I have the team Techs in my Gen 3 (6 point). When I first installed them, I initially adjusted them with the "V" of the crotch strap very close to the mother lode. I did a couple of high speed twisty auto crosses and found out very early from the side to side motion that the lap and crotch belts were adjusted too low. I re-looked at the instructions, readjusted and now I am confident I wont have the same problem.
On another note, I was always told if you have a 5 point harness, the crotch strap needs to be as vertical as possible and that is why the racing seats have the slot cut into them in the seat base so that the crotch strap can come up through. On a street car seat, the strap goes out horizontally a ways before going down to the floor. This will allow "some" submarining before being "caught" by the crotch strap. The amount will vary depending on the person and the seat design.
Additionally, There is also seat crush or deformity to worry about during an impact with the crotch strap. What I mean is a person will have the harness adjusted tight statically. In a collision or wreck the seat will deform around the front edge where the crotch strap makes the bend from horizontal to vertical because of the significant forces exerted during a crash.
I have seen this on several occasions when I worked racing events as a paramedic. Again I want to stress these were on OEM seats and not purpose built racing seats.
Thanks for listening.
Steve
