Quote:
Originally Posted by buzzfx4
So, I was finally just able to fill my tank up with the 87/89 blend and change the tune or to the 93 tune. Which I'm very please to say helped with my leanness and the annoying drone of the CAI in this cold weather.
Thanks Bill for the suggestion. Now all I'm wait on is that little trani update.
O yea, one little question, maybe one of the other members might be able to help answer too. Do I have to be worried about detonation when running the 93 tune on lower octane? Or does the thicker, below freezing, colder air equal out the air to fuel range? Also, any suggestion on a air temperature where using the 93 tune and lower octane fuel should be stopped?
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You shouldn't have to worry much about detonation for a couple of reasons.
First, the temperature of the fuel itself and the temperature of the incoming air cause the burn rate of the fuel to be lower. This is the property higher octane fuel has - a slower burn rate than the lower octane stuff. It is not "better" fuel, it just doesn't burn as fast. Rapid burning can cause too much expansion in the cylinders too soon, which works against the motion of the pistons and causes the "pinging" sound.
Second, if "pinging" IS detected, the spark knock sensors will tell the PCM to automatically retard your spark to stop it. Unfortunately, the spark will be retarded too much, and you'll lose some power.
I honestly couldn't tell you when to stop using the "winter" setting though. Maybe sometime towards the end of February?
- Jack
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Fri, January 8th, 2010, 01:11 AM
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