**HOW TO** Install 4-point harness


stevenEK9

trackattack
Joined
Mar 11, 2007
Messages
4,255
Seems to have come up a fair bit and was asked for a few pics so thought I would fire up a how to........

What you will need....

-Harness
-3 x short eye bolts
-1 x long eye bolt
-14mm socket/ratchet
-adjustable spanner

Remove rear seat belt, tbh if you are looking to run a harness I wouldn't advise running rear seats at all

Install 2 short eye bolts where the rear seatbelt was mounted, use the adjustable spanner to tighten up the eyebolts so they are secure. Pic of these installed



Now clip your harness shoulder straps and be sure to criss cross them and run them through the harness holes on your seat. Blue book rules stipulate for safety reasons that if the mounting points are a certain distance from the seat then the harness should be crossed, ek9 is beyond this distance hence why you should criss cross. Pic of the shoulder straps in place



Next up, install the remaining short eyebolt to the seat subframe where the bolt normally secures your oem seatbelt buckle. IF you want to run your oem seatbelt too then just remove the bolt and replace with your eyebolt, simple! Or if you are removing the oem belt as I have then just remove the buckle and install the eye bolt, again use the adjustable spanner to make sure this is secure. Clip the lap strap in and should look like this



Lastly install the long eyebolt to the bottom fixing point for the oem seatbelt where it bolts to the sill, making sure to use all the oem spacers that the bolt runs through. You can take this oportunity to remove the oem seatbelt if you like, if not then just secure the belt back in with the eyebolt. When you are done and clipped in the remaining lap strap it should look like this




Obviously this is just a guide, I don't take any responsibility for your workmanship, although tbh it is a simple task and you would have to be a mong to get it wrong :nice:

Last up make sure that when you are adjusting the seatbelt, none of the straps are twisted, then:

-buckle up the lap strap, pull the straps TIGHT making sure the buckle is still centred
-buckle up the shoulder straps and then pull them tight, I find rocking back and forth settles the belt in place so you can tighten these further and thats you secure

Enjoy some added hold and safety




If you are serious, can improve the harness further by installing a harness bar, these run behind the 2 front seats, the harness straps run over the top of it, as a result the shoulder straps run at a straighter angle into the back of the seat thus improving safety in event of a crash.

Also there is limited adjustability in the lap strap that mounts to the seat subframe, it would be preferable to have a spreader plate welded to the exhaust tunnel in line with the rear of the handbrake, although not essential as you can see in the pics

Cheers
Steven
 


EK9dan

B18C-R EK9
Donator
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Sep 23, 2008
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2,545
very very helpful Steven! Thanks very much :) :)

PS, it wont let me give you rep again! I need to spread it around apparently.
 



Lee s

Moderator
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Jun 28, 2010
Messages
4,356
many thanks, however do you know how to do this with the std seat?
 


FreakyParts

Member
Joined
May 7, 2010
Messages
847
It may be worth noting that it's not recommended to have more than a 20 degree angle on the tails from the horizontal as it increases the risk of spinal compression injuries in the event of an accident.
This is recommended by both the FIA and the harness manufacturers.



Taken from the Schroth Harness installation manual here
 


PaulJ

Member
Joined
Jul 1, 2009
Messages
471
Good idea this :) Such a simple thing that seems to get asked a lot about!
 


Burnie1000

JDM DC2 Type Rx
Joined
Sep 9, 2007
Messages
268
Do you think you'll also fit the crotch strap to turn it into a 5 point harness and stop submarining?
 



MatD

Member
Joined
Mar 21, 2010
Messages
489
It is so simple, didn't know you over a certain distance, your suposed to cross the harness though, honestly thought it was for looks!
 




darkside

Member
Joined
Oct 18, 2008
Messages
153
Nice 'How To'

I used this when looking at fitting the harness in mine. I managed to use a short bolt with the plastics in place though
 


NeilVtec

Chuck Norris
Joined
Oct 17, 2008
Messages
2,241
i also used a short bolt with plastics still in place, just bent them in a little bit! lol
 



c2bdb

Member
Joined
Mar 5, 2010
Messages
130
what have you guys done regarding the seatbelt light after fitting harnesses?
 



R883

--EK9 in Progress--
Joined
Oct 1, 2008
Messages
580
I assume if you were to use a spreader plate on the tunnel you would need another short one ?

Anyone got any pics of one installed this way ?
 


stevenEK9

trackattack
Joined
Mar 11, 2007
Messages
4,255
Seatbelt light stays off when you unplug the wiring for it under the seat :nice:

Yeah i used a short eyebolt on the exhaust tunnel as i have since moved the eyebolt to there. I made up small spreader plates from 6mm steel and secured the eyebolts with 7/16" UNF nylocs
 


Lee s

Moderator
Staff member
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Jun 28, 2010
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the eyebolt by the handbrake wont fit with a std recaro.
 


wishy

Playing with Boats
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Feb 23, 2010
Messages
2,943
the eyebolt by the handbrake wont fit with a std recaro.
I ended up taking the seat out to fit this one in and a bit of pushing and grunting to get it back in again Lol
 


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