THE LARGEST BMW 2-SERIES FORUM ON THE PLANET
2Addicts
2Addicts
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
2Addicts | BMW 2-Series forum Technical Topics Tracking / Autocrossing My track M240i(R?) build

Post Reply
 
Thread Tools Search this Thread
      03-23-2020, 12:23 AM   #1
msendit
Private
msendit's Avatar
71
Rep
82
Posts

Drives: M240i
Join Date: May 2018
Location: San Francisco, CA

iTrader: (0)

My track M240i(R?) build

A little bored cooped up at home, figured I'd start a thread to describe the process I went through with my track car. I don't know of too many B58-based cup car conversions (other than capt_and's), so figured it might be interesting.

I don't want to just put down a parts list, but describe my reasoning at each step, so I'll just post the different "stages" one by one. When I first got the car, I'd never stepped on a track -- it never even crossed my mind that there's an amateur level at motorsports. Having a bit more experience now, I'd definitely do many things differently (and probably not start with the F22 platform). But all in good time.

Anyway, here's what the car looks like now. The chassis and the engine have about 110-120 on-track hours on them. Current goals for it are mostly fun HPDE / occasional time trial. I don't plan to take it wheel-to-wheel racing, mostly because of the pretty high running / repair costs.



Appreciate 6
Maynard1294.50
Dylan861152.00
dradernh582.00
230iZTR61.00
ifobd11.00

      03-24-2020, 10:50 AM   #2
Dylan86
Colonel
Dylan86's Avatar
Canada
1152
Rep
2,096
Posts

Drives: Hard
Join Date: Jan 2016
Location: GTA

iTrader: (0)

More pics of the body panels/fitment if you could! This is a long term goal for me on the bodywork/cage side. Well done, sir

D
__________________
Appreciate 0
      03-24-2020, 12:19 PM   #3
dradernh
Major
582
Rep
1,271
Posts

Drives: 2017 M240i
Join Date: Aug 2013
Location: Ohio

iTrader: (0)

Quote:
Originally Posted by msendit View Post
Anyway, here's what the car looks like now.
The car looks good!

Do you know its on-track weight with you in it; if so, how many gallons of fuel are in the tank at that weight?
__________________
2017 M240i: MT, Moonroof Delete, EB, Black Dakota Leather, Driving Assistance Package, Heated Front Seats
TC Kline Coilover Kit; EDC/eLSD Delete; Wavetrac; Al Subframe Bushings; ARC-8 - 18X9 & 17X9; R888R - 255/35-18 & 255/40-17; Hawk DTC70; Schroth Quick Fit Pro Harnesses
Appreciate 0
      03-24-2020, 02:01 PM   #4
msendit
Private
msendit's Avatar
71
Rep
82
Posts

Drives: M240i
Join Date: May 2018
Location: San Francisco, CA

iTrader: (0)

Quote:
Originally Posted by Dylan86 View Post
More pics of the body panels/fitment if you could!
I'll grab some closeups later. Generally speaking it's OK, some imperfections here and there. I fully expect the panels to get bent / cracked / replaced #becauseracecar, so haven't been obsessing too much with fitment.

Quote:
Originally Posted by dradernh View Post
Do you know its on-track weight with you in it; if so, how many gallons of fuel are in the tank at that weight?
Not on this latest config. I need to get it corner balanced after the next time out, but it's a bit unclear when that will be.

Last weigh in I did was 3715 lbs with me (140) and a full tank (~12 gal). This was before the bodykit -- panels, wider tires, bigger brakes will probably add some, but I also had to remove some pretty heavy bracing to make space, so ... maybe 40-50 lbs more now.
Note I haven't done much in terms of weight reduction (yet?) -- all the interior panels / sound deadening are still there, massive OEM battery, A/C, etc. Oh, and the frigging sunroof!

Last edited by msendit; 03-24-2020 at 02:05 PM.. Reason: sunroof!
Appreciate 2
dradernh582.00
Dylan861152.00

      03-24-2020, 05:32 PM   #5
msendit
Private
msendit's Avatar
71
Rep
82
Posts

Drives: M240i
Join Date: May 2018
Location: San Francisco, CA

iTrader: (0)

Stage 1: stock(-ish)

End track-hours: 15-20

End parts/specs:
KW V3 coilovers
Ground control camber plates
Turner thrust arms with monoballs
Apex studs
RBF660 fluid
-2.2 F -2.2 R camber; ?? toe
MPSS/MP4S tires: 225/40/18, 245/35/18
Stock BMW rims: 7.5x18 ET45 F, 8.5x18 ET52
"compulsory" exterior bits: black grilles, black mirror caps, painted front reflectors

As I mentioned, I didn't get this car with tracking in mind -- I'd actually never been to a track before. I don't need a car for work, so it was mostly something for weekends / roadtrip adventures. The day after I grabbed it from the dealer, I took care of the engine break-in with a 2000-mi trip from San Francisco to Denver and back the scenic route, dealer plates and all (CO police was *not* happy about that!). I'd been reading the forums here, so I swapped the "compulsory" exterior bits literally on the side of the road somewhere in Nevada on the way.



I did a few other longer trips and was pretty happy with how the B58 pulled for overtaking. Plus, the usual other things -- some "spirited" runs on local twisties, some onramp kicks -- none of which were really pushing the car anywhere near its limits, but I was definitely enjoying it. Around that time, a coworker mentioned some "racing school" they've done on a local track, and the gears in my head started turning. I've been watching motorsports pretty much my entire life, but never really connected the dots that you can take a "normal" car on the track between the real races. Having a fast car, it was a no-brainer to try it.

