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Old 11-03-2004, 12:02 PM   #1
3rd Gear Member
Join Date: Apr 2004
Location: Toronto (Scarborough)
Posts: 321
When performance chips require 91+ octane...

When performance chips require 91+ octane, what will happen if you pump anything with a lower rating? Will it damage your engine? I've heard people say YES, and some say NO. Or does it just decrease performance?
Any feedback is appreciated.
'95 BMW 325i Schwarz II SOLD
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Old 11-03-2004, 12:08 PM   #2
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Join Date: Aug 2004
Location: Mississauga
Posts: 1,442
from what i understand...
that the lower octane could cause the engine to start pinging/knocking, which is pre-ignition... and if left undetected, it could damage your engine... how, i am not too sure...
this is what i understand, and have no problem with anyone claiming i am complettly wrong...
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Old 11-03-2004, 06:50 PM   #3
Join Date: Feb 2002
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"If the gasoline in an engine burns (combusts) prematurely (in terms of mere milliseconds), or combusts spontaneously, or too rapidly, or too violently, it is inferior combustion, and makes a pinging or rattling noise from the engine, usually when accelerating. Severe pinging can quickly destroy an engine. Chronic mild pinging can eventually result in serious damage to an engine. A sturdy engine can withstand occasional light pinging, though maybe with slightly accelerated wear on certain parts. When any pinging occurs, efficiency and power are reduced, and fuel consumption is increased. Put simply, pinging is not good."

On newer cars the knock sensors will catch the detonation early and send the message to the ECU to slash down the timing, but it's still not exactly healthy for the engine.
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