![]() ![]() ![]() Note that this is a CHEMICAL optimization. Chemically, gasoline works best at 14.7:1 (14.7 parts air to 1 part fuel). Different types of fuel have different ratios that they burn (oxidize) at. Set your carburetor float levels before yo begin! I can’t tell you how many times I have had a customer making jet changes for weeks, only to figure out he had the float set improperly the whole time, and had to re-do everything after he figured it out!īack to tuning, there are 2 different ways to read your wideband gauge.Īir / Fuel (A/F) Method (ie: 14:1, 13:1, 16:1).Ī/F is the ratio of air to fuel, air/fuel, by mass. The carburetor float levels must remain constant so that the main circuits always operate under the same conditions. This is achieved when there is good vaporization of the air / fuel mixture, as well as an ideal ignition advance point (spark at the spark plug). This creates a smooth and efficient engine, which doesn’t hesitate, and doesn’t create too much heat. To get “good combustion”, all need to be within a tight range of operation. Low compression, lean or rich mixture, retarded or overly advanced spark, etc. It is critical that you understand that the wideband reads OXYGEN, not fuel!Īn engine will run pretty easily, even in poor tune. The last very common problem is an ignition problem (ignition miss), which will also show on the wideband as “lean”, as all that O2 goes into the exhaust system. If these happen you have an entire cylinder with low or no compression, which won’t combust, and the unburned O2 makes it’s way to the exhaust (reading lean on the wideband). Another example is a leaky valve (burned valve, poor valve job, or tight valve adjustment causing a leak. Examples are a vacuum leak allowing unmetered air into the engine, running lean. The gauge will also read wrong if you have a mechanical issue with the engine. With a leak present, the exhaust will suck in air, and give the O2 sensor a false lean reading. HOWEVER, the gauge can (WILL) read wrong if you have exhaust leaks before the O2 sensor. Once you know how much oxygen is remaining in the exhaust, from that you can deduce the A/F of the engine. Innovate LM-2 Toolbox Wideband Kit or Innovate MTX-L Dash Gauge Wideband KitĪ Wideband allows you to read the exhaust gasses post-combustion. You will likely get a lot more information the 2nd pass, and even more if you read it a third time! And, as the title of this article suggest, you are also going to need to get a wideband air/fuel (A/F) gauge. I urge you to read this article at least 2x, with at least a few hours in between to reflect upon and digest the content. It is important that you understand the “why” because when you make a change, observing how the engine reacts to the change will tell you if the change was a good one, didn’t matter, or you went the wrong way! This article contains both the “how” and the “why”. ![]() Tuning with a Wideband enables you to seriously dial in your carburetion system. ![]()
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