Wow.. thanks for the advice..
Actually i live in indonesia (equator country) hot as hell 😂😂

Today i change the wing because the stock one from brz body is too flat.. no downforce at all..

The suspension setup that you guys said is right.. same as the theory from internet

But in here all rc touring player *even the pro use the setup like that but need big amount of downforce at the back of the car

My car has the same setup as my friend.. except the bodyshell

His is raikiri gt and mine brz R&D version, his car is stable no spining then we change the bodyshell and his car has same issue as me lol

I still using the stock one tho if i use oil it will leak out

The front is packed with super heavy duty grease

But the back just a tip, the diff still loose

BRZ body is the top body used at Tamiya track in California... So it's a good choice. Most use the stock wing.

I can't speak to what the pros in Indonesia run, but most factory drivers that post their set up use the Internet theory.

Try out the "internet" set up and see if it solves your problem. It doesn't hurt.

It will make your life easier when you figure out the baseline set up and then tune the final parts with wing, body.

Thanks for the comments on the 44mm bones. I confess I never bothered to try the 44mm ones, I built them from new with 42mm ones and they also fit fine lol. And yes the 418 C-hubs are indeed fragile. I alternate between them and the flexi TA05v2 / FF03 ones depending on what I put my hands on first in my spares box. The TA05v2 ones 54031 or FF03 51293 do seem to last better, although I find not crashing really helps too.

Not hitting things always helps

Usgt build
 

What pinion and spur should I start with a 21.5 brushless setup?

If you have the high speed gear set and use the original motor mount, you can go with 82 x 49. That will get you in the ballpark of where you need to be.

In case it's not obvious, that's 64dp not the Tamiya 0.6 mod metric pitch gears. 82/49 gets you a 4.35:1 ratio.

Isn't that more of a 13.5 FDR, rather than for a 21.5?

82/49 64pitch....got it.

Thanks for adding that. I should have said that in my earlier post.

Lots of variables to deal with such as size of track, brand of motor, timing, etc. However, 4.35 FDR will get you close to where you need to be.

I'm running a 78/58 64p for 21.5 Novak Vulcan, zero timing.... Which is 3.5 fdr. To get there, I'm using the yeah racing mount and the gear cover over the pinion had to be trimmed... So not exactly TCS legal.

I generally set mine up in a similar way when I run it in the VTA class, but have an extra gear cover and stock motor mount to use for when I do TCS races.

Tamiya is releasing two new hard chassis for the TT02.. one in white and one in blue. Should have done black as well..

47339　　TT-02 Lower Deck (Hard/Blue)
47340　　TT-02 Lower Deck (Hard/White)

Yep, it's cool they are doing those stiffer chassis. But blue or white??