Michael Clark wrote:
>
> I seem to remember something about this. I remember reading (I guess it
> was an email from the list) that described the different bars and their
> diameters and stiffness. i thought this was in the maintenace and
> upgrades section of the DML homepage but it's not. Does anyone still
> have that? That should definately be posted as a FAQ or in the
> maintenance and upgrades section.
Damn, I'm replying to my own email..... ;~)
Well, looks like the archives can be useful sometimes. I did remember
reading this thing, just glad I was able to determine what month last
year or it would have been harder to find. Jon, any ideas on when we
will be able to search the entire archives again? Anyway here it is
guys......
***********************
Frank Ball's Pre-'97 Dakota Rear Anti-Sway Bar FAQ
Dodge puts a good anti-sway bar on the front of most Dakotas (it depends
on what options you get), but there is no rear anti-sway bar available
from Dodge.
There are three manufacturers for front and rear anti-sway bars for the
Dakota: Hellwig (SportTech), Addco, and Suspension Techniques.
The stiffness of the anti-sway bar depends on two things: the diameter
of the bar (bigger is stiffer) and the length of the arms going from the
pivot points to the axle (shorter is stiffer). I don't have data for
the length of the arms on the different sway bars, but I think they are
close enought that the difference in diameters dominates in determining
the
overall stiffness.
The stiffness of the bar is proportional to the diameter of the bar
raised to the 4th power, so a small increase in diameter yields a large
increase in stiffness. The Hellwig bar is 3/4", the Addco bar is 7/8",
and the
Suspension Techniques bar is 15/16". If we use the Hellwig bar as a
starting point we can calculate that the Addco bar is 85% stiffer and
the Suspension Techniques bar is 144% stiffer (32% stiffer than the
Addco
bar).
How stiff is good? Is more better? Anti-sway bars do several things.
They reduce body roll in turns. This is good, so more is better if this
is all we consider. The ratio of the stiffness of the front bar to the
stiffness of the rear bar will have a huge effect on understeer or
oversteer. As the stiffness of the rear sway bar is increased
understeer will decrease, eventually leading to oversteer. So don't go
sticking a
massive rear anti-sway bar on a Dakota with no front anti-sway bar (or a
small diameter front anti-sway bar), the result could be dangerous
handling (Oversteer is tricky, if you don't correct for it you spin out.
Understeer is safer, you just run wide in a turn and you can easily turn
in tighter to compensate. Almost all new vehicles are designed to
understeer).
The last effect of anti-sway bars concerns only offroad driving. They
reduce the ability of the suspension to track over very rough terrain,
which can cause the truck to get stuck because a drive wheel gets
airborn. Imagine terrain where the left front and right rear suspension
is
compressed. The opposite two wheels will need to extend fully to reach
the ground. The anti-sway bars resist this kind of twisting force and
can keep a wheel from reaching the ground. Serious 4WD owners often have
sway bar disconnects or just don't use them at all.
On my '95 SLT club cab the front bar is 1 3/32" diameter. Stock the
handling understeered very hard. With the Addco rear anti-sway bar
added it still understeers, but not near as much (and it will oversteer
under
certain conditions like bumpy turns or hard acceleration).
Most Dakota front anti-sway bars are 1 1/8" and come with rubber
bushings. Urethane bushing kits are available. Urethane is stiffer and
lasts
longer, but squeaks.
The Shelby Dakotas came with both front and rear anti-sway bars, but
they are both rather small in diameter.
Here are some testimonials from the mailing list:
>From: DFuller288@aol.com
Date: Thu, 4 Jan 1996 21:06:24 -0500
Subject: Dakota Anti-Sway Bar
Just installed a Hellwig SportTech rear anti sway bar on 93' 4x4 club
cab with 5.2L. Unit fit perfectly out of box. Simple bolt on operation
took less than 1 hour. Bar makes a noticeable difference in reduced roll
in
hard cornering. Got unit from Summit Racing Equip. for about $100
including
shipping. Well worth the money for in handling improvement.
--------------------------------------------------------------------------
I installed a Addco rear anti-sway bar shortly after buying my truck.
It is 7/8" diameter. It goes across the frame in front of the spare,
with
a dogleg to clear the spare tire, and the arms attach to the lower shock
mounts. It required drilling four 1/2" holes in the frame.
Polyurethane bushings. About $180. Body roll is greatly reduced, and so
is
understeer. Highly recommended. The truck still understeers on a
smooth road, but it is tolerable. Of course the back end will bounce out
when
it hits a bump. I'm wondering if better rear shocks would help, but I'm
know that the solid rear axle suspension has its limitations. There is
no
loss of ground clearance with the Addco bar. I think that the Hellwig
bar
mounts under the rear axle with the arms going back to attach to the
frame (the opposite of the Addco bar), and so the Hellwig bar might
reduce
ground clearance under the rear axle.
Frank Ball frankb@sr.hp.com (707) 794-4168 work
Rohnert Park CA '95 Dakota SLT Club Cab V8 5-Speed 2WD
-------------------------------------------------------------------------
Date: Mon, 8 Jan 1996 21:21:42 -0500
From: MagnumMrk@aol.com
Subject: Re: rear sway bars
Hey!
I did some calling today and found Suspension Techniques has a 1 1/8"
front and a 15/16" rear sway bar kit for sale.The cheapest place I found
to
buy it is A.S.A.P.The 2 bars come complete with urethane bushings for
$229.00.If you don't already have a front sway bar they will sell you an
installation
kit.
Mark
----------------------------------------------------------------------------
Corrections and additions are welcome.
Frank Ball 1UR-M frankb@sr.hp.com (707) 794-4168 work
Hewlett Packard (707) 794-3038 fax (707) 538-3693 home
1212 Valley House Drive Kawi KDX200, Yamaha XT350 YZF600R Seca 750
Rohnert Park CA 94928-4999 '95 Dakota SLT Club Cab V8 5-Speed 2WD
*********************************
---- Michael Clark mike@snakebite.com '93 MarkIII 4X2 V-8 SWB RC auto, DDBC, MP SBEC K&N FIPK, Flowmaster cat-back dual, WaterWetter Doug Thorley Headers, Moroso Blue Max wires http://userv.wt.net/~mclark/dakota.html http://userv.wt.net/~mclark/webring/ring.html
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