ok i have researched like carzy on this and i just want to know a few things!!! im getting a a/f gauge off of a buddy for real cheap and i read that you have to install a o2 sensor now thats not prob. but i went to the auto parts store and they told me i had to wire the o2 sensor to the computer. from what ive read you guys have not done this!! do i have to? and what type of o2 sensor did you use? the bosch one for 17.00? im useing a autometer gauge by the way!!! thnks in advance!!!!!

 

For a air fuel ratio setup everyone seems to recommend going wideband (the route im going to go) now its not cheap, but its vital to good tuning of a car...

A wideband that seems to be widely used is the innovate LC-1, there is a kit for this and its about $399 dollars american for the kit. And I was reading another post saying because of the hot rotary exhaust you need a spacer of some sort as well, its expensive stuff...

 

Just have a 2nd O2 bung welded on the exhaust. As far back as you can, but before the cat.

 

To operate the gauge however you do not need to hook the O2 sensor to a computer...

Also if you want to keep the o2 sensor cooler youd place it further down the exhaust, but remember the o2 sensor needs to be quite warm to actually work properly - so you may have to go heated... I don't see any problem with mounting it at the end of the headers..

 

Yea, I think this is right. I haven't put it into operation yet, but I'm planning on installing an O2 sensor in the exhaust and running it right to the gauge. That's the way I understand the instructions for the gauge I have.

Rich

 

personally, i would go wideband. but if economy is what your after, then just by a universal bosch type o2 sensor along with a bung welded 5 inches before the catalytic converter, and run the wires (or wire) straight to your autometer gauge. and there is no need to hook it up to the computer.

Leo

 

I'm not sure what engine you're running, so I don't know whether this is pertinant, but, I have an Autometer A/F guage on my GSL-SE thats wired directly into the O2 sensor. It was there when I bought the car. It had stock exhaust and I wasn't sure if the O2 sensor was any good because the A/F guage was all over the place. It was cool to look at but it didn't tell you ****! Anyway, I installed a complete RB exhaust along with a new Bosche O2 sensor. The new sensor didn't make a difference. The bung on the RB header is located further away from the exhaust ports than the stock manifold. I need to research it some more to find out whats up with it, but thats for another day.

 

While we are on this subject.
I have the Full StreetPort Exhuast system from RacingBeat and I already have installed the Gauge.
Question is?
Where about on the Header are you all Taping in your Sensor?
Some of the threads say on the Rear Rotor Header Pipe about 14-18 inches away from the Motor and others say to run 2 Sensors and install a switch so you can read either the Front or Rear seperatly.
Open to Suggestions.
Sure would like a Functioning Gauge instead of it there for looks.
Thanks
steve
sgieldon
P.S. No E.F.I. (RB StreetPort Holley).

 

Well Im not sure where I saw it, But somewhere you can get a guage kit that runs 2 sensors and only displays the leanest reading. I think this is the best way to go on a rotary so you can install them at the proper distance away from the motor in a header, not worry about getting an improper reading, not just monitor 1 rotor at a time, or have to worry about switching back and fourth. I seem to think FJO racing electonics was the place that had the kit, but if I run into it again Ill let you know.

 

I just put in a sensor in each header pipe, about 4-5 inches before the collector, and ran it to 2 seperate gauges that I put below my stereo. I figured two gauges, 2 seperate readings, from the 2 rotors would help me tune my dual weber carbs. It does help, no doubt...but I wish I had the spare cash to go wideband. The A/F gauges are really somewhat of a light show.

 

Darkfrost thats actually a good idea about tuning individually for each rotor... I never even thought of that, I might have to consider doing that for my weber.

 

I've got the Rotary Engineering twin carb setup, the weber 36 dcd's, and figured it would make tuning them a bit easier. It helps...but like I said, can't beat the wideband.

 

haven't you learned yet that idiots at autoparts stores don't know ****...

 

http://cgi.ebay.com/ebaymotors/Innov...spagenameZWDVW

That is the wideband unit I want to get in the short future it looks like a nice unit. But I guess with a wideband there is no way to tell if there is a difference in your a/f mixture between your 2 rotors is there?

 

I ran my O2 sensor in the collector of my header,it worked well there and warmed up quickly.
Just for the record,a wideband is really the only way to tune,carb or EFI.It will tell you exactly how rich or lean you really are.Cost is the only catch,although they are getting more affordable.
The regular,cheapo A/F meters will tell you if your rich or lean,but not how much.They use Stoich as a "center" on the gauge,but theres nothing to tell you how rich or lean off stoich you are,only that your on one side or the other of it.Its like having a fuel gauge that tells you when your 1/2 full,but nothing else!
Reading plugs and judging power/driveability will give you a more accurate indication of mixture.The narrow band A/F gauges will give you a little info,but most of the time,its not enough to be of any help when tuning.

 

one last question, won't the a/f mixture in a rotarys exhaust be more rich due to the fact thats the way rotarys run? Or do you change the range at which the A/F mixture is being read at? Im confused lol...

 

The O2 sensor measures oxygen content,so the fact that theres excessive unburned fuel in the exhaust stream wont matter.It doesnt measure HC content,only how much oxygen is left in the exhaust.A rotary requires the same RATIO of air and fuel as any other engine.Most of the leftover fuel that doesnt burn,can never burn in the combustion chamber,mainly because of the internal shape and motion of a rotary.The Renesis mostly solved this with the new port design.It still cant burn all the leftover fuel,but instead of pushing it out and wasting it,the Renesis recycles it into the next combustion cycle.