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malcolm2 |
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#21
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States ![]() ![]() |
I want to cover all my bases here. I have purchased the new GB CHT sensor from 914Rubber to try.
So, I think I will buy a spacer from Brad Mayeur to have the option. From what he says it should: "Porsche 914/4 Cylinder Head Temperature Sensor Extension. This little device slows down the heating of the sensor and improves warm up drivability." I do have "warm up drivability" problems = Low idle RPM until the VDO CHT hits about 250*F. So it seems like my problems don't need the warm up to slow down, it needs to SPEED UP. (IMG:style_emoticons/default/WTF.gif) 914LTD.com ![]() ![]() Also found on RATWELL (scroll down to WORKAROUNDS)http://www.ratwell.com/technical/TempSensorII.html#parts |
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pbanders |
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#22
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Senior Member ![]() ![]() ![]() Group: Members Posts: 939 Joined: 11-June 03 From: Phoenix, AZ Member No.: 805 ![]() |
OK, I can't stop, here's one more circuit where I've added a test node and an isolation switch, so that you can test either the voltage across the CHT and series/parallel circuit, or by opening the switch, test the resistance to ground. Obviously, when the Isolate switch is opened, the car won't run because the ECU will see an open for the CHT, but you can test the resistance so that you know what the setpoint is. While the car is running, you can watch the voltage and see how it's changing as the temperature changes the resistance of the CHT or you change the adjustments on the pots and DPDT switch. Note I have the CHT at 50 ohms, that's just the approximate resistance of the CHT when the car is fully warmed-up.
![]() SPST Switch http://www.parts-express.com/spst-mini-pad...switch--060-532 Banana Binding Post (red, buy 2: ECU, Test Point) http://www.parts-express.com/binding-post-red--090-485 Banana Binding Post (black, buy 2: CHT, ground) http://www.parts-express.com/parts-express...-black--090-480 Banana Plug (red, buy 2: ECU, Test Point) http://www.parts-express.com/parts-express...ug-red--090-465 Banana Plug (black, buy 2: CHT, ground) http://www.parts-express.com/parts-express...-black--090-460 Project box http://www.parts-express.com/hammond-1591a...97-083--320-702 Pot Knobs https://smile.amazon.com/gp/product/B00NN6M...=UTF8&psc=1 |
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Lo-Fi Version | Time is now: 28th June 2024 - 11:06 PM |
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