Menu toggle

Harness mounts

F

F355GTS

New member
I'd like to fit a set of harnesses in my 968 for trackdays, can you use the mounts that will be there for the rear lower seat belts as in the picture below or does it need to be something more bespoke

thanks

 
Just about but it will depend on your seat, ISTR some do use this arrangement. On my race car we had a set of mounts welded in a bit higher up and further back, almost onto the load deck.
 
The angle from the lower mounting points to the position in the seat will be too acute. There are suggstions that in a front end collision they can produce too much downward force causing damage to collar bones, also, i think it allows forward movement in extreme circumstances. This might help:

http://www.schrothracing.com/docs/Schroth_Installation_Checklist.pdf

Would suggest that you use a harness bar or half cage for appropriate mounting.

These are good products:

http://www.bkauto.com/porsche/r1020.php

Also consider what happens in a roll over and if you are wearing a standard road belt against the 'fixed' position from a harness with no roll cage!

Though about a CG Lock?

http://www.cg-lock.com/

Hope this helps, and sorry to be th purveyor of doom and gloom.

JP
 
Mark, As JP has said realy.
If you need any pics of the BK bar installed just ask..I have one in my car...
Dave W.
 
Dave

pics would be nice, thank you, I'm trying to keep the car unmolested but will buy trim pieces to replace any I have to drill/ cut
 
Thanks JP useful info there, that harness bar could work as it say's it uses factory fittings


Is there a (half) cage manufacturer that is preferred recommended?
 
Mark
The half cage that has been most widely used seemsd to be the Safety Devices version.
Its a "bolt in" type, although you will need to get some foot plates welded in to then bolt the cage too...
The BK bar is simply bolt in + out, theres no damaging of trim ..
See pics.

51ACE0124F654DF3A96F013C813B5776.jpg
 
Another pic.
The shoulder belts are connected to the bar . but the lap + crotch belts are fastened to the floor.
These pics were taken in my "old" 944S2. But the 968 is exactly the same.


693D93251D6D49469CE1526D2043CDCC.jpg
 
Mark, Another option i totaly forgot about,
is
a member of this very forum has had a "roll bar" made. By a VERY reputable cage manufacturing company.
Its a very good piece of kit. Its not just "knocked up " but has been made for a specific purpose + has passed the MSA scutineers.
He,s called ,PJS917, Pete Sherratt.
Its similar to the Safety Devices rear cage , with subtle differences.
I dont have a good pic of it, but im sure he,ll be along soon.[:D]
 
Another pic.
The shoulder belts are connected to the bar . but the lap + crotch belts are fastened to the floor.
These pics were taken in my "old" 944S2. But the 968 is exactly the same.
Click to expand...

Good grief [:eek:][:eek:][:eek:]

That is a harness GUIDE bar [see here] designed to create the correct angle for the shoulder belts behind the seat. It is not a harness bar.

The harnesses pass over the bar and must bolt to the mounts in the floor [&o]

 
Hey,,, chaps,,, come on,
What are you two talking about.????
Mike asked for ideas of fastening his harnesses . The rear seat belt mounts are too low causing too acute an angle.
So "we" came up with other alternatives...
Mainly THE ONLY alternatives out there....

Neil
I NEVER said it was a half cage...."roll bar" were my words...

Paul. Yes you are correct it is a harness guide bar , i didnt say it was anything else....The fact that I havnt fitted the harnesses to the bulkhead mounts is totaly up to me..
Have you used one of these bars.???
Trust me they are very solid bits of kit...
Ive had this one for a good 4 years or so + have had the belts fitted like this all the time. There is NO flex or give in the bar... OK so i maybee havnt fitted the belts in full acordance with item description, but there isnt any instructions when you get the bar.. So i guess you can fit them however you want...
I certainly feel safe with it...
 
Paul. Yes you are correct it is a harness guide bar , i didnt say it was anything else....The fact that I havnt fitted the harnesses to the bulkhead mounts is totaly up to me..
Have you used one of these bars.???
Trust me they are very solid bits of kit...
Ive had this one for a good 4 years or so + have had the belts fitted like this all the time. There is NO flex or give in the bar... OK so i maybee havnt fitted the belts in full acordance with item description, but there isnt any instructions when you get the bar.. So i guess you can fit them however you want...
I certainly feel safe with it...
Click to expand...

Sorry, I wrote without proper consideration and dont mean to offend or criticise.

In my view the bar is fine as a guide bar but what you have to imagine is two normal weight adults in a frontal will weigh (guessing based upon air bags firing at around 10G) the equivalent of at least 0.6 to 0.7 tonnes EACH very momentarily or probably more in a heavy shunt.

Ergo despite how it looks you will then realise the centre will move forward or fail as the 1.2 - 1.4 tonnes exerted momentarily/snatch loaded (albeit spread a bit) will definitely bend it. Stainless isnt as tensile as steel so it is probable it will fracture too.
 

Paul. Yes you are correct it is a harness guide bar , i didnt say it was anything else....The fact that I havnt fitted the harnesses to the bulkhead mounts is totaly up to me..
Have you used one of these bars.???
Trust me they are very solid bits of kit...
Ive had this one for a good 4 years or so + have had the belts fitted like this all the time. There is NO flex or give in the bar... OK so i maybee havnt fitted the belts in full acordance with item description, but there isnt any instructions when you get the bar.. So i guess you can fit them however you want...
I certainly feel safe with it...
Click to expand...

As Dave has re-iterated I don't think he has said that this replaces a cage. I had one these fitted to my 968 and I have to say that it is better made and a better fit than a Safety Devices half cage I have had previously fitted on a 968. When Peter had these made they used his car for the initial template and the fit of these is utter precision, using factory mounting points. They are a great way of securing your harnesses and although not a roll cage would certainly give you protection in the event of a crash.
 
I spoke to the UK distributor yesterday and he says it is a guide bar and Harnesses should be mounted to the normal car points not the bar. It creates a problem in the CS as the GF shelf that replaces the rear seats would be in the way for the harnesses to come up to the bar and equally if the bar is not strong enough and therefore possibly give in an accident then the harnesses will be useless as they would allow substantial forward travel, time to consider a cage maybe :hmm:
 
With all the question you have been asking recently it sounds to me like its time to call EMC motorsport in Birmingham, Kev will sort you out.
 
You must log in or register to reply here.

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Porsche
Lockton
Pirelli
Officially approved
Oracle Finance
WEX Esso
Collecting Cars
Archant Dialogue
Back
Top