CO test meter

[Nick Triesch]

Many folks here say to check the CO to make sure the motor is adjusted correctly. My question is where can I find a cheap gas analyzer ? My local Porsche tech says he checks it by feel. If I go to one of our local fancy San Diego shops they will charge $300 for a 5 minute job with their equipment. I would like to buy the equipment.

[walt]

A digital wide band sensor like this would do it. https://www.innovatemotorsports.com/products/mtxl_plus.php

You can also research the push/pull method on the air sensor plate. It's a good way to rough it in and won't cost you a dime.

[Techno Duck]

Any wideband will work. I had one of the original Innovate widebands in my 951 and have a AEM in my 911.

You will need another O2 sensor bung installed. You can also run it with a tailpipe clamp but its not as accurate.

[dhanl82]

I have an additional O2 sensor in my cat bypass connected to my my AEM wideband air fuel gauge installed below the ash tray in my 1982 sc. This gauge is one of the most useful things I have done. It takes the guess work out of tuning and allows me to see fuel ratios from cold start up through wide open throttle.

Dave

[stlrj]

Originally Posted by Nick Triesch

Many folks here say to check the CO to make sure the motor is adjusted correctly. My question is where can I find a cheap gas analyzer ? My local Porsche tech says he checks it by feel. If I go to one of our local fancy San Diego shops they will charge $300 for a 5 minute job with their equipment. I would like to buy the equipment.

You might be better off learning to check it by feel like the pros do since a cheap analyzer would be useless without proper training on how and where to place the probe.

Cheers,

Joe

[Trackrash]

The AEM is the way to go. Around $200. The only thing is you will have to install the O2 sensor in your exhaust system.

[dicklague]

you can convert CO directly to AFR.

Wide band AFR is the way to go.

AIM is popular but not great. I prefer the Daytona-Sensors WEGO IV. Great instrument.

[evan9eleven]

Originally Posted by Trackrash

The AEM is the way to go. Around $200. The only thing is you will have to install the O2 sensor in your exhaust system.

+1 on the AEM meter. Mine replaced an Innovate meter. The AEM has a gentler heating cycle for the O2 sensor then the Innovate, which has a reputation for killing sensors. My first one died after just 300 miles of tuning, replaced with AEM and all is well. Affordable too.

[Nick Triesch]

Are the readings really that much different before the cat and at the tailpipe? My Porsche mechanic seems to not think so. He told me the best way to check it is with a California smog tester . What do you think ?

[930cabman]

-1 with the Innovate unit. I purchased one several years ago and hasn't been utilized once. Waay to complicated, I have resorted to pulling the spark plugs. I like the idea of knowing your A/F ratio, maybe an AEM unit is in my future.

[Trackrash]

Originally Posted by Nick Triesch

Are the readings really that much different before the cat and at the tailpipe? My Porsche mechanic seems to not think so. He told me the best way to check it is with a California smog tester . What do you think ?

If your cat is working there will be a difference. Just ask all those Carrera owners that had to replace their cat to pass smog.

If you are trying to tune your motor, measure before the cat.

[djdsc]

Find an old used LM1 with tail pipe sniffer. Accurate and inexpensive. Heck, even my old Heathkit is 100% accurate to my LM1 and it converts AFR to CO right on the scale. The Heathkit was $25 on CL.

[Crude Rudy]

good investment, I checked, they are not $25 anymore