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      10-12-2020, 04:02 PM   #485
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Scary as hell, Derek! Great save though...was waiting for you to hit the wall when you originally posted; glad you're ok man!
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      10-12-2020, 10:40 PM   #486
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Seriously that's one scary spin!!! Good thing your ok and didn't hit a wall!! Your car will be back better. What cause the spin.
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      10-13-2020, 01:47 AM   #487
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Pucker factor on max! Great save indeed!
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      10-13-2020, 05:12 PM   #488
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Just saw the video - holy shit you had me dying even knowing how it ended. Urgh.
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      10-14-2020, 05:46 PM   #489
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Quote:
Originally Posted by cyberkaa View Post
Poor lip didn't live very long. Oh well, definitely came out on top with just a few minor bruises.
Very glad thats all I came out with.

Quote:
Originally Posted by 94jedi View Post
Scary as hell, Derek! Great save though...was waiting for you to hit the wall when you originally posted; glad you're ok man!
I didn't realize how close it was until rewatching the video...

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Originally Posted by M3_Legend View Post
Seriously that's one scary spin!!! Great your ok and didn't hit a wall!! Your car will be back better. What cause the spin.
It is a combination of things but mainly I had a poor line across Turn 1. My steering was not straight when going over the crest. AIM solo said 12.5 degrees to the left. Pair that with a slight drop of the pedal position from 100 to 80% at the crest created another lift scenario to make matters worse. It was also the 11th lap of the session and the PS4S were already pretty greasy.

I would say 90% of that spin was caused by my steering angle at the crest but this is self-coaching guy jumping to this conclusion.

Quote:
Originally Posted by wyatth View Post
Pucker factor on max! Great save indeed!
I rewatch over and over and think of what I could've done better.

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Originally Posted by Epoustouflant View Post
Just saw the video - holy shit you had me dying even knowing how it ended. Urgh.
Yea.. clearly others are rewatching over and over again too! I know I am.






I ordered replacement felt that went missing at Turn 2 Gravel trap and tie rods that were needed prior to the spin. I haven't figure out my rim situation yet.
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      10-14-2020, 08:29 PM   #490
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Good lord that was terrifying to watch lol
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      10-15-2020, 08:32 PM   #491
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What a save!

Which session was it btw? I was the gray M4 two cars ahead of you and I would like to check my video
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      10-15-2020, 08:44 PM   #492
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Quote:
Originally Posted by BetrayMyWord View Post
What a save!

Which session was it btw? I was the gray M4 two cars ahead of you and I would like to check my video
Hey!

Session 4. Pretty sure I let you all by before that happened. I was chasing Derik in the white E90, i let you both by before T11 1-2 laps prior.
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      10-16-2020, 01:27 PM   #493
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Before it all happened..lol


I ordered replacement felt pieces, tie rods, 600/900 springs and now looking at new rim setup. I'm leaning towards Titan7 R10s for the track set.

The GT4s will most likely get listed, either as-is or something similar. If anyone wants to talk price about them, feel free to PM me.
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      10-16-2020, 01:29 PM   #494
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Quote:
Originally Posted by derbo View Post


Before it all happened..lol


I ordered replacement felt pieces, tie rods, 600/900 springs and now looking at new rim setup. I'm leaning towards Titan7 R10s for the track set.

The GT4s will most likely get listed, either as-is or something similar. If anyone wants to talk price about them, feel free to PM me.
Why not have the bbs refinished? Also great time for a euro bumper!
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      10-16-2020, 01:31 PM   #495
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Quote:
Originally Posted by M4_GTS View Post
Why not have the bbs refinished? Also great time for a euro bumper!
Clearance between the ST60 and the GT4 is still very tight. There are other 18s" out there that clear a little better for track use.

The scoring on the barrel concerns me for track use but for street use, they seem fine to me.
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      10-27-2020, 10:44 AM   #496
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Wow, super impressed with the quality of your build! I really enjoyed watching the progress of your E90. I just picked up a 2011 E90 ZCP JB and am also in SF. We should go on group ride sometime.
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      10-27-2020, 02:27 PM   #497
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Wow, super impressed with the quality of your build! I really enjoyed watching the progress of your E90. I just picked up a 2011 E90 ZCP JB and am also in SF. We should go on group ride sometime.
Thanks! I'm really amazed how many E90s are actually around considering how "rare" they are.
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      11-02-2020, 09:44 PM   #498
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TL;DR



Titan7 R10s with Hankook RS4s.

600/900 springs. Height readjustment needed.

New felt trays.
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      11-02-2020, 11:48 PM   #499
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Looks awesome!!!! (and familiar
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      11-03-2020, 12:06 AM   #500
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Quote:
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Looks awesome!!!! (and familiar
Thanks man! I vaguely remember a Silverstone sedan that somewhat swayed me to these rims... 🤔
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      11-03-2020, 10:09 AM   #501
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Looks great!!!
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      11-24-2020, 01:48 PM   #502
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Titan's are looking amazing, nice change-up from the BBS
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      11-24-2020, 06:56 PM   #503
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Titan's are looking amazing, nice change-up from the BBS
Thanks! Funny, I still prefer the BBS over these but I'll talk more about that topic in a future post.
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      11-25-2020, 04:36 AM   #504
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Quote:
Originally Posted by derbo View Post
TL;DR

Titan7 R10s with Hankook RS4s.

600/900 springs. Height readjustment needed.

New felt trays.
They look fantastic.

