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Author Topic: KPA to PSI explanation  (Read 1951 times)
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Gsxturbo
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« on: February 24, 2009, 06:59:19 PM »

Ok Kurt brought up a great question on what the KPA represents and how to convert to boost.

To convert KPA to boost first we need to know how its used in MT when you power the MS up if you look at the MAP gauge in MT you will most likely see around 95-98kpa if you live a sea level more if you live below sea level and less if you live above sea level 100kpa would represent absolute seal level or 1 atmosphere is 14.7psi.

So in the secondary fuel table we put 107 as the first cell column what this means is everything below 107kpa will not inject fuel anything over 107kpa will.   7 is the actual kpa number we are worried about in the secondary table as 7 would ruffly represent 1lb of boost.

The formula i use to convert is for every 7kpa that will = 1lb boost ( the actual figure is 6.89kpa to 1lb boost)

Here is a little run down we will round it up to 7 and see what each lb. equals.



7kpa   =  1lb boost    Now remember we need to put this as 107 in the fuel map 100kpa( or 1 atmosphere = 7KPA for 1lb of boost)

14kpa =  2lb boost    and this would need to be 114

21kpa =  3lb boost    121

28kpa =  4lb boost    128

35kpa =  5lb boost    135

42kpa =  6lb boost    142

49kpa =  7lb boost    149

56kpa =   8lb boost   156

63kpa =   9lb boost   163
 
70kpa =  10lb boost   170

77kpa =  11lb boost   177

84kpa =  12lb boost   184

91kpa =  13lb boost   191

98kpa =  14lb boost   198

105kpa = 15lb boost  205  And so on up to 22.5 for the standard map sensor if you have the 4bar you would go up to 44.5

22lbs of boost ( we wont worry about the half pound) would be 22 x 7 = 154 + 100= 254 so 254 would be the top column of the fuel table if you intend on going up in boost  that far.

For the 4 bar we would go 44 x 7 = 308 + 100 = 408 ( 400 is the max we can put in the MT table when set for a 4bar sensor ) since we are rounding up from 6.89 to 7 we have a little over flow.

So for the KPA scale on the side for a 4bar map table it might look like this.




And this is what a 2bar might look like you can make the scale on the side whatever you choose, these are just examples .






The map that i send usually goes to 15lbs so if you decide to go beyond 15lbs let me know and i will work you up a bigger map to start from, but you will still need to tune it to make sure what your AFR's are.



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