Seat Harnesses

adamste · 04-23-2019, 12:45 PM

When I hit the local track last month I noticed that my seatbelts did not restrain me at all. The instructor suggested I install seat harnesses. I saw there were some that are bolted onto the floor and some onto rollbars. Not sure how secure the bar is behind my seats. Any suggestions? 4 point, 5 point, installation.

Chuck33079 · 04-23-2019, 12:50 PM

The bar behind the seats is for decoration only. If you value being alive and unparalyzed, do not use it for harnesses.

BettyZ · 04-23-2019, 02:24 PM

A 4 point is a great way to end up scrunched into a fleshy, leaking ball in the driver footwell. 5 point is called "the castrati" for a reason.

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sx moneypit · 04-23-2019, 02:47 PM

Harness Bar Installed. :)

BettyZ · 04-23-2019, 04:51 PM

FWIW, trying to mount a 2-point sub strap through the floor is a f*cking nightmare. The underbody isn't flat enough for those big ole washers to lay properly. Ended up with a nice mounting hole in my floorplan before I took another route. Ended up welding a crossbar under my sparco seat frame, wrapped the sub straps around that.

Mounting eyebolts for the waist belts is fairly straightforward, screw one into the stock seatbelt hole. Drill a hole through the transmission hump directly opposite the stock belt hole. Coat one side of the mounting washer with silicone sealant. Put that side facing the metal of the hump, under the car.

For shoulder belts I went the less $ route and got a cipher harness bar for ab 100 bucks. Intend on upgrading to MA Motorsports or some other 1 piece bar in the future.

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Jmatchley86 · 04-23-2019, 08:02 PM

This is another option that is wayyyyy less on cost and effort. CG Lock is a locking mechanism that holds the lap portion as tight as you want it to be. I'm a huge 250lb guy and it held me really well.

its 60$ is vs quite a bit more on a harness and bar. Also don't go 4 point unless its a scroth asm system.

BettyZ · 04-23-2019, 11:07 PM

Quote:

Originally Posted by Jmatchley86

This is another option that is wayyyyy less on cost and effort. CG Lock is a locking mechanism that holds the lap portion as tight as you want it to be. I'm a huge 250lb guy and it held me really well.

its 60$ is vs quite a bit more on a harness and bar. Also don't go 4 point unless its a scroth asm system.

Agreed on never going 4 point. As for the CG lock, to each their own. What sticks in my mind is that a 3-point seatbelt was a design compromise between safety and convenience/comfort - if it was too cumbersome and restraining people wouldnt wear it, hence the compromise. I like a higher level of safety.

And before anyone gets on my *** ab "if you roll while wearing a harness without a roll cage the roof will snap your neck," I'm 6'4 and if I roll I'm a quadriplegic regardless of what restraint I'm wearing lol

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Jmatchley86 · 04-24-2019, 08:01 PM

Totally fell you on the height issue. I'm 6'3 and just finished removing my headliner for a bit of extra room when my helmet is on!

BettyZ · 04-24-2019, 09:19 PM

Lol I did that on my 350. For the 370 I had to custom-weld a seat bracket for my sparco. The seat literally cannot be lower to the floorpan or farther back from the wheel. Took the seat cushion out and shaved it down by half an inch as well.

And I still had to get a new helmet to clear the roof lol

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04-23-2019, 12:45 PM	#1 (permalink)
adamste Base Member Join Date: Jun 2011 Location: Frisco, Texas Posts: 8 Drives: 18 Pearl White Nismo Rep Power: 13	Seat Harnesses When I hit the local track last month I noticed that my seatbelts did not restrain me at all. The instructor suggested I install seat harnesses. I saw there were some that are bolted onto the floor and some onto rollbars. Not sure how secure the bar is behind my seats. Any suggestions? 4 point, 5 point, installation.

04-23-2019, 12:50 PM	#2 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29538	The bar behind the seats is for decoration only. If you value being alive and unparalyzed, do not use it for harnesses. Rusty, Hotrodz, madwi and 4 others like this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

04-23-2019, 02:24 PM	#3 (permalink)
BettyZ A True Z Fanatic Join Date: Aug 2018 Location: Chicagoland Age: 37 Posts: 5,261 Drives: A Garage Queen Rep Power: 2684370	A 4 point is a great way to end up scrunched into a fleshy, leaking ball in the driver footwell. 5 point is called "the castrati" for a reason. Sent from my SM-G955U using Tapatalk __________________ '14 MB Nismo \| Boost Lab 6870 1.32 AR 553 HP / 471 ft.-lbs. Betty Mods

04-23-2019, 04:51 PM	#5 (permalink)
BettyZ A True Z Fanatic Join Date: Aug 2018 Location: Chicagoland Age: 37 Posts: 5,261 Drives: A Garage Queen Rep Power: 2684370	FWIW, trying to mount a 2-point sub strap through the floor is a f*cking nightmare. The underbody isn't flat enough for those big ole washers to lay properly. Ended up with a nice mounting hole in my floorplan before I took another route. Ended up welding a crossbar under my sparco seat frame, wrapped the sub straps around that. Mounting eyebolts for the waist belts is fairly straightforward, screw one into the stock seatbelt hole. Drill a hole through the transmission hump directly opposite the stock belt hole. Coat one side of the mounting washer with silicone sealant. Put that side facing the metal of the hump, under the car. For shoulder belts I went the less $ route and got a cipher harness bar for ab 100 bucks. Intend on upgrading to MA Motorsports or some other 1 piece bar in the future. Sent from my SM-G955U using Tapatalk __________________ '14 MB Nismo \| Boost Lab 6870 1.32 AR 553 HP / 471 ft.-lbs. Betty Mods

04-24-2019, 08:01 PM	#8 (permalink)
Jmatchley86 Base Member Join Date: Jan 2017 Location: Fort Worth Posts: 159 Drives: 2011 370z 6MT Rep Power: 8	Totally fell you on the height issue. I'm 6'3 and just finished removing my headliner for a bit of extra room when my helmet is on! BettyZ likes this.

04-23-2019, 02:47 PM	#4 (permalink)
sx moneypit Premium Member Join Date: Oct 2014 Location: Memphis,Tn. Age: 67 Posts: 3,279 Drives: 2010 370Z PG 6 spd Rep Power: 2684370	Harness Bar Installed. :)

04-23-2019, 08:02 PM	#6 (permalink)
Jmatchley86 Base Member Join Date: Jan 2017 Location: Fort Worth Posts: 159 Drives: 2011 370z 6MT Rep Power: 8	This is another option that is wayyyyy less on cost and effort. CG Lock is a locking mechanism that holds the lap portion as tight as you want it to be. I'm a huge 250lb guy and it held me really well. its 60$ is vs quite a bit more on a harness and bar. Also don't go 4 point unless its a scroth asm system.

04-24-2019, 09:19 PM	#9 (permalink)
BettyZ A True Z Fanatic Join Date: Aug 2018 Location: Chicagoland Age: 37 Posts: 5,261 Drives: A Garage Queen Rep Power: 2684370	Lol I did that on my 350. For the 370 I had to custom-weld a seat bracket for my sparco. The seat literally cannot be lower to the floorpan or farther back from the wheel. Took the seat cushion out and shaved it down by half an inch as well. And I still had to get a new helmet to clear the roof lol Sent from my SM-G955U using Tapatalk __________________ '14 MB Nismo \| Boost Lab 6870 1.32 AR 553 HP / 471 ft.-lbs. Betty Mods

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