I'm always hearing about adding a wideband oxygen sensor, so I started looking into it. Every site I check says this sensor is not available for a 93 RX7. Also, the installation diagram for the A/F Meter I bought indicates that you tap into the input line for the ECU, but it appears the stock ECU will not accept the output from a WB sensor....how 'bout a Power FC? Will it accept the WB signal or will I just have to use the WB sensor strictly for the meter?

 

The RX-7 did not come with a wideband sensor from the factory, only a narrowband which is useless (for tuning). If you buy a wideband, you just give it power and put the sensor in your exhaust. You cannot hookup the wideband directly to the powerfc as the powerfc is only setup to accept stock signals. You would need to hook it up to a datalogit and then you can log it with a laptop (assuming you want to log it). Some widebands have analog narrowband outputs which you could hook up to the stock computer/powerfc if you'd like to but its useless unless you want to run closed loop during cruise which most people skip all together and just run lean 15-16 AFR's for fuel efficiency.

thewird

 

I did a little more research and here's what I found. The meter I have is an Autometer Carbon Fiber Air Fuel Ratio Gauge #4775. It came as part of a set including a boost gauge and an oil temp gauge. It does not come with a sensor, but the installation instructions direct you to use an Autometer Model 2244 Sensor, which it turns out is a narrowband sensor. Summit Racing says it will work with the stock sensor, but every user comment I found says narrowband is useless for A/F ratio on a rotary. Will it work if I connect it to a wideband sensor? I'd just replace it with a different gauge, but then it won't match the other gauges. Instead I'd probably opt to replace all 3 gauges.

 

If you still have the stock narrowband, you can hook it up to that so you can use your gauge. But other then that its really not usefull, it will just show rich, stoic, and lean but not give you a real A/F ratio. It will not work with a wideband sensor. I would ditch it and get a real wideband.

thewird

 

Well, I've already bought a gauge pod and all the gauges, so I think I'll go ahead and use it until I can afford to replace these gauges with something more appropriate. Thanks for the input.