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04-14-2006, 07:10 PM | #37 | |
Resident Scion Guy
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Quote:
the combustion of air & gasoline causes the rapid expansion of gases (fumes) that cause the piston to be moved down, the more gases in the camber already the less the have to be "created" by combustion. That's why Turbos & S/C can work on a un-tuned car, but to keep a Soitch AFR you have to add more fuel to match the amount of air. it all has to do with compression, more air in the camber, then it can compress, In short, a leaner Stoich mixture will give more power.
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04-14-2006, 07:41 PM | #38 |
Drives: Copper-Orange Yaris RS Join Date: Apr 2006
Location: Georgian Triangle Ont.
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My experience with racing (granted it was motorcycles with carbs not FI), was that you would run the engine as LEAN as possible, without detonation.
That's why we did repeated plug chops. A lean mixture meant more horsepower. Is modern FI running on some principle I don't understand????? Please note ........ I didn't tune the engine, I only rode the thing. |
04-14-2006, 11:01 PM | #39 |
Speed Wrenchin'
Drives: 2006 Yaris 3 door, Bayou Blue Join Date: Jan 2006
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Stoichiometric AFR or 14.7:1 gives the best performance with the lowest produced emissions. The best economy can be obtained with AFR around 16 to 18:1. Leaner mixtures produce higher temps, burnt pistons and valves. The best power is usually obtained with AFR around 11.8 to 13.0 and that's the facts. More fuel, more power.
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04-15-2006, 03:14 AM | #40 |
Drives: BBM Yaris HB Join Date: Apr 2006
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more fuel only results in more power, because you can shove more air into the combustion chamber to burn the fuel. that's the basis of my understanding. too much fuel, and it doesnt get fully used in the combustion chamber, and you lose power. an 11.8-13 AFR sounds like something that a car with forced induction would want to be tuned to, ideally, to provide some headroom for detonation on a hot day, etc etc.
yes, leaner mixtures result in higher temps. but burnt pistons and valves, no. only if it is TOO lean, not tuned properly, and running outside of the parameters set by the ECM. when you run too lean and get detonation, the knock sensor picks that up and retards your timing, so you lose power. |
04-15-2006, 08:05 PM | #41 |
Speed Wrenchin'
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I am not referring to what the sensors and ECM do etc. The ECM will strive to keep to 14.7:1 which you should know is the best AFR for performance and emissions. I am only stating the fact and not looking for any arguments that a richer mixture produces more power. Thats why performance cars smell like a gas station when you are next to them.
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04-16-2006, 08:59 AM | #42 |
Drives: 2011 Rogue Join Date: Jan 2006
Location: Brampton, Ontario, Canada
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We're a little off topic. This is about the cold air intake right. I'm guilty of it too, but we should be posting about any new info regarding cold air intakes.
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04-16-2006, 11:07 AM | #43 |
I stay G'd Up
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I will be making a custom one for mine that will kinda look stock but it won't be.
Like this there is a tube that you fabricate to run down and suck in the air coming in fender and then you upgrade the tube going to the intake to a silicone one that drops temps and is bigger to suck in more air. Last edited by birdy; 04-16-2006 at 11:32 AM. |
04-16-2006, 01:37 PM | #44 |
Speed Wrenchin'
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Right on Birdy! Stick a K&N in there when they are available and remove the HC screen. Also you can replace the silencer mesh behind the TB with an O ring, or just cut the mesh off of the existing one.
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04-16-2006, 01:47 PM | #45 | |
Drives: 2011 Rogue Join Date: Jan 2006
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04-16-2006, 11:21 PM | #46 |
Drives: 06 yaris 5-dr le man Join Date: Mar 2006
Location: ontario, canada
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what is the impact of the different temperatures on a cold air intake?
can cold air be too cold? |
04-17-2006, 06:27 AM | #47 | |
Drives: 2011 Rogue Join Date: Jan 2006
Location: Brampton, Ontario, Canada
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04-17-2006, 07:43 AM | #48 |
Resident Scion Guy
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Nice Idea birdy, I like the Short Ram Intakes myself, & a (functional) hood scoop, but just a small one.
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