BruceH
BBB Big Bore Boss 322
Id believe that if i didnt have over 30 revisions from Lund and all of them had knock. Eventually they blamed it on bad gas. Im sure 15 different stations all had bad gas at different times in the year.
I have had knock due to shitty winter gas, they leave a lot more aromatics in, I doubt they even know the octane is 91 any more under typical driving conditions.. I'm just a little more careful on the shoulder of my driving season, no loading up hills at a lower rpm, etc.
I added some octane booster and knock went away. I guess I have to find better gas.
Or go flex fuel tune.
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They might also have too much timing into the tune
Well before this shitty winter blend hit, all was fine.
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FWIW cold air is denser. This means it is concentrated and needs more fuel and/or less timing.
IIRC there is no longer winter gas. It's all the same.
Do a dyno or run at the drag strip in good air (cold and dense). It makes a difference in power output and more power due to denser air (think of boost) requires less spark advance or less resistance to ignition via a higher octane.
Just another reason to keep the knock sensors active and let them pull spark advance when needed. This is especially important in cold winter climates.