This based on the same reasoning used to calculate needed carb CFM. (21.7/14.7=1.476) This is the boost pressure ratio above atmospheric pressure. Calculate psi Swap. 19.7 psi / 14.7 = 1.34 Calculating Actual Air Requirements at Desired Boost. Calculating total pressure boost or total dynamic head. I think with my set up having high compression even with less boost you will have good performance If I can obtain 10 psi of boost, that is a PR of 1.68. Your answer will appear in the psi field. How to Calculate Max Boost. Converting MAP kPa to boost in PSI. From here, the wise builder can use a quicker-spooling, more efficient turbo, a smaller intercooler to enhance boost response and can run his beast on the street with 93 octane fuel. In order to calculate the pressure boost requirement for our example, we need to subtract our previous two values, the required discharge pressure and the minimum inlet pressure (HI). His boost was 12 PSI higher than calculated and understandably so. In our example this is Boost Compression Ratio Calculator: Boost Pressure in PSI : TIP: If the result of your conversion is 0, try increasing the "Decimals". The "a" stands for absolute, the "g" for gauge. Characteristic Stability Index (CSI): It is the measure of the change in distribution of the independent variables over time. The max CFM of the blower, rpm where you want the boost to peak, and the displacement of the motor. VCM Suite 2 allows two solutions to this: Solution 1 Create a user defined PID and insert into the table as follows: Name: Boost Pounds per square inch (or pound-force per square inch) is … It can be used both for testing and performance tracking in a similar way to PSI, the comparison would be the distribution of variables unlike PSI where it is the model scores. The minimum inlet pressure (HI), or the city supply main pressure, is 30 psi: HI= 30 psi. How to convert kPa to psi: Enter a value in the kPa field and click on the "Calculate psi" button. Example: a boost gauge reads 0 psi before it is hooked up. A pressure reading is marked psia or psig. Multiply the boost ratio by the liters/minute obtained for 0 Psi and you get the actual air requirements in Liters/min for the engine at that boost. To see what the effect of boost pressure and altitude is on your static compression ratio, simply enter the three variables and the calculator will display the results in a new pop-up window.This will give you an idea of what happens under boost and also how you should plan your motor for your target altitude whether it is for racing or day to day operation. Hopefully, the stuff above doesn't get too chopped up and disjointed during posting! Boost levels above 12 psi should generally be avoided even with racing fuel on a 9.5:1 motor. Of course, lower compression motors will be able to run more boost, and higher compression motors should run less boost, everything else being equal. Application: All vehicles that reference MAP To allow you to view actual boost pressures above atmospheric pressure you can simply make a custom PID. Converting MAP kPa to boost in PSI. Now, horsepower per pound of boost is up to 17.5, so he only needs 14.2 psi of pressure to get to 500 horsepower. Fig 1 : Population Stability Index Comparisons. My Engine N/A dyno sheet indicates I achieved 526HP @ 4900rpm, so 884 Hp, minus the hp to drive my blower, and other ineffieciency's. (The psi stands for Pounds per Square Inch). The supercharged tuneup calculator on my website will figure the above for you (among other things). 17 psi is the gauge pressure, the absolute pressure at sea level is 14.7 + 19 = 33.7. Calculating max boost depends primarily on three variables. Calculate Boost Compression Ratio: Wallace Racing BACK to Calculators Todays date is 2/9/2021. Hook it up, boost the car, and it reads 17 psi.