Focus Fanatics - View Single Post - Regular Unleaded Gas (stock) vs Premium Unleaded Gas (tuned)
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Old 03-28-2012, 05:16 AM   #49
Dgc333
Focus Addict
 
Join Date: May 2011
Fan#: 85422
Location: Pembroke, MA
What I Drive: 2012, candy blue, SEL

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Quote:
Originally Posted by 1turbofocus View Post
I dont agree , the ECU is very smart and if it sees no knock the ECU can add in timing all on its own , so if your focus runs 87 and you add 93 you can get a good bit of use out of the 93 fuel both in mpg and performance , it isnt like to old carb / set timing days

The ECU under part throttle and cruise can add fuel as well so both timing and fuel can be added/removed all on its own

Tom
Adding timing doesn't automatically mean more power or efficiency. You only need enough advance to start combustion early enough to generate max cylinder pressure at approximately 20 degrees after top dead center. Any more and you loose power.

Just because 93 will allow you add more timing without detonation does not mean the engine needs it. An engine as powerful and efficient from the factory as the new DGI Focus engine is so well optimized throwing timing at it just isn't needed.
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