Quote:
Originally Posted by c9ollie
I actually work at Takata and I test seatbelts and airbags. The submarining issue can be resolved with the addition of a 5th or 6th anti submarine strap. The issue that arrise with a full harness is the massive neck deflection that occurs in an impact. Most retractors today are an energy management type that pays out the belt in a controll manner to guide you into the airbag. When you are fully strapped in your body isn't allowed to move much. In an impact your torso stays still but your neck snaps forward. If you are going to run a harness I recommend a HANS device and a helmet. Those are impractical for street use. You could always keep both belts in the car. 3point for street and 4/5/6 point, HANS, and helmet for track.
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so 4 points work best when they are 5 or 6 points