Syvecs App Calculations Talk

[Wez]

Hey All,

A new topic dedicated to the discussion of calculations within the App, post your findings on what works best for you, I pull some data across from the other threads to get this going.

FYI The app runs separate from the ECU, the datastream output is always the same unit regardless what unit you display within sCal, you can see this at the top of the datastream frame content window, the calc does not change even you select another unit type.

[Wez]

To convert Lambda to AFR

The current calc for displaying Lambda is shown below as per sCal :-

(x/1000)+0

You could use the following calc to convert into AFR :-

x*0.0147

I have not tested these myself but they should get you pretty close

[Wez]

Pressure Reading Conversions

OK looking at a MAP value the default is in mBar like all pressure readings, the default calc is :-

(1*x)+0 which is basically just x

To convert to PSI one mBar is equal to 0.0145037738, I would round this up to 0.0145 and use the following calc :-

x*0.0145

To convert to BAR use x*0.001

If you want KPA you could use x*0.1

[Wez]

Convert Default Celsius to Fahrenheit

Big thanks to JamesD for this

Just as a quick note, for the conversion you would want to use

Before: (x/10)+0
After: 1.8*(x/10) + 32

for the conversion from Celsius to Fahrenheit as the function has both a slope and offset so TempF = 1.8*TempC + 32.

[Wez]

Speed Unit Conversion - Default KPH

For KPH into MPH, sCal shows vehicleSpeed calc as below and output unit is KPH :-

(0.036*x)+0

According to Google the conversion of KPH into MPH is KPH * 0.621371, therefore you could do (0.036*x)*0.621371 but it looks messy.

You could also do this :-

x/45 which gets you damn close, see below calcs :-

Example 1 x = 1000 (raw value)
(0.036*1000)+0 = 36 KPH
36KPH * 0.621371 = 22MPH
1000 / 45 = 22MPH

Example 2 x = 2300 (raw value)
(0.036*2300)+0 = 83 KPH
83KPH * 0.621371 = 51MPH
2300 / 45 = 51MPH

I would try with the very basic calc of x/45 and see how that looks

Again this is untested but should be OK, let me know how you get on