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Eliza
Joined: 17 Aug 2015 Posts: 174 Location: Prov. Utrecht, The Netherlands
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Posted: Wed Aug 22, 2018 2:30 pm Post subject: Seatbelt upper mounting point/B-pillar |
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Good morning all,
I need the accumulated wisdom and in-depth knowledge of the board .
I hate it how the stock seatbelt grazes the side of my neck in summer, when wearing just a T-shirt. I am considering a lower, static mounting point.
Is this doable? I want to ensure safety isn't compromised. I know there are weld-in nuts, just not certain how these would be placed, and would the B-pillar be strong enough after placement?
Anyone else have that same issue and come up with a solution?
Fire away
Thanks in advance,
Elisabeth _________________ 1985 924 NA RoW
1981 931 S2 RoW |
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snakoil
Joined: 09 Feb 2010 Posts: 362 Location: Montreal, Canada
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Posted: Wed Aug 22, 2018 9:16 pm Post subject: |
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Another option would be to swap to a harness bar using the oem holes with a harness.
I had that setup in my car for a short while and the belt would come from behind at a straight angle if I remember well.
Be aware that I switched back to regular seatbelts since because I couldn't reach the radio and other buttons once strapped in _________________ 1979 924 NA |
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Eliza
Joined: 17 Aug 2015 Posts: 174 Location: Prov. Utrecht, The Netherlands
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Posted: Wed Aug 22, 2018 9:46 pm Post subject: |
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Thanks, though I find this a slightly "overkilly" solution.
Then again, considering I have 12 way power seats with lumbar and seat heaters (late 928 seats ) in the car, and after a full suspension overhaul last fall decided to upgrade the driver seat back to a sport seat back without losing any of the full-fledged comfort, overkill may be my middle name
No, I'd love to stick with the stock belt.
Let's see what other fascinating suggestions find their way here
Eliza _________________ 1985 924 NA RoW
1981 931 S2 RoW |
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924RACR
Joined: 29 Jul 2001 Posts: 8815 Location: Royal Oak, MI, USA
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Posted: Wed Aug 22, 2018 9:49 pm Post subject: |
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Ugh, I hate race harnesses in street cars...
Anyway, I feel like there are some simple straps probably available in the US that will hold the strap tighter/lower, for better comfort in normal driving, while still not impairing the normal function of the belt in a potential crash...
For sure, there are at least pads that can snap or velcro on to the strap to pad it and reduce chafing... _________________ Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Eliza
Joined: 17 Aug 2015 Posts: 174 Location: Prov. Utrecht, The Netherlands
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Posted: Thu Aug 23, 2018 2:21 pm Post subject: |
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I decided to raise the issue with my mech ( who also does the roadworthiness checks for my car ). We will fab a bracket out of 3 mm steel to lower the mounting point about 4 cm which will be completely removable if needed/wanted.
This bracket will be mounted into the original mounting point and have an inverted T-shape to ensure fitment around the B-pillar so it doesn't become dislocated in case of an impact.
Thanks for your suggestions, but I want to solve the issue rather than work around it. Hooray to my P-car whisperer who humours my every crazy idea
Eliza _________________ 1985 924 NA RoW
1981 931 S2 RoW |
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morghen
Joined: 21 Jan 2005 Posts: 8884 Location: Romania
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Posted: Thu Aug 23, 2018 5:59 pm Post subject: |
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Do you have seat raisers installed?
Maybe those will help and you don't have to do this mod.
That fabbed anchor and bolt...i'd like to see the design of it.
I'm not saying you should not move the anchor of the seatbelt but i'm saying that the system has been tested and calibrated with a certain geometry.
In case of a crash the results may be different.
Now this is probably not going to make a difference since your modification falls inside the positional tolerance of the testing rig but be advised that some authorities may amend you for doing mods on the safety system of your car. _________________ https://www.the924.com |
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Eliza
Joined: 17 Aug 2015 Posts: 174 Location: Prov. Utrecht, The Netherlands
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Posted: Thu Aug 23, 2018 7:24 pm Post subject: |
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Hi Morghen,
thanks for your concern . I want to avoid unpleasantness of course - both with authorities AND potential crash issues. That's why I asked the person who will MOT my car. He will NOT approve anything unless he deems it failsafe. PITA sometimes, but in the end, my own safety is at stake.
