Cockroach Individual M3 6/18 1YR Update, ST40 Frnt BBK, PB Road Atl sub 1:40 Roadtrip

[bigjae46]

Dude, run 17s. So much cheaper. 275/40R17 660s are $1100 shipped from Tire Rack.

[samthejam]

Dude, run 17s. So much cheaper. 275/40R17 660s are $1100 shipped from Tire Rack.

I'm not against it, just using the wheels I have

[samthejam]

Untitled by Sam DaJam, on Flickr
Untitled by Sam DaJam, on Flickr

Did some research and found some Porsche Bilsteins that fit. I did the same thing for my E28 since it did not have much aftermarket support, Porsche shocks are great to adapt as they are valved fairly stiff since Porsches have an engine in the back. They are also shorter, but the bumpstop engagement looks perfect. I went with the stiffest one I could find as I have a stiff rear spring. Older 911s have a lot of different options for OTS Bilsteins.

Just got back from a test drive, best the car has ever felt. Firm but supple ride, way more rear grip. Just feels good. I had to get some adapters but got lucky with scamazon.

[nextlvel]

One of my fave build threads by far, all the pictures and background make the whole thing so much more "real"

[samthejam]

One of my fave build threads by far, all the pictures and background make the whole thing so much more "real"

Glad you are enjoying following along!

[samthejam]

I have a used BBK on the way Stoptech ST40, looks like 355x32mm rotors. I am archiving the part numbers I might need here for reference as I know availability is getting rough.

Just want it it to be saved somewhere, I can get to on my phone.

Looks like the kit is:

https://www.bimmerworld.com/Brakes/BMW-StopTech-Big-Brake-Kits-BBK/StopTech-Big-Brake-Kit-Front-M3-E46-355X32-ST40_7.html

83.137.4700

Aerohats:
37.137.7415

355x32mm Slotted Left Aerorotor with hardware:
SRT31.737.1101.99

355x32mm Slotted Right Aerorotor with hardware
SRT31.737.1102.99

Girodisc Brake Rotor Set with Hardware:
- GD355.32.52

https://www.bimmerworld.com/Slotted-Rotor-Rings-Girodisc-355x32.html

Pad Info:
Hawk Pad Shape: 650
PFC Pad Shape: 447
Pagid: 1204

https://www.bimmerworld.com/ssearch.html?query=st40+Pads

" FMSI D372, D447, D609. Fits:
1994-98 Audi RS2
1994-96 Ferrari 456 GT Coupe Rear
and many Porsche models, including:
1996-98 911 Carrera 4 rear
1991 911 Turbo
1986 928 S
1987-91 928 S4
1990-91 928 GT
1989-91 944 Turbo
1992-95 968 Sport
Also fits the Stoptech ST40 caliper.

| Brand | Part # | Description |
|-------------|-------------------|--------------------------------------------------------|
| PFC | 0447.08.17.44 | 08 Compound – Endurance racing, low wear |
| PFC | 0447.11.17.44 | 11 Compound – All-purpose racing, flat torque |
| Hawk | HB141U.650 | DTC-70 – Max bite, aggressive track use |
| Hawk | HB141G.650 | DTC-60 – High torque, better modulation |
| Hawk | HB141N.650 | HP Plus – Street/track hybrid |
| Hawk | HB141B.650 | HPS 5.0 – Performance street pad |
| Ferodo | FCP372H | DS2500 – Street/light track, refined feel |
| Pagid | U1204 14 | RS14 – High bite, ceramic-based race pad |
| Pagid | 63-910-0609 | RSL29 – Endurance compound, consistent wear |
| Porterfield | AP372-R4 | R4 – Full race pad |
| Porterfield | AP372-R4S | R4-S – Street/autocross pad, rotor friendly |
| Centric | 105.06090 | Posi Quiet Ceramic – Low dust, street use |
| StopTech | 334.0609.17.0 | SR34 – Full race pad, high bite, low wear |


I'm pretty sure there is a spec series, not sure if its a 928, 944, or 968. "

PFC 11:
-0447.11.17.44


Brake Line Set for front:
950.34005 (this is wrong this is for stock calipers)
950.34000 (this is for st40 kit)

Caliper Rebuild Kits:
They seem available but you need to know if long or regular piston? Different diameters from 26-40mm?

https://www.zeckhausen.com/catalog/index.php?manufacturers_id=2&srsltid=AfmBOoreRSya8 OkJPSKmsWSSIvjCikHMGOAQIwcrM2lIpgm9mnzTwUEB

