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Old 03-25-2012, 04:40 AM   #21
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Originally Posted by DoomsdayFAN View Post
Does adding Octane Booster to your car do anything beneficial? So what if I get a premium octain tune and then add a can of octane booster?

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.
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Old 03-25-2012, 05:02 PM   #22
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I see. Well then I just wont worry about the octane booster then.

As far as regular vs premium gas, is it true that you get better MPGs with premium, even though it costs more overall?
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Old 03-25-2012, 09:02 PM   #23
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I see. Well then I just wont worry about the octane booster then.

As far as regular vs premium gas, is it true that you get better MPGs with premium, even though it costs more overall?
No. Unless your car is made to run on the higher octane. If you put 91 octane in an svt it will get better fuel mileage than with 87( Not that I would put 87 in my svt). This is because the svt is designed to run on the 91. Google octane if you really want to know more.
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Old 03-26-2012, 01:01 AM   #24
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I'm talking about getting a tune for it. Are you going to get better gas mileage with an 87 tune, or are you going to get better gas mileage with a 91 tune? In other words, I'll be getting a tune either way, but which tune will get me better gas mileage? 87 or 91?
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Old 03-26-2012, 08:30 AM   #25
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Quote:
Originally Posted by DoomsdayFAN View Post
I'm talking about getting a tune for it. Are you going to get better gas mileage with an 87 tune, or are you going to get better gas mileage with a 91 tune? In other words, I'll be getting a tune either way, but which tune will get me better gas mileage? 87 or 91?
I believe it depends on the kind of tune you want, you can tune more for performance or economy. 91 burns a little smoother than 87.

Does the ECU in the focus not adjust to octane ratings like other cars? Example, my V6 accord will adjust to different octanes and advance or retard timing to compensate, but switching from one to the other you need to go about 500 miles on the certain octane before the computer recalibrates for the octane. Running 91 instead of 87 will get rid of pinging and get me slightly better milage although on 87 I can average 35mpg on the freeway (about 1 mpg better with 91). A honda engineer has said running 91 instead of 87 will give you a 10hp bump in the accord as well. All this without a tune.

Thanks for bearing with me, trying to expand the knowledge of my vehicles.
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Old 03-26-2012, 10:16 AM   #26
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SCT xc3 tuner goes a lot

Quote:
Originally Posted by Jakefrom View Post
I believe it depends on the kind of tune you want, you can tune more for performance or economy. 91 burns a little smoother than 87.

Does the ECU in the focus not adjust to octane ratings like other cars? Example, my V6 accord will adjust to different octanes and advance or retard timing to compensate, but switching from one to the other you need to go about 500 miles on the certain octane before the computer recalibrates for the octane. Running 91 instead of 87 will get rid of pinging and get me slightly better milage although on 87 I can average 35mpg on the freeway (about 1 mpg better with 91). A honda engineer has said running 91 instead of 87 will give you a 10hp bump in the accord as well. All this without a tune.

Thanks for bearing with me, trying to expand the knowledge of my vehicles.
Thats pretty inpressive= 10hp running 91 over 87 on a stock motor. All I said was w/ a 91-92 octane tune you'd better mpg than w/o= you wouldn't have your foot into it w/ a tune than w/o. You will find w/ a tune your motor runs better= more spark/ injecter timing, etc. With a tune you have ascess to a lot of different parameters= wot fuel adjustment/ idle rpm/ spark advance/ trans shift points/ tire size-rev per mile/ cooliing fan temps/ rev & speed limiter & a lot more.
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Old 03-26-2012, 10:24 AM   #27
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I believe those benefits are usually only for engines that have VCT and even further variable lift also. As the Focus does not have that (the SVT has the VCT on only one cam). I think you also tend to have more knock sensors and other electronics to determine detonation and then the best timing and fuel map combo to use.

Please correct me if I am wrong.

also 1 MPG increase, for at minimums 10 cents per gallon for a 1MPG increase? looks like around me its about 15 cents average more for 87 (our 91 octane up here at 4,700 feet). $1.95 more for 13 miles distance... that's not cost effective, as over two fill ups, i would go 26 more miles for $3.90... at this moment I can get 1 gallon of regular for less than $3.90 and go further than 26 miles on it.
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Old 03-26-2012, 10:43 AM   #28
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Thanks for the info and clearing up my confusion, I kinda assumed that most cars now could sense the higher octane and adjust. Most of the V6 accord guys don't get 91 for the extra mpg, more to prevent knock, advance the timing for the extra hp and for the boosted/built guys it really helps alot. I've only ran 91 once to clean out my injectors and noticed a slight better response but no power bump from what I could tell (Ass dyno).

Edit: Also stand alone ECU's are very rare/ non-existent for the accord so the octane bump along with the timing advance is beneficial for us.
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Old 03-26-2012, 12:10 PM   #29
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Quote:
Originally Posted by iminhell View Post
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.
Indexing plugs on flat top pistons and a combustion chamber like we have wont do anything , indexing plugs is for domed pistons that come close to the plugs , you would index the plugs to keep the piston from hitting and closing the the wire on the plug

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Old 03-26-2012, 12:22 PM   #30
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Quote:
Originally Posted by Jakefrom View Post
I believe it depends on the kind of tune you want, you can tune more for performance or economy. 91 burns a little smoother than 87.

Does the ECU in the focus not adjust to octane ratings like other cars? Example, my V6 accord will adjust to different octanes and advance or retard timing to compensate, but switching from one to the other you need to go about 500 miles on the certain octane before the computer recalibrates for the octane. Running 91 instead of 87 will get rid of pinging and get me slightly better milage although on 87 I can average 35mpg on the freeway (about 1 mpg better with 91). A honda engineer has said running 91 instead of 87 will give you a 10hp bump in the accord as well. All this without a tune.

Thanks for bearing with me, trying to expand the knowledge of my vehicles.
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
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