If you do have a MAF sensor, the results should be well over 100% because the whole point is to cram more air into the cylinder than it can hold at atmospheric pressure. ṁ = Mass flow rate. engine air flow rate - cubic feet per minute: CID = engine displacement, size or volume - cubic inches: RPM = engine speed - revolutions per minute: NOC = number of cylinders: BORE = length: STROKE = length: HGV = head gasket volume: HGCT = head gasket compressed thickness: PDV = piston deck volume: DPD = deck to piston distance: VPD = volume . This formula works very well in a modern automobile because the: engine computer spends almost 100% of its time managing the Found inside – Page 4-14The reference signal is used to calculate the engine rpm and crankshaft position by the ECM . ... A scan tool will display air flow in terms of grams of air per second ( gm / sec ) , with a range from 3gm / sec to 150 gm / sec . Pound per year The book will help new students develop diagnostic skills and help experienced technicians improve even further. This new edition is fully updated to the latest technological developments. For contemporary naturally-aspirated, two-valve-per-cylinder, pushrod-engine technology, a VE over 95% is excellent, and 100% is achievable, but . Ton per hour (t/h) The chart below shows how to use test results as part of a larger diagnostic ideology. Milligram per hour (mg/h) He set Windmill to route the readings to Excel which performed the necessary calculations and showed the current fuel-consumption. Found inside – Page 207From these results it can be calculated that 3.53 grams per hour of hydrogen ... The MAF conversion was materially less than had been seen in some of the ... The MASS of ingested air is directly proportional to (a) the air density and (b) the volumetric efficiency. Symbols. Kilogram per second (kg/s) A problem with the mass air flow sensor often causes the "check engine" or "service engine soon" light in the vehicle instrument panel to illuminate. On the other hand, a 4-valve Hyundai with variable valve timing and intake tuning should get to 95%. The Control Module converts the MAF signal frequency into a grams per second value. Ounce per year Found insideUtilizing a "strategy-based diagnostics" approach, this book helps students master technical trouble-shooting in order to address the problem correctly on the first attempt. Gram per year Type the value you are converting next to the unit. Therefore an 80% result on a 5.3L Yukon V8 is a pass, but on a 2.4L Sonata it’s a fail. Consider the engine design (e.g. As inlet air flows across and cools the grid, the MAF sensor increases current flow to the grid in order to maintain a constant grid temperature. To Illustrate my point, the aforementioned 2.0 liter Ford (used in the last article) should flow about 4 grams per second at idle. (adsbygoogle = window.adsbygoogle || []).push({}); Type the number of Gram per second (g/s) you want to convert in the text box, to see the results in the table. MAF-Based Fuel MPG Calculator. Some ­aftermarket trainers have also suggested that the GPS number on a good MAF will equal the engine's displacement in liters at idle speed. A new MAF sensor will correct this fuel trim issue. I would say the most common one used today is what is known as, the "hot-wire . The MAF sensor convents the grid current flow into a frequency signal. Pound per minute (lb/min) So to account for the altitude, you should multiply your expected mass flow by 0.83.   The other way around, how many grams (mass) per second - g/sec are in one pound (mass) per second - lb/sec unit? In other words, 3 GPS at idle would be correct on a 3L engine. But, if we were to idle a 6.0 liter engine, we are now expecting just over 6 grams per second. Per second Milligram per second (mg/s) Gram per second (g/s) Kilogram per second (kg/s) Ton per second (t/s) Ounce per second Pound per second (lb/s) Short ton per second Long ton per . Dividing the flowrate of the MAF by the number of intake cycles gives the cylinder airmass. Gram per second (g/s - Per second), mass flow rate. Results in a calculated 100.28 grams per minute through our theoretical MAF. A bad mass air flow sensor is often the likely culprit if your car isn't running as it should. Pound per hour (lb/h) Per year Found inside – Page 1-11... flow of air entering the Throttle Position Sensor ( TPS ) Throttle Position ( TP ) Sensor engine in grams per second . ... ( MAF ) signal should remain relatively constant at cruise , gradually changing with throttle angle and rapidly ... Found inside – Page 68CONVERSION TABLES ( U. S. and Metric ) VOLUME Voit Liters U.S. Gallons Cubic Feet Cubic Meters Acre - Feet 1 ... Feet per year ( maf / yr ) 619,960 1,381 892.9 39.1 1.0 1 liter per second - 15.85 gallons per minute 1 Cubic Foot per ... Found inside – Page 15... the mass airflow rate (MAF) in grams per second and the air-to-fuel ratio. Equation 3.2 is used to convert these data to instantaneous fuel consumption ... Convert between Different Units of Measurement. The ECM compares the actual MAF sensor voltage signal to the predicted MAF value. Found inside – Page 1-11... SENSING Mass Airflow ( 3.3L & 3.8L ) - Sensor measures flow of air entering the engine in grams per second . ... Mass Airflow ( MAF ) signal should remain relatively constant at cruise , gradually changing with throttle angle and ... Short ton per day   Short ton per year Knowing the total fuel consumed and the distance traveled, the fuel consumption rate in MPG (miles per gallon) then can be calculated. Really. The job of the mass air flow sensor . Kilogram per second (kg/s) If a Mass Airflow Meter (MAF) is fitted, the airflow is measured directly by the MAF and converted to airmass (g/cyl) using RPM and the number of cylinders in the engine. Possible causes include: A failed MAF sensor (including the MAF connector and related circuits), Debris-based turbulence upstream of the MAF sensor, A leak in the intake duct between the MAF sensor and throttle plate. Note that non-turbo engines with very clever engine and intake designs may exceed 100%. Move on to Fuel Trim testing because it’s the next easiest fault category. 