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      02-20-2013, 11:29 PM   #1
NRBRNG
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Sub 3300 pound winter weight loss results.

A while back, you may remember this happening after a weekend at Thunderhill in the 'safety' of my garage...Well the winter project(s) started:
Weight loss and handling was the name of the game, so the dinted sun-roofed roof etc meant an OEM Carbon Fibre replacement was in order.
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Since the rear glass was broken anyway, out comes the front windshield in order to remove the roof.
Fantastic service from Precision Auto Glass in Portland, and they got it out in one piece to retain for later!
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headliner out, removed entire sunroof cassette, roof air bags. Easy.
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At this point the cutting started. The early posts from IND showing the procedure on E90 conversions helped as did getting the right tools. The $4.99 spotweld-cutter bit from Harbor Freight was unbeatable!
All spot welds removed, a good seam splitter and patience worked great. I did protect all roof molding with tape and a strip of steel tape measure in between as addition protection in case the drill slipped, which it did once.
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Same thing all the way around. In total about 70 spotwelds were removed
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Off it came. No problems
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Clean.
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Tried this out for size (BW V1)- borrowed from Greg and Eddie at AR Auto Service in Portland for their E46 build.
I am going bigger...likely the APR GT250
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A present from Germany. The biggest PIA was the wait. What was quoted as 7-10 days ended up 7 weeks.
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Roof Bow purchased and put in (comes only on non-sunroof/CF roof cars).
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OEM fits like a glove. Worth the wait.
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OEM BMW specific adhesive. There are others out there,
but with the heat and flex expansion needs, OEM is good piece of mind.
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Job done. Fully cured in 24 hours. New black trim and sharks fin painted gloss black. Glass back in.
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Here in the NW we are lucky enough to get some short-notice good weather track days, so off to The Ridge Motorsports Park in Washington for a post hibernation few runs.
The difference in handling and performance was night and day. All in, I took out just shy of 300lbs from stock. Car feels so nimble versus last season. Took off 2 seconds and wasn't really trying this first outing.
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This is a pic from last year. All rear trim is out now.
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Now for some noise, and hopefully a few more ponies for the next track days. I have to say it sounds fantastic and zero drone.
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Catless GT4 midsection. 10 pounds lighter too...
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Replaces the Evo section, which i will keep for noise limit tracks.
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Clean. Fantastic engineering.
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New Bimmerworld 'race' control arm bushings
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Dinan R Toe Links and full track alignment.
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Stole the wife's MCS battery. Will be registered, but no issues so far.
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This was no driver, 1/4 tank of fuel. My goal was under 3300. Very happy. Slight weight distribution change was unoticable, with no increase in understear. Weight is our enemy on track.
Just need to get a latest catless tune from Mike Benvo and try the new set-up in a few weeks. Videos to follow then. Aero soon after...
Really happy with the results so far. Love the E9X M3.
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Last edited by NRBRNG; 02-20-2013 at 11:49 PM. Reason: lost images
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      02-20-2013, 11:58 PM   #2
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Light, fast and sounds great!
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      02-21-2013, 12:29 AM   #3
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Truly epic!
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      02-21-2013, 06:15 AM   #4
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Awesome!!

I plan to put an M3 CF roof in my car this summer.

How much is the weight difference exactly? Do you have the part number for that roof bow? Thanks in advance.
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      02-21-2013, 08:26 AM   #5
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      02-21-2013, 11:09 AM   #6
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I was there when the car was weighed. I was very surprised to see 3269 lb. Good Job!
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      02-21-2013, 02:04 PM   #7
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Very cool.
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      02-22-2013, 10:42 AM   #8
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Quote:
Originally Posted by Autobahn335i View Post
Awesome!!

I plan to put an M3 CF roof in my car this summer.

How much is the weight difference exactly? Do you have the part number for that roof bow? Thanks in advance.
Part number is 41007168999. Cost about $35. The roof is not a stressed member on this car, so this is more about stopping the cf roof getting too indented if pressed. You need to add some padding between roof and bow.

