I'm not confused. I know that the SC, Cobra (93), and Mark VIII all share the same voltage curve. I have verified these meters and electronics are the same. Pro-M lists a chart with the cars and the calibrations. All three are listed as a Cobra 24. Thus in stock meters they all share the same voltage curve. Pro-M has taken the application chart off their web site but after talking to them today they said it will be put back up in a week. So I ask that you believe me when I refer to the three all having the same voltage curves.
Back to my origional comment about the C&L meters being off. The chart above shows the stock meter vs the C&L. 2% off is acceptable but not 5-15%. What C&L tells me and others is wrong about there meters having the same voltage curves as the stock meter. The Pro-M flow data proves this! The information the meter sends back to the EEC is one of three factors that calculate engine load. MAF Voltage, Engine Displacement, & injector value. I won't go farther into the workings of the EEC right now.
The chart above does show data from a Pro-M meter and a C&L meter. Below is the MAF table from the EEC Tuner for a stock Cobra (93). Voltage numbers are not exactly the same but you will be able to see the KG/HR vs Voltage difference between all three.
I selected two points to compare. Do the math and you will see the % difference between them. Higher the kg/hr number to the stock the richer the A/F ratio will be at that voltage. Lower the kg/hr number to the stock the leaner the A/F ratio will be at that voltage. The Pro-M is not 100% correct but much closer to stock than the C&L is. You can run either meter but I just wanted to point out the difference in flow between the "stock" calibrated aftermarket meters. The advantage to the Pro-M over the C&L is the actual flow sheet that comes with every meter. The way you adjust for a meter that is a mismatch is you adjust the A/F table richer or leaner at a specific load and RPM.
Stock
3.5v 477 kg/hr
2.7v 248 kg/hr
C&L
3.5v 562 kg/hr
2.7v 296 kg/hr
Pro-M
3.5v 488 kg/hr
2.7v 262 kg/hr
Stock 93 Cobra MAF transfer table.
MAF_FUNCTION # Mass Air Transfer Function (Volts, Kg/Hr)
( 15.9998, 869.728 ) ( 4.45386, 869.728 ) ( 4.1001, 709.406 )
( 3.8999, 626.394 ) ( 3.69995, 549.402 ) ( 3.5, 477.796 )
( 3.30005, 411.893 ) ( 3.1001, 351.693 ) ( 2.9021, 296.88 )
( 2.70581, 248.086 ) ( 2.41089, 185.352 ) ( 2.31372, 166.975 )
( 2.21558, 150.182 ) ( 2.11865, 134.657 ) ( 2.01978, 120.399 )
( 1.92139, 107.726 ) ( 1.81909, 95.6859 ) ( 1.71826, 84.9133 )
( 1.61719, 75.0912 ) ( 1.5166, 65.9029 ) ( 1.41772, 57.9818 )
( 1.31738, 50.3777 ) ( 1.21582, 43.724 ) ( 1.11401, 37.3872 )
( 0.912842, 26.9315 ) ( 0.70874, 18.3768 ) ( 0.605469, 14.5747 )
( 0.499268, 11.4063 ) ( 0, 11.4063 ) ( 0, 11.4063 )