CHT sensor extension, Curious, does it work? Who uses one? |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
CHT sensor extension, Curious, does it work? Who uses one? |
malcolm2 |
Oct 25 2016, 09:11 AM
Post
#1
|
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 |
pbanders |
Oct 28 2016, 06:02 PM
Post
#2
|
Senior Member Group: Members Posts: 939 Joined: 11-June 03 From: Phoenix, AZ Member No.: 805 |
Here's the schematic for using a DPDT switch and a 300 ohm pot to create a circuit that would allow you to put parallel resistance to the CHT, and lower the resistance seen by the ECU, so that the ECU thinks the car is more warmed-up than the CHT is telling it. Flipping the switch to the other position takes the pot out of the circuit and lets the CHT alone control the ECU.
EDIT: might be better to use a 500 ohm pot, they're more readily available, cheaper, and smaller. The current requirements for this application are low. 500 ohm Pot http://www.parts-express.com/500-ohm-poten...-shaft--023-500 DPDT switch http://www.parts-express.com/dpdt-slide-sw...-lever--023-670 Probably the best way to implement this is to run wires from the CHT and the ECU wiring harness to the passenger compartment, then use a small project box to house the pot and the DPDT switch. Note this is STRICTLY ThEORETICAL at this moment, nobody has done this to my knowledge and it may not work. Try at your own risk/gain. |
Lo-Fi Version | Time is now: 26th June 2024 - 05:54 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |