![]() Although, the wire that the MAF sensor needs to work will sometimes impede air-flow especially on high-output, high-revving cars. Some MAF-based systems have even shrunk to fit in smaller car models. Note that newer MAF sensors are now more advanced, and they too can handle high RPM engines. A MAF system on the other hand is much larger since it needs a sizable, straight section of pipe to measure mass air-flow.Įven cars like the Ferrari 458's F136 V8 uses MAF sensors Other than that, speed density systems are smaller and are easier to stuff inside a tight engine bay. At the most, the said engine can rev up to 8,250 RPM when equipped with the ECU specific to the six-speed gearbox. The Toyota-made 4age 20-valve series of engines for example comes stock with a speed density system. It’s easier to tune, and this system can handle higher RPMs than “normal” non-high performance MAF sensors. Vehicles like the Suzuki Jimny uses a MAF sensorĪ speed density system on the other hand is more suitable for track cars, drag cars, drift cars, or modified performance cars in general. As such, vehicles equipped with MAF sensors will do better in these conditions. On these kinds of terrain, air density is lower than the normal atmospheric pressure at sea level. Take for example off-road vehicles that are used to climb heights way above sea level. As such, a MAF system is more suitable for vehicles that are used in extreme conditions. While MAF measures air-density, a speed density system does not. This voltage is proportional to the amount of air cooling the wire.Ī MAF sensor for Hyundai models Speed Density vs MAF The wire is also kept at a constant temperature by introducing a specific amount of voltage. In order to do that, the said system uses a heated wire which is actively cooled down by the passing air. This allows it to accurately measure the amount of air passing through. It is located in the air intake, specifically on a straight section of the system. ![]() > Related: Can ECU remapping damage your car's engine? MAFĪs we’ve said, MAF refers to mass airflow. This table allows the car to detect just how much air the engine is taking in. The ECU knows that because it actively refers to a volumetric efficiency table. With these data, the car’s engine control unit (ECU) can then calculate how much fuel it needs. It also keeps track of the temperature of inlet air. Speed density systems work by measuring the pressure inside the manifold through a MAP sensor. So how is speed density vs MAF different from each other? Do these differences matter? Speed Density On modern fuel-injected cars, the more common system used to measure airflow is speed density via a manifold air pressure sensor (MAP) or through a mass airflow sensor (MAF). This will either result in poor performance, poor fuel economy, or both. Without measuring air, the ratio of fuel and air might not be optimal. Just like the Avatar, an engine needs to control several elements to work For the air/fuel mix, the amount of air determines how much power is going to be produced. These elements, however, need to be measured and controlled. The said shaft then rotates your car’s transmission, and then your wheels. This creates a small contained explosion, which pushes down pistons, which in turn turns a crankshaft. If you’re into cars, then you’ll have known that cars need to burn a mix of fuel and air to run. Probably not a bunch of help but a free bump if nothing else. The easiest way would be to capture data directly from the stock MAF and use the calcs in that link above. I calculated up a bunch of other stuff but been interrupted too much this morning and not sure how accurate it is. TAF = 285.87 Ft³ (theoretica air flow from displacement) Some things that might help kickstart your calculations if you don't have them already. I'm sure a dozen other variables that I haven't even come across. ![]() You'd have to take into account pressure drops from IC, turbo efficiency (from a compressor map, incidently I don't know of one for Suby turbos), engine's naturally aspirated VE (probably ~80%), boost pressure, atmospheric pressure, temperatures, IC efficiency etc. To actually calculate it from scratch without the data would require a lot of calculating I believe. I don't yet have scanning software to help determine the actual volumetric flow rate on the Suby yet (use datamaster for my T/A). Click to expand.Hmm, let me just offer this up.
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