re. factory instrumentation accuracy & mpg
dans at audifans.com
Sun Jan 26 20:20:35 EST 2003
ben swann wrote:
> Yes - peeve # 2 on the new aquisition of the '91 200 20v tq avant. Has
> SJM chip with 2.5 bar pressure transducer AFAIK.
Lehmann stage 1 chip with 2.5 transducer.
> Gas mileage abysmal
> on the way home - 20MPG and no I was not easy on the gas and probably
> averageing over 70. My '87 5000 tq would get an easy 28 mpg under the
> same conditions. I thought Motronic was supposed to be superior at
> engine management, including economy, over CIS (CIS/motronic).
I thought I told you that I asked SJM about this and he correctly
diagnosed a failing tstat. That's the reason the mpg is low.
> [Does anyone know how the driving computer arrives at the number it
> alls average MPG? It definately has NOTHING to do with actual fuel
> flow! Does it do it's calcs based upon stored parameters and ideal
> situation testing done at the factory? Is there any way to recalibrate
The computer is balls on accurate at the moment. Leave it alone.
Am I gonna have to get down there and bring this poor car back? :)
Spend some time on SJM's site and the list archives for 200q20v, and
you'll be well enlightened.
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