Fallen RT 660 fitment - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Autoenthusiastasm · 05-18-2022, 04:40 PM

I’m running RT660 245/40 17 on a 9 wide 6ul and I’m getting a pretty good rub on the front wheel well that I did not get with the yokes. Also what tire pressure is working for everyone. I know it set up and course sensitive. I believe I have between 3 and 3 1/2 negative camber up front. I have less rub after I removed the camber and crash bolts from the front. On a low speed 49 second course , I found I had the best turn in at 25 psi up front with good rear grip at 27/28. 25 sounds too low and I don’t want t destroy my tires. Grassroots Motorsport tested them on a ND Miata and found 28psi was best. What is everyone else’s experience.

Code Monkey · 05-18-2022, 04:44 PM

You need at least 7mm spacers in front.

jflogerzi · 05-18-2022, 05:03 PM

What offset for the wheels?

Code Monkey · 05-18-2022, 05:05 PM

17x9 6UL so +40.

ZDan · 05-18-2022, 05:26 PM

Maybe try offset top mounts for more camber? Wouldn't go bigger than 3mm spacers if using stock length studs.

For pressure, I aim for ~35psi hot at the track. Or ~26psi front 28psi rear stone cold. In my experience most 200tw radials are fairly pressure insensitive within reason...

Autoenthusiastasm · 05-18-2022, 05:52 PM

If I used a spacer, I would upgrade and lengthen my studs. ARP

CSG Mike · 05-18-2022, 06:01 PM

Where in the wheel well are you rubbing?

Code Monkey · 05-18-2022, 06:14 PM

My guess is the usual suspects.

jflogerzi · 05-18-2022, 06:42 PM

Camber from the top hats is what you want. Camber from bolts bring you closer to the suspension. What's your ride height?

dreamwonder · 05-18-2022, 07:56 PM

Quote:

Originally Posted by Code Monkey

My guess is the usual suspects.

With +40 offset, Versus Steering Rack Limiter Kit will solve the rubbing. 1 spacer on each side is enough.

Autoenthusiastasm · 05-19-2022, 07:35 AM

Before removal of the camber bolts, top of the wheel wells under heavy braking, After removal. I’ll post picture of of the rub. Forward of the coil over . Ride height is not crazy low. I have a 1 1/2 l gap wheel well. I’ll measure. Sorry on the way out to work.

Autoxer62 · 05-19-2022, 08:30 AM

I'm running 28 psi square, that was faster than 30 and was also good based on surface temps and apparent tire patch contact. I tried 26 but it didn't really feel better to me and wasn't faster, at least when it's at least 70 outside. I didn't think to try something lower the first couple events this year, given where you live that may be a factor. Gonna be plenty warm this weekend, tho.

I do get a little rubbing at the front of the wheelwell, but nothing too bad, however I have +35 wheels.

Breezio · 05-19-2022, 09:10 AM

I currently have 255/40R17 660's on +40 6ULs. -3.8 camber up front.
I only rub on inside fender well at full lock. Not sure why you would be rubbing while braking.

I run same pressure setup as my Yoks, pyro'd the tire (autocross use) and everything looks good.
Cold: 27F, 26R
Hot: 28-29F, 27-28R

deca · 05-19-2022, 10:22 AM

I recently ran a session on 255 660s and had no noticeable rub. I'll be monitoring it as I spend more time on them though.

17x9 +35 with 4 degrees of camber.

05-18-2022, 04:40 PM	#1
Autoenthusiastasm Member Join Date: Oct 2018 Drives: 2013 BRZ Limited - stock Location: Upstate NY Posts: 62 Thanks: 9 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Fallen RT 660 fitment I’m running RT660 245/40 17 on a 9 wide 6ul and I’m getting a pretty good rub on the front wheel well that I did not get with the yokes. Also what tire pressure is working for everyone. I know it set up and course sensitive. I believe I have between 3 and 3 1/2 negative camber up front. I have less rub after I removed the camber and crash bolts from the front. On a low speed 49 second course , I found I had the best turn in at 25 psi up front with good rear grip at 27/28. 25 sounds too low and I don’t want t destroy my tires. Grassroots Motorsport tested them on a ND Miata and found 28psi was best. What is everyone else’s experience.

