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Old 02-03-2012, 11:40 AM   #41 (permalink)
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I am seriously thinking about hooking up a quick lashup to my N-18, and N-75 valves on my car. I'll use a couple wires, a couple of LEDs, and a couple resistors. It will be cool to see a visual representation of the duty cycle. I'm doing this in preparation for some future mods to my car in regards to charge pressure control, and EGR modifications.


Any updates on any progress on the MPG front with your EGR delete UFO?

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http://forums.tdiclub.com/showthread...=306799&page=4

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Old 02-03-2012, 11:58 AM   #42 (permalink)
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I'm still just taking data, I'm on my second tank with EGR defeated. When I next fill up, I am going to re-enable it and see if I get a mileage change. At this point any difference may be within the margin of error given varied traffic and weather conditions.

I don't think you will get much visual indication of the N18 and N75 activity, the on-off behavior of those signals is in the 1-5 mS range, perhaps too fast for the eye to detect.
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Old 02-03-2012, 03:07 PM   #43 (permalink)
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Poo, that stinks about the speed. Maybe the total LED brightness will change with varying PWM signal. I've never tried it, so I don't know.
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http://forums.tdiclub.com/showthread...=306799&page=4

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Old 02-03-2012, 03:34 PM   #44 (permalink)
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Quote:
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Poo, that stinks about the speed. Maybe the total LED brightness will change with varying PWM signal. I've never tried it, so I don't know.
The brightness will vary. If you can set the proper resistance, the difference between 1mA average current and 10mA average current is obvious on an LED.

Your typical LED drops 2V, so your resistor will see 12V when the solenoid is energized. Use a value of 1K ohms, and at 90% duty, you will have about 10mA average current, and 10% duty you will have about 1mA.

Install the resistor in series with the LED, and wire the series set across the terminals of the solenoid.
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Old 02-03-2012, 07:06 PM   #45 (permalink)
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So you are removing emissions equipment on your engine to get better mileage ?
That's terrible !

Saving a few dollars while causing more pollution is something large corporations do.

I would hate to see us stoop so low as to join them.
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Old 02-04-2012, 12:40 AM   #46 (permalink)
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The large corporations designed emmissions equipment that give you cleaner exhaust but most of them just happen to require more fuel get burned.

EGR on a diesel that is used to reduce NOx (also reduces fuel milage) could be replaced with water injection and get better fuel milage.
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Old 02-04-2012, 12:45 AM   #47 (permalink)
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So you are removing emissions equipment on your engine to get better mileage ?
That's terrible !

Saving a few dollars while causing more pollution is something large corporations do.

I would hate to see us stoop so low as to join them.
NOx is a secondary pollutant, and requires reaction to hydrocarbons and UV light to actually be pollution. Reality is not as simple as you'd like it to be.
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Old 02-04-2012, 10:49 AM   #48 (permalink)
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Another thing that's worth noting is the NOx is a local pollutant. By that I mean that any effect that is may have is going to be limited to the local area. I you don't live in an area that has NOx issues (primarily smog), you can make the argument that it's doing no significant harm.

On the other hand, removing the NOx emissions control device increases fuel efficiency and therefore reduces CO2 emissions. Unlike NOx emissions, CO2 emissions are of a concern on a global scale, not local.

So, the case can actually be made that you're helping emissions.
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Old 02-04-2012, 10:24 PM   #49 (permalink)
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That is if you believe CO2 is as evil as every one says it is.
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Old 02-04-2012, 10:59 PM   #50 (permalink)
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Quote:
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That is if you believe CO2 is as evil as every one says it is.
Science is not a matter of belief.

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