Outer Limits 4x4 Board

hey guys as you can see from the photo i can't mount the harness on a 45 degree angle or within it
i was thinking of mounting a piece of angle just below the window and mounting the harness to that it will be greater than 45 degrees are they strict on this in comps?
if so how should i mount it

regardless of how strict they are at comp inspections you should not skimp on this area of design !!! You will suffer spinal injuries if you have the angle too steep.

real answer to your problem IMHO is a internal cage with rear cross braces that can also double for mounts for your harness if planning comp work you will need the cage anyway just do it all at once and do it right the 1st time

how bout a piences of say 50 x5 flat bar with 3 m10 holes in it on the outside of the cab then on the inside 3 spacer of 50x5 with a hole in each and then another plate the same as the outside, then bolt em all thoghter though the wall of the cab and run the harness strap down between the spacers and bolt the harness to the floor, afaik this is the setup ruff used in his green hilux and thats what i plan to use in my truck

spazbot wrote:how bout a piences of say 50 x5 flat bar with 3 m10 holes in it on the outside of the cab then on the inside 3 spacer of 50x5 with a hole in each and then another plate the same as the outside, then bolt em all thoghter though the wall of the cab and run the harness strap down between the spacers and bolt the harness to the floor, afaik this is the setup ruff used in his green hilux and thats what i plan to use in my truck

any pics?

nope i could make a very average drawing

i was going to drill and mount a flat peice on steel to the inside and the outside of the cab and drill straight through the steel and cab mount would be just above the window and looking at yours would be better then a 45 degree angle

The most critical thing about mounting a harness is that the anchor point is above the slot in the seat that the harness comes through , that is why they tell you 45 degrees , if it is below you are relying on the strenghth of the seat ,

ie: if you mount it below the slot say midway down the back of the seat , you will break your seat in half in a case of serious impact , and then yes as mentioned above sreious spinal injuries as it wants to drive you into the floorpan.

I would try and mount it as high as posssible not below.

spazbot wrote:how bout a piences of say 50 x5 flat bar with 3 m10 holes in it on the outside of the cab then on the inside 3 spacer of 50x5 with a hole in each and then another plate the same as the outside, then bolt em all thoghter though the wall of the cab and run the harness strap down between the spacers and bolt the harness to the floor, afaik this is the setup ruff used in his green hilux and thats what i plan to use in my truck

yeah mate even a dodge pic be good

roberts wrote:i was going to drill and mount a flat peice on steel to the inside and the outside of the cab and drill straight through the steel and cab mount would be just above the window and looking at yours would be better then a 45 degree angle

i don't see how mounting it above the window is any better they say your harness should be out straight from the back or within 45 degrees towards the floor not going up

or maybe i miss read it

The harness should pull you down into the seat slightly, if it is angled up from the seat there is the chance you will be loose in the vertical plane
They say you should cross your arms to the opposite side of the steering wheel and that is the correct seat mounting position.
You should be able to be firmly belted in and still comfortable enough to read a book for 1/2 an hour or so. If the seating positions not right it is another niggle to put you off being your best, especially in a comp truck.
J Top

The CAMS manual states that the belts should be mounted at least 150 mm behind the seat (if practical of course), and preferably between 0 & 10 degrees below horizontal. When viewed from above the car, the belts shouldn't angle out more than 20 degrees from the centreline of the seat.

Floor mountings should be re-inforced by a 75mm x 50mm (by 5mm thick I suppose) plate below the floorpan too.

Obviously a rollcage is THE way to go, but if drilling through the cab, I would brace it with a piece of 50 x 5mm angle iron, along the width of the cab, so it won't pull through.

As said above, don't take shortcuts with this. The forces generated in an accident are fearsome......

behind the seat there is plenty of room for a bar at the right height so either run a bar left to right across the window at the correct height and weld it with a nice bit of reinforcement 3mm steel welded to the sides first to spread the load with maybe a bar from bellow the window to above it in the middle.
{ . .}
window top I I
/---------------------------I I---------------------------------\
/ I I \
I I I I
Irun the bar across at the right height and put you harness over itI
I I
\---------------------------I I----------------------------------/
I I
{. .}
window bottom




or run 4 vertical bars with a horizontal bit between at the right height.
{ . .} { . .} { . .} { . .}
I I I I I I I I
/---------------------------------------------------------------\
/ I I I I \

I bar to other I I I I bar to other I I

\------------------------------------------------------------------/
I I
{ . .} { . .} { . .} { . .}




both ways just bolt to the floor.

hope that helps

bru

I've got mine running over the top of a horizontal bar as part of the roll cage thats level with the shoulders. The harness straps then run down and mount onto tabs that are welded on another horizontal bar just above the floor. This provides a solid mounting point and having it run over a bar at shoulder height removes some of the force on the mounting points as well.

toughnut wrote:I've got mine running over the top of a horizontal bar as part of the roll cage thats level with the shoulders. The harness straps then run down and mount onto tabs that are welded on another horizontal bar just above the floor. This provides a solid mounting point and having it run over a bar at shoulder height removes some of the force on the mounting points as well.

sounds like a good idea