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There is a minimum safe octane rating...
Posted by BillJ (more from BillJ) on Mon, 3 Jun 2002 12:15:39
In Reply to: Re: Lower boost - 1993 Aero, -=PZ=-, Mon, 3 Jun 2002 11:24:00
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Unfortunately, you can't just dump any old junk in there and expect it to work without causing damage. If a fuel knocks so badly that Trionic reduces the boost right down to base (as far as it can go), how can you be sure that even base boost is low enough? A fuel that brought boost down this far would be pretty low-octane fuel.
There have been reports of Saab engines being destroyed recently in maountainous areas of the USA. On investigation, it turns out that the owners used lower-octane fuel than recommended because the recommended fuel was hard to obtain in the area. In combination with high altitudes (requiring more air compression to achieve the same boost pressure) and lots of torque requirement for driving up mountains, the poor fuel caused detonation beyond that which the Trionic system could deal with. The engines died from damage caused by detonation, even though the system dropped the boost to base. Base boost simply wasn't low enough to prevent detonation.
APC/Trionic can cope with variations in fuel octane, but only within limits. The Aero (if it's a Manual) has a higher minimum octane requirement, probably because base boost is slightly higher than other 9000s.
posted by 80.2.252...
Posts in this Thread:
- Lower boost - 1993 Aero, Les, Sun, 2 Jun 2002 22:47:55
- Re: Lower boost - 1993 Aero, Jim O, Mon, 3 Jun 2002 12:29:02
- valet mode, ben, Mon, 3 Jun 2002 12:14:44
- Re: Lower boost - 1993 Aero, -=PZ=-, Mon, 3 Jun 2002 11:24:00
- Unplug the BPC solenoid valve?, BillJ, Mon, 3 Jun 2002 04:39:17
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