I just viewed your video, and you seem to have done a superb job continually looking where you want the car to go and making that happen (watching your deliberate head movements amongst all the chaos of the spin). Good job.
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      11-26-2020, 08:53 PM   #505
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"Might as well" makes some changes


I realized I haven't really posted a full detail post on what has happened post-spin!

This is a longer post on changes to the car after my little spin at Laguna Seca. My original plan before my Laguna Seca off-road experience was to run the PS4S tires till the end of life. Also before the event, I ordered a set of Volk wheels that will arrive sometime in Spring 2021. The spin left me working on what the next steps were for me. I developed a checklist of items I wanted to address while it was "down."

# Goals List
  • Assess the damage and order new parts
  • Explore the idea of a set of dedicated track wheels.
  • Increase wheel clearance with shorter coil-over springs
  • increase spring rates with a higher priority for track use vs street.
  • Redial the suspension
  • Enjoy the car!

# Evaluation
During the Laguna Seca T1 spin, I hit two pit exit cones @ 117mph and spun into the gravel trap at T2. The damage report was as listed: GTS lip cracked, cracked bumper center grille, scuffed front bumper, under tray damage and face pitted and barrel scored BBS GT4 wheels from rocks between ST60 calipers. I was fortunate enough that this was all that was damaged. Luckily everything was pretty much easily replaceable except the BBS GT4 and GTS Lip. The GTS lip was just a pain in the ass for driveways, speed bumps etc and I decided to forego replacing the lip. As for the BBS..

# Wheels replacement time?
The GT4 faces all have pits from the gravel flying at it and the front barrels received scores from pebbles lodged between the barrel and the ST60 calipers. I asked myself, are these still structurally fine? Are they repairable? Should they be used on the track? Would they be okay on the street? With these questions in my head, I had to alter my original plan I had for these wheels. The original plan was to use the BBS GT4 for the street and my incoming wheels as my track set. Since the incoming wheels are taking at least 6 months to arrive, this incident made me realize 6 month wait rims probably isn't an ideal set of track wheels. This led to the decision to find a set of readily available rims that also were easily replaceable. With a track set to purchase, a set incoming from Japan, and the BBS GT4, thats 3 sets of wheels for a car that barely can use 1 set of wheels! Something had to go. Back and forth in my head, I ended up deciding to list the BBS since the I wouldn't just sell the wheels I've been waiting already a few months for and I didn't need two sets of street wheels.

My game plan became this: sell the BBS GT4s, use incoming wheels for street duty, and find a decent forged wheel for track use. I debated between Apex, BW, and Titan7s and ended up favoring Titan7 for track use. I ordered a squared set of 18x10.5 ET25 TR10 from Vividracing on a Tuesday afternoon and I receive them the next day! That is what I call availability! EC7R was a contender but it was so close to the GT4s that I wanted to try something new visually. I also bought a set of 5mm spacers to match the 18x10.5et20 on the other set of wheels.

# Titan7 TR10
I picked the TR10 because the radial TR10 looks more at home on a sedan. The TS5 seems more appropriate on the E92 and I didn't think it flowed as well for an E90. I opted for 10.5" rim so my options for tire sizes could be 275 through 295 tires. For now I wanted to keep the 275/35/18 and focus on a 200 treadwear tire. When I ordered tires, RT660 was not available just yet, so I went with Hankook RS4s. This should be a fun set of tires to run! With a 18x10.5 wheel up front, the inner wheel clearance needed some help from a shorter main spring. I also wanted to raise my spring rates so this was the perfect opportunity to switch over.

# Springs
Without a question, the 400lbs/in || 700lbs/in springs were on the softer side of things. The original build of the MCS 2WNR was to emulate Ohlins R&T Spring rates of 342/685 for the sake of being more street use than track use. After a few HPDEs now, I got the feel of the car and felt I could raise the rates a bit, sacrifice a bit of road comfort for better track use.

With all that said, the parts were starting to pile up!


VT Motorworks handled mounting the tires onto the R10s so I could do the rest of the work.

# Installation.

I ended up removing the front bumper too to readjust. Talk about a relaxing Sunday right?!



I set the wheels to 18x10.5 et20 (net)





Initial ride height adjustment

The shorter springs and stiffer spring rate altered my ride height dramatically so I had to reset it back to where I wanted it.
I ended up with F/R -25mm/-20mm from stock, or F/R -15mm/-10mm from ZCP springs. This gave the front a little less fender gap while not veering too off from the factory geometry too much. It is very similar to what I originally did years ago.

The final measurements fender to bottom center rim edge.
Front : 585mm ~ 23"
Rear: 572mm ~ 22.5"

# Alignment and Tie Rods
I went to VT Motorworks last Saturday for new tie rods and alignment after finalizing the height. wyatth and inviktus59 were also there doing a wheel swap so it was cool to see 3 slicktop E90s there. SuperSprint, Eisenmann Sport, and MPE were also all there for roll call.








My alignment was set with minimal toe-in front and rear and -3.0 front camber, -2.0 rear camber. We will fiddle more with this if we need to in the future but I think its a good place to start.

Thanks for reading the long post!



Car is now ready for last track day of the year next month!

On a final note, Venoxy Gauges and Apple CarPlay truly makes the interior feel a little bit more modern. It reaffirms my choice to keep a CIC screen.




Happy Thanksgiving everyone!
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      11-26-2020, 09:36 PM   #506
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Happy thanksgiving, great thread. Taking my car into VT next week. Let's meet up some time when you and wyatth are going for a drive, assuming E92's are welcome :-)

I'm in Russian Hill.
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