Black & Tan 332iT

[jrgatfh]

The v2 recaro brackets showed up, powder coated and all and I was able to get them in today. They’re millimeter perfect fitment in every dimension, and I’m very happy with the finish. Thank you sendcutsend!

Link to CAD, if you're inclined to recreate these: https://cad.onshape.com/documents/c4...d0507e4eaa81d3

Final bracket version installed:

I also installed the upper steering column trim from a late cabrio (still waiting on the OEM mic, just wired my existing one in for now) and swapped out the steering shaft flex disc. No pics of the flex disc but here’s the cabrio column trim:

Great thread and amazing build.

Love the idea of using the cabrio steering wheel trim to fit the microphone. Any additional information you can share on this? Have you finished installing it yet?

Is the factory mic plug and play with the AVIN radio? Or did it require some work to get it functioning properly.

TIA!

[Bry5on]

Low key couple of weeks. Took the time today to trim the intake duct a la M3 CSL along with a car wash and vacuum as it was getting pretty messy. Excuse the power wire that’s connected to my wideband for datalogging purposes (did my own WOT tune using Tunerpro). I also received the missing heat shield that keeps the AC working well. Gotta add a few nutserts to the frame rail and get that thing installed. The right time to do this is when the engine is out..

I also caved and ordered a Wavetrac and 3 new CV joints (diff from diffsonline). I loved the Torsen in my old 6-speed Z3 coupe and the diff in this M3 is tired. Goodbye m-clunk! Thanks in advance heinzboehmer and/or Trent for the extra hands.

[Bry5on]

Well, I'm on to Rev 2 of the CG location change sheet. Really just wanted to nail this thing..


And I've also started playing around with TunerPro. Very interesting to see how much correction there is in the WOT map from the stock CSL, and how the need for it aligns with my datalogs above.

And last but not least, for the record, slon tested the M3 v-brace at a 12% increase in torsional stiffness, with the strut brace at 20% - combining the two gets you 34%!

Factory tourings were already a bit more rigid due to the bonded rear glass and maybe the floor.
Assuming they are additive, this puts it at:


BMW E46 Sedan (w/o folding seats) - 18,000 Nm/deg
BMW E46 Sedan (w/folding seats) - 13,000 Nm/deg
BMW E46 Wagon (w/folding seats) - 14,000 Nm/deg
BMW E46 Coupe (w/folding seats) - 12,500 Nm/deg
BMW E46 Convertible - 10,500 Nm/deg
Slon stock M3 - 14,200 Nm/deg
Slon M3 with rear seat wall - 18,176 Nm/deg
Bryson 332iT - 18,760 Nm/deg

[Bry5on]

Spent some time datalogging with the wideband O2 sensor this weekend. I’ve got a tune on the car now which looks like it needs some work in the low end! This is several runs all logged on top of each other, with only WOT data points, as an example:

[Bry5on]

Now that I've got the corner weights and CG height, I was able to calculate my exact CG location. And not to put this information to waste, I built a spreadsheet to track changes to corner weight and CG location (incl. height) for any given modification. I just have to enter the x, y, and z coordinates (relative to the center X of the 4 wheels, on the ground) and the weight added or removed and I'll have new numbers generated automagically.


This spreadsheet technically works for any e46 (make sure your track and tire widths are correct) so I'm sharing it here in the case anyone else finds it useful. Enjoy!

CG location change.xlsx

[Bry5on]

Well, I did it..

[Bry5on]

I was literally just about to order some monoball RTABs and now this thread is making me think I should just get new OEM ones.

If you value a smooth ride, or if you frequently drive on crappy roads, I’d stay stock. The rear end definitely feels tighter with the monoballs, but you’ve gotta want that trade off. I’m also in a wagon which might make a difference in noise, although the RTABs are under the back seat, so I’m a little doubtful.

The commute today was fantastic. I drove with the stereo off

[Thoglan]

I was literally just about to order some monoball RTABs and now this thread is making me think I should just get new OEM ones.

[timmo]

Hah, same - between the spherical RTABs, GC 2-ways, and all the poly bushings.... well I did build my car for track but I don't do that anymore. My friend's beat-up 320 on stock suspension felt like riding on a cloud!

[Bry5on]

I did not notice any NVH when I did my RTAB from solid works design. But I do think is very noticeable to go back to stock more so than aftermarket as we have higher expectations when modding.

Totally agree. When I installed these, I only really noticed the harshness on hard impacts. Going back to stock really highlighted the NVH differences during all types of driving, especially a bit of drivetrain noise that came through that I didn’t realize. It’s subtle but does make a difference for a daily driver.

[maupineda]

I did not notice any NVH when I did my RTAB from solid works design. But I do think is very noticeable to go back to stock more so than aftermarket as we have higher expectations when modding.

[Bry5on]

I had a few hours to spare this afternoon and snuck in a couple things:
1: Popped the drivers door panel off, added a missing clip for the door handle and redid the butyl as it wasn’t sticky
2: Popped the passenger rear door panel off and repaired the blown out bavsound speaker. The dome had separated from the cone and made a buzzing sound at certain frequencies, especially male voices.
Separated:

Repaired, painted black with sharpie so it doesn’t show:

3: Adjusted the ebrake to the correct 3 clicks
4: Removed the bimmerworld solid RTABs and replaced them with factory bushings. Man oh man I’m a lot happier with the factory parts. The car is quieter at all speeds, downshifting/rev matching is smoother, and the suspension is so much smootherover all the broken pavement we have here. I did my best at approximating the alignment but I’ll have it aligned to CSL specs again sometime this week before I drive to Sacramento to pick up a Mini GP my friend just bought.
Bimmerworld installed:

Factory replacements installed:

Bimmerworlds must be trimmed so that puller tools can remove them

Anyone local to the bay want some 5,000 mile old bimmerworld RTABs? They’d be great for a weekend only driver.

[GreyM340i]

Amazing build! Love it

[Bry5on]

So today went rather well. I broke the scales out, along with my brother in law and his bike, and we weighed both, and also calculated the CG of both the car and the bike.

For the car, with a full tank, roof rack, a spare tire, e36 M3 (heavy) muffler, and all my 'always there' stuff under the trunk, the car came in at 3606lb without me and 3806lb with me. Weight balance is damn perfect at 48/52% Front/Rear !! and cross weight (without any shimming) came in at 49.66% with me in it. Hell yeah.



To measure the CG, I raised the rear of the car, corner weighed it again, and did some trigonometry. By my calculations, on stock M3 springs and 245/40/17 tires, the CG is 21.25" off the ground and centered fore/aft at pretty much exactly my seating position. Overall really happy with the results, even if the car is a little bit heavy with my choice of things.

CG measurement in progress:

[Bry5on]

The v2 recaro brackets showed up, powder coated and all and I was able to get them in today. They’re millimeter perfect fitment in every dimension, and I’m very happy with the finish. Thank you sendcutsend!

Link to CAD, if you're inclined to recreate these: https://cad.onshape.com/documents/c4...d0507e4eaa81d3

Final bracket version installed:

I also installed the upper steering column trim from a late cabrio (still waiting on the OEM mic, just wired my existing one in for now) and swapped out the steering shaft flex disc. No pics of the flex disc but here’s the cabrio column trim: