Will Mandatory dyno testing kill quattro and 4wd?

[Pedro Faria]

In NJ they also use the state dyno test, for brake performance and
ballancing
for AWD they stick the probe in the tail and run "2500 rpm" static tes

Pedro


>From: Dan Cordon <cord4530 at uidaho.edu>
>To: quattro at audifans.com
>Subject: Re: Will Mandatory dyno testing kill quattro and 4wd?
>Date: Fri, 05 Sep 2003 10:28:32 -0700
>
> > Efraim Gavrilovich <egav at wireless2000.com> writes:
> >
> > > I live in Vancouver, Canada and I have to take my Q-car every year
> > > through a mandatory emission test. There are two dyno's there, one
> > > for regular cars and one designated for 4WD vehicles. Test is done in
> > > Neutral at 60mph with front and rear wheels being spinned by test
> > > machine. By the way, my 15 years old 5KTQ passed with a huge margin
> > > last time I went through this test. This is with original muffler.
> >
> > Neutral? Dyno spinning the tires?  That makes no sense.
> >
>
>I had the same thought when reading the post. Working frequently with
>chassis dynos, I think I understand what's going on. In order to
>determine the power requirements that a vehicle needs to maintain a
>speed, a coastdown test must be performed. For instance - A sleek, light
>audi may only require 35 hp to maintain 60 mph on level ground, while a
>boxy hummer (or H2) may require over 60 hp. So to properly load the dyno
>for a given speed, a coastdown test is done. Usually this entails
>driving the vehicle up to speed (on a real road) and collecting data
>while coasting from 60-20 mph. Then, this data is replicated on the dyno
>*before* a dyno test is actually done. The dyno operators will adjust
>parameters so that coasting down on the machine replicates coasting on a
>road.
>
>However, the above usually just applies to FTP driving cycle testing.
>I'm guessing that none of the local emissions stations are so elaborate.
>So in conclusion, I have no idea what Efraim was talking about by dyno
>testing in neutral at 60 mph.
>
>--
>Dan Cordon
>Mechanical Engineer
>University of Idaho - Engine Research Facility

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