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Tracking / Autocross / HPDE / Drifting What these cars were built for! |
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11-07-2020, 09:13 AM | #15 |
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11-07-2020, 09:39 AM | #16 |
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11-07-2020, 03:00 PM | #17 | |
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I've lost count of how many novices I've seen spin a bearing or sieze a motor completely due to their oil thinning out, on their first/second/third track day. Well into the double digits. Plus, lower oil temps will lead to better long term wear. I'm sure you've been in the right seat before. How often do you see novices unwittingly hold redline in a lower gear because they're so mentally overloaded? Try holding 7000 rpm in 2nd gear on the highway, while watching your temps. Some folks can get away without an oil cooler, but I definitely prefer to err on the side of caution. |
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11-07-2020, 03:00 PM | #18 |
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11-07-2020, 05:04 PM | #19 |
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Since heat is the nemesis of any engine and oil in the 220-240 range is considered optimal for longevity by most why would you not want to attempt to stay in that range. An oil cooler for the track just seems to be a no brainer common sense wise.
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11-07-2020, 07:15 PM | #20 |
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11-07-2020, 08:44 PM | #21 | |
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What track was this on, how long is each session, and what is ambient temperature on a hot track day? On my previous car, I'd change the oil every 3,000mi/5,000km (5-6 track days). Would this be considered frequent enough for the BRZ? Last edited by SCFD; 11-08-2020 at 12:45 AM. |
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11-08-2020, 12:22 AM | #22 |
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For most VLN GT86 cars rear diff upgrades are more common. TGM released a Technote on repacking the CV joints with High temp grease and adding a breather tube.
A lot of the teams run solid bushes to raise the diff up to reduce drive shaft angles, drive shaft failures are probably the most common failure, not sure if you would go that far on track days The ring is a lot harder on a car than a normal race track, its a toll road, so the surface is bumpy, there are many more of camber corners, traffic is a nightmare, locals in very rapid old golf GTI's rental GT3 Porsche, Tourist Busses. Normal trackday prep and spanner check, seat time and start with handling upgrades once you happy with the car |
11-08-2020, 10:54 AM | #23 | |||||
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Also, car is daily-driven and I like that the oil gets up to temp quickly. Even with a thermostat, engines take a longer to get up to temp with an oil cooler. Nice short article from Hot Rod (some may scoff but these guys know engines infinitely better than the more mainstream mags): https://www.hotrod.com/articles/engine-oil-temperature/ For a dual-purpose car, engine oil needs to be at least 220 degrees F to burn off all the deposits and accumulated water vapor. A quality conventional motor oil will tolerate oil sump temperatures of up to 250 degrees, but starts breaking down over 275 degrees. Even on a short-duration, drag-only combo where oil is frequently changed, I would not want to routinely see under-200-degree oil temps. A full-synthetic oil will withstand sump temperatures in excess of 300 degrees, and for hard-core professional racing, some oval-track race teams are experimenting with ultra-thin, specially formulated, race-only synthetics operating at 350 degrees or even higher. Quote:
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When I worked at Lockheed-Martin I had to update the Force Structural Maintenance Plan for C5 aircraft (the 2nd boringest job I've had in my engineering career). It was important to not overspecify inspections and parts replacements because at a certain point the risk of damage during inspection/replacement and also the risk of replacement parts being defective becomes a greater risk than not doing anything! Last edited by ZDan; 11-09-2020 at 09:53 AM. |
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11-08-2020, 11:07 AM | #24 | ||
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Last edited by ZDan; 11-08-2020 at 11:19 AM. |
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11-08-2020, 01:12 PM | #25 |
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Oil cooler, Brake pads, Fluid change and your golden for now.
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11-08-2020, 03:08 PM | #26 | ||
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But, the question I have is, what is the minimum oil temp before driving it hard up to redline (full synthetic)? Quote:
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11-08-2020, 08:18 PM | #27 | |
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Oil pressure is super high on the FA20 when the oil is cold. When you start the car bone cold, the cold start at 2k RPM is about 8 Bar/115 psi, about 20% higher than the typical pressure for redline warm (~6.5 Bar/95 psi) |
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11-08-2020, 08:32 PM | #28 |
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Is there any data on effects on running oil below operating temp for prolonged periods?
With JR oil cooler I could not reach operating temp on the street without hooning, it would stay around 170 even blocked off with a cardboard. But it performed flawlessly on the track.
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