Quote:
Originally Posted by Zhehan
This is good information. I never thought about it like this before.
I have a piggyback tuner, the Perfect Power SMT-5, that I can use to advance the ignition timing, alter the fuel maps, etc. I will do some testing this month with it to see how much more timing advance I can get away with running E10 fuel. These engines are tuned pretty good from the factory regarding the timing maps with regular 87 Gasoline. The Fuel Maps are also pretty good in Closed Loop mode with the ST and LT functions dealing with live conditions. But, you can tweak the maps a bit here and there depending on said conditions.
I will also take a look at Fuel Trims with my Scan Tool. I'll report back to this thread after I have gathered some data. I'll probably take a few weeks of logging fuel economy and timing advance adjustments.
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Be very careful with timing advance. I at one point had thought about getting a piggyback that could retard and advance timing but then I decided against it. Too many times I've had to fill up with less than 91 octane due to the pump being empty, or my wife forgetting what kind to put in and puts in 87. If I were to have timing advanced on top of that it could get really bad really fast. In order to gain MPG's from running timing advance, it would have to be in cruising RPM's from 1500 to 2500 RPM. That's our engine achilles' heel when it comes to pinging, my worst ping sets in around 2200 RPM. I didn't see anything about your engine being supercharged so that'll give you a little bit of wiggle room but you might encounter it. Please do so in no more than 2 degree increments - that's the general rule for timing. Up it by 2, test, if works ok try 2 more. Also be aware that ambient temperature plays a huge role and if you tune it in a cold day in the 60's and then drive it on a hot day in the 90's the result will be much different.
