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Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) Everything related to the mechanical maintenance of the FR-S and BRZ


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Old 06-23-2021, 01:09 PM   #43
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Originally Posted by DarkSunrise View Post
From the pressures shown on this link, that means a 613 will still add another 16-17 psi oil pressure at 7000 rpm (assuming 235 vs. 275 F oil temps).
Assuming cavitation is not an issue. Like I have said, I don't get an RPM/PSI correlation due to cavitation. Even at sub 220F oil temps I only hit mid 40psi at around 7k rpm.
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Old 06-23-2021, 02:04 PM   #44
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I haven't had issue really. 5-6 years of tracking my car, though last year I only got to do one track day. It is mostly the FI guys that have issues but the NA cars will and can spin rod bearings too. I blew up my spare engine, but that was due to kicking out rocker arms.

I would just like to improve it to help longevity.
Do you have an oil cooler? How many track days/miles do you have on your engine?
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Old 06-23-2021, 02:07 PM   #45
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Assuming cavitation is not an issue. Like I have said, I don't get an RPM/PSI correlation due to cavitation. Even at sub 220F oil temps I only hit mid 40psi at around 7k rpm.
But wouldn't lower oil temp reduce the amount of cavitation? I have seen many reports on this forums indicating zero oil pressure issues @ 220.
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Old 06-23-2021, 02:09 PM   #46
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Assuming cavitation is not an issue. Like I have said, I don't get an RPM/PSI correlation due to cavitation. Even at sub 220F oil temps I only hit mid 40psi at around 7k rpm.
Yep definitely and good point. Out of curiosity, are the pressures you’re seeing consistent with those from Dezoris’ oil pressure testing?

https://www.ft86club.com/forums/showthread.php?t=76760
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Old 06-23-2021, 02:21 PM   #47
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Yep definitely and good point. Out of curiosity, are the pressures you’re seeing consistent with those from Dezoris’ oil pressure testing?

https://www.ft86club.com/forums/showthread.php?t=76760
Similar. My oil pressure climbs and hits close to 55-60psi and then drops after 5800rpm. He doesn't have data points for 5000rpm, but I would be betting he was seeing similar. My peak pressures are comparable and given more data points it may have been very close.
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Old 06-23-2021, 02:23 PM   #48
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Do you have an oil cooler? How many track days/miles do you have on your engine?
Yes, I am running the Setrab 613 core, and as @DarkSunrise pointed out already, it is pretty much maxxed with my setup and I would probably benefit from something a bit stouter. I am over 30 track days I have lost count. I also DD'd this car a lot it is over 90K miles now.

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But wouldn't lower oil temp reduce the amount of cavitation? I have seen many reports on this forums indicating zero oil pressure issues @ 220.
Given the assumption is the oil pump is being restricted mostly by the inlet side, no. Easier to suck water through a straw then a milkshake.
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Old 06-23-2021, 07:58 PM   #49
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Similar. My oil pressure climbs and hits close to 55-60psi and then drops after 5800rpm. He doesn't have data points for 5000rpm, but I would be betting he was seeing similar. My peak pressures are comparable and given more data points it may have been very close.
I was also seeing this pressure drop at high rpms and temps above 98C with 0w20. 5w30 cleared that right up. Cavitation is a destructive event, gouging micro grooves in the pump surfaces. Never saw any signs in my UOAs. Not saying it doesn't happen just think 0w20 drops viscosity enough where it no longer pumps effectively.
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Old 06-23-2021, 08:26 PM   #50
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I was also seeing this pressure drop at high rpms and temps above 98C with 0w20. 5w30 cleared that right up. Cavitation is a destructive event, gouging micro grooves in the pump surfaces. Never saw any signs in my UOAs. Not saying it doesn't happen just think 0w20 drops viscosity enough where it no longer pumps effectively.

