Is Canadian Gas poor quality?? Are the octane levels bogus??
I've been wondering why my engine always dips down to a lowly 9-10 degrees of timing when I go wot.
based upon the values in my stock low octane table and high octane table, it ought to be able to use up to 15-18 degrees under ideal conditions, however the 9-10 that it is using indicates that it is leaning towards the low octane values.
I only use 94 octane gas primarily from Chevron, occasionally from Petro Canada.
Initially I expected that this was obviously being caused by the various spark correction modifier tables that exist to drag down the timing due to conditions such as IAT, ECT, burst knock/knock, torque mgmt, etc.
As time has passed and I have slowly become more comfortable with HPT logging, analyzing the data, relating what tables are used when and where etc., piecing together the big puzzle so-to-speak, it appears to me that the modifiers are not pulling the timing down because the data logged indicates ideal conditions so as not to apply a reduction in the amount of timing.
so this leaves me wondering what is left to look at?
I cannot find any other tables that reduce timing due to certain conditions.
I seemingly use the best gas avail out here.
I have often heard talk and rumours that Canadian gas is substandard compared to various U.S. sources.
I'm not sure what that means though.. Doesn't the gas have to be measured and conform to some sort of industy standards?
How do I know that 94 is actually 94??
I have no idea, it just says it is 94 on the pump - a red sticker - it must be!!
Is Canadian 94 eqivalent to U.S. 94?
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Originally Posted by my_bd
