I'm running pure speed density, although MS has the ability to run MAF or a blended input of MAP/MAF. Speed density is certainly the preferred choice and I didn't want to risk leaving the MAF sensor in the air filter housing for fear of a potential air flow restriction.

The standard MS build uses a single 2.5Bar MAP sensor. I've modified my board to include 2 MAP sensors - both 4Bar - one sensor is used for initial startup base settings.... the second sensor is used for on-the-fly calculations:

MapDaddy

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As I understand what you are saying, the MS ecu gets an rpm signal, and from that and the VE table, determines the actual air amount pumped in, and based on the afr target table, injects the correct fuel volume to meet that afr target. At 100% VE, the air quantity would be the swept volume of the cylinder, so I would assume your VE table has values ranging from maybe .6 to about 1.2 (the latter for a forced induction engine)?


That's about right as I understand it. I'll have to wait until the VE table tuning is finished before I know the upper/lower limits. VE isn't always what it would appear, though. As an example, in forced induction engines, the upper limit probably never gets above 130% because of exhaust gas in the cylinder filling.

Every engine will have a different VE table. The differences might be slight on similar engines, but I should have realized that when I advanced the cams, the VE tables would need to be modified.

Frank

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