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NVH material Posted by Peter [Email]  (#2804)  [Profile/Gallery]
(more from Peter) on Mon, 1 Jul 2002 11:53:02
In Reply to: NVH, anyone using vibration damping material like, Gary, Mon, 1 Jul 2002 11:38:37 Members do not see ads below this line. - Help Keep This Site Online - Signup |
A dampening material will not solve your jarring ride problem. Are your tyre pressures adjusted to load carrying capacity? Imagine what your chassis is saying about the bone jarring ride. Alternators, pumps and transmissions are the first losers in the stiff spring game. What type of springs are you using and what is their rate of compression?
I posted this just a short while ago in the "Spring rate" post.
I am not trying to undermine any of the work that Brad is doing but must issue a word of caution.
Stiffening the springs and dropping the ride height on any vehicle as positives and negatives. The positives are a lower centre of gravity and
a
more sporty look along with an ability to carry a larger load on the axle.
The negatives are a more jarring ride at slower speeds and an increase in chassis noise. Since most of you are going for a look and
perfromance you have probably gone from the standard rim siz of 15" to a 16" or 17" or even 18" wheel. The design of a chassis, any chassis
has many considerations to be taken into account. Load carrying capacity, ride comfort and handling are some of the major issues at hand.
The designers and engineers did not just pluck numbers out of a hat when they came up with the ride height and spring rate of the vehicle.
The chassis rigidity accounted for what was going to be desirable. Merely adding shorter stiffer springs to a vehicle is not a guarranty that
you will be quick on the race circuit. A chassis must be tuned. Installing different rate springs, shorter sidewalled tyres
with the oe tyre pressure will not increase performance but actually have the opposite effect. Any increase in stiffness at the suspension will
cause the chassis to absorb more of the NVH (Noise/Vibration/Harshness). To insure a longer life of chassis and suspension bushings, along
with any type of metal fatigue that may occur, make sure that if you surpass the limit of chassis rigidity that you make the necessary steps to
redress them.
It is alot easier to sell stiffer shorter springs then it is to stiffen a vehicle's chassis. Cross bracing is a start and so is double welding seams.
Keep in mind that the SAAB 900 was designed to be also used as a pick-up
truck. This makes it an all round performer. A weakened structure will make a big difference when when we expect our vehicle to perform
its safety design and it fails us.
Make the changes you want but make sure that you are aware that other changes can be made to address the failings of the quick
engineered design.
posted by 137.144.161...
, Mon, 1 Jul 2002 13:34:41, Mon, 1 Jul 2002 11:53:02 <-- Viewing This Message
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