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DURATEC Performance (2003-2007) The place to chat about any Duratec 23, 23E, and 20 engine performance, tuning and exhaust related upgrades.

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Old 04-15-2013, 06:10 PM   #21
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Originally Posted by dooor View Post
Felix, Help a dummy. What is "do a bsd"? Thanks
No dummy's here, We're all here to learn. BSD= Balance shaft delete. 23's/25's have a pr of balance shafts in the bottom of motor, which is driven off the crank, to smooth out the motor. The 23/25's having a longer stroke. You have a '07 zx3, so that means you have a 20 motor, so you don't have to deal w/ that, till you install a 23. It removes rotational & static weight, which makes the motor more responsive.
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Old 04-17-2013, 02:57 PM   #22
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Thanks
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Old 04-17-2013, 05:54 PM   #23
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From wikipedia: http://en.wikipedia.org/wiki/Octane_rating

<Octane ratings are not indicators of the energy content of fuels. (See section 4 of this page and heating value). It is only a measure of the fuel's tendency to burn in a controlled manner, rather than exploding in an uncontrolled manner. Where the octane number is raised by blending in ethanol, energy content per volume is reduced. >

<Many high-performance engines are designed to operate with a high maximum compression, and thus demand fuels of higher octane. A common misconception is that power output or fuel efficiency can be improved by burning fuel of higher octane than that specified by the engine manufacturer. The power output of an engine depends in part on the energy density of the fuel being burnt. Fuels of different octane ratings may have similar densities, but because switching to a higher octane fuel does not add more hydrocarbon content or oxygen, the engine cannot develop more power.>

Totally amazing about gas. Draw a 1/2 inch square and with the tip of the pencil, place 15 'dots' inside the square. One of those dots is gas. The rest (approximately) are air. That's the mixture feeding a cylinder each cycle.

Run the lower octane and trust the anti-knock sensor. Unless you are running a modified engine with high compression pistons or you have an air pump (compressor).

btw, I read that Chevron gets from 'the top' at the refinery, which is a finer and cleaner blend, with less contaminants that are found in 'the dregs' that other brands get out of the same batch.
Techron will keep the injector nozzles clean.
I have no commercial connection, just years working as a mechanic on small engines that have carburetors with main jet orifices so small that a piece of hair blocks half the fuel delivery to the cylinder.
If you can buy gas with no ethanol that would be best power and mileage.
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Old 04-17-2013, 06:23 PM   #24
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I didn't pay attention to Tapatalk, or I would have realized that my discussion is invalid because I own a different generation Focus.

Carry on
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Old 05-02-2013, 09:18 PM   #25
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Just to add, i asked tom to give me a 91 octane tune. He said theres no point it wouldnt do anything for my car, untill i did more upgrades. I have a header, cai, cat back.
So i guess you need some head work and some appropriate pistons.
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Old 05-03-2013, 11:25 AM   #26
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Originally Posted by jugglethese View Post
Just to add, i asked tom to give me a 91 octane tune. He said theres no point it wouldnt do anything for my car, untill i did more upgrades. I have a header, cai, cat back.
So i guess you need some head work and some appropriate pistons.
A logical upgrade would be a 23 motor or turbo yours.
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Old 05-03-2013, 11:34 AM   #27
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More power with higher octane? Are we talking power like you'd see a diff in the 1/4 mile using 93 vs 87? Or is it just a tad better throttle response and smoother power delivery? MotorTrend turned a 15.8 with a SE equipped with a 5 speed and 87 octane and that's one of the quicker numbers I've seen turned with a stock MK3.
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Old 05-03-2013, 11:57 AM   #28
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Quote:
Originally Posted by jugglethese View Post
Just to add, i asked tom to give me a 91 octane tune. He said theres no point it wouldnt do anything for my car, untill i did more upgrades. I have a header, cai, cat back.
So i guess you need some head work and some appropriate pistons.
That's odd.

Higher octane raises the detonation threshold of the motor. Meaning, there should be room to advance the timing and other ECU controlled stuff. Maybe Tom will post in here and explain this further?
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Old 05-03-2013, 01:58 PM   #29
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Quote:
Originally Posted by felixthecat View Post
A logical upgrade would be a 23 motor or turbo yours.
haha if i come across one ill pick it up, ive been looking but nothing cheap enough yet ;)
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Old 05-03-2013, 02:03 PM   #30
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Quote:
Originally Posted by replica81 View Post
That's odd.

Higher octane raises the detonation threshold of the motor. Meaning, there should be room to advance the timing and other ECU controlled stuff. Maybe Tom will post in here and explain this further?
yeah i would like to know myself, because i thought it might open up a couple more pony's. but the way my friends dad explained its burns colder and prevents misfires. nothing much to gain from it, untill you get work done to the engine that requires it. but even then its not the gas thats gonna get that extra power, its the parts you just put in.
He could be compleatly wrong and so could I.
If someone knows better let us know :)
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