BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Track / Autocross / Dragstrip / Driving Techniques
 
Racewerkz Engineering
Post Reply
 
Thread Tools Search this Thread
      01-31-2013, 10:30 PM   #1
warp10
Captain
 
warp10's Avatar
 
Drives: 2011 M3 Jet Black:ZCP, ZCV, ZP
Join Date: May 2011
Location: Atlanta, Ga

Posts: 620
iTrader: (1)

Garage List
2011 M3  [5.00]
2011 28i X3  [0.00]
How is the M3 GTS running both the three point OEM belt and a race harness?

As quoted above. Thinking about getting a race seat as I am doing multiple track days a month but still daily drive. Wanting to keep the three point but want to have the availability of the six point for safety at the track. Please advise vendors and all.
__________________

2011 E92 M3 Coupe Jet Black ZCP: aFe High Flow Filter, AA HFC X-Pipe, UUC Corsa Exhaust, Evolve Stage 2 Tune w/ Servo and DCT, BMW Performance Electric Steering Wheel V2, CF Spoiler, and Front Splitter, Stoptech ST-60, KW Clubsports
warp10 is offline  
0
Reply With Quote
      01-31-2013, 11:15 PM   #2
w00tw00t
Lieutenant Colonel
 
w00tw00t's Avatar
 
Drives: 2013 Z06 & 2013 E92 M3 AW
Join Date: Oct 2010
Location: Seattle

Posts: 1,553
iTrader: (11)

subscribed!
w00tw00t is offline   United_States
0
Reply With Quote
      02-01-2013, 12:08 AM   #3
kaiv
Major
 
Drives: E92 M3
Join Date: Mar 2010
Location: San Diego, CA

Posts: 1,227
iTrader: (15)

Not sure what your question is but yes you can have both the stock 3pt belt and an aftermarket harness installed.

You'll need an OE style seat belt receptacle mounted on the aftermarket seat mounts.

Example on my old car:

kaiv is offline   United_States
0
Reply With Quote
      02-01-2013, 03:11 AM   #4
Richard@M-World
 
Richard@M-World's Avatar
 
Drives: NASA TTA #92 M3
Join Date: May 2011
Location: TX/IL

Posts: 683
iTrader: (0)

Yup as Kevin says some racing seat mounts offer attachment for the OEM seat belt receptacle. You can utilize the factory 3-pt system this way.

As for a 6-pt system, the only safe and proper way of installing them is to attach the shoulder belts to the roll cage/roll bar, and the anti-sub and lap straps to the chassis of the car with proper, welded reinforcement plates. Don't let anyone convince you otherwise.

Here are some pictures from the GT4 as they came from BMW. Courtesy of CheckCaptain.

Name:  Bild 001.jpg
Views: 991
Size:  162.9 KB
Left lap strap (left side of seat)

Name:  Bild 003.jpg
Views: 826
Size:  160.4 KB
Right lap strap (right side of seat)

Name:  Bild 006.jpg
Views: 447
Size:  158.5 KB
Anti-sub straps (under the seat)
__________________
Authorized AiM Dealer - Solo/Solo DL | SmartyCam HD | www.m-world.us
Richard@M-World is offline   United_States
0
Reply With Quote
      02-01-2013, 08:41 AM   #5
warp10
Captain
 
warp10's Avatar
 
Drives: 2011 M3 Jet Black:ZCP, ZCV, ZP
Join Date: May 2011
Location: Atlanta, Ga

Posts: 620
iTrader: (1)

Garage List
2011 M3  [5.00]
2011 28i X3  [0.00]
Quote:
Originally Posted by Richard@M-World
Yup as Kevin says some racing seat mounts offer attachment for the OEM seat belt receptacle. You can utilize the factory 3-pt system this way.

As for a 6-pt system, the only safe and proper way of installing them is to attach the shoulder belts to the roll cage/roll bar, and the anti-sub and lap straps to the chassis of the car with proper, welded reinforcement plates. Don't let anyone convince you otherwise.

Here are some pictures from the GT4 as they came from BMW. Courtesy of CheckCaptain.

Attachment 814212
Left lap strap (left side of seat)

Attachment 814213
Right lap strap (right side of seat)

Attachment 814214
Anti-sub straps (under the seat)
Great info thanks which floor mounts would fit this need. I it matters I am looking at OMP and recaro seats.

