CHT sensor extension, Curious, does it work? Who uses one? |
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CHT sensor extension, Curious, does it work? Who uses one? |
malcolm2 |
Oct 25 2016, 09:11 AM
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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 |
BeatNavy |
Oct 25 2016, 09:45 AM
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#22
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Certified Professional Scapegoat Group: Members Posts: 2,933 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
It doesn't slow down the engine warming. It slows down the CHT warming, which then signals to the ECU to keep the mixture richer, longer. A cold engine needs a richer mixture. The flip side to this is that the CHT then cools down faster with the engine off. It does this anyway because the heads are different material than the case, so to some degree this happens anyway. The effect is that after starting a warm car, a cool or cooler CHT will cause the ECU to make the mixture a little richer than it should be, resulting in a low idle until things "even out" again.
The spacer probably aggravates that a bit. Again, it does improve cold drivability (I believe, based on my experience). It probably aggravates the issue of warm-start over rich at least a bit. |
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