A turbocharged engine loses less at high altitude than a naturally aspirated one does, because the turbo is pumping more air (hence more oxygen) through the combustion chambers which aids combustion, whereas a naturally aspirated engine obviously has to rely on itself alone. I'm sure most people on this board don't need me to point this out! I don't see how the boost at high altitude can in itself cause any harm, I believe the problem stems from using inadequate octane fuel, as is pointed out here by another post. The problems associated with using too low an octane are possibly exacerbated by the altitude and relative lack of oxygen. I would have thought that Trionic engine management would make allowances for this, and consequently reduce boost? Doesn't it take oxygen and octane into account? I suspect this is a case of a story having some basis in truth, and getting carried much further... When turbocharged Formula One cars raced in Mexico city in the mid - late 1980's, for some reason the four cylinder cars did relatively better than the six cylinder cars. I never heard a logical explanation for that, if anybody knows one, I'd love to hear it.

posted by 209.227.178.1...

• Nasty Rumor about the Viggens and Aero's ...?, MD, Thu, 13 Dec 2001 19:05:17
  • Re: Nasty Rumor about the Viggens and Aero's ...?, ANDREW , Fri, 14 Dec 2001 14:51:06
    • turbos & altitude, JMC, Fri, 14 Dec 2001 15:55:23
  • Everyone.... as memory serves me, Dave W, Fri, 14 Dec 2001 14:02:48
  • Low octane could do it, Jeff A., Fri, 14 Dec 2001 12:24:28
  • If you put sub 90 octane fuel, AdamB , Fri, 14 Dec 2001 11:54:32
  • This IS unfortunately TRUE....., TERRY, Fri, 14 Dec 2001 11:19:56
    • Re: This IS unfortunately TRUE....., saabracer7600, Sat, 15 Dec 2001 15:33:03
    • Re: This IS unfortunately TRUE....., LDH, Fri, 14 Dec 2001 14:50:23
      • 90 Octane!!!!!! Thats Water ;-), Skiddins, Fri, 14 Dec 2001 22:11:40
        • US octane ratings are different from European octane, AdamB , Sat, 15 Dec 2001 07:02:51
          • Re: US octane ratings are different from European octan, BillJ, Sun, 16 Dec 2001 14:09:12
  • Boost & altitude, JMC, Fri, 14 Dec 2001 10:04:43 <-- Viewing This Message
  • I live in Denver and talked with one Saab owner, Anton, Fri, 14 Dec 2001 09:24:23
    • Probably does the classic annual oil change ;-) n/m, Cannastra, Fri, 14 Dec 2001 09:36:41
  • Hasn't been reported here..., Scott Paterson , Fri, 14 Dec 2001 02:34:06
  • YES, saabracer7600, Fri, 14 Dec 2001 00:22:58
    • Oh yeah I live in colorado, saabracer7600, Fri, 14 Dec 2001 00:28:41
      • Re: Oh yeah I live in colorado, MD, Fri, 14 Dec 2001 10:44:03
        • Re: Oh yeah I live in colorado, Jim S., Fri, 14 Dec 2001 20:37:55
        • you can get 100 octane at the pump..., RedSPG18, Fri, 14 Dec 2001 12:07:16
  • that's ridiculous, dave, Thu, 13 Dec 2001 22:25:02
  • Re: Nasty Rumor about the Viggens and Aero's ...?, Bill D, Thu, 13 Dec 2001 19:16:58
    • Re: Nasty Rumor about the Viggens and Aero's ...?, MD, Thu, 13 Dec 2001 19:20:56
      • Re: Nasty Rumor about the Viggens and Aero's ...?, aerodriver4, Thu, 13 Dec 2001 21:49:49
        • Re: Nasty Rumor about the Viggens and Aero's ...?, Justin VanAbrahams , Thu, 13 Dec 2001 23:19:30
  • first time Ive heard that, but reall doubt it., nickR, Thu, 13 Dec 2001 19:13:48
    • Re: first time Ive heard that, but reall doubt it., MD, Thu, 13 Dec 2001 19:16:42
      • Check to see if your mechanic's nose is getting larger., Jon , Thu, 13 Dec 2001 23:08:18

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