Thanks
__________________

2011 E92 M3 Coupe Jet Black ZCP: aFe High Flow Filter, AA HFC X-Pipe, UUC Corsa Exhaust, Evolve Stage 2 Tune w/ Servo and DCT, BMW Performance Electric Steering Wheel V2, CF Spoiler, and Front Splitter, Stoptech ST-60, KW Clubsports
warp10 is offline  
0
Reply With Quote
      02-01-2013, 11:03 AM   #6
bigjae1976
Takes threads off topic...daily
 
bigjae1976's Avatar
 
Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Milwaukee, WI

Posts: 5,070
iTrader: (11)

Garage List
2004 BMW M3  [4.50]
2011 BMW E90 M3  [5.00]
2013 BMW 328i  [5.00]
VAC makes some universal mounts for hte E9X.
__________________


Sponsored by Momentum BMW #593...We Bleed BMW BLUE!
bigjae1976 is offline  
0
Reply With Quote
      02-01-2013, 11:07 AM   #7
paradocs98
Major
 
paradocs98's Avatar
 
Drives: 2014 991 Carrera S
Join Date: May 2009
Location: NY

Posts: 1,342
iTrader: (0)

Quote:
Originally Posted by Richard@M-World View Post

As for a 6-pt system, the only safe and proper way of installing them is to attach the shoulder belts to the roll cage/roll bar, and the anti-sub and lap straps to the chassis of the car with proper, welded reinforcement plates. Don't let anyone convince you otherwise.
A really important point, because some vendors would have you believe (incorrectly) that you can safely attach the lap belt mounts and ASM belt mounts to the aftermarket seat mounts, and not directly to the floorpan.
__________________
IB E90 M3 ZCP returned to BMW FS
paradocs98 is offline   United_States
0
Reply With Quote
      02-01-2013, 11:19 AM   #8
bigjae1976
Takes threads off topic...daily
 
bigjae1976's Avatar
 
Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Milwaukee, WI

Posts: 5,070
iTrader: (11)

Garage List
2004 BMW M3  [4.50]
2011 BMW E90 M3  [5.00]
2013 BMW 328i  [5.00]
Quote:
Originally Posted by paradocs98 View Post
A really important point, because some vendors would have you believe (incorrectly) that you can safely attach the lap belt mounts and ASM belt mounts to the aftermarket seat mounts, and not directly to the floorpan.
So VAC's sub strab bar which bolts on to their FMAs are a no-no?
__________________


Sponsored by Momentum BMW #593...We Bleed BMW BLUE!
bigjae1976 is offline  
0
Reply With Quote
      02-01-2013, 03:17 PM   #9
paradocs98
Major
 
paradocs98's Avatar
 
Drives: 2014 991 Carrera S
Join Date: May 2009
Location: NY

Posts: 1,342
iTrader: (0)

Quote:
Originally Posted by bigjae1976 View Post
So VAC's sub strab bar which bolts on to their FMAs are a no-no?
I did a lot of research on this a year ago because I was really interested in doing a Recaro or RaceTech fixed bucket/VAC floor mount combo for my sedan. I wanted to do this for keeping more planted in the seat on the track and for safety considerations. I wanted to run a real 5- or 6-point harness with it, which would mean having the lap belts attached to the brackets on the VAC floor mounts, as well as the ASM straps attached to a bracket on the VAC mount. Since I have a sedan and not a coupe, I'd have to use a harness bar instead of a roll bar or half-cage for mounting the shoulder straps.

My reading indicated that this would be a half-assed solution at best, and potentially less safe than just running the stock 3-point belt. The harness bar can break free from its mounts and fly around the car during an impact, and by attaching the lap belts and ASM belts to the VAC floor mounts, the force of the impact is transmitted to the four floor mount bolts that secure the floor mount to the floor, potentially allowing the whole seat and harness assembly to break free. I think you could end up like a monkey on a test sled bouncing around the interior of the car.

I'm pretty certain most sanctioning bodies and club racing groups require that the shoulder harness straps be mounted to a fixed roll bar or cage, and that the lap belts and ASM belts be secured to the floor pan/chassis, with a welded plate on the other side of the floor pan.
__________________
IB E90 M3 ZCP returned to BMW FS
paradocs98 is offline   United_States
0
Reply With Quote
      02-10-2013, 12:21 AM   #10
Checkcaptain
Captain
 
Drives: BMW M3 E92
Join Date: Jan 2009
Location: Germany

Posts: 917
iTrader: (0)

Send a message via MSN to Checkcaptain Send a message via Skype™ to Checkcaptain
GTS also has welded brackets for the 6 point belt, plus rollbar.
Checkcaptain is offline   Germany
0
Reply With Quote
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
Forum Jump


All times are GMT -5. The time now is 04:53 AM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
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