QUOTE(computers4kids @ May 19 2006, 12:09 PM)
Raise the fuel pressor on the system to 60 psi
In other words--make it run rich.
QUOTE
Install a variable pressure regulator with a higher pressure fuel pump that senses engine load off the manifold which then increases fuel pressor with more demand.
Make it run rich.
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Play with the air/fuel mixture screw
Make it run rich.
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loosen the tension on the air sensor flap
Make it run rich.
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Trick the CPU with resistors into thinking the engine is cold thus enriching the fule mixture
Make it run rich.
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Put an aftermarket kit on the cold start valve as a way of pumping extra fuel into the system when throttle is moving towards full throttle position.
Make it run rich.
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Put a wind-up propeller on the back that can be released when extra umph is needed
Hey, an idea that won't make the engine run rich!!!
Looks like we need a little basic edumication on how internal combustion works, here....
You do want to burn fuel, yes. But fuel needs air to burn! There is a chemically "perfect" ratio of air to fuel when you are burning the fuel--it's the amount of air that contains just the right amount of oxygen to completely combine with the amount of fuel during a burn. This winds up being about 14.7 parts air to one part air (all measured by mass, BTW). This is called the "stoichiometric" ratio.
If you put more air in than can be "used" by all of the fuel, a number of things happen. One of the most important things for modern cars is that catalytic converters work much worse--but that's not a concern for us. Our concerns are that combustion temperatures tend to get higher with more air, and less overall energy can be used to move the piston downward in the cylinder. This means less power! Having more air than the "correct" amount is known as a "lean condition". It is easy to get this in a 1.8; just let it develop an air leak...
If you put more fuel in (or less air) than this "perfect" amount, you get a "rich" condition. This causes a number of things to happen. For one, catalytic converters work poorly and can actually be damaged by a rich-enough mixture! (Again, not something most of us have to worry about.) You also get cooler temperatures, because the extra fuel actually helps cool off the engine parts a little bit. And, up to a point, you get more power. That point is, depending on a lot of circumstances and exactly who you ask, around the 12.:1 or 13:1 ratio. And we're talking a very little more power, really--probably on the order of a couple of HP in a stock 1.8 motor. When you get much richer than that, the power drops off drastically.
Get rich enough or lean enough, and all sorts of bad things start happening. The mixture can wind up being very hard to light, and the flame front may actually get extinguished in some cases! This will show up as misfires, or just plain not running. Rich mixtures can foul plugs fairly easily and cause buildup on parts in the combustion chamber and the exhaust. Lean mixtures can actually lead to holes burned in pistons, and other heat-related disasters.
Anyway, the point of the above is that just dumping more fuel in is likely to be counterproductive--chances are you will make less power, and get much worse fuel economy and you might even cause other problems which will be $$$ to fix.
The key is to get more air to move through the engine, and then add the little bit more fuel that is needed to match that air. Within limits, your L-jet system is very capable of doing that. Try a real header (not a "collector and muffler" like a Bursch) like the Tangerine Racing Super Header. It's bloody expensive, but it is probably the best single bolt-on HP improvement you can do without trying to figure out a turbocharger setup.
--DD