AFM Testing Tool for my CIS-Which One?

Eric-325I · 11-16-2006, 09:06 AM

Hello Pelicans:

My baby: '79 SC coupe, 103k, slowly being overhauled (suspension, interior, skin) and back-dated (thanks for the great info Souk), runs very strong and well. Been doing a lot of searches and reading about CIS lately...

Background: I adjusted my throttle down slightly after purchase as it was set a little high (1200rpm or so). She idles at around 900rpm now and is very strong. She runs very well.

Question: Will this cheaper AFM from Pelican (K @ N Air Fuel Monitor ) work? It is one hundred dollars cheaper than the LM-1 found here ? I'm looking for something I can use to monitor AFM and for adjustments if/when needed but don't necessarily need to spend an extra hundred bucks unless it's a no-brainer. I plan to replace my clock with the meter if possible... What do you all think?

Thanks much!

Eric

North Coast Cab · North Coast Cab's Garage

Buy the LM-1
It records 44 minutes of data so you can not only set the mixture at idle, you can record under load. For a few extra bucks you can get the RPM module and get some really useful data.

mmastro · 11-16-2006, 12:24 PM

Where would you install the O2 sensor?

I read for turbo cars, the sensor that comes with the kit is only good to 1300deg. I wonder if they have a sensor that could withstand turbo exhaust temps?

Eric-325I · 11-16-2006, 02:27 PM

Mike:

It appears as though you drill a hole and weld a bolt over it on the headers to install the sensor.

North Coast:

Thanks for the advice, good food for thought.

Eric

Green 912 · 11-16-2006, 04:21 PM

Lm-1 has a sensor bracket that you can clamp to the tail pipe install, tune the car and remove.

Walt Fricke · 11-16-2006, 04:26 PM

You can weld an oxygen sensor bung into an exhaust secondary. You can buy these separately, or you can buy a nut of the proper size and (with or without machining it some to make a proper bung out of it) weld it over the hole you have to make in either case.

But you can also get, along with the LM-1, what you need for an "up the tailpipe" temporary installation. For on the road testing you will end up taping some wires along the outside of the car to get to the brains of the system that you probably want in the cockpit out of harm's way, but not a big deal. On a chassis dyno, even less fuss.

My only turbo temp experience is with my (former) F350, but that sensor is not down at the end of the tailpipe. Since you are looking at mixture, not heat, poking the temporary one up the tailpipe should be a reasonable place for it I would think, and maybe the exhaust has cooled somewhat by then?

Walt Fricke
(who should have purchased a bung rather than running around to friends with lathes to make one from a nut to allow installation of an O2 sensor in his SSI)

oneblueyedog · oneblueyedog's Garage

Here's how I did mine.

cstreit · cstreit's Garage

Does the K&N version record at all or have outputs for my data logger? I was thinking about it too.

MotoSook · 11-17-2006, 06:14 AM

The K&N package does not look like it is a wideband monitor. Get a wideband if you are serious about tuning.

oneblueyedog · oneblueyedog's Garage

It is not a wide band monitor. No logging. It's a meter.

Eric-325I · 11-17-2006, 09:35 AM

Souk has spoken. I will spring for the LM-1. Thanks everyone for the input.

Eric

fireant911 · 11-17-2006, 09:52 AM

I'm sure that the LM-1 is a great tool but isn't it a bit of overkill for everyone except 'the-most-serious-tuner'? I purchased a Westach Air-Fuel monitor a couple of years back and have never had any regrets nor experienced any longings for additional features. Sure it is a narrow-band meter but has certainly served its purpose extremely well. Plus it was around $60, which is considerably cheaper than the LM-1 and the K&N although you will still need the sensor and bung.