4 Point Harness w/out Harness Bar?

Kgolf31 · 10-27-2012, 04:58 PM

Is there any mounting bolts that we can secure a 4-point harness to for Auto-x? A local was showing me his harness mounting bolt in his GT3 that he discovered and I didn't know if there was anything similar.

mfanatic325 · 12-01-2012, 11:43 PM

I don't think there's such a mounting point for the Z4s. Maybe the child safety lock points on the passenger side might suffice, but it'd be kinda risky I think. Better to get an actual bar at the very least, if not a half to a full cage.

Beedub · 12-02-2012, 09:50 AM

funny.... i was wondering this same thing.... i saw a 1M at my local event and he fitted some bolt down eyelets to the seat mount points and attached them their... im not sure if this is legal or not.

mfanatic325 · 12-02-2012, 03:16 PM

Quote:

Originally Posted by Beedub

funny.... i was wondering this same thing.... i saw a 1M at my local event and he fitted some bolt down eyelets to the seat mount points and attached them their... im not sure if this is legal or not.

If we had back seats, we could potentially use the rear seatbelt receptacles as some form of mounting

beta · 12-02-2012, 03:17 PM

From what I understand you should only run a 4-point if you have a cage.

Otherwise in a roll-over the 4 point will keep you upright into to the collapsing roof/windshield. The hack went into it a bit here.

Beedub · 12-02-2012, 03:26 PM

Quote:

Originally Posted by mfanatic325

If we had back seats, we could potentially use the rear seatbelt receptacles as some form of mounting

no no no.... his bolted straight down to the floor, they looped over the tops of the seats and was bolted down to where the runners are bolted to the floor..... like i say, i have no idea if this is sufficient in terms of safety.

Kgolf31 · 12-02-2012, 03:38 PM

Quote:

Originally Posted by Beedub

no no no.... his bolted straight down to the floor, they looped over the tops of the seats and was bolted down to where the runners are bolted to the floor..... like i say, i have no idea if this is sufficient in terms of safety.

Yea, that's a no-go.

You need to maintain a certain angle in relation to the seat for the straps behind the seats

mfanatic325 · 12-03-2012, 12:57 AM

Quote:

Originally Posted by Kgolf31

Yea, that's a no-go.

You need to maintain a certain angle in relation to the seat for the straps behind the seats

Yup, the two shoulder straps cannot pull downwards on you.

007MCoupe · 12-03-2012, 04:36 AM

how much does a harness bar typically cost? a half cage?

Kgolf31 · 12-03-2012, 11:21 AM

The main reason I asked this, is that I need to maintain class rules for SCCA Solo.

mfanatic325 · 12-03-2012, 01:13 PM

Quote:

Originally Posted by 007MCoupe

how much does a harness bar typically cost? a half cage?

For a custom harness bar only, you're looking at upwards of $350 for materials and labor. If you want a half cage, that'll probably bump up to $500. And for full cage, depending on bolt in or weld in, I wouldn't be surprised if it went all the way up to $1,500 or more; as there's lots of labor involved.

SmartBastard · 12-04-2012, 04:26 AM

Hmm I newer looked into this so spare me some slack if this is a retarded idea, but couldn't you just get a rear strut bar and mount the harness there? Or is the rear strut bar not strong enough for that?

Can't find any Z4M rear strut bar, but what I mean is smth like this:

mfanatic325 · 12-04-2012, 05:01 AM

I suppose that might actually suffice as a shoulder strap bar. However, one would need to strip out everything behind the seats in order to get at the bar. Also, there's still the issue of the angle of the shoulder straps to where it's actually wrapped around/mounted. But interesting thought process there. I've never thought of using a rear strut bar for such a purpose

AUTOX08MC · 12-04-2012, 11:54 AM

I believe a full roll cage, or partial roll cage/bar is permitted in any class of SCCA autocross.

Kgolf31 · 12-04-2012, 01:15 PM

Quote:

Originally Posted by AUTOX08MC

I believe a full roll cage, or partial roll cage/bar is permitted in any class of SCCA autocross.

I will have to check, but I'm almost positive not.

You increase the stiffness of the chassis.

AUTOX08MC · 12-04-2012, 01:49 PM

From the rulebook:
3.3.2 Roll Bars
Roll bars or roll cages are strongly recommended in all cars.

10-27-2012, 04:58 PM	#1
Kgolf31 Lieutenant Colonel Drives: 2007 Z4MC, 2012 128i Join Date: Sep 2008 Location: Ohio Posts: 1,518 iTrader: (2)	4 Point Harness w/out Harness Bar? Is there any mounting bolts that we can secure a 4-point harness to for Auto-x? A local was showing me his harness mounting bolt in his GT3 that he discovered and I didn't know if there was anything similar. __________________ 07 Z4M Coupe: 235/265 Hankook RS3, H&R E46 M3 30mm Front Sway Bar, Hawk HP+ Pads, Vorshlag Wheel Stud Conversion 12 128i Coupe: Stock, for now
	Tweet

12-01-2012, 11:43 PM	#2
mfanatic325 ///M-fanatic Drives: '07 Z4MC, '04 325Ci Join Date: Oct 2007 Location: Cupertino, CA. Posts: 3,326 iTrader: (18) Garage List 2007 BMW Z4M Coupe [4.45]	I don't think there's such a mounting point for the Z4s. Maybe the child safety lock points on the passenger side might suffice, but it'd be kinda risky I think. Better to get an actual bar at the very least, if not a half to a full cage. __________________ VF570 S/C\|TIAL BOV\|SetRabCooler\|Brembo GT 6/4\|TE37s\|NT05s\|3.91 Gearing\|TCK D/A\|RPi Induction\|SS Race Mufflers/X-pipe\|JVT Headers\|AS SSK\|Sparco Pro2000/6pt.Harness\|MS FloorMounts\|SE Custom Harness Bar\|Tekarbon Angels\|M-Tech Pedals\|OE Strut Bar\|RE RSMs\|8000K D2S\|CDV DEL\|CF Roof Wrap\|MB Grills\|UUC TrannyMounts/ClutchStop\|V1 Mount\|P3C Gauge

