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Old Nov 11, 2012 | 04:26 AM
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Billy22Bob
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Joined: May 2012
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Default Re: looking for some data on rpm v MAP...

I dont want to step on too many egos here, but ....the interesting thing to note from the chart in the previous post is that the 1st gear pull is probably the most representative of one's actual - present "boost" setup. In this case...20.5psi

Boost does increase in 2nd and 3rd gear pulls - but it isnt really the result of the SC pumping air, more rather it's pumping heat int othe system and the heat is providing the increase in pressure.....

Regardless - boost isnt the end game here - it's density....more density - more cfm, more g/sec more fuel...and hopefully out of all that - more power....
here's another chart of intake density for the same pull.....
It has to be noted - the AIT figures out of the csv file from the zeitronix log were a little coarse....but the MAP and rpm are good - hence the resultant density is a relatively sound calculation.....

Interesting - max density is 1st and 2nd gear upto 50degC (122F)
- 3rd and 4th gear - although the boost gauge is making you feel good (previous graph) density's droping away .....temperature.....
Fortunately in this case - the map is setup to pump more fuel in regardless - maintaining cc/sec and AFR's journey into the low 11's.
 
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