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03-19-2009, 05:53 PM #1
3 Point Seat Belts -vs- 4 Point Harness
So I am at a point in my build that I need to decide if I want to go with the 3 point seat belts like the ones from Morris Classic Concepts or a 4 point harness that requires a roll cage to be welded in. My car will see some Auto-X, but 90% of the time it will be street driven. Comfort is an important factor for me with this build and I have been searching to find something that will give me the best of both worlds.
3 Point Belt from Morris
My dilemma with a 4 point harness is you are physically locked in. Once you’re buckled up, your upper torso will have very little movement. That’s fine for the track, but I would prefer a little “slack/comfort” in the safety belts when I am cruising around town. If I wanted to lean forward to open the glove box, I would need to unbuckle first.
But then I came across these 3 point harnesses made by Schroth. Below is a portion of their description of their S.M.A.R.T. restraint system.
S.M.A.R.T.™ (Sensor Modulated Automatic Restraint Technology) represents the most advanced design in restraint systems today. The system features a unique 'thinking' electro-sensor which constantly monitors abnormal movement and force inside the vehicle while in motion. During normal driving conditions, the Autocontrol's sensor allows the inertia reel to 'relax', enabling occupants to move more comfortably and freely in their harnessbelts. But, if the electro-sensor detects rapid acceleration or deceleration, a high G-force turn, quick side movement or inclines over 25 degrees, it will INSTANTLY lock the inertia reel and secure occupants in their seats - the safest possible position in a collision.
They also have a cutoff switch that puts the seat belts into “lock down mode” that would be great at the track.
The Cutoff switch is designed to be wired into the inertia reel. When switched, the reel will be locked and the harness will be static. When open, the reel functions normally. A functioning motion sensor is imperative for this to be a safe installation.
The first thing I noticed with the Schroth harness is that the mounting point behind the shoulders would require the “cross bar” roll cage bar to be set back further to accommodate the roll control mechanism. Other than that, I think I like this set up.
So I wanted to post this up and see if anyone had any experience with them or if any forum members had any comments.
" Better to Be Lucky than Good "
03-19-2009, 07:03 PM #2