Machined flats on the
center allow for easy and precise adjustments while on the
alignment rack. The mounting bushings are made from solid rubber
for a squeak-free ride.
THE
MANUFACTURERS TECH SPEAK:
Estimated strengths and fatigue loads of each of
the link sections of the arms are as follows as a factor of OE load
ability:
|
As a factor of OE
|
Est. Yield
|
Est. Max Fatigue design Load
|
|
OE
Arm
|
1.0
|
1.0
|
|
7075
T6 Link - BimmerWorld
|
2.8
|
2.7
|
|
Chromemoly Link
|
4.2
|
4.2
|
Definitions:
Overview:
The
72110 link is approximately 3 times stronger than the OE
link.
Note:
With
the use of the alternate chromemoly center section, the link is no
longer the weakest section of the arm. The weakest section is
the U-shaped end mount. We have not determined this alternate
section to be necessary.
We have not performed a fatigue analysis on these
parts. It is a relatively expensive proposition (engineering
time on our FEA software and/or machining and test time on our
cycle test bench.) In general, when a part approaches a 3
times safety factor of OE strength, we (and most auto and race
manufacturers) do not see a need to cycle test. At this kind
of a safety factor, the part should outlast the car.
As
with any adjustable suspension part, an alignment is required after
installation. Fits all E36 3 Series cars (1992-1999 318, 323, 325,
328, M3 - except 318ti), E46 3 Series cars (1999-2005 323, 325,
328, 330, M3), and all Z4.
