O2 and MSI/MSII Question

[cygnusx1]

I am about to order an MS for my car. I am a little unclear as to how the MS uses the O2 sensor and IF I should buy the 5-wire wideband O2 sensor with the MS Kit.

 

I have a standard 1-wire O2 sensor in my downpipe right now but can I replace that with the 5-wire wideband O2 sensor and use that sensor to run MSI or MSII and also use that sensor for tuning.

 

In other words. Will a single WB O2 sensor run MS and still give me a readout to a dash gauge that I can use for tuning in real time?

 

I would like to run closed loop eventually with a WB and use the realtime A/F corrections feature of MS.

 

Sorry if I asked any dumb questions....I am a mechanical engineer...wires scare me a little....just a little.

 

Thanks,

Dave

[twoeightythreez]

MS can use any type of O2 sensor. You can use your narrow band sensor, just enable "narrow band" in megatune and it will adjust cruise mixture to stoich.

You can also piggyback off of that o2 sensor to run a gauge if you wish.

IF you're going WB soon I would recommend not getting a gauge yet, as the WB gauges are different. (you can make a narrow band gauge work with an LC-1 but it's still not as accurate...not as much voltage range...0-1 for NB and 0-5 for WB)

You can adjust how much authority the O2 input has on your fuel map, too. Once you get the MS and read up on the Megamanual (you can DL this free, bowling and grippo figure [correctly] thier software is useless without a MS kit, and they're nice people, plus it would cost you more to make all the components yourself...etc)

you'll see just how much a MS unit can do.

[Matt Cramer]

While a wide band oxygen sensor will give you more data, and I wouldn't want to tune a turbo car without one, Megasquirt can certainly use a narrow band sensor. It was originally designed to work with one, before inexpensive wideband systems hit the market.

 

If you go with a wideband sensor, you will also need a controller, like an LC-1 or an AEM controller.

[cygnusx1]

Trust me I have been reading these forums, the MS manuals, and other forums about megasquirt. I read the same stuff over and over again until it starts to make sense. I think I now have it all figured out.

 

So if I do run the MSII off a wideband, I can allow the O2 sensor to tweak my fuel maps (at my discretion) to maintain a preset A/F ratio map. Then I can also use that O2 sensor through the MSII to display A/F on the dashboard with either a wideband reader or the MegaView-II mounted in the dash.

 

This is all really awesome! I hope it works.

[Matt Cramer]

Yes to both - the wideband can be used for automatic tuning and for displaying the AFR through MegaView. For using a gauge, you'll either use a programmed analog output or a digital output (for the Innovate XD-16) from the wideband controller instead of hooking it up to the Megasquirt.