stewart battersby Posted June 26, 2007 Report Share Posted June 26, 2007 I have mapped out my ECT and IAt which are both PTC sensors. Loading this data into Link G3 all I get is a reading of max temp when the sensor is at room temp. If the G3 will take any sensor and I do not have an earth fault, what do you reckon is happening? The row graph is smooth and my measurments accurate. Quote Link to comment Share on other sites More sharing options...
ashesman Posted June 26, 2007 Report Share Posted June 26, 2007 Congratulations, you are the first person to try use PTC sensors with a G2/G3. Unfortunately the numbers in the custom temp sensor table must increase with temperature. However it is possible with some clever wiring to trick the ECU into seeing your PTC sensors as NTC sensors. Let me know if you want to go this way, it involves wiring an external resistor to the sensor... Quote Link to comment Share on other sites More sharing options...
stewart battersby Posted June 27, 2007 Author Report Share Posted June 27, 2007 When I was a lad an NTC sensor decreased it's resistance with heat, is this still so in todays terminology, or the reverse? My two sensors do in fact increase with temp, I interpolate from 90' to 150' yet at room temp of 17' the guage reads 150'. Any ideas? Quote Link to comment Share on other sites More sharing options...
ashesman Posted June 27, 2007 Report Share Posted June 27, 2007 Oh shit, sorry, that should say "DECREASE" with temperature. NTC resistance decreases with temperature, PTC increases with temperature. Anyways, it does not help you! Remember not to just interpolate as resistance change with temperature is not linear (ie resistance doesn't double with temperature). Anyways, you cannot use these sensors with the G2/G3 ECU's. For some reason I thought there was a way round it, but there is not... Quote Link to comment Share on other sites More sharing options...
stewart battersby Posted June 28, 2007 Author Report Share Posted June 28, 2007 OK. I have an NTC for coolant now. With the IAT what sort of difference does it make in the overall scheme of things having a rapid response to air temp changes. Quote Link to comment Share on other sites More sharing options...
ashesman Posted June 28, 2007 Report Share Posted June 28, 2007 If you are using forced induction then a rapid response sensor is very important. For N/A motors it isn't really that important. We offer bosch slow and fast response sensors and a delphi fast response sensor. Quote Link to comment Share on other sites More sharing options...
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