Seat raisers? Nah... I swapped, as stated, to 12 way power 928 seats that are height adjustable at a touch of a button. And they even work Ah, the little luxuries... _________________ 1985 924 NA RoW
1981 931 S2 RoW |
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morghen
Joined: 21 Jan 2005 Posts: 8884 Location: Romania
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Posted: Thu Aug 23, 2018 8:39 pm Post subject: |
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Not that I don't trust your MOT guy, but I worked as a design engineer for seatbelt systems for 7 years.
Can you show me a sketch or the finished product?
I hope no welding is involved..also any fasteners must be class 8.8 and mimimum size is 7/16" UNF20 thread with the bolts being free of Hidrogen molecules, that's a special kind of bolt.
The sheet metal used must be 3mm thick as a minimum and the steel inside must be according to the 550MC type specification.
All potentially loaded sections of the sheet metal must be at full material thickness and offer a minimum of 8mm width as projected to a plane. _________________ https://www.the924.com |
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Eliza
Joined: 17 Aug 2015 Posts: 174 Location: Prov. Utrecht, The Netherlands
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Posted: Thu Aug 23, 2018 9:26 pm Post subject: |
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Yep, we decided on 3mm thickness, as stated above.
I can send you a sketch once we've entered the planning phase ( probably next week's friday ).
Good to know you have insight, something to store for future reference!
How's the "other" P-car?
Eliza _________________ 1985 924 NA RoW
1981 931 S2 RoW |
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morghen
Joined: 21 Jan 2005 Posts: 8884 Location: Romania
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Posted: Thu Aug 23, 2018 10:08 pm Post subject: |
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They Cayman is a great driving machine.
I miss the 924s though, quite a bit. _________________ https://www.the924.com |
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Eliza
Joined: 17 Aug 2015 Posts: 174 Location: Prov. Utrecht, The Netherlands
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Posted: Thu Aug 23, 2018 10:51 pm Post subject: |
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I hear you. So sad. All the work, sweat tears, joy, money, memories.
But you know, at some point another one will find you. I'm almost certain _________________ 1985 924 NA RoW
1981 931 S2 RoW |
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Eliza
Joined: 17 Aug 2015 Posts: 174 Location: Prov. Utrecht, The Netherlands
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Posted: Sat Mar 23, 2019 5:22 pm Post subject: The solution |
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Hi all!
Long time in the making, but should anyone ever have the same issue, here's my solution.
As always, it was totally different from what I thought.
No intricate and potentially risky fiddle involved ( Morghen will be glad to hear ).
Thing is, I had installed 928 power seats at one point, which sit considerably higher than the manual seats. I did leave the 924 seat belt buckles in place, and mounted on the tunnel as opposed to the seat itself. Now... apparently, the buckles for the power seats/sports seats are 5 cm longer ( and NLA ).
So I bought an aftermarket, E4 approved, longer belt buckle which completely changes the geometry of the closed seat belt back to where it should be, and no more neck grazing! Happy bunny here!
Eliza _________________ 1985 924 NA RoW
1981 931 S2 RoW |
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morghen
Joined: 21 Jan 2005 Posts: 8884 Location: Romania
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Posted: Sat Mar 23, 2019 5:32 pm Post subject: |
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Great, isnt the steering wheel too close to your legs now?
By the wat, I bought another 924 and its currently being painted _________________ https://www.the924.com |
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Eliza
Joined: 17 Aug 2015 Posts: 174 Location: Prov. Utrecht, The Netherlands
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Posted: Sun Mar 24, 2019 3:34 pm Post subject: |
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Hi Morghen!
Good to hear! Post pictures!
Yep, had an issue with the steering wheel and getting into the car to begin with. One of the first things I did was get rid of the 3 spoke steer. I had a Momo for a while, but now I have a 4 spoke 944 steer. That one is mounted off-centre and works fine. No more undignified scrambling getting in and out
Eliza _________________ 1985 924 NA RoW
1981 931 S2 RoW |
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