05-19-2022, 08:30 AM	#12
Autoxer62 Senior Member Join Date: Nov 2019 Drives: 2020 Hakone Location: Fairfax, VA Posts: 149 Thanks: 45 Thanked 70 Times in 51 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I'm running 28 psi square, that was faster than 30 and was also good based on surface temps and apparent tire patch contact. I tried 26 but it didn't really feel better to me and wasn't faster, at least when it's at least 70 outside. I didn't think to try something lower the first couple events this year, given where you live that may be a factor. Gonna be plenty warm this weekend, tho. I do get a little rubbing at the front of the wheelwell, but nothing too bad, however I have +35 wheels. __________________ -- Bryan Blackwell -- 2020 Hakone 86 -- KW V2 6k&9k/Karcepts Sway Bars/SPC&Diftech RCLA/SuperPro bshngs/17x9 RPF1/255-40-17 RT660/Hawk5.0 Pads/RacerX MC Brace

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05-18-2022, 04:44 PM	#2
Code Monkey Senior Member Join Date: Jul 2016 Drives: Subaru BRZ Location: Atlanta, GA Posts: 838 Thanks: 868 Thanked 562 Times in 337 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	You need at least 7mm spacers in front.

05-18-2022, 05:05 PM	#4
Code Monkey Senior Member Join Date: Jul 2016 Drives: Subaru BRZ Location: Atlanta, GA Posts: 838 Thanks: 868 Thanked 562 Times in 337 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	17x9 6UL so +40.

05-18-2022, 05:26 PM	#5
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,584 Thanks: 1,377 Thanked 3,891 Times in 2,032 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	Maybe try offset top mounts for more camber? Wouldn't go bigger than 3mm spacers if using stock length studs. For pressure, I aim for ~35psi hot at the track. Or ~26psi front 28psi rear stone cold. In my experience most 200tw radials are fairly pressure insensitive within reason...

05-18-2022, 05:52 PM	#6
Autoenthusiastasm Member Join Date: Oct 2018 Drives: 2013 BRZ Limited - stock Location: Upstate NY Posts: 62 Thanks: 9 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	If I used a spacer, I would upgrade and lengthen my studs. ARP

05-18-2022, 06:01 PM	#7
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,530 Thanks: 8,920 Thanked 14,177 Times in 6,835 Posts Mentioned: 966 Post(s) Tagged: 14 Thread(s)	Where in the wheel well are you rubbing?

05-18-2022, 06:14 PM	#8
Code Monkey Senior Member Join Date: Jul 2016 Drives: Subaru BRZ Location: Atlanta, GA Posts: 838 Thanks: 868 Thanked 562 Times in 337 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	My guess is the usual suspects.

05-19-2022, 07:35 AM	#11
Autoenthusiastasm Member Join Date: Oct 2018 Drives: 2013 BRZ Limited - stock Location: Upstate NY Posts: 62 Thanks: 9 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Before removal of the camber bolts, top of the wheel wells under heavy braking, After removal. I’ll post picture of of the rub. Forward of the coil over . Ride height is not crazy low. I have a 1 1/2 l gap wheel well. I’ll measure. Sorry on the way out to work.

05-19-2022, 09:10 AM	#13
Breezio Senior Member Join Date: May 2020 Drives: 2017 BRZ series.yellow Location: Idaho Posts: 195 Thanks: 105 Thanked 155 Times in 79 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I currently have 255/40R17 660's on +40 6ULs. -3.8 camber up front. I only rub on inside fender well at full lock. Not sure why you would be rubbing while braking. I run same pressure setup as my Yoks, pyro'd the tire (autocross use) and everything looks good. Cold: 27F, 26R Hot: 28-29F, 27-28R

05-19-2022, 10:22 AM	#14
deca Member Join Date: Feb 2019 Drives: Halo 860 Location: Michigan Posts: 84 Thanks: 14 Thanked 22 Times in 17 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I recently ran a session on 255 660s and had no noticeable rub. I'll be monitoring it as I spend more time on them though. 17x9 +35 with 4 degrees of camber.

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