Date: Mon, 05 Sep 2005 07:02:14 GMT From: "LC" <goalie22nospamail.com> Subject: Re: Calibrating Turbocharger
"Colin Stamp" <col.dustbinnospamp.plus.com> wrote in message news:53rmh1h8la05npindh3drmf42bv2710qsonospamcom... > On Sun, 04 Sep 2005 21:44:53 GMT, Malcolm William Mason > <mwm1(spam)nospamedu> wrote: > >>On Sun, 4 Sep 2005 18:25:07 +0200, "Henrik B." <saabnospamPAM_tdcadsl.dk> >>wrote: >> >>> >>>"Malcolm William Mason" <mwm1(spam)nospamedu> skrev i en meddelelse >>>news:nilkh1tdk2ggd4qt0vb2si6vmkldfodpvdnospamcom... >>> >>>> This was the reply: >>>> "You find a longer steep hill. In 4. or 5. gear, drive with full >>>> throttle in >>>> the range from 2,500 - 3,500 rpm. Do this 3 or 4 times. The adaption >>>> takes >>>> place within 2,750 and 3,250 rpm. You need for the car to stay within >>>> that >>>> rpm-range for at least 4 seconds. >>>> >>>> If you do nothing, the adaption will take automatically, but will need >>>> a >>>> longer time." >>>> >>>> >>>> What is being accomplished here? I do not understand what is going on. >>> >>>Hi Malcolm. >>> >>>Your car has Saab's Trionic enginemanagement. This is one of the worlds >>>most >>>advanced engine control systems. It's an adaptive systems, which means it >>>constantly "learns/reads" the driving conditions: Air temp (and >>>moisture), >>>hills/mountains, speed a.s.o. >>> >>>If you for whatever reason disconnect the battery, the Trionic will reset >>>to >>>standard values. Once you start driving again, the Trionic needs to learn >>>the driving conditions at new. This takes some time, where you might >>>experience decreased performance. You can speed up the process, by doing >>>as >>>mentioned. >>> >>>Do you get it? >> >>Hi Henrik,, >> >>I am still bewildered. >> >> >>What does it have to "learn" that is not pre-set at the factory? > > There's a lot of variables that can't be fully known by the factoy > setup. i.e. type of fuel, tolerances in injector flow-rates and > fuel-pressure, different exhaust fitments etc. etc. > >> >>By the way , do you have any idea as to what speed the auto will be at >>during a full throttle down hill 5th gear 3500 revs run? > > The idea of using a hill is to keep the speed down. You drive up it, > not down it. > > Cheers, > > Colin. Another thing to learn is how you drive can be different than how others drive, where you accellerate/decellerate will be wildly different from your next door neighbor, wife, best friend, etc. It's unfortunate that there isn't some sort of NVRAM that will hold this information with a 9v battery or something to keep it from being lost every time the battery gets d/c'd.
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