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There are many questions regarding the installation of harnesses so we decided to offer some guidance with a few diagrams courtesy of SCHROTH .
Front Head Restraint "FHR" (HANS or Hybrid) are being used within many disciplines and as a result harness angles are being highlighted. In fact the correct harness angle is extremely important regardless of whether or not a FHR is being used. We see many cars built/manufactured with incorrect mounting positions, especially shoulder straps where they are mounted too low which can compress your back and cause spinal injury in the event of an accident. Here is some information which should help clear up any installation queries you may have.
Initial Restraint Adjustment during Installation While first installing your competition harness the following items may require minor adjustments to the belts.
Wrap Systems to roll bar installation and brackets assembly 3-bar slide wrap. This installation is commonly used for · shoulder strap roll cage installation · to assemble open strap ends to brackets. *Do not install a lap belt directly to a roll cage by wrap around technique. Installation steps: 1. slide the webbing through slot 1 and 2 as shown
2. make sure the protruding strap end is long enough to have sufficient webbing length available for the following wrapping procedure. A minimum of 360 – 400 mm (14” – 16”) is recommended.
3. the 3-bar slide shall be positioned as close as possible to either the roll cage bar or to the end bracket.
4. wrap the free strap end from underneath around the roll cage bar or through the webbing slot of an end bracket.
5. in case of the combination of a 50 mm bracket slot and 75 mm webbing, fold the webbing in as shown.
6. wrap webbing back through slot 2 and 1
7. fold strap end back and run it through slot 2 again.
8. make sure the strap end protrudes at least 100 mm (4“) or even longer from slot 2. If it is less than 100 mm disassemble and start over again. If longer, roll in the strap end and fix it by a cable tie to the shoulder belt.
9. Check again for proper shoulder belt tilt lock adjuster positioning and for the 3-bar slide to be as close as possible to the roll cage bar or end bracket.
Webbing should be crossed if the distance from the seat openings to the mounting bolt point or harness bar exceeds 450 mm (18”).
When mounting to a harness bar with a wrap mount and the distance to the bar from the seat is less than 450 mm (18”), a section of roll bar padding, fixed with cable ties, should be added to the outside of each of the shoulder harnesses to ensure that they cannot further separate when unloaded.
Bolt-in Wrap Bracket assembling Installation procedure 1. webbing shall wrap from the body facing side of bracket up into slot 1 2. pull through approx. 270 mm (11”) and fold down through slot 3 temporarily leaving 50 mm (2”) of slack
3. fold back up from the body side through slot 1 and back down through slot 2
4. fold back through slot 3 and finally through slot 1
5. pull the lap belt firmly to ensure the wrap is properly tight.
6. make sure the protruding strap end is at least 100 mm (4”) long
The webbing must be wrapped tightly!
Brackets for lap belt installation must either swivel [NASCAR requirement] or must be able to provide alignment during a crash. Therefore SCHROTH provides bolt-in brackets only with sleeved bushings for swiveling or alternatively special designed stainless steel brackets which can be aligned with the direction of pull at the time of installation.
If you require any further details please do not hesitate to contact us.
Initial Restraint Adjustment during Installation While first installing your competition harness the following items may require minor adjustments to the belts.
- Shoulder belt tilt lock adjusters must be positioned 250 mm (10”) below the collar bone or even lower.
- Shoulder belt angle from the top of the competitors shoulder to vehicle mounting point should be between 0 and 20 degrees.
- If a HANS® is worn, the adjuster must be positioned 70 mm on the yoke end of the HANS®.
- Lap belt tilt lock adjusters must not be positioned within the openings of the bucket seats. Adjusters must be either outside of the seat at a minimum distance of 40 mm (1.5”) from the opening or close to the rotary buckle inside the seat.
- Anti-sub strap tilt lock adjusters are recommended to be positioned either in the opening of the seat pan or right above. This position will allow adjustment without interfering in an uncomfortable manner with your upper thighs.
Wrap Systems to roll bar installation and brackets assembly 3-bar slide wrap. This installation is commonly used for · shoulder strap roll cage installation · to assemble open strap ends to brackets. *Do not install a lap belt directly to a roll cage by wrap around technique. Installation steps: 1. slide the webbing through slot 1 and 2 as shown
2. make sure the protruding strap end is long enough to have sufficient webbing length available for the following wrapping procedure. A minimum of 360 – 400 mm (14” – 16”) is recommended.
3. the 3-bar slide shall be positioned as close as possible to either the roll cage bar or to the end bracket.
4. wrap the free strap end from underneath around the roll cage bar or through the webbing slot of an end bracket.
5. in case of the combination of a 50 mm bracket slot and 75 mm webbing, fold the webbing in as shown.
6. wrap webbing back through slot 2 and 1
7. fold strap end back and run it through slot 2 again.
8. make sure the strap end protrudes at least 100 mm (4“) or even longer from slot 2. If it is less than 100 mm disassemble and start over again. If longer, roll in the strap end and fix it by a cable tie to the shoulder belt.
9. Check again for proper shoulder belt tilt lock adjuster positioning and for the 3-bar slide to be as close as possible to the roll cage bar or end bracket.
Webbing should be crossed if the distance from the seat openings to the mounting bolt point or harness bar exceeds 450 mm (18”).
When mounting to a harness bar with a wrap mount and the distance to the bar from the seat is less than 450 mm (18”), a section of roll bar padding, fixed with cable ties, should be added to the outside of each of the shoulder harnesses to ensure that they cannot further separate when unloaded.
3-Bar Adjusters pictured in the examples are not positioned next to the bar and the final locking portion of the wrap has not been completed. This will result in significant slippage through the adjuster and significantly more elongation of the shoulder belts.
Bolt-in Wrap Bracket assembling Installation procedure 1. webbing shall wrap from the body facing side of bracket up into slot 1 2. pull through approx. 270 mm (11”) and fold down through slot 3 temporarily leaving 50 mm (2”) of slack
3. fold back up from the body side through slot 1 and back down through slot 2
4. fold back through slot 3 and finally through slot 1
5. pull the lap belt firmly to ensure the wrap is properly tight.
6. make sure the protruding strap end is at least 100 mm (4”) long
The webbing must be wrapped tightly!
Eye Bolt installation for Snap-On and Carabine Brackets
Brackets for lap belt installation must either swivel [NASCAR requirement] or must be able to provide alignment during a crash. Therefore SCHROTH provides bolt-in brackets only with sleeved bushings for swiveling or alternatively special designed stainless steel brackets which can be aligned with the direction of pull at the time of installation.
If you require any further details please do not hesitate to contact us.