First HPDE with the car (and for me) was pretty typical -- some nerves, big sensory overload, tiptoeing around, learning the line. Honestly I wasn't too impressed until I took a ride with my instructor (in some M4 IIRC) for a couple of hot laps. That was the holy cow moment when things clicked! I realized: (i) why the line was what it was, car just goes there anyway; (ii) how far away I was from any reasonable limit. These two laps were better than any crack that instructor might have given me... Now that I occasionally instruct myself, I always encourage my students to come along for rides.

Anyway, at that point, the car was bone stock. I did a couple more events in the next few weeks, learning to pick up the pace a bit. I destroyed my first set of front tire shoulders between two consecutive days, and put on whatever terrible all-season fronts the local Les Schwab in Yolo county had for the second day. This would pretty much set the tone for the next quite a while -- I'm pretty aware I'm the limiting factor for the car -- so I don't need a perfect setup to learn something new. Bonus points, I'd learn how to adapt to different setup changes.



I was reading the forums for camber solutions and it seemed like the M2 LCA thing was more or less half-assing it, but camber plates didn't work great with the stock suspension. So, decided to focus on the long term and invest in good coilovers and camber plates. I talked to a local performance shop, and they spent a while convincing me that the KW clubsport I had my eyes on didn't work with the new M240, only with the M235. In hindsight, total bollocks, but I ended up with KW V3s, Ground control plates, some camber, a fairly slammed ride height, and better brake fluid. Note to self, a pretty instagram page with shiny cars in front of the shop doesn't guarantee solid track knowledge.

With the KWs the car was leaning less in corners, and the front tires had a higher chance of surviving. Went through some more MP4s tires, stock pads (yay warranty), cracked the front bumper in my first off track excursion (it's still that way despite bondoing it like 5 times), moved to slightly more aggressive alignment settings each time, and put in thrust arms with monoballs mostly on a whim (and really appreciated the improved steering feel).

At this point, I'd learned how to push this setup hard enough that the MP4s were starting to chunk. Plus, I'd corded my tires a couple of times in the middle of nowhere, with very few replacment options. Sounded like the right time to jump to dedicated track wheels / tires. I put on some Apex studs to prepare for that.


Last edited by msendit; 03-25-2020 at 01:45 AM..
Appreciate 3
ifobd11.00
Maynard1294.50

      03-26-2020, 05:11 PM   #6
kthor703
Enlisted Member
12
Rep
49
Posts

Drives: 2015 M235i
Join Date: Nov 2017
Location: Washington, MI

iTrader: (0)

Sub'd for more. Fun read and enjoy seeing what other people are doing. I'm tracking on a mostly "stock +" set up now (GC Camber plates, 8.5" square with 235s, Hawk DTC 60s). Have a downpipe and just recently an intercooler, but run the stock map on the track, as it is plenty of power and keeps the consumables in check.
Appreciate 1
msendit71.00

      03-26-2020, 09:27 PM   #7
K8_M235i
Second Lieutenant
K8_M235i's Avatar
United_States
87
Rep
232
Posts

Drives: 2016 M235i 6MT
Join Date: Jan 2018
Location: Boston, Ma

iTrader: (0)

That's awesome. I went through a similar process as you described, but decided to buy an e36 track car.

This season (if it happens) will be its first as a legal race car.

Someday my m235 will be a race car as well, but I want to get some more time out of it on the street.
__________________
2016 M235i
6MT, LSD, Apex EC-7, Dinan Res Delete, XPEL, M-Perf Shifter, Carbon Mirrors, Black Kidneys, No moon roof, nav, or backup cam.
Appreciate 1
msendit71.00

      03-26-2020, 09:46 PM   #8
msendit
Private
msendit's Avatar
71
Rep
82
Posts

Drives: M240i
Join Date: May 2018
Location: San Francisco, CA

iTrader: (0)

Quote:
Originally Posted by K8_M235i View Post
That's awesome. I went through a similar process as you described, but decided to buy an e36 track car.

This season (if it happens) will be its first as a legal race car.

Someday my m235 will be a race car as well, but I want to get some more time out of it on the street.
Awesome. Yeah, that's the reason I'm keeping this one just for time trials / HPDE. It chews through consumables like candy and the dings you get in a real race won't be fun to pay either.

My "real racecar" is a '92 MR2. Sitting without an engine at the moment, but should be good to go once things come back to normal.
Appreciate 0
      03-26-2020, 09:51 PM   #9
K8_M235i
Second Lieutenant
K8_M235i's Avatar
United_States
87
Rep
232
Posts

Drives: 2016 M235i 6MT
Join Date: Jan 2018
Location: Boston, Ma

iTrader: (0)

Quote:
Originally Posted by msendit View Post
Quote:
Originally Posted by K8_M235i View Post
That's awesome. I went through a similar process as you described, but decided to buy an e36 track car.

This season (if it happens) will be its first as a legal race car.

Someday my m235 will be a race car as well, but I want to get some more time out of it on the street.
Awesome. Yeah, that's the reason I'm keeping this one just for time trials / HPDE. It chews through consumables like candy and the dings you get in a real race won't be fun to pay either.

My "real racecar" is a '92 MR2. Sitting without an engine at the moment, but should be good to go once things come back to normal.
My e36 is the same way right now. I'm currently re wiring the whole car and adding all necessary safety items like a battery cut off and fire suppression.

After this, I'll pull the drivetrain for a refresh.

At least we have time to work on them now!
__________________
2016 M235i
6MT, LSD, Apex EC-7, Dinan Res Delete, XPEL, M-Perf Shifter, Carbon Mirrors, Black Kidneys, No moon roof, nav, or backup cam.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 06:17 AM.




2addicts
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST