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Turbonut
Join Date: Jun 2009
Location: Estonia, Europe
Posts: 1,261
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With ITB's throttle angle is the most precise and fastest engine air requirement parameter. But since density changes with temperature and humidity it needs some compensation.
Factories use MAF because it compensates for small VE changes over engine life due to wear, use of different components etc.
For example when BMW M3 (E46) MAF sensor fails, ECU goes to Alpha-N mode. And M3 CSL (E46) uses Alpha-N from the factory, if it would be so bad they wouldn't have went that route 
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'83 924 (2.6 16v Turbo, 530hp),'67 911 hot-rod /2.4S, '78 924 Carrera GT project (2.0 turbo 340 hp), '84 928 S 4.7 Euro (VEMS PnP, 332 HP), '90 944 S2 Cabriolet
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