The Bison JR LLC Air/Fuel Ratio (AFR) Monitor system is very compact and lightweight. The AFR Monitor uses 3 function LEDS that provide five levels of rich / lean condition indication.
The LED display module is a real time display that changes instantaneously as the exhaust oxygen changes based on the dynamics of the Intake air / fuel delivery system characteristics. To aid tuning a latch switch button has been incorporated that allows the operator to freeze or latch the display by depressing the switch button once. The display will not change until the switch button is depressed again, returning the unit to normal function. This feature is very useful and a safety feature to the operator/ driver. The unit operates on typical 12V DC voltage. However, numerous racecar applications do not use batteries, so the AFR Monitor unit is equipped with a 9V battery box power supply.
The AFM can be purchased also as a dual unit, which is a single display (as shown) but utilizes a different wiring harness which incorporates two O2 sensors (ideal for vee engines) and a toggle switch which allows viewing the output of either sensor.
I also offer a twin unit, which features two LED displays & 2 O2 sensors so as to view two sensors simultaneously. For more info & pricing on either of these units please contact me.
We have been marketing these AFM units for 20+ years with a proven track record. They are ideal for tuning multicarb intake systems. They are great for tuning Weber carbs. One drag customer lowered his ET by .3 sec in the 1/8 mile after using the Bison JR AFM.
This AFR unit will also work with E85 and methanol
The monitor displays the output of an ordinary O2 sensor. All required parts and complete instructions are included to provide functionality, except 9V battery. If you have added questions please call 309-346-3322.
NOTE:
AFR wide band O2 sensor misconception!
The latest automotive fuel system technology utilizes wide band AFR sensors for a variety of reasons, none of which is to supply optimal power. Yet, many hot rodders are jumping on the band wagon, dismissing lower tech, much cheaper technology, namely standard O2 sensors. The concern is that the wide band technology is used in current production EFI cars, so why not use advanced technology?
Keep in mind, your carbureted or mechanical fuel injected performance engine wants to run at 14.7:1 air-fuel ratio on gasoline. The above mentioned fuel systems are not typically capable of maintaining a fixed AFR throughout the operating range of the engine. Often to compensate, mechanical systems are tuned rich in acceleration (just to keep the engine from going lean and slightly lean is acceptable at max power.
Corolery Examples:
Lets consider engine Air/Fuel Ratio and human body temperature as desired parameters. You know that your engine AFR should be near 14.7:1 on gasoline and your body temperature is supposed to be 98.6F. Generally, you take your temperature when you don't feel well, and expect you might have a fever. But generally no more than a few degrees. Less than 90F or more than 106F for very long and you will be dead. So what point is there in buying a broader scale, more expensive thermometer that will read, say 0F to 300F? to measure your body temperature? Pointless and a waste of money.
And so it is with your engine's AFR. Why use a sensor that has an operating range that your engine doesn't run in? Black smoke tells you that it is rich, stumble and no acceleration indicates the engine is lean, you don't need a wide band system to tell you that. You shouldn't care that the wide band system might be capable of indicating 17:1 AFR, your engine will NOT like it.
The Enginuity/Bison AF Monitor operates in THE range where your engine should. 3 LEDs provide 5 possible AFR levels. Red LED only, is too lean; Yellow LED only is too rich. The Green LED indicates the proper AFR. Red & Green LEDs together is a slightly lean AFR and Yellow & Green LEDs together is a slightly rich AFR.
The latch feature locks up the display til it is convenient to look at.
C&S Specialities has been marketing our AFR monitor for nearly 30 years now, selling hundreds.