If you are going to track your car the three Rs will apply...race, repair and repeat. This is the reality with tracking...because race car!

Sent from my SM-G965U using Tapatalk

Did you turn off the TC l when you were tracking?

I had a OSG in the BRZ and they recommend we turn the TC off since you don't want sudden forces to hit the drivetrain.

:iagree:

I never have TC on. It is the first thing I turn off when getting into the car!

So after changing the diff fluid again. Found out the Whiteline bushing has melted that is next to the diff. Talking to company I bought it from, the diff should never get that hot. Definitely an issue with the diff I got.

That doesnt sound good, I hope you sort this out with them. Did you do the installation yourself?

Verstuurd vanaf mijn SM-G950F met Tapatalk

To melt the bushing. It got HOT. I would pull the diff out and inspect it. What did the fluid look like when you changed it?

Hot humid day, no way to cool the diff what do you expect. All high performance track cars come with some wAy to cool the diff and other components prone to heAt

Already ordered an OS Giken lsd and waiting for it to arrive still, but it looks like I’ll ya e to save some more for a diff cooler, if the extra capacity and the Z1 diff cover still didn’t allow the diff fluid to survive one full session.

I would remove the diff and inspect. I had a pinion on a diff come loose after a rebuild one time and it sounds a lot like what you're talking about. It will just get worse until boom.

<3 Gear diff. Clutch diffs have a lot of setup involved how aggressive is yours set to be, it should be on the less or even least aggressive engagement setting for road courses. How are your stack springs, plates active, etc setup?
Regardless there's no way you should be melting anything with a diff somethings defiantly wrong.

Mine looked exactly the same after 1st change new 4.08 installed at the same time. Was super grabby (sensitive for lockup) for the first 200kms and clunky/poppy but settled in fine. Only hit 80 degrees C (24 c ambient) on the weekend track outings. I did my first oil change 2000kms after install before I hit the track. I would definitely do the figure 8 break in even though OS giken says it’s not necessary if I had my time again.

This sounds more like an install issue than a diff issue. A few clutch plates should not generate that much heat to melt a bushing. Sounds like the gears were working way too hard.

Yep, I did the 10x figure 8 break-in first thing. I figured if it was good for other LSDs it couldn't hurt.

I bought the Z1 Prebuilt diff. So my mechanic just needed to just install the diff.