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The mkiv Supra Owners Club

how to install 3 points harness?


China Man

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I got the seats and now waiting for the base to have it install.

 

i am thinking of installing a 3 points harness but not sure where the top point attached to??

 

I have seen some install like Peter Sharp's car with a harness bar, is that the only option??

 

I like the look of the harness bar and I can mount my DV cam there for track days but I find it really stupid to have bought the recline seat and runner but can't have access or use of the back seats :p

 

Can the normal seat belt top mount be used? I read somewhere on the forum that it can cause stress and spinal injury.

 

Many thanks

 

China

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This is my 4 point. It's all bolted to the chassis using threaded anchor plates. The shoulder straps go over the bar in the bas of the rear seat back and then attach to the floor just behind it. It all folds into the boot when not needed.

 

strict angles and lengths for the fixing of any racing harnesses
Only applicable if you are racing under MSA regs. It's worth complying with race regs if you can, but common sense and some thought are all you really need if you're doing track days.

Harness 1.JPG

Harness 2.JPG

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I think anyone is crazy to use harnesses without mounting them properly. If the angle of the shoulder belts is more than a bit below horizontal it can compress your spine and do serious damage in an accident. If the belts are too long they will stretch in an impact. Without an anti-sub belt the waist belt can pull up in a crash, potentially into the soft tissue above your waist, which is going to be very serious. Normal belts don't do this because as the shoulder belt tightens it pulls the lap belt towards you. So you must have all the belts absolutely tight.

 

If you don't mount them properly they are much more dangerous than normal seatbelts. Strut braces are no where near strong enough, the rear belt points are too low. Use a harness bar and a proper 5 or 6 point harness is my advice.

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Provided the anchor points are mounted to something that won't break in an accident, it doesn't matter what they're fixed to. Personally I thing the chassis of the car is strong enough. The issue of strap angles is defined in the RAC Blue Book. Has anyone got one and can upload the relevant diagram?

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You can't use more than 4 point with a standard seat.

 

Yeah but the standard seats have no shoulder harness slots anyway, so you shouldn't be using harnesses at all with them. I had my standard Recaros modified & retrimmed so they have slots in the base for the anti-sub straps.

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