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Probably not Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 5 Jun 2003 12:47:07
In Reply to: Question about gas octane vs. boost pressure?, DavidFL, Wed, 4 Jun 2003 16:17:17 Members do not see ads below this line. - Help Keep This Site Online - Signup |
If the trionic system detects knock, it adjusts both ignition timing and boost levels to prevent knock.
Octane rating is a measure of how resistant a fuel is to knock. The higher the octane, the more resistant to knock.
The Trionic system has a maximum boost level. If there is no knock at that boost level, that's it. If it senses knock, it'll reduce the boost. It DOES NOT just keep increasing the boost until it senses knock, then backs off. So if you get full boost at 91 octane, it doesn't matter if you go to 93, 100, or 110.
Every engine is different. The required octane ratings are for the majority of engines when they leave the factory. Some engines become less prone to knock over time (usually less compression), and others become more prone (usually carbon buildup). I've had some Saab turbos that ran at full boost on 87 octane - any higher octane was a waste of money. Others required 91 to get full performance.
If you can run the boost gauge to the end of the yellow/beginning of red, you're getting full boost on a stock engine. Running higher octane is a waste of money.
posted by 192.249....
, Thu, 5 Jun 2003 12:47:07 <-- Viewing This Message
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