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Old 08-19-2016, 10:17 AM   #57
DarkSunrise
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What are your thoughts on the diff inserts alone? Most people seem to install the subframe bushing inserts first or at the same time with the diff inserts, so I'm curious if they make an improvement by themselves.

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I'd call them a small improvement overall. I initially put them in to reduce drivetrain lash. It helps somewhat, but the more noticeable change was how they made the rear more responsive to throttle. It's like the stock setup would absorb some of the initial application (or lift) of throttle in corners, but the inserts will transfer more of that to the wheels. Not a huge difference though. Probably most noticeable in rainy track days with lift-throttle oversteer.

On the street, there's slightly more gear noise but nothing significant. My wife didn't even notice. I'd recommend them.
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Old 10-18-2017, 08:56 AM   #58
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Current Mods [As of 9/13/16]

Engine/Exhaust/Tune
- JDL UEL coated header -7 lbs
- JDL overpipe
- Berk catted front pipe
- Perrin resonated CBE -5 lbs
- Openflash Tablet

Wheels/Tires/Brakes
- RR Racing Stage 2 BBK / Wilwood BP20 pads [FRONT] -3 lbs
- Carbotech XP10 pads [REAR]
- ATE Type 200 brake fluid
- WedsSport TC105n 17x8 +42 / BFG Rival 225/45/17 -20 lbs
- Apex ARC-8 17x9 +42 / Hankook RS3 235/45/17

Suspension/Chassis
- RCE T2 coilovers
- Subaru OEM front camber bolts
- Whiteline rear differential inserts

Pointless vanity mods
- JDM clear sidemarkers

Total weight savings: 35 lbs + 30 lbs spare/tools = -65 lbs as tracked
------------------------------------------

Planned Mods -- Nothing crazy, just making the car more track-focused.

Engine/Exhaust/Tune
- Exedy Stage 1 Clutch & Flywheel [purchased] -7 lbs
- FT-86SF 11 lbs Braille Battery -20 lbs
- RR Racing 2-pc rotors/stg4 [FRONT] -10 lbs

Addtl weight savings planned: -37 lbs
I'm curious why the 235/45/17 tires on the Apex 17 x 9 rims? Is it to allow more chamber and no rubbing?
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Old 10-18-2017, 09:49 AM   #59
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I'm curious why the 235/45/17 tires on the Apex 17 x 9 rims? Is it to allow more chamber and no rubbing?
No I got the Apex wheels intending them to be my street & backup track setup. I went with 235/45 to get a bit more ride compliance and lengthen the gearing slightly for the street.
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Old 10-18-2017, 10:27 AM   #60
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No I got the Apex wheels intending them to be my street & backup track setup. I went with 235/45 to get a bit more ride compliance and lengthen the gearing slightly for the street.
I know my son's Apex rims with 245/40R17 tires & RCE Yellow springs limit the camber to < 1 due to the close proximity to the tower. I am thinking the 235/40R17 might be a better compromise to get more camber. Just wasn't sure about that tire size on a 9" wide rim.

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Old 10-18-2017, 04:35 PM   #61
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I know my son's Apex rims with 245/40R17 tires & RCE Yellow springs limit the camber to < 1 due to the close proximity to the tower. I am thinking the 235/40R17 might be a better compromise to get more camber. Just wasn't sure about that tire size on a 9" wide rim.
Yeah that sounds about right. When I was on stock suspension, I had 235/40/17 Nitto NT05 tires on my Wedssport wheels (17x8, +42 offset). I was at -1.5* camber in the front using crash bolts and clearance was tight, maybe 5 mm or so between the tire and strut.

If your son wants about -1.5* camber, I think the 235/40/17 tire size could work. It'll run slightly wider on a 17x9 wheel, but there should be just enough clearance to make it work. Some tires run wide though so be careful with tire selection. (Also in case you're worried about it, there's no issues mounting a 235 width tire on 9" wheel.)
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Old 06-12-2020, 10:50 PM   #62
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Coming up on my first track day in a long while! Buttonwillow CW13. Very excited to try out this track. It'll be an open lapping day, so expecting a lot of seat time. In preparation, I knocked out some maintenance items:

- Changed tune from e85 back to 91
- Replaced rear rotors (Centric blanks)
- Swapped to track pads (F Wilwood BP20 / R Carbotech XP10)
- Trans and diff oil change (Motul Gear 300)
- Swapped back to track wheels/tires (17x9 Apex ARC-8 / Hankook RS3 235/45/17)
- Brake fluid change (ATE Type 200)
- Alignment

For the alignment, I went to West End and dealt with Chris. Great guy, very knowledgeable and easy to work with. For the alignment:

-2.8 degrees front camber, 0 toe
-2.0 degrees rear camber, 1/16" toe-in

I was a little hesitant on adding toe in the rear (I typically like 0 toe), but Chris thought it might be better for traction on corner exit.

