Fwd: re: trip computers (a thread from last week)

[Richard.Mansell@psemail.ps.net]

Message authorized by:
    : albrecht@ix.netcom.com%ussmtp at ccx400uk
     John
     
     An interesting addition to the thread, well for me anyway. When I 
     first purchased my car '89 V12 the trip computer was pretty much spot 
     on. 
     
     About a month after, I developed a lumpy idle that I could not fix. At 
     the same time as the idle problem started the trip computer began 
     reading incorrectly, it is out by about 2-3mpg. The distance travelled 
     reading is spot on, it is jut the fuel consumed that is incorrect.
     
     My friendly mechanic has had a play and has decided it is was a faulty 
     ecu (he had problems adjusting the mixture as well).  Since my car has 
     the Marelli ignition it took 5 months before he had another car in 
     with the correct ecu. We put the donor ecu into my car and the 
     problems appeared to go away.
     
     Until I get around to replacing the theoretically faulty ecu I would 
     like to get my trip computer reading more accurately so if you do 
     manage to assemble a calibration device I would be interested.
     
     Keeping a weather eye on the fuel consumption is the best method of 
     stopping me using the full power of the XJ-S all the time.
     
     I have already had one speeding ban and I don't want another. Don't 
     try racing police cars, they always win one way or another :-(.
     
     Richard
     Richard.mansell@ps.net
     
     


______________________________ Forward Header __________________________________
Subject: Fwd: re: trip computers (a thread from last week)
Author:  owner-jag-lovers@sn.no%ussmtp at ccx400uk
Date:    13/02/97 13:51


If there is enough interest, I'll design a circuit to allow user 
calibration of this.  Interested people, please e-mail me directly with 
your current "percent of inaccuracy" on your fuel consumption reading.
Please use the format X:Y, where X represents what your trip computer reports, 
and
Y represents what the gas-pump typically shows.  For example, if your trip 
computer
reports 20gallons, and the gas-pump shows 22 gallons, you would report this as 
20:
22.  I need the info to get an idea of the range of inaccuracy people are 
seeing.
     
Thanks,
John A.
84 XJ6

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