I have an '01 330ci with the sport package which (I'll assume) has the
lowered suspension and other suspension goodies. This car has noticeably
more body-roll than my previous '96 328is. Is this normal or is there
something wrong? Is this condition curable with an upgraded (aftermarket)
sway bar? If so, which one would you recommend? I would accept a slight
decline in ride comfort for a more level car in the corners. TIA for
Check the diameters of your anti-roll/sway bars against the
** ======================================================= **
Rear 18mm 33 55 1 095 758 (33 55 1 138 104 x 2pc)
Rear M3 21.5 33 55 2 282 181 (31 35 2 229 711 x 2pc)
Front 23.5 31 35 6 757 168 (33 55 6 751 269 x 2pc)
Front M3 26mm 31 35 2 229 755 (31 35 2 229 756 x 2pc)
** ====================================================== **
18mm 33 55 1 095 758 (33 55 1 138 104 x 2pc)
Sporty/MSport 20mm 33 55 6 751 267 (33 55 1 096 669 x 2pc)
M3 21.5 33 55 2 282 181 (31 35 2 229 711 x 2pc)
23mm 31 35 1 097 178 (31 35 1 097 179 x 2pc)
Sporty/MSport 24mm 33 35 1 094 542 (31 35 1 094 556 x 2pc)
M3 27mm 31 35 2 229 485 (31 35 2 229 436 x 2pc)
The first p/n is for the bar, the second is for the rubber
mounts. The brackets for the mounts appeared to be the same
across different bar sizes. There doesn't appear to be any
thing else necessary to swap bar sizes, aside from replacement
fasteners if your's are tired.
I don't have first-hand experience with the E46. That said,
I expect that you can change the rear bar yourself with simple
hand tools. If access to the front bar is similar to my E39,
you'll need help.
In checking out bars for my E39, I came across aftermarket
selections from Dinan, AC Schnitzer, Racing Dynamics and
Eibach. Eibach offered the largest rear bar and the lowest
cost for my application. RD is more (but competitive), Dinan
expensive and AC is somewhere out in lala-land. (I recognize
that the other bars offer rear-adjustability and in at least
one case urethane mounts.)
(I found the best prices for Eibach at 'www.ultrarev.com'.
'www.drivewire.com', 'www.import-racer.com' and
'www.drivewerks.com' weren't bad either. I have no prior
purchase experience with any of these outfits.)
However, M5 bars are the same size as the Dinan bars, much
less money and readily available from my friendly BMW
In your application, you have four alternate bars to choose
from for the front (five in total including the current bar
on your car) and two for the rear (three in total).
Keep in mind that if you only change one end of the car, there
will be a difference in the balance. Going up in size at the
rear only will tend to shift a neutral car toward oversteer.
Going up in size at the front shifts balance toward
I don't disagree with the remark above, but in a world where
aftermarket springs are rated by how much they lower the
average car instead of what their spring rate is, this makes
changing springs kind of hit or miss when the aim is to reduce
Alternatively, there are the OEM springs. A little guesswork
or judicious investigation will lead to replacements that
increase roll stiffness while retaining stock ride height.
Still, in the moonscape that is the road system I drive on, I
have no interest in reducing suspension travel or in
increasing spring rate. The M Sport configuration on my E39
is about the limit for this environment. For me, stepping up
the anti-roll bar size reduces body roll with a negligible
increase in overall suspension stiffness. It does not seem
like too much of a leap to assume that the same holds true
from the guy with the 330Ci Sport.
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