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DURATEC Ti-VCT Performance (2012-Current) The place to chat about any Duratec 2.0L Ti-VCT engine performance, tuning and exhaust related upgrades.

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Old 05-22-2012, 11:11 PM   #281
Kabigon
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Quote:
Originally Posted by eweisbard View Post
If the engine is not knocking or pinging, there is no performance to be gained by octane alone.
Consider the 2013 Mustang GT (5.0L Ti-VCT V-8 engine)
Recommended fuel: unleaded regular
HP: regular fuel: 402 @ 6,500, premium fuel: 420 @ 6,500

Two questions:

1) Do you think that the 5.0L engine is constantly "knocking or pinging" when using unleaded regular?

2) Why don't you believe that is possible for the PCM to adjust for different octane levels?



Quote:
Originally Posted by eweisbard View Post
Octane is for antiknock, if its not knocking whay do you need more.
To get better performance. Isn't that simple?

Did they teach you in school that the octane requirement of an engine can change according to various tuning parameters?
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Old 05-22-2012, 11:16 PM   #282
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Quote:
Originally Posted by Kabigon View Post
Consider the 2013 Mustang GT (5.0L Ti-VCT V-8 engine)
Recommended fuel: unleaded regular
HP: regular fuel: 402 @ 6,500, premium fuel: 420 @ 6,500

Two questions:

1) Do you think that the 5.0L engine is constantly "knocking or pinging" when using unleaded regular?

2) Why don't you believe that is possible for the PCM to adjust for different octane levels?





To get better performance. Isn't that simple?

Why didn't they teach you in school that the octane requirement of an engine can change according to various tuning parameters.

Wow....let's go around the world AGAIN here. You don't get more HP from higher octane, you get more HP from more timing (to a point).

You do realize that you're contradicting yourself now, right?
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Old 05-22-2012, 11:22 PM   #283
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Well that's kinda the point here

Quote:
Originally Posted by eweisbard View Post
The main discussion here is an 87 octane engine being run on higher octane, and if ther would be an advantage. Like I said in my previous post, you cant trust 87 octane to be 87 octane. It could be 65. Known for a fact to be true at times. If you run poor quality fuel and switch to 93 you would probably notice a difference. They did not talk about at school the requirments of specific engines, just that if they are not knocking they dont need more octane. One thing that concerns me about this discussion is that everyone says that efi can adjust for knock from low octane, but at what cost. If timing must suffer for no knock then performance should too. But this is not even what the whole discussion has been about, it is extra octane, is there a benefit.

You're kind of flailing now. The engine has quite a high compression ratio and adjusts ignition timing and other variables according to the spark knock detection. High octane or premium gasoline will definitely allow it to adjust itself to run better than on regular gasoline. Whether it's worth it or not is another subject.
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Old 05-22-2012, 11:59 PM   #284
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Quote:
Originally Posted by Power Surge View Post
Wow....let's go around the world AGAIN here. You don't get more HP from higher octane, you get more HP from more timing (to a point).

You do realize that you're contradicting yourself now, right?
Q: "Octane is for antiknock, if its not knocking whay do you need more."

A: To get better performance.

There is no contradiction so what is your point?

Do you think that the 2013 Mustang 5.0L engine is constantly "knocking or pinging" when using unleaded regular?
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Old 05-23-2012, 12:01 AM   #285
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Quote:
Originally Posted by eweisbard View Post
The main discussion here is an 87 octane engine being run on higher octane, and if ther would be an advantage. Like I said in my previous post, you cant trust 87 octane to be 87 octane. It could be 65. Known for a fact to be true at times. If you run poor quality fuel and switch to 93 you would probably notice a difference. They did not talk about at school the requirments of specific engines, just that if they are not knocking they dont need more octane. One thing that concerns me about this discussion is that everyone says that efi can adjust for knock from low octane, but at what cost. If timing must suffer for no knock then performance should too. But this is not even what the whole discussion has been about, it is extra octane, is there a benefit.
I'll as you again but in a different way ... is a 12:1 compression ratio engine an 87 octane engine?


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Old 05-23-2012, 12:32 AM   #286
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My g god

The whiners aren't those that have used 91/93 or higher and seen benefits

The whiners are those that haven't and can't understand our perspective.

We've proven that premium fuels in GDI engines improved performance, especially with our higher 12:1 ratio.

You morons now do us a favor and dog up facts to back up your statements instead of just throwing out useless statements about how premium is a waste of money.
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Old 05-23-2012, 01:01 AM   #287
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I have an example...from first hand experience, how premium may be able to save fuel.
On my way home from work every day, there is a long, fairly steep hill with a 30 mph speed limit. When running 87 octane, without fail, the car would downshift, rpm's go up, and I would lose .5-.7 mpg on the dash display by the time I reached the top...Now, running 92 octane, I can pull the hill without the car downshifting, and only lose .2-.4 mpg to the top. My assumption is that under a heavier load, the premium fuel does not knock, timing is more advanced, more power is being generated, and the transmission doesn't need to kick down.
Not scientific, nor is it huge savings, but it is an example.
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Old 05-23-2012, 06:50 AM   #288
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Quote:
Originally Posted by eweisbard View Post
I guess theres no room for opinion on this forum.
signed "the troll"
Opinion is fine. Don't try and make it a fact unless you have proof that's all.
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Old 05-23-2012, 07:03 AM   #289
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After running 4 tanks or 89 octane .... i went back to 87 for a test tank.
I lost 2 mpg and the car is definetly less responsive.

Debate all you want ... the best way is to test it for yourself to see if it will do any good for YOU.

For me ... i will be using 89 octane from now on.

We have a 12.4 gal tank, with a difference of 10 cents a gal ... it will cost you a max of a $1.24 to check it for yourself!!
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Old 05-23-2012, 08:26 AM   #290
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Quote:
Originally Posted by MKorn View Post
After running 4 tanks or 89 octane .... i went back to 87 for a test tank.
I lost 2 mpg and the car is definetly less responsive.

Debate all you want ... the best way is to test it for yourself to see if it will do any good for YOU.

For me ... i will be using 89 octane from now on.

We have a 12.4 gal tank, with a difference of 10 cents a gal ... it will cost you a max of a $1.24 to check it for yourself!!
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