DocWalt's 2022 WRB BRZ

[autoracer86]

Originally Posted by DocWalt

I've got 245s and it still rubs, haha. My first gen with 245 RE-71R rubbed as well with ET35.


Jon said going with 3mm spacers up front helped him a lot, no more rubbing.

Thanks for the info.Better to find out now then later I honestly wasn't expecting to hear they rub since it's such a common setup

Is it because you guys run so much camber ? I will be around -3.5 if I go with the SS2s and OEM crash bolts

[DocWalt]

Originally Posted by autoracer86

Thanks for the info.Better to find out now then later I honestly wasn't expecting to hear they rub since it's such a common setup

Is it because you guys run so much camber ? I will be around -3.5 if I go with the SS2s and OEM crash bolts

Most likely all due to the camber. It's not at all a bad rub, just some marks on the fender liner and it can rub paint off the frame rail.

[DocWalt]

A couple more Philly events in the books! I killed a set of tires at this one in April. Finished 8th in PAX.

Sunday there was another event, super challenging course and I think I just had a bad plan for the course. Finished 7th in PAX

[autoracer86]

you were very happy at the end of the first one great driving !!

[DocWalt]

We made the boring drive up to Pocono early yesterday for NEPA, the event was fantastic and we had a blast just driving and thrashing the car all day. Super fast and fun course, a real challenge.

I pulled off the fastest street tire run by a good amount and was second in PAX behind Jon in his STX FR-S, not bad at all!

Amy finished up 5th in STR and solidly in the top half of PAX even with her never getting very comfortable with shifting. The pedal placement in the BRZ is definitely not as good as in the RX-8 for shifting under duress. Proud of her for sending it even not being comfortable!

Had a new addition before the event too! Picked up a Perrin intake used from a friend:

[autoracer86]

Yeah that course looks fun and fast. Nice driving

[DocWalt]

Had a fun day with Philly & WDCR at Ripken stadium, pulled off another 2nd place in PAX and a win in STR. My car is working really really well, I ordered an OS Giken diff tuned by Shaftworks USA and I'm not even sure I need it, haha. I'll be installing that soon, but for now, a video of my fastest run. Amusingly, like every other Ripken event, I don't seem to find any time after my first run... Annoying, but glad I'm on pace right away at least haha.

[DocWalt]

I installed my Shaftworks USA tuned OS Giken Super Lock LSD this past weekend! Install went smoothly and no leaks. Here are some install pics, my feedback so far (very very limited feedback) is below.




Subaru *can* use the correct amount of RTV, wow!








The break in instructions for the diff, which explains the lack of meaningful feedback




Ring gear all torqued on with orange threadlocker in lieu of the stock locking tabs. Marked for future inspection.




Diff backlash checked out perfectly in spec, at the tighter end but NBD. The diff has less whine on decel now, haha.








Waiting for the cover sealant to cure, bored...




Installed a polyurethane shifter bushing, mostly because it was cheap. I've noticed no meaningful difference.




So for some initial feedback... With the caveat that I now have ~15 miles on the diff (of the 1500 street miles for full break in) and I'm using Motorcraft fluid, not the fancy OS Giken fluid.

The diff chatters bad on power in tight corners in my neighborhood but does not when coasting. I assume this is mostly just the oil, my ND Miata was silent and smooth as silk.

Feels awesome when attacking, drifts are super progressive and less snappy. When it's not drifting it just carves the line you picked, like it did on my ND. So you're on a line and you get on the gas and the nose almost wants to tuck itself in to counteract the natural push.

Seems to put power down better too, duh?

[bkd705]

Excited to hear your feedback as you rack up the miles on the diff. Its a mod that is allowed in my local TA series for my class and I'd love to do it at some point, considering doing a shorter FD with it (we have small track here).

Looking forward to your thoughts in the future!

[DocWalt]

I was a bit tired of the chattery/binding from the cheap break in fluid... So I swapped to the OSG fluid, haha.


With the Motorcraft fluid, the diff felt like it was sort of sticking. Driving around casually I'd go to turn in and the car sort of fought me until I took my foot off the gas and went to neutral throttle and the diff opened up.



The diff took a bit to work the other fluid out but now it's essentially silent and smooth. Feels really good. Just yeet it around corners and floor it and you get a super smooth progressive slide, like the diff is actively working to push you forward and arrest the slide. I can't wait to see how it does at autocross now!

[justinco]

Originally Posted by DocWalt

I was a bit tired of the chattery/binding from the cheap break in fluid... So I swapped to the OSG fluid, haha.

With the Motorcraft fluid, the diff felt like it was sort of sticking. Driving around casually I'd go to turn in and the car sort of fought me until I took my foot off the gas and went to neutral throttle and the diff opened up.

The diff took a bit to work the other fluid out but now it's essentially silent and smooth. Feels really good. Just yeet it around corners and floor it and you get a super smooth progressive slide, like the diff is actively working to push you forward and arrest the slide. I can't wait to see how it does at autocross now!

Same experience for me on my 2017 BRZ w/ OS Giken diff. Loud as hell with the break-in fluid (especially turning in parking lots) but quiet w/ OSG fluid.

They help so much in autox, I bet it will be one of your favorite upgrades

[DocWalt]

Did my first autocross yesterday on the new diff. Simmons codrove as well, so lots of runs and good competition! The diff definitely needs more break in usage and some dry runs, but so far the car seems more stable on entry and puts power down better on exit. Less snappy and you can be way more aggressive on power. I'm really curious how it behaves in the dry!

Here's my fastest run, good for 2nd in PAX. I was slower than Simmons in the slalom and a good bit slower into the far turnaround as well, I just braked too early.

Here's Simmons first (and only ) clean run in my car:

Here's his fastest run, with two wobbles of cones that just slid out of their boxes. He was taking it safe in the faster/sketchier places due to the conditions which I appreciate haha:

[autoracer86]

I still remember being shocked at Erics steering inputs when I first got a ride with him. I see he still has the same driving style

[DocWalt]

Originally Posted by autoracer86

I still remember being shocked at Erics steering inputs when I first got a ride with him. I see he still has the same driving style

We tested the course in my dad's FiST with my dad riding so he didn't have to stand outside in the rain.

First thing he commented on was Eric's steering inputs vs mine, haha.