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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 03-01-2013, 11:10 AM   #91
Picoletray
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Originally Posted by NickCornell View Post
More mods = less mpg, generally. Intake will be more power, but more air, thus increasing air fuel ratio and lowering mpg


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I've seen varying opinions regarding factory paper versus the CAI or even drop in K&N, so that may or may not happen. Is the same true of the exhaust? Does that increase fuel ratio? I believe it just decreases resistance, and increases the decibals/HP/TQ.
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Old 03-01-2013, 05:38 PM   #92
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I would say exhaust in theory shouldn't negatively affect it since it's in essence making the car "exhale" easier


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Old 03-03-2013, 08:42 AM   #93
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Originally Posted by NickCornell View Post
I would say exhaust in theory shouldn't negatively affect it since it's in essence making the car "exhale" easier


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Not only does it exhale better, the reduction in pumping losses actually helps it inhale better as well. Generally speaking, an intake allows more air which requires more fuel (less mpg) while an exhaust can increase the scavenging effect and reduce pumping losses (more mpg).

In a strictly mpg-oriented vehicle, I would go with the K&N drop-in, snorkel delete, and a custom cat-back exhaust. The main reasoning for that is the fact that the less you spend on mods, the less you have to make back in fuel savings to cover the cost.
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Old 03-03-2013, 08:55 AM   #94
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Too big of a diameter exhaust kills back pressure on NA cars and reduces lowend power and I've seen dynos on more than a few small engines and I've seen overall power losses and maybe a bit of gain at the end of the power band but that's about it. So that power you killed on the lowend just made you car slower.
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Old 03-03-2013, 09:35 AM   #95
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Too big of a diameter exhaust kills back pressure on NA cars and reduces lowend power and I've seen dynos on more than a few small engines and I've seen overall power losses and maybe a bit of gain at the end of the power band but that's about it. So that power you killed on the lowend just made you car slower.
That isn't necessarily true. You are correct to a small degree in regards to Bernoulli's Principle, but what you are actually trying to refer to is the collector. That is why I stated a 'cat-back'. For a cat-back exhaust, diameter is actually more of a diminishing-gains scenario than a power-robber because the collector is staying the same. And this will vary depending on the rest of the system as well.

If you are tuning your exhaust you are mainly going to be concerned with the collector. That is where you can have 'too large' of piping. It can also be too-long, too-short, too-small, etc.

As for back pressure...

Back pressure is an enemy to exhaust. The closer to zero, the better the exhaust will flow. An engine is simply an air pump, and by saying that back pressure is necessary you're stating that an air pump will work better with the exhaust partially covered. There are numerous articles available to be read, and I can't deny that I used to believe this myth also.

As for power gains/losses, exhaust is an overly simple yet extremely complicated subject. The best exhaust for power is not the same as for mpg or even for sound. To tune an entire exhaust for mpg then negates the cost-saving that the engine will have.
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Old 03-18-2013, 02:17 PM   #96
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Has anybody actually checked their mpg after installing and intake only? or exhaust only? or both?
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Old 03-20-2013, 01:21 PM   #97
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So I was wondering if the dyno sheet you have in the first comment is with just the intake and exhaust installed or if it is with the other modifications you list in your signature?

Also I was wondering what the STS Kit is that you list in your modifications? Is it a turbo?

Thanks and your car looks good
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Old 03-20-2013, 01:31 PM   #98
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So I was wondering if the dyno sheet you have in the first comment is with just the intake and exhaust installed or if it is with the other modifications you list in your signature?

Also I was wondering what the STS Kit is that you list in your modifications? Is it a turbo?

Thanks and your car looks good
STS= Short throw shifter in this case, i.e. a shift kit that lowers the length of the shifter and the throws between gears.
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Old 03-20-2013, 01:38 PM   #99
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STS= Short throw shifter in this case, i.e. a shift kit that lowers the length of the shifter and the throws between gears.
Ah ha, That makes sense.

A gain of 22 hp and 20 TQ is quite good for just adding an intake and exhaust! I'm going to have to look more into modifying mine
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