If it's an Aero or any other Saab that senses the presence of knock you can run 87. I've put 87 in a bunch of my turbo cars. Be aware that the fuel/ignition software was written with premium gas in mind, but if you don't go slamming out full load/boost at 3,000 rpm then it doesn't really matter what grade of fuel you're using; all the octane does is increase the temp/pressure at which the fuel will self-ignite. The compression ratio of a turbo engine is actually lower than other cars, so unless the turbo is thrusting air in and driving up the internal pressure you're scot-free.

I can't see how having less octane would cause your engine to run worse unless you were beating it and it was thus damaged, either by the (somewhat arbitrary) knock sensor malfuctioning and/or other pre-existing mechanical or electrical problems that were keeping the FI system from compensating for knock.

posted by 70.94.59...

• Car runs like cr*p, need help (long), epwvt, Tue, 18 Jul 2006 02:41:03
  • You should NEVER run 87 in an Aero...., David Ingram, Tue, 18 Jul 2006 07:40:22
  • Re: Car runs like cr*p, need help (long), chuck kusiak, Tue, 18 Jul 2006 07:00:57
  • maybe a solution, epwvt, Tue, 18 Jul 2006 05:25:55
    • Re: maybe a solution, epwvt, Wed, 19 Jul 2006 05:38:25
      • When did you last change the fuel filter?, EricG, Wed, 19 Jul 2006 13:53:24
        • Re: When did you last change the fuel filter?, epwvt, Thu, 20 Jul 2006 05:36:44
    • Re: maybe a solution, JonAero1, Tue, 18 Jul 2006 08:04:10
      • Re: maybe a solution, TML , Tue, 18 Jul 2006 09:26:53
      • There have been confirmed reports..., David Ingram, Tue, 18 Jul 2006 08:14:47
        • Addendum...., David Ingram, Tue, 18 Jul 2006 08:17:27
          • Re: Addendum...., TML , Tue, 18 Jul 2006 09:29:37
            • The owner's manual says..., soneway, Wed, 19 Jul 2006 17:38:55
              • Autobox=87, confirmed, David Ingram, Wed, 19 Jul 2006 19:37:53
          • Yes, the manual and the sticker inside the gas door...., TKC, Tue, 18 Jul 2006 08:24:45
            • Re: Yes, the manual and the sticker inside the gas door, epwvt, Tue, 18 Jul 2006 08:29:41
              • Automatics have the CSE engine...., David Ingram, Tue, 18 Jul 2006 08:44:28
                • Re: FPT knock, BobS, Tue, 18 Jul 2006 10:43:13
                  • Re: FPT knock, Bill Davies, Tue, 18 Jul 2006 12:50:15
                    • Low RPM low load knock, BobS, Tue, 18 Jul 2006 19:27:26
                • Re: Automatics have the CSE engine...., 951Freak, Tue, 18 Jul 2006 09:42:51 <-- Viewing This Message
                  • Octane=resistance to burning...., David Ingram, Tue, 18 Jul 2006 11:25:39
                    • volatility is probably a separate issue (long), Erik919kt, Wed, 19 Jul 2006 10:50:34
                      • Thanks, I got that wrong...., David Ingram, Wed, 19 Jul 2006 12:59:50
                    • Re: Octane=resistance to burning...., Noel, Tue, 18 Jul 2006 15:05:43
                    • Re: Octane=resistance to burning...., JonAero1, Tue, 18 Jul 2006 11:39:27
                      • Automatic?, David Ingram, Tue, 18 Jul 2006 11:51:28
                        • Re: Automatic?, epwvt, Tue, 18 Jul 2006 12:54:25

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