07-31-2022, 09:07 AM | #1205 | |
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I imagine that having shared grounds throughout the harness pretty much kills any chance of a "patch" harness? |
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07-31-2022, 11:16 AM | #1206 | |
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07-31-2022, 03:32 PM | #1207 |
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Mmm, I think it depends on what is going on and how the harness is put together. This might be a mis-pin on my harness or by design, I'm not sure yet, depends on what KPower says.
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08-01-2022, 08:48 AM | #1208 | |
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They all share the the same ground because thats what Honda does. I noticed this too when I was building my chassis harness and testing the kpower engine harness...Haltech and HPA both say all sensors need dedicated sensor grounds but if you look at the OEM wiring for a acura TSX with a k24 they just ground EVERYTHING to the block, and I believe that is what Kpower followed when they designed their harnesses. And at this point you would have to make your own engine harness to get it the grounds separate.
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08-01-2022, 12:50 PM | #1209 | |
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I've seen logs from 4 cars with this swap so far, 3 of them have the same issue, whereas yours (the fourth) doesn't. The differentiating factor being the harness. I dunno, I will see what KPower says, it is not clear to me why they can't replicate this with their test car.
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08-01-2022, 01:18 PM | #1210 | |
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Well.......I finally got a chance to look at my logs this past weekend at my hill climb event (my laptop was MIA for awhile, just got it back) and I noticed there was some spots where my oil pressure would drop straight down to almost 0 psi at full throttle 7000rpm and quickly jump back up to 72 psi... I'm pretty sure something about that would break the laws of physics if true, so I think i'm also be affected. My Oil temp jump around quite a bit as well but nothing too crazy. EDIT: I forgot it could be possible to have been some slight oil starvation
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08-01-2022, 01:29 PM | #1211 |
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08-01-2022, 01:43 PM | #1212 | |
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In either case, I see shifts in temp up to 30-40f in a second or two in your chart there even at lower temps. The oil starvation thing doesn't seem great though, oof. What are the lat / long gforce, throttle, and brake plots looking like during those dips? e: it appears that Honda do their grounding differently than most newer stuff, including Haltech, which is why this is starting to make a bit more sense. KPower is coming from doing KPro with a harness, which is effectively a Honda ECU.
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08-08-2022, 07:56 PM | #1213 |
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Success, both oil temp and pressure are working as expected now.
TLDR: Move the oil sensor ground to sensor ground instead of normal ground I talked to Gerald and he agreed with my grounding idea, so I made a list of grounds at the junction box, as shown left to right: 1. VTC solenoid / oil sensor 2. Crank position sensor / VTEC solenoid 3. Both cam position sensors 4. Ground ring, back of head 5. Coil 2 6. Coil 4 7. Coil 3 8. Coil 1 9. Ground ring, front of head 10. AC1 pin 44 11. AC1 pin 40 12. AC1 pin 37 I decided the cleanest way would be to add a new sensor ground junction box, so I bought: 1x https://www.corsa-technic.com/item.php?item_id=1697 1x https://www.corsa-technic.com/item.php?item_id=1698 10x https://www.corsa-technic.com/item.php?item_id=1104 10x (bought spares / expansion later) https://www.corsa-technic.com/item.php?item_id=698 1x https://www.corsa-technic.com/item.php?item_id=381 1x https://www.corsa-technic.com/item.php?item_id=291 Depinned ground junction box pin 1, cut off the second wire, pinned the VTC solenoid into the existing junction box, pinned the oil sensor into the new junction box (sensor junction box) Depinned AC1 pin 34, cut one of the wires, pinned it into the new sensor junction box, soldered/heatshrank a new wire from the wire I cut on AC1 to the sensor junction box. Nice thing is the junction boxes clip together to keep everything tidy. I think a cleaner way would be to crimp a new pin for AC1 instead of splicing, but whatever. I also intend to move the cam sensors and crank sensor to my sensor junction box since Haltech expects them to be sensor grounded. This is an improperly working sensor graph (green line, bottom graph) This is what a working sensor graph looks like (green line, bottom graph)
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08-08-2022, 11:52 PM | #1214 |
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I wonder if Kpower will come up with a fix for those of us who already have the harness. They need to make this right. I still can't believe that they didn't catch this on their test mule during R&D.
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08-09-2022, 12:05 AM | #1215 |
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I can. A buddy and I joked about what they touted as thorough testing well before they ever released the kit.
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08-09-2022, 08:45 AM | #1216 | |
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I vaguely comprehend what you have done, but since it appears to be a proper fix I'll probably patch mine up just the same. Highly doubtful that Kpower will issue any "fix" for this as most folks haven't even noticed it was a problem. Of course that's not a reasonable excuse to avoid it either. |
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08-09-2022, 12:48 PM | #1217 |
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Yeah, there were a fair few things missed in testing that should have come up prior, but it is what it is at this point.
This oil temp thing will slip past the majority of people since there is zero window into oil temp unless you either: 1. Plug an AIM Solo 2 DL / dash into the Haltech CAN network and choose to show oil temp 2. Datalog in Haltech and specifically look at oil temp 3. Set up Haltech failsafes based on oil temp and find out they are triggered all the time I still have a few things left to do to shore up some shortcomings: 1. Make a bellhousing cover 2. Have the header completely rewelded with shielding gas or send it to hytech to be re-made when it inevitably cracks 3. Add more flex to the intake pipe to throttle body 4. Have the stock driveshaft shortened All in all, I'm not dissatisfied with the kit but I have some remorse of not just splurging a bit to switch to an Exige when I was weighing doing this all.
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08-09-2022, 08:25 PM | #1218 |
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As I said, I removed the oil temp sensor and repurposed it. I had a failsafe for the oil pressure that I removed because it would trigger a cold on startup, but only then. I have an oil pressure gauge, and I don’t datalog temps or pressures, as the oil pressure is so high compared to the FA20, and I have the JR radiator/oil cooler. I’m not tracking the car at this time. The long term plane is a built engine, CD009 and more power with track time, so maybe when the engine is out I’ll do this to the harness. None of this effects the tune, right? Thanks.
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