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Old 03-05-2008, 07:19 PM   #1 (permalink)
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Any one seen these DIY gauges?

The Closed Loop Monitor

http://www.autospeed.com.au/cms/A_17...popularArticle


Air/Fuel Ratio Meter

http://www.autospeed.com.au/cms/A_02...popularArticle

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Old 03-05-2008, 07:28 PM   #2 (permalink)
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I made the closed loop monitor. I had it on my 1996 Tercel (same engine as my Paseo) for a couple months. After hooking up the scangauge I noticed a huge difference in readings. Its possible I had the closed loop monitor tuned wrong, but the two showed vastly different readings.

The air/fuel ratio meter you can buy from autozone or your local parts store for $20. The bought gauge will look better, save you a hassle, and probably cost only a tiny bit more.
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Old 03-05-2008, 08:51 PM   #3 (permalink)
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In regards to FE instrumentation, on a usefulness scale from 0 to 10, considering a scangauge being 10, how would you rate a combination of a/f ratio meter, closed loop monitor and vacuum gauge?
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Old 03-06-2008, 02:17 AM   #4 (permalink)
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interesting.. neat diy finds
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Old 03-06-2008, 02:37 AM   #5 (permalink)
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i would rate a good vacuum gage a 4. a/f and closed loop are interesting but more indicative of system health. if you get into the fuel enrichment part of the map, a/f and loop would let your know but unless you got a way to trim fuel on the fly, can't see where it would help much, still i like to watch the o2 sensor on my DVM, that's just part of the fun. Injector dwell or duty gives you actual instant % of full fuel flow per unit time, as i eluded to in another thread.
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Old 03-06-2008, 03:01 AM   #6 (permalink)
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A/F Ratio

Having installed an A/F ratio meter (with similar LEDs), I can say that's it nearly worthless.

This was on an '03 Evo -- the LEDs would be consistent only in open loop: cold start or full-throttle. The closest use was A/F at full-throttle, full-boost (in those driving situations, a quick glance) to see if a lean situation was apparent (rare if ever).

Otherwise, the meter bounced back and forth under normal operation.
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Old 03-06-2008, 06:01 AM   #7 (permalink)
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RH77 -

Quote:
Originally Posted by RH77 View Post
Having installed an A/F ratio meter (with similar LEDs), I can say that's it nearly worthless.

This was on an '03 Evo -- the LEDs would be consistent only in open loop: cold start or full-throttle. The closest use was A/F at full-throttle, full-boost (in those driving situations, a quick glance) to see if a lean situation was apparent (rare if ever).

Otherwise, the meter bounced back and forth under normal operation.
I have a digital A/F meter that shows me the magic 14.7 number. I got it because I wanted to "see" what an EFIE (02 sensor signal modifier) would do. But, when the EFIE is off, the A/F ratio is pretty much bouncing above and below 14.7, so it's not doing much, just like you said.

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Old 03-06-2008, 06:05 AM   #8 (permalink)
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123 -

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I have this one :

Digital Fuel Mixture Display Kit for Cars
http://www.jaycar.com.au/productView...=&SUBCATID=347
Quote:
Refer: Silicon Chip September and October 2000
This brilliant dashboard mounting unit monitors and displays your car's air-fuel ratio in real time on a three digit display and at the same time on the programmable 10-LED bargraph. Indicates ratios between 11.8 - 20.6 for petrol and 12.7 - 21.5 for propane/LPG. Some features: fully lean and fully rich indication, fast 220ms update time for bargraph, 440ms upgrade time for 3 digit display, 0-1V display for setting up adjustment, dot or bar option for bargraph and auto display dimming for night driving. All this in a compact case measuring only 83 x 54 x 31mm. Leaded petrol engines will soon poison an EGO sensor, so it is recommended that kit be used for tuning purposes only.
It costs more, but I like it because I can "see" a number, so I don't have to interpret "the bouncing lights".

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Old 03-06-2008, 08:11 AM   #9 (permalink)
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Smile

I have a digital A/F meter that shows me the magic 14.7 number. I got it because I wanted to "see" what an EFIE (02 sensor signal modifier) would do. But, when the EFIE is off, the A/F ratio is pretty much bouncing above and below 14.7, so it's not doing much, just like you said.

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How does this EFIE work? What does the circuit look like? I once played around with the O2 voltage by just adding 0.2 of a volt to the signal with a 3v battery and a simple $5 voltage divider circuit and it gave me a mile per gallon or more. Did not check the placebo effect. Newer ECU's are harder to fool.
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Old 03-06-2008, 12:16 PM   #10 (permalink)
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Here's the main problem with the closed loop meter (even the a/f meter)... It reads directly off the sensor... Yes, there will be somewhat of a correlation between the sensor and the ECU's response - but not directly as seen with the SG and closed loop monitor not being in sync.

The ECU decides when it's in closed loop based on sensor data it gets. It's perfectly reasonable to say that there will be moments when the sensor data is just totally bad. So the ECU works within tolerances.

I built autospeed's closed loop monitor too And I get the same results, the SG (which determines closed loop based on what the ECU says) and the monitor (which gets results from a wire tap) don't agree... The loop monitor fluctuates BUT, when the SG says open loop, the monitor generally does too.

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