Lean Burn Indicator
 

I'm looking for instructions on the cleanest, cheapest, easiest way to install a little lean-burn indicator LED on a Civic VX.

Here's some threads on Gassavers where this topic was addressed.

VX lean burn monitor - enhanced how to desired - GasSavers.org - Helping You Save at the Pump Hypermiling and Fuel Efficiency Forum
Civic VX Lean Burn monitor - GasSavers.org - Helping You Save at the Pump Hypermiling and Fuel Efficiency Forum
Hello from across the pond! - GasSavers.org - Helping You Save at the Pump Hypermiling and Fuel Efficiency Forum

Thanks, but I've read them all. There needs to be something that can plug into the port under the dash and just light up a LED when it is in lean burn mode. It needs to be that simple. I think it can be that simple but for some reason no one has made one specifically for the VX.

How old is the VX? How many would they sell?

Monitor the O2 voltage with an Ultra Gage, or android torque, or this

http://us1.webpublications.com.au/st...110625_7lo.jpg

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When O2 votage drops to its lowest point, leanburn is upon you

Ultra Gage:
A 95 VX isn't on their supported vehicles list AND there is no way to tell if o2 sensor voltage will even be displayed even if they supported the vehicle.

Android torque:
I don't like how bad smart phones are at pretending to be computers so I don't own one. Android torque is overkill when all I want is a lean burn indicator.

Automotive Voltage monitor:
I've read that too. The problem is that it is too generalized. Too much customization is needed. I need step by step instructions specifically for the VX or a kit made specifically for the VX.

Hook up a $35 vacuum gauge to your intake tubing and mount in a convenient spot on the A-pillar. My experience shows 6in Hg vacuum or greater vacuum will permit lean burn. Anything slightly less vacuum than 6in Hg will knock the car out of lean burn. The vac gauge also makes it easy to drive with constant load, key to upping the mpg's. I like the gauge as you can see how close you are getting to dropping out of lean burn, vs a light or mpg readout...

Alternatively the MPGuino (like a $55 donation) shows instantaneous mpg's, easy to see when the car goes to lean burn when it jumps from 44 mpg to 56mpg cruising (but some wiring involved). Each very useful on its own - getting the pair is outright awesome.

I noticed you mentioned the vacuum gauge on another thread. Looks like the best option so far.

I'm skeptical of the MPGuino's accuracy. How can you be sure that it is accurate?

I would definitely recommend the vac gauge, great learning tool, and as your foot gets better fine control it really helps dial in the mpg sweet spot.

The MPGuino just gets a pulse signal from your vehicle speed sensor (on the transmission) and a 2nd signal from one of the fuel injector leads. It's just counting injector pulses (and duration of each pulse) vs. the speed sensor pulses (miles/gallon). You take a long trip and compare starting and ending highway mile markers and compare to MPGuino's calculated distance by counting pulses. MPGuino has factors that it applies (x pulses/mile and x microseconds/gallon). If MPGuino's distance doesnt match the hwy markers, adjust the factor by the percent error. Same for MPGuino gallons used (once you fill up tank you'll know exactly how much you really used). Brilliantly simple technology that can be adjusted to match any car with any tires/transmission/engine combo. After averaging a few tanks (different gas pumps stop at different points, etc), the MPGuino will be pretty much dead-on. I was filling up at a particular pump at the same station every week for months - MPGuino was never more than like 1mpg off.

I agree - a carefully calibrated MPGuino is extremely accurate.

Look at the notes in my recent fuel log entries. Generally I pump 8-9 gallons, and the Guino generally is accurate within about 0.1 gallon or less. I scroll to the tank data panel, and read the gallons it's recorded for that tank, before I fill.

Your Civic is the generation before mine but if you're up to crimping wires, and I also recommend soldering a couple connections, I can give you installation pointers after you get your 'Guino. I'm pretty sure the wires you need to tap into are in the same place as on my car. You also need to make a case or housing for the 'Guino because it does not come with one, unless that has changed since I got mine.

Step by step:
1. Buy 1 each of the below Multimeters for $3 on sale at Harbour Freight.
2. Connect to O2 sensor output.
3. Set to DC volts.
4. Start car, when meter reads lowest point...leanburn.

Good luck on the VX kit.

http://img253.imageshack.us/img253/6...mm90899mn6.gif

Which indicator is the most correct? The o2 voltage or the vacuum?

most correct? the MPGuino, the DVOM will only let you know what lambda your at, the vacuum gauge, how much load you have on the engine.

Vacuum gauge: help you teach you and your foot to drive more economically
DVOM: Tells you when your in lean burn, and open loop ONLY

with their powers combined you will have the tools you need to drive better, but you wont have measurable data until you get to the gas pump, and you rely on your odometer (which is much less accurate than a calibrated MPGuino) With a MPGuino you will be able to find what speeds your most efficient at.

I have yet to see mechanical odometer closer than 2% error.

IMO the DVOM is not worth installing, and the vacuum gauge is questionable in its usefulness once you have a MPGuino.

Nobody on this forum with argue, a MPGuino, scangauge, or ultragauge will pay for itself.

a little late:turtle:,
but on the p2j ecu's, I'm pretty sure pin A30 was the switched ground for the lean burn indicator (econo light).

This is a switched ground, meaning you need to bring 12v power (prefferably on with the ignition, off otherwise) to one side of your indicator light, and run the ground wire to pin A30 on the p2j ecu.

I made mine in my 96 civic lx with a d15b 3 stage vtec and lx manual tranny and a p2j-j62ecu

80mph/3200rpm is about the highest speed/rpm I can run in lean burn mode!!