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The gauge needle will obviously respond as directed by the sending unit. What sender are you using? |
vdo 360-028
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Upon a cold start, my idle pressure's pretty high, as one would expect. Once warmed and at idle, the pressure is corresponding low, again as one would anticipate. And when running thru the gears, the needle swings left to right as a function of rpm, just like you'd think it oughta do. So I guess that I am out of possible answers now! Thanks - DM |
running 5w50 i see about 70lbs of cold oil pressure at idle, dropping down to about 10-12psi hot idle. While the gauge does swing as you get on it, its not as instant as one would expect, making it hard to check, especially while tracking. Where did you run your ground? Perhaps I need to upgrade my ground location
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All my wiring and gauge connections are behind where my cup holder was and I used the console metal frame for a good ground. Works fine for me. Your oil temps seem slightly high considering it was cold. I will see maybe 225F with 85-90F air temps, but I do have a 2 qt Accusump. http://986forum.com/forums/uploads02...1523035910.jpg |
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Here are the things I have observed:
Here are a few laps from Sebring about a year ago, at the beginning of the video the oil temp is 205'ish and by the end, the oil pressure is getting close to 240F First lap in video: End of front straight: RPM: 6250'ish Oil temp:205'ish Oil pressure:50 Going down the back straight, 2:21 into video RPM: 6250'ish Oil temp: has now climbed to 220F Oil pressure: 45'ish 2nd and last lap in the video End of front straight: 2:55 in video RPM: 6500'ish Oil temp: 225'ish Oil pressure: 42.5'ish (1/4 of way between 40 and 50) Back straight 5:10 in video RPM: 6000 Oil temp: Almost up to 240F Oil pressure: 40 This was on 5W40 - it is better on 10W50 for me, but it is still the nature of the beast with these engines... How does this compare to how your oil pressure gauge was reading? https://youtu.be/0Od4GJDpvDc <iframe width="560" height="315" src="https://www.youtube.com/embed/0Od4GJDpvDc" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe> Here's another Sebring, Nov 2017, with the gauges visible - you have to maximize the video in HD and squint, but it is there :) This is with 10W50 and it is a "little" better... These laps around around 6-7 seconds faster than the other ones from above :) https://youtu.be/4DTCPJizquo |
hmm. From those videos, my gauge definitely feels like its moving more slowly. If I run it up to rpm quickly in a lower gear, it takes a bit for it to catch up, and that doesn't seem to be the case for you guys.
I followed the instructions to a T (16 gauge wire to sender, 14g ground) and a fused power source. The only thing I didn't do is use a dedicated ground, so I'll have to check on that. I have oil temp on the drivers side, oil pressure on the passengers as I'd assume you guys do also. My car has always run hot and I'm not sure why, but its also a base car with a 3.2, so maybe a bit less cooling capacity. Can someone postulate as to what the unmarked lines on the gauges indicate. The one after 200 seems like 210 to me (what my car runs on the street), then 240? |
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The two that are to the left of the 200F are 170F and 190F. I was expecting a linear progression from the 120F mark to the left past the two evenly spaced ticks on the way to 200F, but they measured out as 170 and 190, then verified with 200 when I got to that level. I have been treating the two on the right as 220F and 240F but when I was street driving with the durametric the time I did the calibrations I never got it hot enough to verify anything over 200F. And the two ticks to the left of 200F are not linear, so who knows :) But if you look at this other VDO gauge that runs off the same sender (and this is an interesting thread as well) https://rennlist.com/forums/996-forum/827720-oil-temp-gauge-using-the-built-in-oil-temp-sensor.html https://www.vdo-gauges.com/instruments-displays-and-clusters/by-series/cockpit/cockpit-300-deg-f-oil-temperature-gauge-use-with-vdo-sender.html The 180 and 220 marks on this cockpit gauge seem to match our VDO Vision Black gauges: The 180 seems to split the two lines that I marked as 170 and 190 -Edit: i just figured out to overlay the graphics, the 180F lines up with the 2nd line that I was calling 190F. The 220 seems to line right up on the line I am calling 220 http://986forum.com/forums/uploads02...1523041922.jpg I have never gotten to the 220F on the street, the only time I get over 200F on regular street driving is if I get jammed up in traffic and not getting good airflow. On the highway it is 200F and below. I also have a 180F low temp thermostat. |
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I used the 996 sender. My gauge operates similarly to the others, almost like a tach. If you used the 996 sender, is it possible you swapped the leads? Not sure if that would make a difference or not, but maybe? |
using a 2 pole vdo sender, same as most everyone. The other pole is an on/off switch, so I don't think thats possible.
I'll take a short video over the weekend. |
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