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Old 03-26-2012, 08:08 PM   #41
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Simple answer, no.


If you look into how the Octane system works you'll find that most boosters claim to raise by "points". What they don't tell you on the bottles is that 1 Octane is equivalent to 10 points. SO a bottle that claims to raise Octane by 8 points would raise 89 to 89.8, not 97 Octane.

It's my opinion that if you truly need something to raise the fuels Octane rating above that of pump fuel, you should be able to afford the costs of quality race fuel, else the mods you've done are all in vein. Also there can be relatively simple tricks to ward off spark knock W/O the use of high buck fuels. Simple things like indexing your spark plugs might help, running shorter gaps or lower heat range plugs.
I have indexed my plugs for a while now and it might just be placebo but it kinda seems that it helps some. I point the open end towards the center point of the exhaust valves.
I just wanted to say that I was in the store today and checked out the bottle of NOS Octain Booster (as pictured above) and the bottle said it boosted octain levels by a whopping 30 Points!

So... would that make a difference? From 91 to 94 grade. The only downside is that those bottles run close to $7 a pop.
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Old 03-26-2012, 08:26 PM   #42
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Question is at what point does the points lessen there effect? If I add this to 93 octane, would it really be 96..? Or more like 95? If it does not then $7 + a tank of 93, for a tank of 96 is not that bad of a deal....
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Old 03-26-2012, 08:57 PM   #43
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And it doesnt last long in the mixture from what I understand. My opinion octane boosters shouldnt be used

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Old 03-27-2012, 09:54 AM   #44
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Running 89/93 on an engine that does not require it is throwing money in the trash. The reason why some cars need to run the higher octane is because of their compression ratio. The lower the octane, the easier the fuel is to combust. With an engine running a high compression ration, that equals knock which is bad news. You want a fuel that will not combust as easily since it is being compressed further than usual. There is no power gain behind it, just the fact that certain engines need it to avoid predetonation. If your car does not require 89 or 93, it will not make a difference performance-wise. Think of higher octane as greater knock resistance. All 89/93 fuel would do on an engine that requires 87 would do is give you slight better fuel mileage since the fuel does not burn as quickly. However, that is pointless because you would probably save more running standard octane compared to the pricier mid-grade or premium.

However, the ECU tune will definitly give you a noticable gain in power, albeit a smidgeon less fuel economy. Why the higher octane, you ask? When you start messing with the spark/ignition varibles and fuel/air ratio (I'm guessing this is what the tune consists of) among other factors, you're going to need a fuel that will not detonate as easily. That's why with aggressive tuning, you need the higher octane. Even though the compression ratio isn't changed (only different pistons will do that for ya), you'll need premium fuel since the spark is advanced. Still, like I said before, unless you need the higher octane, running it in a regular engine is like throwing money in the trash. The ECU tune however will definitly help with get up-n go and I think it's worth paying more at the pump to have a happier Focus :D

Lastly, in regards to octane booster, same thing applies. Unless you really need it, don't use it. The only time I have ever purchased it was when my dad drove his Mustang down to Mexico for vacation. 89 octane was not available so we had to settle with 87 and a bottle of STP. Worked well, no knock. However, I wouldn't use it as a substitute for buying higher octane at the pump, as you'll be paying more for the booster than the fuel anyways. That stuff is mighty expensive
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Old 03-27-2012, 10:19 AM   #45
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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

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Old 03-27-2012, 08:32 PM   #46
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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...
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Old 03-27-2012, 08:51 PM   #47
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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.
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Old 03-28-2012, 12:29 AM   #48
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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.
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Old 03-28-2012, 06:16 AM   #49
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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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Old 03-28-2012, 11:34 AM   #50
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You obviously dont understand how the Ford ECU works

Tom
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