Caliper Bracket part #s:
36.137.7419

https://nam3forum.com/forums/forum/classifieds/members-parts-for-sale-wtb/e46/251924-stoptech-front-st40-bbk-new-girodisc-rotors

Caliper Assemblies in Black:
ST-40 caliper, 38/44mm pistons, black, 32mm wide, trailing R (ACS.43E.1154)
ST-40 caliper, 38/44mm pistons, black, 32mm wide, trailing L (ACS.43E.1153)

Hardware:???????????????

https://images.carid.com/stoptech/info/pdf/catalog.pdf

[samthejam]

I was able to repair the AST shock, or it hasn't leaked for the past 200 miles. We'll see how long that stays. More about that here, that was my favorite automotive side quest by a huge margin in a long time. More about it here.

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/292889-before-i-lose-my-mind-ast-4150-setup-opinions

Untitled by Kurvenkamph Motorsport, on Flickr


I also got the 70C stat in, from my current observations it will not do any miracles. It definitely increases oil warm up time. The car will need a better rad, however the thermostat will help me know if I'm going in the right direction for certain thermal conditions and also allow me to bring the cooler temps down more than with stock thermostat for cool down laps before I get on it again. Probably will try a Koyo rad first?

AC OFF
Untitled by Kurvenkamph Motorsport, on Flickr

AC ON
Untitled by Kurvenkamph Motorsport, on Flickr

If it's 90+ or greater it's just in the standard buffer range cruising or at idle.

Untitled by Kurvenkamph Motorsport, on Flickr

[samthejam]

It's officially been one year with the car, 28,000 miles in that year.


I actually washed it!
Untitled by Kurvenkamph Motorsport, on Flickr

I did Road Atlanta again, I did a bad job planning. It came up a week quicker than I thought. So I was gonna have to do the BBK there. Which I was nervous about for this reason. So my wife and I left early, spent a night in NOLA in the french quarter. Got to Atlanta early Friday to do the BBK.
Untitled by Kurvenkamph Motorsport, on Flickr

Idk what other monkey worked on this car, but brakelines are like a sacred thing to not fuck up for me. When I initially tried to change these, I could not get them loose. Luckily with jayjaya29 help they loosened right up.
Untitled by Kurvenkamph Motorsport, on Flickr

He also trimmed the heat shields for this, and donated some stuff from his parts car and bent the hardlines into their homes so that is all correct now.
We were left with this a Stoptech ST40 BBK. I also installed some NOS softlines from Stoptech and NOS PFC 01s.

Untitled by Kurvenkamph Motorsport, on Flickr
Untitled by Kurvenkamph Motorsport, on Flickr
Untitled by Kurvenkamph Motorsport, on Flickr

Track driving is not a stopping contest, but the confidence this setup gives me now has been amazing. I am no longer scared of brake zones in this car, so I can be more brave experimenting.

Untitled by Kurvenkamph Motorsport, on Flickr


Car is still getting hot. This issue is really pissing me off. I will do a separate post about that or maybe even thread. It is only replicatable on the track at full pace driving, 85 degrees+. The other issue is the LR shock I rebuilt, despite not leaking did fail. I believe I go the dividing piston in wrong spot and it adjusted itself, as well as overfilled it. So when it moved down there no air near the top/most of its stroke. So my LR damper was struggling, I was able to get the shock settings good enough to drive it. I wanted to perservere and drive through the issue and I did to break a sub 1:40. Also not really a fan of the ECFs.


Untitled by Kurvenkamph Motorsport, on Flickr
After that I did try the Bilsteins, and it makes the car much easier to drive as well as not beating me and the car up.

However, I really like the ability to just have turn in sharp enough to hurt myself. I don't like trail braking and dealing with understeer. I really enjoy just putting the car in a slide and holding it, so while the Bilsteins will work in the long run I hope I am not stuck with them.

Untitled by Kurvenkamph Motorsport, on Flickr


I spent about 3-4 hours assembling the AST upon returning home from my 13 hour drive. I believe I have it right now. So that issue I'm not too terribly worried about, it's back in car. Time will tell. However the cooling system getting that sorted for 20 minute sessions of driving how I like to will need to be figured out. We did try a stock undertray this weekend.

Overall an absolutely amazing trip.
Untitled by Kurvenkamph Motorsport, on Flickr

Here is video of the best lap:

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