Date: Tue, 6 May 2003 15:06:35 GMT
From: hohnopsamlid.invalid (Goran Larsson)
Subject: Re: How is the MPG measured/estimated

In article <3edfbvgqp4c3rue48pknqrt990vh2c4mirnopsamcom>, Nel Frikandel <> wrote: > I don't measure that exactly. I get 280 to 300Km's out of a full tank > of +/-40 liters. The trip computer says 11 to 14 L per 100KM. LPG conversions are very rare here in Sweden, so I haven't seen any LPG Saabs in real life. If LPG is bought by volume then the Pitagora-box seems to be doing its job. > O.K., that's the ret "hat" that is mounted on the valve-head then, > saying (in my case) 2.0 injection. I thought that was just a > fashionable thingy replacing the spark-wires, but there's more to them > then... The DI cassette contains four spark coils, one for each spark plug, and a capacitive discharge ignition system running from 400V. The Trionic engine management computer takes care of the ignition timing and signals to DI which spark plug to fire at the desired time. At any time a spark plug is not sparking it is conencted to 80V. The 80V will cause the gases in the spark gab to be ionized. The ionization is sensed and is then used by Trionic to detect the quality of the combustion and if a pre ignition (engine knock) happened. As the DI cassette uses the spark plugs both as spark plugs and as sensors it is very important that the correct spark plug type is used. Using types other than the NGK spark plug specified by Saab often results in problems. -- G–ran Larsson

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