Jul 18, 2014 - 03:12 PM
The FLS is $399 and is used for vacuum test/exhaust pulse testing.
The WPS is priced from $700-up, it gives you 3 pressure transducers and the functionality of the FLS sensor. The WPS is used for vacuum test/exhaust pulse testing and cylinder running tests, cranking compression tests etc. The WPS packages include an assortment of hoses.
The FLS is a piezoelectric sensor that only measures CHANGE in pressure and is only for use in low pressure/ vacuum environments. If you have the FLS connected to a static 5 psi line, the sensor will not output anything since there is no change to measure.
The WPS is a very accurate and very fast transducer, it measures actual pressure and vacuum from +/- 5 psi to 500 psi. If you have the WPS connected to a 40 psi fuel line the WPS will output 40 psi. The WPS has 3 pressure ranges (500, 50 and 5psi) that you can choose from to get most accuracy out of each test you want to complete. It also has a "zoom mode" which essentially AC couples the signal to mimic the FLS, in this “zoom mode” the WPS outputs a signal based off pressure changes instead of just pressure.
For the tailpipe testing:
- Both work the WPS and FLS will work.
- The FLS is recommended for this test.
- The WPS “zoom mode” mimics the FLS, but the FLS is a bit superior on this test.
For the intake testing:
- The WPS is better for cranking and running vacuum. The WPS will show actual vacuum reading or changes in vacuum/pressure.
- The FLS for cranking only. Remember, it will only show changes in vacuum/pressure.
For In-cylinder testing:
- The WPS for cranking and running. Actual pressure and vacuum waveform. (best incylinder transducer for this test!)
- The FLS cannot be used for in-cylinder testing.
FirstLook: Engine Diagnostic Pulse Sensor (AES# SX-100)
WPS500X Pressure Transducer Kit (AES# pt-PP836)