01-26-2023, 07:29 PM | #71 | |
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How would one create a controlled environment? I'd hazard a guess that testing on track where you know the exact conditions to your issue exist, with careful monitoring might be the only practical was to test, but interested in your thoughts. |
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01-26-2023, 09:00 PM | #72 | |
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I assume "positive" banking like the oval tracks should slightly improve the oil pressure drops since the gravity will slightly make the oil in the pan more flat, so the pickup is less likely to encounter oil starvation. I could be wrong cuz my calculation uses an ideal square oil pan model and didn't consider oil return flow under high lateral g. |
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01-27-2023, 08:32 AM | #73 | ||
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On the dyno is where it needs to be done. It's a controlled environment. You monitor inlet/outlet pressure and flow. You do pulls and recharge the accumulator at various RPM points and watch what happens. You could test on track if you had the right sensors and feedback solutions in place, but without, you're just speculating on what is happening. |
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01-27-2023, 08:41 AM | #74 | ||
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I don't know (yet) at what levels the stock setup has lateral loading limitations. I can say from our EJ STi experience, the OEM setup is good for ~1.2Gs (track dependant). Our standard performance pan bumps that up to ~1.6Gs, and our Super-G is for anything beyond that. |
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01-27-2023, 09:59 AM | #75 |
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Another member had questions on the backside. Thought it might be relevant to some folks in here too.
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01-27-2023, 12:02 PM | #76 | |
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01-27-2023, 03:56 PM | #77 |
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Has anyone killed an FA24 yet? Or the better question, has anyone killed an FA24 due to oil starvation?
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01-27-2023, 04:10 PM | #78 | |
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/threads/2022-brz-rod-knock-and-positive-subaru-experience.3025/ But I also wondered this as there has to be quite a few people running much higher grip than SX2's. Also, is it confirmed that this issue doesn't exist on the first gen? I know it's a different pickup design... |
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01-27-2023, 05:53 PM | #79 | |
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Also no issue at Auto Club on 200TW tires in the 2nd gen. |
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01-27-2023, 06:48 PM | #80 | |
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You happen to have any data on what sustaned lateral accel is on those banked turns? |
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01-27-2023, 08:33 PM | #81 |
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Local 86cup fb group. Gen1 car with 2015 engine. I don't know the owner so I don't know more details. I guess now you see one example.
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01-27-2023, 10:03 PM | #82 |
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I know someone that believes oil starvation was the cause of death on their FA24. Warranty was denied, they ended up finding a used motor. Running high grip tires. They had FA20 cars prior and never any issues on similar tire setup.
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01-30-2023, 08:32 AM | #83 |
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Always tough to trust second hand or partial info. This is where speculation gets the worst of us.
Is there any comprehensive data logging with any of these failures? Are there any images of the main bearings? Do the rods look over heated or warped from excessive heat, or just damaged? When there IS oil starvation, there are heat tells in the bearings, rod, main, and sometimes even the crank will warp some. Since the mains are fed before the rods and loose oil flow first, starvation almost always leaves a tell on the main bearings. With ONLY rod bearings damaged and no data or heat signatures anywhere, you really need to tear down the entire engine and have some one that knows what they are looking for review to find the failure mode. With solely rod bearing failure, I would more likely suspect rod knock. Mahle has a nice bearing failure guide if anyone wants to dork out on this stuff. |
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01-30-2023, 02:07 PM | #84 |
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Both. I will check with our data engineer to see if we still have that available, as I don't know it off the top of my head.
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