The Porsche 924 Owners Club

Dedicated to the Porsche 924
Forty Years of the Porsche 924 Turbo
It is currently Wed Nov 13, 2019 5:05 am

All times are UTC [ DST ]




Post new topic Reply to topic  [ 25 posts ]  Go to page Previous  1, 2, 3
Author Message
 Post subject: Re: Lightweight seats
PostPosted: Mon Feb 11, 2019 9:41 am 
Offline
Club Member
User avatar

Joined: Fri Jun 03, 2011 10:23 pm
Posts: 5005
Location: Penzance, Cornwall
Model: 924
Nige wrote:
mike.gamble wrote:
I was considering having the mounts manufactured locally, purpose made for the car seat, out of 5mm aluminium - which I believe is the requirement?

Yup, 5mm is the MSA minimum spec

mike.gamble wrote:
I don’t want to have a harness bar so will stick to the original belts.

Wise choice in my opinion (for the reason I gave earlier)


I’d actually like a harness and bar set up but, it would prove counterproductive with regards to weight loss.
I take it a harness bar would have to be steel?

_________________
1986 924S. Needing love but, back on the road and loving it!
1986 928 S2 Long term project. Been in storage, needs full recommissioning.
1981 2.0 N/A. Still not running and I’ve had it for months!
1979 Mercedes 450SLC
1981 VW T25 camper. ‘The nail’ very slow diesel burner.
1991 Toyota Celica. At £182, too cheap to refuse....


Top
 Profile  
Reply with quote  
 Post subject: Re: Lightweight seats
PostPosted: Mon Feb 11, 2019 9:50 am 
Offline
Club Member
User avatar

Joined: Mon May 18, 2015 7:53 pm
Posts: 1669
Location: Bournville - Land of Chocolate
Model: 924S
mike.gamble wrote:
Nige wrote:
mike.gamble wrote:
I was considering having the mounts manufactured locally, purpose made for the car seat, out of 5mm aluminium - which I believe is the requirement?

Yup, 5mm is the MSA minimum spec

mike.gamble wrote:
I don’t want to have a harness bar so will stick to the original belts.

Wise choice in my opinion (for the reason I gave earlier)


I’d actually like a harness and bar set up but, it would prove counterproductive with regards to weight loss.
I take it a harness bar would have to be steel?

I see no reason why a bar shouldn't be alloy as long as it's strong enough. The MSA Blue Book isn't clear about such things.
My harnesses are anchored to the shell, so no harness bar weight involved. I'd still be unhappy with harnesses in a shell with no roll protection though

_________________
Nige
1985 924S Historic Road Rally / Targa Rally Car


Top
 Profile  
Reply with quote  
 Post subject: Re: Lightweight seats
PostPosted: Mon Feb 11, 2019 10:38 am 
Offline
Club Member
User avatar

Joined: Sat Jan 30, 2010 11:13 pm
Posts: 15507
Location: Somerset
Model: TheOnly Way Is Turbo
Hi Mike. Please remind me is this purely a road car, a 'fun' track day car or potential 'event' car where it may be scrutinised, albeit as a road going sports/saloon class than pure race car? Knowing the final outcome of the car may end up with differing scenarios that decide what's needed/not needed. As we have bounced between threads for the NA and S its a little confusing for me what we are trying to help you with, well it is for me. One project thread per car is often helpful as if we forget the objective its easy to go back and review the project in previous posts.

Weight loss should be seen as a collective, not in isolation. You may take weight out in one hand and then be forced add back in the other.

_________________
Steve
1980 924 Turbo Series 1 - Alpine White & Guards Red
Omega forged pistons, lightened and balanced bottom end, ARP studs + Cometic MLS HG, Piper fast road cam, K27/26 3257 hybrid turbo, 951 ducted FMIC, Custom intake manifold, Mittelmotor dizzy & cam pulley, Adj boost - dyno’d at 225bhp @ 1.0bar on previous CGT turbo, Engine datalogged and on boost fuel enrichment managed with Zeitronix ZT2 & Phormula KS4 knock sensor, 944 turbo all alloy radiator, Hayward & Scott custom tapered race exhaust, GAZ Gold coilovers, Fuch'ed up, Quaife LSD
2017 VW Passat Variant GTE Advance - the daily load lugger and mile muncher
2015 Nissan Leaf Tekna - it builds trees when we drive it


Top
 Profile  
Reply with quote  
 Post subject: Re: Lightweight seats
PostPosted: Mon Feb 11, 2019 10:52 am 
Offline
Club Member
User avatar

Joined: Sat Jan 30, 2010 11:13 pm
Posts: 15507
Location: Somerset
Model: TheOnly Way Is Turbo
mike.gamble wrote:
I was considering having the mounts manufactured locally, purpose made for the car seat, out of 5mm aluminium - which I believe is the requirement?

I don’t want to have a harness bar so will stick to the original belts.


Make sure you take a look at other mounting options in the market. Make sure they are multi drilled so you can tailor the seat location and angles in the car. I bought mounts with limited holes. Spent a day drilling multi holes. Seats were in and out all day trying to get the position right. I had an issue with being too high, too forward and head too close to the roof/A pillar/cage. Once the seat was dropped and tilted to the right position bolting it in/out was a complete PITA!

Original 3 point belts are best for daily use, far less restrictive and safer for road. Harnesses are best for spirited driving, track/hillclimb events as you are pinned into the car, far more restrictive and safer if you hit something hard, but as Nige says, you could incur worse injuries if the shell collapses around you than if you had stock seat/3 point belts. A friend of mine survived a full roof collapse because his upper body was pushed towards the passenger seat and legs remained in the drivers footwell. Had he bin pinned into a hard back seat and harness he would have been decapitated.

Its argued that even having a full cage with stock seats with 3 points is more dangerous than without as the opportunity to hit the hard cage with head and body is far more likely.

_________________
Steve
1980 924 Turbo Series 1 - Alpine White & Guards Red
Omega forged pistons, lightened and balanced bottom end, ARP studs + Cometic MLS HG, Piper fast road cam, K27/26 3257 hybrid turbo, 951 ducted FMIC, Custom intake manifold, Mittelmotor dizzy & cam pulley, Adj boost - dyno’d at 225bhp @ 1.0bar on previous CGT turbo, Engine datalogged and on boost fuel enrichment managed with Zeitronix ZT2 & Phormula KS4 knock sensor, 944 turbo all alloy radiator, Hayward & Scott custom tapered race exhaust, GAZ Gold coilovers, Fuch'ed up, Quaife LSD
2017 VW Passat Variant GTE Advance - the daily load lugger and mile muncher
2015 Nissan Leaf Tekna - it builds trees when we drive it


Top
 Profile  
Reply with quote  
 Post subject: Re: Lightweight seats
PostPosted: Mon Feb 11, 2019 5:24 pm 
Offline
Club Member
User avatar

Joined: Sun Feb 08, 2015 7:56 pm
Posts: 2686
Model: 924S
Steve has said it all perfectly, if you want a more supportive seat that's fine but run it with the inertia reel belts only, it'll tuck you in on corners for more sportier driving and even foe basic low level sprinting will be fine.

_________________
Current progress on the S https://porsche924.co.uk/forum/viewtopic.php?t=21946

1987 924S
1981 924 2.0 n/a
2016 BMW 640D Msport
2007 Porsche Cayenne


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 25 posts ]  Go to page Previous  1, 2, 3

All times are UTC [ DST ]


Who is online

Users browsing this forum: Google [Bot], Majestic-12 [Bot] and 35 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
© 2009-2019 The Porsche 924 Owners Club - Powered by phpBB