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Old 07-23-2019, 06:25 PM   #71
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Just 1 more thing. Page 130 2018 Ford Focus manual---For best overall vehicle and engine performance, premium fuel with an octane rating of 91 or higher is recommended. The performance gained by using premium fuel is most noticeable in hot weather as well as other conditions, for example when towing a trailer. See Towing (page 182).
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Old 07-23-2019, 07:06 PM   #72
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Quote:
Originally Posted by magnetic View Post
Like I said in my 1st post, I probably take some crap here. It works for me, and just wanted to let people know it reduces shudder and car performs much better.
You should just try it for yourself.
If it doesn't work for you, go back to regular gas. It will not hurt your car.


Oh Iím definitely going to try the 91 & report back. Unfortunately I have a full tank of 87 in the car right now so itís gonna be two weeks, but youíve got me curious now. I thought about picking up some Lucas Octane Booster & throwing it into that 87? But Iíll do a few tanks of 91 & see if the shudder on acceleration improves.



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Old 07-23-2019, 08:26 PM   #73
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Quote:
Originally Posted by magnetic View Post
Just 1 more thing. Page 130 2018 Ford Focus manual---For best overall vehicle and engine performance, premium fuel with an octane rating of 91 or higher is recommended. The performance gained by using premium fuel is most noticeable in hot weather as well as other conditions, for example when towing a trailer. See Towing (page 182).
No one has argued against higher-octane fuel for performance reasons. All anyone - myself included - is saying is that using 91+ cannot fix issues with the DPS6. It doesn't work like that.

Now, will your car feel different? Probably! Will it get better fuel economy? Maybe! Will it hurt to try? Of course not.

I'm just suggesting that you don't delude yourself into thinking that something that simply cannot fix the DPS6 is actually fixing it. If it makes you feel better, you do you. It's your money.
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Old 07-23-2019, 08:42 PM   #74
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Originally Posted by rczrider View Post
No one has argued against higher-octane fuel for performance reasons. All anyone - myself included - is saying is that using 91+ cannot fix issues with the DPS6. It doesn't work like that.

Now, will your car feel different? Probably! Will it get better fuel economy? Maybe! Will it hurt to try? Of course not.

I'm just suggesting that you don't delude yourself into thinking that something that simply cannot fix the DPS6 is actually fixing it. If it makes you feel better, you do you. It's your money.
Sorry, but it did. No shudder here.
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Old 07-23-2019, 08:44 PM   #75
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Quote:
Originally Posted by rczrider View Post
No one has argued against higher-octane fuel for performance reasons. All anyone - myself included - is saying is that using 91+ cannot fix issues with the DPS6. It doesn't work like that.



Now, will your car feel different? Probably! Will it get better fuel economy? Maybe! Will it hurt to try? Of course not.



I'm just suggesting that you don't delude yourself into thinking that something that simply cannot fix the DPS6 is actually fixing it. If it makes you feel better, you do you. It's your money.




I canít speak for other 2012-2016 Focus DCT owners, only for myself & if premium fuel eliminates shudder & hesitation from a start/stop, then itís worth it. I understand that the transmission is a manual & shifting points will be odd, however shuddering & hesitation on acceleration is what Iíd like to eliminate. So we have two DCT owners saying that theyíre noticed significant improvements with higher octane, so Iím going to do the same & see for myself. Iím not concerned at all about paying 20 cents more every other week, still gonna get 30+ mpg, itís not like Iíd be loosing any such as buying an ST.

After all, the purpose of an aftermarket tune is to improve performance, correct? Maybe a more simple route would be just to run premium fuel.



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Old 07-24-2019, 06:11 AM   #76
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Quote:
Originally Posted by Pokerrun388 View Post
I can’t speak for other 2012-2016 Focus DCT owners, only for myself & if premium fuel eliminates shudder & hesitation from a start/stop, then it’s worth it. I understand that the transmission is a manual & shifting points will be odd, however shuddering & hesitation on acceleration is what I’d like to eliminate. So we have two DCT owners saying that they’re noticed significant improvements with higher octane, so I’m going to do the same & see for myself. I’m not concerned at all about paying 20 cents more every other week, still gonna get 30+ mpg, it’s not like I’d be loosing any such as buying an ST.

