Another 2nd-gen engine failure at track...

[ZDan]

Originally Posted by spcmafia

Also, I saw that you’re coming to CT to race at Thompson which is a track that Ive been dying to go to. I do wholeheartedly wish you the best of the time. I wish I gathered the enough confidence and courage to track my BRZ. I’ve secluded my self to race simulators.

Thanks! Today went well but I'm going way too slowwwwww on the RT660s. Will put the Yoks on tomorrow, should be a lot faster. But my comp weight is 3107 lb., on 225s, while my competition (NC Miata) is more like 2600 lb. on 245s. Also he's a way awesomer driver than I'm, so it's looking like P2. If the engine doesn't explode before the TT!

Dude, *join us*! Palmer next month! You will have a blast...

Also I'm not nearly so much of a d*ck in real life...

[Ultramaroon]

Originally Posted by ZDan

I don't *hate* oil coolers, I just don't think they are a requirement for most of our cars.

[spcmafia]

Originally Posted by ZDan

Thanks! Today went well but I'm going way too slowwwwww on the RT660s. Will put the Yoks on tomorrow, should be a lot faster. But my comp weight is 3107 lb., on 225s, while my competition (NC Miata) is more like 2600 lb. on 245s. Also he's a way awesomer driver than I'm, so it's looking like P2. If the engine doesn't explode before the TT!

Dude, *join us*! Palmer next month! You will have a blast...

Also I'm not nearly so much of a d*ck in real life...

I would say that maybe there is something worth reading on the whole post lol. Maybe it will give more context.

Ive been thinking about tracking seriously and would be even more comfortable with a co-seater with experience, but I am afraid you bite haha. JK.

[ZDan]

Originally Posted by spcmafia

I would say that maybe there is something worth reading on the whole post lol. Maybe it will give more context.

Ive been thinking about tracking seriously and would be even more comfortable with a co-seater with experience, but I am afraid you bite haha. JK.

COMSCC is *GREAT* club. Lots of talented drivers and instructors. Sign up for Palmer! Or just come up and observe and you can get a "ride-along" for $35 membership. Very controlled, very safe, very FUN! Join us, it's blisssss....

www.comscc.org

also, Watkins Glen in September! A must...

[soundman98]

Originally Posted by ZDan

This "logic" is total, 100% b.s. The argument seems to be that since 5w30 doesn't drop below 7.5 cSt until it gets much hotter, then that means it *has* to run hotter to be "optimal"? In the *real* world, my car ran ~275 oil temps with 0w20 and ~275 oil temps with 5w30. The difference is that with 5w30 the kinematic viscosity is a lot closer to 7.5 and the 0w20 kinematic viscosity has fallen below 5.

Also, 275F *indicated* in the BRZ is more like 255F sump oil temp. And any decent synthetic is good for 300F+

i don't really buy that a thicker oil will heat up more, but what still concerns me is that subaru designed the entire motor around the thickness of 0-20 oil. 5-30/10-40 is still thicker no matter how we split it.

[Arthur-A]

Originally Posted by soundman98

subaru designed the entire motor around the thickness of 0-20 oil

[RZNT4R]

You guys are arguing a lot about oil weights when GT86 cup cars ran 5W50.

[sneaky_pete]

what I don't understand about all of this is why Toyota/Subaru didn't come across this problem during the development of the FA24 Gen2 BRZ/GR86.

surely they would have tracked this car hard during development and should have been monitoring oil pressures and temps during testing as well.

[RZNT4R]

Originally Posted by sneaky_pete

what I don't understand about all of this is why Toyota/Subaru didn't come across this problem during the development of the FA24 Gen2 BRZ/GR86.

surely they would have tracked this car hard during development and should have been monitoring oil pressures and temps during testing as well.

If it's blowing up on right handers, it should have been caught early on japan, just look at tsukuba. Turn 1, the penultimate hairpin and fast sweeping right leading to the start/finish line should be killing FA24s en masse.

[ZDan]

Originally Posted by soundman98

i don't really buy that a thicker oil will heat up more, but what still concerns me is that subaru designed the entire motor around the thickness of 0-20 oil. 5-30/10-40 is still thicker no matter how we split it.

The engine has to be OK for a *very* wide range of oil viscosities. Viscosity is *very much* a function of temperature. 5w30 and 10w40 at track operating temps of 270F+ are thinner than 0w20 at normal-usage oil temps. Go back and look at the plot in post #5. I run 0w20 in the colder months, but during track season when temps where I live are never below about 50F, and on-track oil temps are 270F+, 0w20 is IMO not the best choice...

[ZDan]

In other news, I won my time trial at Thompson (CT) Speedway yesterdee! 1:21.489, nearly a second faster with the new car than I ever went in the '17, despite having to run 200 lb heavier and on 225s instead of 245s. 2nd-gen is legit a much faster car. I just hope the engine hangs in there *fingers crossed*...

[Ultramaroon]

Let's not forget that fuel efficiency is the ONLY reason manufacturers are developing engines to survive thinner lube.

Let's also remember that this thread has more to do with the engine's vulnerability to oil starvation. It's a boxer. What else would we expect? Dry sump is the answer. With realistic expectations for manufacturing/build quality, some engines will inevitably give up the ghost when pushed.

[Yoshoobaroo]

Originally Posted by Ultramaroon

It's a boxer. What else would we expect? Dry sump is the answer. With realistic expectations for manufacturing/build quality, some engines will inevitably give up the ghost when pushed.

This. There’s a reason all Porsche’s boxers are dry sump now.
You could add an accusump to mitigate the pressure loss in corners, or don’t do track days on stupid-high grip tires on a stock car, you know unless you WANT all the oil to go on one side of the engine.

[Tokay444]

Originally Posted by soundman98

i don't really buy that a thicker oil will heat up more, but what still concerns me is that subaru designed the entire motor around the thickness of 0-20 oil. 5-30/10-40 is still thicker no matter how we split it.

You think they designed it on 0w20? LOL The 0w20 is ONLY in the crank case to meet the EPA mandated fuel economy numbers. Not because it protects the engine better, because it doesn't.