Yes, cars definitly do not run at stoich during WOT, infact, many go into open loop in such conditions. (i.e O2 sensor is completely ignored). Richening the fuel is done for two reasons, cooling and a rich mixture also burns more slowly (it's less explosive) so it reduces EGTs and detonation. I VERY rearly experience detonation underboost. Mostly when moving from a dead stop. My point is that even the most agressive driver does not used full boost much, and that is probably the only time you are losing efficiency from ignition retard etc. Infact, regular gas contains more BTU per unit then premium because of the lower volume of additives. I've found that running premium I can sustain max boost almost indefinitely, but with reg, I can sustain it longer then I need it most times anyway. If it's hot and I'm towing I put some premium in....other then that it's the cheap stuff for my Saab.

posted by 67.70.60...

• Better performance for Linear when changing fuels??, Brent, Thu, 21 Oct 2004 19:27:02
  • Re: ...changing fuels?? How octane works, Geoff, Mon, 25 Oct 2004 06:02:43
  • Premium recommended......, Mike Lynch , Fri, 22 Oct 2004 13:54:59
    • Re: Premium recommended......, 93grlonrown, Wed, 30 Mar 2005 04:10:11
    • Use the best gas you can find--don't be a cheapskate, Drew in Houston, Sat, 23 Oct 2004 13:23:18
      • Re: Use the best gas you can find--don't be a cheapskat, Mark, Sat, 23 Oct 2004 18:47:00
        • Re: Use the best gas you can find--don't be a cheapskat, Drew in Houston, Sat, 23 Oct 2004 20:21:50
          • Re: Use the best gas you can find--don't be a cheapskat, Mark, Sat, 23 Oct 2004 21:47:11 <-- Viewing This Message
            • No offence meant, but you're changing your story here, Drew in Houston, Sun, 24 Oct 2004 01:21:27
              • Re: No offence meant, but you're changing your story he, Mark, Sun, 24 Oct 2004 14:57:10
                • Re: No offence meant, but you're changing your story he, Drew in Houston, Sun, 24 Oct 2004 20:46:48
              • Should be..."it IS an extremely poor decision to be, Drew in Houston, Sun, 24 Oct 2004 01:30:57
                • Re: Should be..."it IS an extremely poor decision to be, Brent, Mon, 25 Oct 2004 05:40:59
  • Re: Better performance for Linear when changing fuels??, Jeremy R., Thu, 21 Oct 2004 23:31:25
    • Re: Better performance for Linear when changing fuels??, Mark, Fri, 22 Oct 2004 09:03:01

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