BRZ STI Parts poll

[chanomatik]

Everything I've read has always said, "17 inches". Because science!

[switchlanez]

Originally Posted by ichitaka05

Correction, 18's... so TRD claims

18s are functional for fitting the TRD BBK which won't fit with stock wheels. If I get 18s my car will feel incomplete without the STI BBK and Bilstein suspension (both already equipped on the BRZ STI in the OP) even if I don't need them haha but just to complete the package. These things are mostly for aesthetics until TRD/STI come out with some serious power mods.

Some tire sizes for reference:

2011 VLN FT-86


2012 VLN GT 86

Originally Posted by Moto-P

Note: none of these VLN GT86's run on 18"s and 19"s... All on 17"s and not because its cheaper. LOL!

Exmotion BRZ (driven by BRZ GT300 race car driver Tetsuya Yamano)


D1 HKS 86 (driven by Taniguchi)


BRZ GT300 (18" is justified in this case)



Some random BRZ pics from some JDM magazines that came free with my STI parts for your enjoyment :

[ichitaka05]

^true

But when Tsuchiya-san did 17 vs 18, 18's had a better time. When he race against TRD & Miata he chose 18 instead of 17's

[switchlanez]

Originally Posted by ichitaka05

^true

But when Tsuchiya-san did 17 vs 18, 18's had a better time. When he race against TRD & Miata he chose 18 instead of 17's

Not sure what brand wheels were in that comparison but I'm guessing the 18s were lighter than the 17s if they were different wheel models. In the race cars I stated, Toyota used 17" BBS and Exmotion used 17" Volk Racing wheels. Those BBS and Volk wheel models also come in 18" but there is a reason they didn't use 18s: weight. Another reason might be 17s have a taller sidewall which is less likely to puncture and makes the suspension softer (too stiff can be bad) which both are also better for everyday driving.

[ichitaka05]

Originally Posted by switchlanez

Not sure what brand wheels were in that comparison but I'm guessing the 18s were lighter than the 17s if they were different wheel models. In the race cars I stated, Toyota used 17" BBS and Exmotion used 17" Volk Racing wheels. Those BBS and Volk wheel models also come in 18" but there is a reason they didn't use 18s: weight. Another reason might be 17s have a taller sidewall which is less likely to puncture and makes the suspension softer (too stiff can be bad) which both are also better for everyday driving.

Tsuchiya-san was using Enkei Racing RSM9 17x8 offset 48 weight 16.93 (http://www.enkei.com/size_chart/rsm9.pdf) and running Yokohama Advan Neova AD 215/45-17 & total of -4kg than stock ones... vs 18's he used Enkei RC-T4 18x8.5 offset 48 weight 18 (not 100%) running Yokohama Advan Neova AD 235/40-18 & total of +8.8kg than stock ones.

Here are the times for all three at Twinring Motegi East
Stock: 1'46"071
Enkei 17's: 1'43"136
Enkei 18's: 1'42"984

[Turbowned]

The difference in lap times is likely in the tires, not the wheel size. He had an extra 20mm of rubber per corner with the 18's vs. the 17's. I'll probably run 18's for street wheels and 17's for track wheels. Just say "no" to 19's!

[ichitaka05]

Originally Posted by Turbowned

The difference in lap times is likely in the tires, not the wheel size. He had an extra 20mm of rubber per corner with the 18's vs. the 17's. I'll probably run 18's for street wheels and 17's for track wheels. Just say "no" to 19's!

Might be, but at the same time there's 12.8kg difference between those two also. 235 may give more traction... but 3.2kg each side weight on the wheel/tire does cause lack acceleration.

For me, I don't care bout 17 vs 18 or 19 stuff. I gonna test both 17's & 18's w different tires to fit for my need. If 18's give me the traction & movement I want w suspension setup I buy them, I'm totally go w 18's... but crossing my fingers, I'm hoping for 17's. 18 tires aren't cheap

[ngabdala]

I hear +48mm wheels make it difficult and cramped for adding in larger brakes.

Does the mm have to be lower or higher than 48mm to accommodate larger brakes?

[switchlanez]

Originally Posted by ngabdala

I hear +48mm wheels make it difficult and cramped for adding in larger brakes.

Does the mm have to be lower or higher than 48mm to accommodate larger brakes?

You want it to be lower so that the wheel face is pushed further away from the hub.

Everything including offset, wheel width, wheel diameter, and wheel design can make a difference. TRD has an 18x7.5 +46 wheel that fits with their BBK and a different wheel design with the same 18x7.5 +46 specs that doesn't fit with their BBK. Wheel makers like Volks may have a particular wheel model that does or doesn't fit with a BBK depending on variations of width or face style (spokes bow into the hub forming a concave shape due to wider barrel and/or more negative offset).

[chanomatik]

You put it in better words than what I was able to type out. I was going to bring up the JDM 12-spoke STI wheels that were used on Spec C's, Forester STI, Forester Sports, Camo FT-86, etc. They make +53 and +48 offsets at 7.5, 8 or 8.5 width in 5x114.3 and 5x100, some compatible with BBK and some not.

Fun stuff!

[cslntuee]

Originally Posted by AVOturboworld

I'll see what we can find out on the Japan side.

HI,
Do you get any information and also the ETA on its availability?
Thanks.

ps. By the way, does any people what’s material for these STI aero kit?

[TheSt|G]

Painted for sure. I also suspect the weight savings of the hood will be pretty minimal as the hood is aluminum already.

[chanomatik]

Paint-matched, yaye!

[chanomatik]

Originally Posted by switchlanez

I voted black but really only for the ground effects. Hood should be painted. Roof works either way. I liked how FiveAxis created a High Tech Two-Tone Retro Series for the FR-S. I'm trying to give my BRZ a more subtle version of the High Tech Two-Tone/blue panda treatment and not having to paint/vinyl anything (thanks to STI) makes it easier. Just waiting for those rear spats to be released + other black items on order.


Are you able to confirm if the rear spats will fit with the rear diffuser accessory without modification?

Get the rear spats now that they're here! Be a test mule!