Sunroof to cf roof is a net 61 pound saving. Airbags were another 10lbs or so ( only if running race seats/cage/harness).
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      02-22-2013, 10:43 AM   #9
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Quote:
Originally Posted by warp10 View Post
What seats are you running?
Profi's
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      02-22-2013, 10:50 AM   #10
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Amazing transformation! I can imagine the HUGE diet to have made a difference.

Not sure if you're able to tell or not, but did you notice any change in NVH with the BW Race Control Arm Bushings?
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      02-22-2013, 11:13 AM   #11
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Nice work.
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      02-22-2013, 12:18 PM   #12
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mega awesome!! ..
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      02-22-2013, 10:15 PM   #13
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Quote:
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Amazing transformation! I can imagine the HUGE diet to have made a difference.

Not sure if you're able to tell or not, but did you notice any change in NVH with the BW Race Control Arm Bushings?
Thank you!
No difference on the road- have only just brought it from the shop and not used on the track yet. Main point is for entry turn-in and braking stability on track.
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      02-22-2013, 10:26 PM   #14
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nice to see you out there at the ridge and good to see this CF roof install. i may be looking to you for help if i decide to go this route also. congrats on the car. hoping to get mine to the 3400 lb range at some point.
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      02-23-2013, 01:30 AM   #15
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Nice work!

What was the weight of the car before you got all the goodies installed ?
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      02-23-2013, 07:35 AM   #16
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I have a sunroof sedan and agree that 3300 lbs would be a great weight. You did a nice job on the roof. Great to see DIY work.
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      02-23-2013, 09:06 AM   #17
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Such a well setup car! Sold my M3 to a friend who just had a bar and harnesses installed and it is amazing. I am now driving a .2 GT3RS which is a whole new experience for me. Hope to see you at the Ridge soon.
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      02-23-2013, 10:23 AM   #18
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Quote:
Originally Posted by NRBRNG
Quote:
Originally Posted by Autobahn335i View Post
Awesome!!

I plan to put an M3 CF roof in my car this summer.

How much is the weight difference exactly? Do you have the part number for that roof bow? Thanks in advance.
Part number is 41007168999. Cost about $35. The roof is not a stressed member on this car, so this is more about stopping the cf roof getting too indented if pressed. You need to add some padding between roof and bow.

Sunroof to cf roof is a net 61 pound saving. Airbags were another 10lbs or so ( only if running race seats/cage/harness).
61 lbs. from the top of the car is legit. Looks like an awesome project, thank you for sharing
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      02-23-2013, 10:43 AM   #19
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Quote:
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Nice work!

What was the weight of the car before you got all the goodies installed ?
Thanks!
i didn't actually weigh it. Likely close to your fantastic GTS build before you started, plus sunroof.
BTW, please pm me on the GTS splitter and (real) availability. I am about to press the trigger on the front and rear aero...Tx
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      02-23-2013, 10:47 AM   #20
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Quote:
Originally Posted by dawgdog View Post
Such a well setup car! Sold my M3 to a friend who just had a bar and harnesses installed and it is amazing. I am now driving a .2 GT3RS which is a whole new experience for me. Hope to see you at the Ridge soon.
Thanks Carl. I showed up late and missed you a few weeks ago. Hope P car is working for you. Catch-up soon at the Ridge as I would love your perspective on the two. I am waaay too far in on the M though...
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      02-25-2013, 03:52 PM   #21
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Nice work. Can't wait to catch up and see the updated beast. No hope to even try to keep up with you anymore though :-(
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      03-01-2013, 10:59 AM   #22
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Goes to show that it can be done. Biggest issue with our car is weigh indeed. With good driving skills, weight becomes the biggest issue, not unstable hp. Love the project. I don't see florpan, harness hanging etc as previosly suggested that the car would be compromised (hard to live with?) if "gutted". Noticed some of the fully gutted cars at NASA events having to add weight to make class prior to race events. You've done an amazing job. Absolutely love it. About the Porche GT3 weight neighbourhood now.
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