PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

SD vs MAF

Old Jun 5, 2006 | 10:58 AM
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Default SD vs MAF

Hello Guys,

I've heard about Speed Density and don't quite know what it is. My current understanding of MAF is exactly what the name says, it just tells the PCM how much air is being sucked in by the motor correct? Any help with this noob question would be appreciated.
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Old Jun 5, 2006 | 11:01 AM
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maf=maf enabled
SD=maf disabled, fueling relys on VE table primarily.
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Old Jun 5, 2006 | 04:15 PM
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Okay thanks for the reply. I did a little more research and I think I fully grasp this. But from what I understand MAF is the only way to go for optimum performance and fuel economy. In what real world reason would you want to go SD from MAF?
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Old Jun 5, 2006 | 04:27 PM
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The forced induction guys max the MAF out. Mine maxes at 4800 RPM.
Originally Posted by gnomee
In what real world reason would you want to go SD from MAF?
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