Checking Lean/Rich fuel mixture?
Thread Starter
Burning Brakes
Joined: Feb 2009
Posts: 780
Likes: 1
From: Shelby NC
Checking Lean/Rich fuel mixture?
On a carb. car w/SB what do I need to use equipment wise to check mixture? Can it be done at the end of the pipes or do you have to install sensors in each pipe up frt--if so what types and what to read them with? Cost of equipment? Thanks for any advice---
Burning Brakes
Joined: Jun 2008
Posts: 1,086
Likes: 1
From: Michigan
There have been lots of threads about fuel/air mixture guages. Summit racing sells them as do others. The LM-2 is very popular. For sure get a wide band unit.
http://www.summitracing.com/search/?...air/fuel&dds=1
Install the O2 sensor anywhere upstream of the cat converters if you have them or anywhere in the exhaust system if you have a cat free car. You can even take a reading at the exhaust tip in a non cat car if you use the special adapter. You don't have to try to put the O2 sensor at the hotest part of the exhaust. It's not necessary as the O2 sensor is a heated type from any 12v switched source. Don't run the car without the sensor properly installed and hooked up electrically or you will ruin it in a very short time.
http://www.summitracing.com/search/?...air/fuel&dds=1
Install the O2 sensor anywhere upstream of the cat converters if you have them or anywhere in the exhaust system if you have a cat free car. You can even take a reading at the exhaust tip in a non cat car if you use the special adapter. You don't have to try to put the O2 sensor at the hotest part of the exhaust. It's not necessary as the O2 sensor is a heated type from any 12v switched source. Don't run the car without the sensor properly installed and hooked up electrically or you will ruin it in a very short time.
Pro
Joined: Sep 2008
Posts: 508
Likes: 1
From: Olive Branch MS
If you want to save some money, here is a unit we do that uses the same electronics as our fuel injection with the same wideband sensor, but uses an electronic gauge you can mount inside. Cool back lites and works great.
http://www.compperformancegroupstore...alogAFGaugeKit
http://www.compperformancegroupstore...alogAFGaugeKit
Thread Starter
Burning Brakes
Joined: Feb 2009
Posts: 780
Likes: 1
From: Shelby NC
Thanks for the help--quiet a spread in prices. My car is a no cat pure dual so all the computer stuff I guess I would or even could use. Just something to tell me what the carb is doing at different times/loads.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
If you want to save some money, here is a unit we do that uses the same electronics as our fuel injection with the same wideband sensor, but uses an electronic gauge you can mount inside. Cool back lites and works great.
http://www.compperformancegroupstore...alogAFGaugeKit
http://www.compperformancegroupstore...alogAFGaugeKit
I understand two for the heater, and two for the sensor output and instrumentation ground.....what is the 5th wire for??
Pro
Joined: Sep 2008
Posts: 508
Likes: 1
From: Olive Branch MS
The unit doesn't just use the sensor and a gauge. There is a molded unit inline that has the microprocessor and control circuitry inside. Wideband sensors don't just output a voltage. They have to be controlled in a closed loop circuit to an exact temperature and then their are 2 sensors inside that develop a signal. It takes the microprocessor to read the signal and calcualate what air fuel ratio the sensor is seeing and to control the sensor's temperature the excact temperature for the air fuel ratio calibration to be accurate. This same circuitry is inside the EZefi and FAST XFI. The 5th wire goes to a calibration resistor inside the connector that is used to offset a sensor's calibrations differences during manufacture. The microprocessor has to read that in to for the calibration. Bosch makes this sensor.
Here is the inline module that connects to the gauge. It is all in the kit. We use these modules to allow people to have 8 channels of O2 on dyno's as well.
Here is the inline module that connects to the gauge. It is all in the kit. We use these modules to allow people to have 8 channels of O2 on dyno's as well.
Last edited by bluzman2004; Mar 3, 2010 at 05:05 PM.
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
So I have the LM-1 and have it in my Vette and look at it all the time. I have the Bosch sensor what else do I need to hook it up to that gauge, I wouldn't mind mounting that gauge somewhere ?
Pro
Joined: Sep 2008
Posts: 508
Likes: 1
From: Olive Branch MS
Motorhead I think you can buy the gauge seperately. With the LM1 I think you can go into your software and put in a calibration for you analog output channel. If you order one and it doesn't come with the calibration spelled out, just PM me and I will get it for you you. I probably have it on my laptop here actually.
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