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When choosing a Dynamometer (Chassis or
Engine Dyno) to use / buy, what should you avoid?
If I was going to buy or go to a Dynamometer to use for my
own vehicle I would be interested in the following...
-
If
I wanted to set up a drag car or bike, using loads of boost
/ nitrous and it was "on the edge" so to speak, I would find
myself a suitable INERTIAL CHASSIS DYNAMOMETER! It
needs to have big diameter seriously grippy clean drum(s)
(Definitely NOT dual rollers here!) It would need to
have POWERFUL fans and airflow, an experienced operator, and
would probably be a DynoJet Dyno of one type or another.
A braked system is simply unsuitable for an application like
this! The dyno itself, along with plug readings, and
experience would be the best way to set this car / bike up.
Gas analysers, etc are useless in these situations.
-
If
I wanted to set up a stock or mildly tuned cars / bikes fuel
injection system, or set up a carburettor systems jetting or
ignition properly, I would find a decent Braked system,
maybe a Bosch one or similar, maybe with twin rollers, with
a good gas analyser, and allow lots of time. This is
the best way to set up this kind of vehicle.
-
Stock or mildly tuned car for fault finding, or for a health
check, as above.
-
Any vehicle for an accurate power curve, I would put on an
inertia dyno, like the DynoJet, or my own DynoPower ones.
If
I was buying one I would consider the above, look at what
kind of work I mainly wanted it for, and choose accordingly!
Remember though that you cannot hold RPM steady on an
inertia dynamometer! But they ARE cheaper! AND
more
accurate and repeatable
for back to back power testing...
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