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Thread: Regular Unleaded Gas (stock) vs Premium Unleaded Gas (tuned) Reply to Thread
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Topic Review (Newest First)
04-02-2012 07:37 PM
focusedaddiction on play days you could always add a little 110 just for fun lol i do on autocross days, bout 50/50 110 and 91 octane allows for a little more timing on those days. that & a safety margin.
04-01-2012 09:33 PM
Outlaw5.0 No its not directed at Tom.
04-01-2012 12:46 PM
FocusBoy58
Quote:
Originally Posted by Outlaw5.0 View Post
I'm guessing he does not know how any modern OEM pcm with a knock sensor works. Plus he probably has not heard of MBT spark, location of peak pressure, 50 percent burn rate, and etc.
Are you saying that to Tom? Just curious if not then no worries. But Tom is the Focus guru and the goto guy for alot of things around here.

Alot of the newly added 2012 owners wouldnt know a thing about that tho.

But again if your not saying that to Tom then
03-28-2012 06:47 PM
Outlaw5.0 I'm guessing he does not know how any modern OEM pcm with a knock sensor works. Plus he probably has not heard of MBT spark, location of peak pressure, 50 percent burn rate, and etc.
03-28-2012 11:34 AM
1turbofocus You obviously dont understand how the Ford ECU works

Tom
03-28-2012 06:16 AM
Dgc333
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.
03-28-2012 12:29 AM
Jakefrom
Quote:
Originally Posted by 1turbofocus View Post
No cars can adjust for the octane you are running as there is nothing in the fuel tank that tells the ECU what octane your running so there is no way for a ECU to recalibrate , what they can do is see your o2 signal that may go leaner/rich and adjust with adptive learning and see the knock sensor and take out spark if you have knock

Tom
That's exactly what I mean and the reason I'm asking about whether or not the Focus will do the same thing.
03-27-2012 08:51 PM
Outlaw5.0 Tom is correct. If the computer senses any knock, it will start to retard timing. Yes our cars will knock slightly on 87 octane, its not uncommon to see the computer retard timing by 2-4 degrees. The use of midgrade or premium fuel will make sure the timing stays at full advance. Now granted with premium fuel there is room to add a few degrees of timing at WOT. For a untuned Focus, 89 octane in most cases is good enough.
03-27-2012 08:32 PM
budpln so what your saying tom is there is deff a benifit to using a higher octane fuel??? i put a half of a tank of plus in her yesterday and it could be a placebo affect but she seems smoother and honestly i think i might run plus from now on it deff seems to be running better with the better fuel iono i could b wrong...
03-27-2012 10:19 AM
1turbofocus 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
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