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AFR Gauge Question


ride172
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I have been thinking about getting a wideband AFR gauge in hopes of being able to tell when the Renix computer switches to closed loop mode. My thinking is that there would be a different reading for closed loop and open loop. Also I think it would be a good heads up if there was ever a problem with a sensor giving a faulty reading and making it run rich or lean. Any one try this? Do you fellas think it would do the jobs I am wanting it to?

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Absolutely. I've had an AEM unit installed for a few years now and think it's now probably the gauge I watch most. It clearly shows the closed to open loop transition when the O2 sensor kicks in, and I usually wait till that happens after cold starting before driving off. Just this week I noticed that on WOT it was running a bit lean and pinged a bit on WOT. Checked out the fuel pressure at the rail and it was a little low and so adjusted the fuel pressure regulator up a couple of PSI. Now the A/F Stoich is normal in all conditions and all's well. It's a super tool for monitoring the A/F Stoich ratio right for best power vs. economy, and letting you know that all the sensors are working as they should. Especially on the Renix systems.

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Thanks for the good reply, I'm very encouraged to this now. Do you have a preference for analog or digital. I like the analog look just don't know how accurate the tenths would be. Plus it is quite a bit cheaper. Also, I read on naxja about a guy who had access to a Renix ecu scan tool. He said the Renix o2 sensor had a range of 0-5 v .. It's my understanding that is the same range as the wideband gauge. Can anyone verify this? Or is the Renix o2 0-1v?

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Not sure about the Renix O2 sensor voltage output, mine's a 91 HO. All wide band A/F meters need a 1-5 VDC input to function, so you will need to swap out your narrow band O2 sensor for a wide band O2 sensor to use a wide band A/F meter. But the ECU needs a 0-.5 VDC O2 sensor input, and this signal is provided by an aux output from the wide band interface. That's how I have mine wired up and am pretty sure the Renix system O2 sensor voltage output is the same as the HOs, 0-.5 VDC. Another option is to use a narrow band A/F meter (cheap!) that uses the 0-.5 VDC input from the stock O2 sensor. These also work well and will do indicate everything you want it to, just more difficult to interpret.

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Are talking about an economy gauge? All of those I have seen plug into the obd port and I don't think they would work with Renix. I think an afr gauge wouldn't be a very good economy indicator. But this is based off of reading and not experience. Maybe I'm wrong?

 

 

Edit- just reread the post above, I think you were asking something different..

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pretty much the afr guage just shows you what the motor is doing, hornbroad said it was helpful in power vs economy driving. i was just curiouse as to how helpful it was, as in how much or little throttle was applied to drive and get the best ratio. i don't know what the economy guage your talking about is

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Here is another option: http://www.amazon.com/Innovate-Motorspo ... 337&sr=1-2

 

I have one waiting to be installed on my 5.9L ZJ.

 

I also have the AEM on my '91 3000GT VR-4 and it has worked flawlessly for the last 25K miles or so. I bought it from this vendor for $180.00 many years ago. I see he is still honoring that price. http://www.maximalperformance.com/store ... od_10.html

 

It looks like there is an e-bay vendor selling them for $169 shipped: http://cgi.ebay.com/ebaymotors/AEM-Air- ... ccessories

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