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#1 |
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Oil temp influence on ecu
Oddball question here. In my 2013 FRS, does the oil temperature have any influence on engine /ecu operating parameters? I want to remove it.
I'm putting the timing cover back on my engine and have noticed the sensor tip protrudes into and partially obstructs the galley. I want to plug that port and zip tie the sensor in an out of the way place while leaving it plugged in to the wiring harness. I have an aftermarket gauge at my sandwich plate (I know, not the best place) so I'm not worried about what the oem sensor is doing unless it talks to the ecu. |
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#2 | |
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The engine oil temperature, and adjusted values derived from it, are referred to in at least forty different ECU functions; primarily in the variable valve timing code. |
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#3 | |
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other than vvt, which it was quite clear, when and how is it referred? doesn't seem to reduce timing against oil temp |
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What is the minimum temperature needed? If the probe is touching the block, would it get hot enough?
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(These tables aren't documented in any published K00G defs that I'm aware of, but the values are unchanged in S10C under "Intake Duty Correction AC/BD Adjust A/B"; though it seems my legend of "Coolant Temperature" is incorrect, and needs to read Oil Temperature, oops.) EDIT: I kept looking, because curiosity. This is still not comprehensive. There are ~ten uses of the AVCS oil temp at FFF896AC, which under certain circumstances is sometimes capped at 70C (see 0x4E65C), and another ~twenty uses at FFF8C468 (which is copied from 96AC by 0x90EFC). I found another adjustment table 0xBF148 that's used in 0x931E8, spanning 0.73 to 1.11 from -10C to 140C, centered around (interpolated) 1.0 at ~97C; and another just like it, used in 0x957B0. I'd have to do more study or logging to understand this. There's a comparison threshold defined in the table at 0xBF050 that changes over from word 0x04E2 below 20C to 0x0271 above 21C, which is then used in 0x93674 (and, another just like it in 0x95D06) when trying to decide a certain boolean. And, another threshold table at 0xBEE48 referred to by 0x93A3A with different (below freezing) thresholds. There's some sort of rpm / oiltemp comparison going on in 0x944D4 that is super interesting to me. At first glance, I suspect this code is using the table at 0xBF160 to increase the idle RPM basis as temperatures pass 90C - once at 90-..100+: 382..450 rpm, and then again at 128..130+: 450..890rpm, and finally 130..140+: 890..982rpm. There's a few cases where it cares only if oiltemp is below 50C, referring specifically to the float at 0x10A300 = 42 48 00 00. There's a few cases where an oiltemp table is filled with all the same value. Last edited by callisto; 06-18-2023 at 06:40 PM. Reason: curiosity |
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Car manufacturers will very rarely include sensors that are not necessary for correct operation, the oil temp sensor is there for a reason, there are many unknown tables or functions in he ECU software only a small percentage of functions are known. Be best to keep the oil temp sensor in a working position maybe fit a T fitting so you can keep it and your guage |
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I'd still like to know if there is a minimum temperature for full functionality of the car. |
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still think is all related to vvt , oil temp is fundamental for vvt activation and there are tons of conditions to be met other than that Don t think it affects power, only with ecutek you can reduce power and timing against oil temp as it can get used as a relevant input in custom maps |
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The pan would be ideal. I thought you were trying to work with the OEM harness, but if you're good with making the pan work, that is ideal IMO. |
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I've looked all over the internet try to find an extender but no one makes the 10x1.25 male/female version. |
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