39 0 obj <>stream I had .373lbs/min when I had the TB gasket on wrong and it still idled at 700rpm. Long ton per year In physics and engineering, mass flow rate is the mass of a substance which passes through a given surface per unit of time. Now the MAF in an explorer may or may not have an IAT (Intake air temp sensor) integrated into it. 1 lbm/min ≈ 0.007 559 872 833 kg/s. If MAF was bad to run 18% lean you MAF would have to be in the 3.4-5.0 range (18% less than normal). Very few engines will even run if the actual breathing is under 55%. Low VE is a simple indicator of a whole category of breathing faults. ��E|�q�����y���od�lKfo9~���,@�W�j����>�U\�n�2��kP�f��[�1�$���hC�Mt�bzx|9\݂�>�V`�y'��Tw6���9�e�o9���vV�ڊLkT_@���忳@��g����'� ˖MA 5 decimals Found inside – Page 393If the MAF sensor is suspected of problems, try turning the key off and ... The MAF sensor converts the incoming airflow to grams per second (gps) or a ... Diferent flow by mass units conversion from pound (mass) per hour to grams (mass) per second. Now find the unit you want and get the conversion result next to it. This translates to 23.59607592165 lb/min or 178.3833333334 g/s. Cold Air Intake Horsepower and Torque increases are dyno tested and proven. Located in the intake air stream, between the air cleaner and before the throttle body, the mass air flow sensor determines air volume as it enters a fuel injected engine. Ok guys, Using Group 2 - field 3 in the measuring blocks in VCDS (Mass Air Flow Sensor (G70))in g/s Not to get too technical, but our cars give a MAF reading in grams per second of air flowing through the intake and as a rule of thumb you can calculate bhp from this reading using either of the fo. Values are given to seven significant figures ( the odd result may show 9's or 0's over running). Your value gets instantly converted to all other units on the page. Click the Convert button. Capture the movie or screen on the Scan Tool and return to the shop to enter the peak RPM and MAF values into the VE calculator along with intake air temperature, altitude, and engine displacement. There is a remarkable similarity in shape between an engine's VE curve and its torque curve. I purchased a 3"-3.5" coupling. Milligram per day Gram per minute (g/min) Possible causes include: Restricted intake (including faulty variable induction), Incorrect camshaft timing (mechanical VVT control). Enter the rate of volume that will pass in a unit period of time. Found inside – Page 14The decision to convert to the Standard International Metric System in New Zealand was made in 1969 and ... Miles per hour ( mph ) Kilometres per hour ( km / h ) Feet per second ( ft per sec ) Metres per second ( m / s ) Volume ... Milligram per minute (mg/min) Rather, you eliminated a whole category of faults, preventing you from wasting time testing for faults that cannot be the root cause. Milligram per second (mg/s) Some ­aftermarket trainers have also suggested that the GPS number on a good MAF will equal the engine's displacement in liters at idle speed. If the ambient pressure gets low (high altitude) don't let the MAF get quite as high. Milligram per day Pound per hour (lb/h) It becomes more like 1 gram per second per liter instead of double. (Sample from 2009 Ford Focus 2.0L) The control module converts the MAF signal frequency into a grams per second value. Those figures sound more like a grams per cylinder value, grams per second should be up around 300. 17 0 obj <> endobj RPM is as well but we need it in revolutions per second to work with the grams per second term so we multiple by 1/60. If not. With the VE tables, you have to multiply the cylinder volume by the VE. Identify the potential general category of concern. The Escan scan tool by ATS automatically does this VE calculation for you as seen in Figure 4. It was just a little too big. You can also go to the universal conversion page. Ounce per minute Kwiatkowski used this information to convert the Mass Air Flow to gallons per hour and then calculate miles per gallon. 0 decimals A larger 5.0L V8 would read around 5 grams per second, and a smaller 2.0L four cylinder would read around 2 grams per second at idle. Found insideIn an injection system, particularly designs that rely on mass air flow ... The MAF sensor converts the incoming airflow to grams per second (gps) or a ... Çàïðîøåííûé ìàòåðèàë íå íàéäåí. Gram per day Technician A says that the sensor should show over 100 grams per second on a scan tool display when the accelerator is depressed to WOT on a running engine. The peak MAF reading should exceed forty times the engine's displacement. At any given moment while the engine is operating, ECM programming expects to see MAF sensors readings, usually grams per second (g/s) within a specific range. Most may be found by testing the ignition system, graphing Fuel Trim PIDs, and performing a VE calculation. Per year At idle, it should read between 4gm/s - 7gm/s on a fully warmed up engine. The ECM will calculate a predicted MAF value. Found inside – Page 9Vanadium hydride containing 8.22 % titanium could contain about 430 ml ( N.T.P ) hydrogen per gram metal , but the hydride had lower dissociation pressure ...