Just a quick question to see if im correct in assuming this will work,
Im wanting to connect a Borg Warner turbo speed sensor up to my logger, via a USM
In the big .pdf file for my Borg Warner turbo it lists the specs for the speed sensor but mentions using a 'converter box', from what i can tell this just converts from the sensors square wave to a normal 0-5V analog signal that most ECUs/loggers will take, however i think the USM can take the square wave, and i wont require the 'converter box'Some specs of the turbo speed sensor are;
The speed sensor is powered by a +5V supply, and the return signal is a variable frequency square wave that has maximum amplitude of 5V and has a 50% duty cycle. The frequency of this signal depends on the speed of the wheel. Each passing blade creates a pulse, and all the EFR wheels have 14 blades except for the 67mm (which has 12 blades). The sensor embedded electronics divides the blade-pass frequency by 8, and then the resulting count forms the output waveform. Here is an example:Info on the 'converter box' is here http://www.roadragegages.com/tss.htm Questions:
100,000 rpm * 14 blades/rev = 1,400,000 blade pass counts per minute
1,400,000 / 60 sec/min = 23,333 blade pass counts per second (Hz)
23,333 / 8 count divisor = 2,917 Hz output frequency
We are currently working with an electronics manufacturer to make a “converter box” that will convert this frequency output into a variable voltage output. By generating a 0-5V signal that is proportional to compressor wheel speed, we offer the end user the ability to easily log or display turbo speed.
1. Is this easly connected to the USM (any input except the 4th), and dont need the converter
2. I have the 67mm so thats 12 blades, 1 pulse per blade = 12 per revolution, sensor divides by 8, so when programming the input on the USM i put pulses per revolution as 1.5? and prog it as Turbo 1 RPM ect?