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11-29-2001, 07:10 PM
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Registered Member
Join Date: May 1999
Posts: 5,246
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Actually a Speed Density car has no idea how fast the intake charge is coming it. It has no ability to measure the quantity of incoming air, just the air density. A speed density car relies on a database of information stored inside the computer as tables for the injection cycle.
A Mass Airflow car uses a MAF Meter to physically measure the volume of air coming into an engine, then refers to a table like SD. As far as a speed density system not being able to handle modifications, that's completely false. That's like saying a MAF car cannot handle larger injectors. They both take tuning. You can tune SD by adding fuel pressure, or larger injectors, or having a custom chip burned, and you can tune the MAF to accept larger injectors by having the MAF recalibrated. There are a couple people on this site in the low low 12's/high 11's with SD. |
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