After all, the purpose of an aftermarket tune is to improve performance, correct? Maybe a more simple route would be just to run premium fuel.
There are also Focus owners saying the "ground mod" fixed their shudder. Did it fix yours?

Look, I think you should try it out! Heck, if it's only $0.20 more per gallon, I'd recommend you run 93 forever. As I broke down in an earlier post, fuel savings might actually make it cheaper than running 87. Report back and let us know if the Ford engineers just happened to miss the simple fix to one of the most expensive defects in recent Ford history

I'm 100% on board with trying something non-destructive to fix the shudder coming from the DPS6. I'm just cautioning anyone else reading this that there is no way running premium will in fact fix your transmission and even if your car performs better, the damage being done as a result of a poor design with poor software is still being done since the fuel you use doesn't fix either of those problems.
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Last edited by rczrider; 07-24-2019 at 06:13 AM.
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Old 07-24-2019, 07:51 AM   #77
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Quote:
Originally Posted by magnetic View Post
Just 1 more thing. Page 130 2018 Ford Focus manual---For best overall vehicle and engine performance, premium fuel with an octane rating of 91 or higher is recommended. The performance gained by using premium fuel is most noticeable in hot weather as well as other conditions, for example when towing a trailer. See Towing (page 182).
For what it's worth, the language is different in the 2012 manual is different:

Octane recommendations

Your vehicle is designed to use
ďRegularĒ unleaded gasoline with a
pump (R+M)/2 octane rating of 87.
Some stations offer fuels posted as
ďRegularĒ with an octane rating
below 87, particularly in high altitude areas. Fuels with octane levels
below 87 are not recommended. Premium fuel will provide improved
performance.
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Old 07-24-2019, 09:29 AM   #78
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Can someone fill me in on a few details on our na (not eco-boost) engines?

I just searched and found that my engine has a compression ratio of 12:1? If thats true, that is pretty high as far as na engines go, right?

And to use 87 fuel the computer is using a knock sensor to adjust the timing. Either a cheap piezo, or a more complicated system that is measuring resistance of the spark plug gap...

From what I've read, the computer would push the timing out until it senses a knock, and then back it off a bit to find the optimum timing for each cylinder. Using 87 fuel, the computer is limited in how far it can advance the timing before it starts knocking. And using 91+ it can advance further, and gain some HP and efficiency?

Is my understanding of the octane issue accurate? I'm staying out of how this may or may not relate to DCT performance :) Just want to know if I'm right on the engine side.
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Old 07-24-2019, 10:50 AM   #79
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It is true that premium fuel will not hurt your car, though whether it can reasonably help transmission shudder is another matter.

The largest advantage to premium fuel is that it allows greater spark advance. In fact the defining characteristic of octane rating is how much spark advance it can tolerate before generating knock. At low RPM where clutch shudder typically happens, it's unlikely that the ECU is going to increase spark advance. High octane fuel in a car set up for regular fuel shouldn't make a difference except possibly at high RPM. If it does, it means that the regular engine tune is kind of crappy.
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Old 07-24-2019, 11:10 AM   #80
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Quote:
Originally Posted by SupraGuy View Post
High octane fuel in a car set up for regular fuel shouldn't make a difference except possibly at high RPM.
I think that (at least part of) the argument is that the Focus is the opposite: a car set up for premium that will accept regular. I can buy that, as no one purchasing a Focus would expect to need premium fuel.

Still, the rest of your explanation makes sense as it pertains to the DPS6, and just goes to back up the idea that using premium doesn't magically fix the problems inherent to the DPS6.

I'm sure Ford would love to come back to consumers and say they just need to put in high-octane fuel.
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