12-02-2012, 09:50 AM	#3
Beedub Brigadier General Drives: 2007 Z4 M roadster vt2-500 Join Date: Sep 2007 Location: UK Posts: 3,057 iTrader: (0)	funny.... i was wondering this same thing.... i saw a 1M at my local event and he fitted some bolt down eyelets to the seat mount points and attached them their... im not sure if this is legal or not. __________________ Pristine Bi-colour Ti /Bsm...z4m roadster Ess vt2-500....Perfection on wheels.

12-02-2012, 03:17 PM	#5
beta Major Drives: 2006 M Roadster Join Date: Mar 2011 Location: CA Posts: 1,408 iTrader: (1)	From what I understand you should only run a 4-point if you have a cage. Otherwise in a roll-over the 4 point will keep you upright into to the collapsing roof/windshield. The hack went into it a bit here. __________________ modification journal

12-03-2012, 04:36 AM	#9
007MCoupe Major Drives: das Bierwagen Join Date: Jun 2010 Location: the 'Ring Posts: 1,325 iTrader: (4) Garage List 2007 Z4 M Coupe [0.00]	how much does a harness bar typically cost? a half cage? __________________ RPI scoop///VB3///75mm wheel studs//////Stubby///GoMiniGo///GC front sway bar///AKG Engine Mounts///AKG Trans Mounts///SS brake lines Harris Hill Road, LVMS, Ring...

12-03-2012, 11:21 AM	#10
Kgolf31 Lieutenant Colonel Drives: 2007 Z4MC, 2012 128i Join Date: Sep 2008 Location: Ohio Posts: 1,518 iTrader: (2)	The main reason I asked this, is that I need to maintain class rules for SCCA Solo. __________________ 07 Z4M Coupe: 235/265 Hankook RS3, H&R E46 M3 30mm Front Sway Bar, Hawk HP+ Pads, Vorshlag Wheel Stud Conversion 12 128i Coupe: Stock, for now

12-04-2012, 04:26 AM	#12
SmartBastard Stupid as shit Drives: '08 M Coupe Join Date: Jan 2011 Location: Vienna, Austria Posts: 363 iTrader: (0)	Hmm I newer looked into this so spare me some slack if this is a retarded idea, but couldn't you just get a rear strut bar and mount the harness there? Or is the rear strut bar not strong enough for that? Can't find any Z4M rear strut bar, but what I mean is smth like this:

12-04-2012, 05:01 AM	#13
mfanatic325 ///M-fanatic Drives: '07 Z4MC, '04 325Ci Join Date: Oct 2007 Location: Cupertino, CA. Posts: 3,326 iTrader: (18) Garage List 2007 BMW Z4M Coupe [4.45]	I suppose that might actually suffice as a shoulder strap bar. However, one would need to strip out everything behind the seats in order to get at the bar. Also, there's still the issue of the angle of the shoulder straps to where it's actually wrapped around/mounted. But interesting thought process there. I've never thought of using a rear strut bar for such a purpose __________________ VF570 S/C\|TIAL BOV\|SetRabCooler\|Brembo GT 6/4\|TE37s\|NT05s\|3.91 Gearing\|TCK D/A\|RPi Induction\|SS Race Mufflers/X-pipe\|JVT Headers\|AS SSK\|Sparco Pro2000/6pt.Harness\|MS FloorMounts\|SE Custom Harness Bar\|Tekarbon Angels\|M-Tech Pedals\|OE Strut Bar\|RE RSMs\|8000K D2S\|CDV DEL\|CF Roof Wrap\|MB Grills\|UUC TrannyMounts/ClutchStop\|V1 Mount\|P3C Gauge

12-04-2012, 11:54 AM	#14
AUTOX08MC Enlisted Member Drives: 08 Z4m Coupe Join Date: May 2011 Location: Indianapolis Posts: 37 iTrader: (0)	I believe a full roll cage, or partial roll cage/bar is permitted in any class of SCCA autocross. __________________ 08 Z4 MC, Arctic White, GC Suspension 650/800, GC Swaybars (med/soft), Remus Cans, SS Lines, BMW Strut Brace, TC Cline RTAB, RPI Scoop, Stock Wheels w/ Dunlop Star Specs 245/275, Autocross Wheels: Apex 18x9.5 18x10 all w/285/30 A6 Hoosiers, Fabspeed Headers, Evolve Tune, Aluminum Adjustable Rear Camber Arms

12-04-2012, 01:49 PM	#16
AUTOX08MC Enlisted Member Drives: 08 Z4m Coupe Join Date: May 2011 Location: Indianapolis Posts: 37 iTrader: (0)	From the rulebook: 3.3.2 Roll Bars Roll bars or roll cages are strongly recommended in all cars. __________________ 08 Z4 MC, Arctic White, GC Suspension 650/800, GC Swaybars (med/soft), Remus Cans, SS Lines, BMW Strut Brace, TC Cline RTAB, RPI Scoop, Stock Wheels w/ Dunlop Star Specs 245/275, Autocross Wheels: Apex 18x9.5 18x10 all w/285/30 A6 Hoosiers, Fabspeed Headers, Evolve Tune, Aluminum Adjustable Rear Camber Arms

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