It was about the same/slightly worse with 5-30 on my car


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Old 06-24-2021, 03:00 AM   #51
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This may or may not be relevant to the discussion at hand but I do find it interesting.

https://motoiq.com/resurrecting-proj...dy-oil-cooler/

In the comments they speculate that the bearings themselves aren't up to the task once they hit higher temperatures, and keeping them cool is the engine oil itself so if oil temperatures aren't kept in check it's the bearings themselves that start to fail.
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Old 06-24-2021, 08:02 AM   #52
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In the comments they speculate that the bearings themselves aren't up to the task once they hit higher temperatures, and keeping them cool is the engine oil itself so if oil temperatures aren't kept in check it's the bearings themselves that start to fail.[/QUOTE]

Interesting article. A quick google shows that modern car engines use an aluminum-tin-silicon alloy for crank bearing (coating) which in the tin-eutectic type (matrix types have melting points of 650C (1200F) has a melting point of 230C (446F). Oil temps in the hydrodynamic film however can reach 180C (356F). Do auto crank bearings have matrix type coatings or tin-eutectic? Found some evidence that it is the later. Lots of head space in any case.
Low or restricted oil flow causes heat; heat kills bearing seems to be the kill chain. Hence why that pressure sag near red line always scared me.
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Old 06-24-2021, 08:03 AM   #53
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It was about the same/slightly worse with 5-30 on my car


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What brand 5w 30?
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Old 06-24-2021, 10:25 AM   #54
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What brand 5w 30?

Motul 300v


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Old 06-25-2021, 11:08 AM   #55
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Similar. My oil pressure climbs and hits close to 55-60psi and then drops after 5800rpm. He doesn't have data points for 5000rpm, but I would be betting he was seeing similar. My peak pressures are comparable and given more data points it may have been very close.
This may be a bit specific, but I'm just collecting some data to make some general analysis. Is your oil pressure dropping above those RPM's no matter what oil temps you're at? Or does it start to occur at a specific oil temp (212F+ for example), and if so, at what oil temp or range do you start to see this become more prominent?

When switching to 5W-30, I understand that you still got pressure drops at high RPM's. Makes sense as 5W-30 doesn't have a significantly higher cSt value above 212F (something around 1 cSt). But did you notice the pressure start to drop at slightly higher temperatures, or was it fairly identical to the use of 0W-20? What I'm trying to say is, if you had pressure drops starting around 212F on 0W-20, did you now see a change to something like 220F with 5W-30, or was it still at around the same temperature? This question may be a bit too specific and I don't know if you compiled such data.

I am mainly becoming curious at what oil flow cSt value the pressures start to drop on our platform (that is if it is fairly consistent or within a certain range). From this I could potentially start to make some correlation as to what temperatures this would occur at depending on the oil weight being used. In addition, an approximate limit of oil temperature can be determined to be ideal prior to oil pressure drops.
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Old 06-25-2021, 11:19 AM   #56
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This may be a bit specific, but I'm just collecting some data to make some general analysis. Is your oil pressure dropping above those RPM's no matter what oil temps you're at? Or does it start to occur at a specific oil temp (212F+ for example), and if so, at what oil temp or range do you start to see this become more prominent?

When switching to 5W-30, I understand that you still got pressure drops at high RPM's. Makes sense as 5W-30 doesn't have a significantly higher cSt value above 212F (something around 1 cSt). But did you notice the pressure start to drop at slightly higher temperatures, or was it fairly identical to the use of 0W-20? What I'm trying to say is, if you had pressure drops starting around 212F on 0W-20, did you now see a change to something like 220F with 5W-30, or was it still at around the same temperature? This question may be a bit too specific and I don't know if you compiled such data.

I am mainly becoming curious at what oil flow cSt value the pressures start to drop on our platform (that is if it is fairly consistent or within a certain range). From this I could potentially start to make some correlation as to what temperatures this would occur at depending on the oil weight being used. In addition, an approximate limit of oil temperature can be determined to be ideal prior to oil pressure drops.
It was a long time ago I ran 5-30, I want to say it was similar I don't remember.

I notice the pressure drop pretty much at operating temp or above.
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