Will give the car a shakedown in the canyons before hitting the track, but everything seems ready to go.
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Old 06-16-2020, 11:14 AM   #63
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Canyon shakedown run went great. No mechanical issues. The rear rotors have a nice even transfer layer on them now. Friend came along with his S2000. Definitely notice the power difference now that I'm back on the 91 tune haha.

I also noticed more understeer with this setup, but nothing concerning. I'll see how the car does at the next track day and possibly play with the alignment from there. Can't wait to hit the track again!
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Old 06-20-2020, 11:03 AM   #64
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Buttonwillow was a success! The car ran great all day, surviving about 4 hrs track time in 100-105 degree temps with zero problems.

Couple of quick thoughts:

1. Forgot how much fun it is going to the track! Love being able to completely explore the limits of the car in a controlled environment. Turn8 did a great job organizing. Buttonwillow cw13 was a ton of fun too. Elevation changes, slow corners, fast sweepers, lots of places to play around with the handling balance using the throttle.

2. The tires (hankook RS3's) are done. I think not tracking for 3 years and just street driving on them really shortened their lifespan. I drove a friend's BRZ (on relatively fresh a052's) to confirm and sure enough, I could stay on the throttle and hold lines that I couldn't on my RS3's. My friend had the same thought after driving my car. I'll try to kill these tires off and get a fresh set, maybe try champiro sx2 for 86cup.

3. It's been a while since I drove a stock Twin and I didn't realize how much more oversteer my car had. Coming out of the 2nd gear corner "off ramp", I could easily rotate the rear on my car and hold a slight drift (for fun), but couldn't do it on the stock suspension BRZ. May be related to lower grip tires (#2) as well.

4. The extra camber in the front was great. I still had to keep tire pressures higher than I like at 34-35psi to avoid rolling into the sidewall, but much better than before. Id love to get -3.3 degrees next.

5. Engine held up well after the recall. I noticed I now lose a slight amount of oil (about 1/4 quart during this last track day), but otherwise it keeps cranking along. Didnt even lose any coilpacks!
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Old 10-10-2021, 07:11 PM   #65
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Another fun track day in the books at Buttonwillow. It was my first time instructing. I lucked out that my student was a friend who I hit the canyons with often. He drives an AP2 s2000 which I’ve driven a lot and is similar to the FR-S, so pretty easy time instructing all things considered. The hardest part was probably being on the track constantly, which gets exhausting!

It rained the second session which I used to hate, but this time it ended up being really fun practice catching slides. After that session, catching oversteer in the dry sessions was easy since it’s slower/more predictable. Made me appreciate wet track days in a way that I didn’t used to.

The champiro sx2’s are a great practice track tire (or spec tire). Not fast, but lots of feedback, predictable and durable. I was getting front outer shoulder wear with only -2.8 degrees camber, so I left my tire pressures high (33 psi cold). Ideally I’d bump the camber to -3.5 degrees or more but I can’t hit the track as often as I’d like, so I’ll leave the alignment for now. Btw still love the RCE T2’s. My student commented during a ridealong that the curbing only seemed to minimally upset the car. So good even a novice passenger could tell lol.

I think the mods to the FR-S are done. Only thing I’d change is to be able to use e85 on the track for a bit more power, but I was already burning through a tank of 91 every 3 sessions so I can’t imagine how much e85 I’d have to bring to the track. Hmm… maybe a good excuse to switch to the GR86 this winter.
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Old 10-12-2021, 02:19 AM   #66
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Favorite shots from the last trackday.
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Old 10-17-2021, 10:22 PM   #67
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We need to do a track day together. I will be at buttonwillow on the 17th

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RCE T2's, SPC LCAs -4/2.6 camber
JDL 4-2-1 EL, FP and OP, Tuned by Zach@CSG on e85
RR Wilwood Front/Rear Sport BBK, Motul 600 Fluid
ARC-8 17x9 SX2 GTs 245s/Koing 17x8 v730's 225's
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Old 10-18-2021, 12:42 AM   #68
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We need to do a track day together. I will be at buttonwillow on the 17th

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For sure. A few of my track friends have been talking about doing Lotus SoCal events. Supposedly small run groups and well organized. I’ll PM you next time we go. Only problem is a few of us have babies coming in the 3 months so probably won’t be out again until next fall. But I’ll let you know either way.
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Old 10-18-2021, 12:43 AM   #69
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For sure. A few of my track friends have been talking about doing Lotus SoCal events. Supposedly small run groups and well organized. I’ll PM you next time we go. Only problem is a few of us have babies coming in the 3 months so probably won’t be out again until next fall. But I’ll let you know either way.
Got ya!! I like do speed district as they keep car counts low. Your basically on track every hour

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Old 10-18-2021, 01:03 AM   #70
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Got ya!! I like do speed district as they keep car counts low. Your basically on track every hour

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Oh cool that sounds good too. I’m open to any org that maximizes track time and low car counts.
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