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 Post subject: Re: Lightweight seats
PostPosted: Sun Feb 10, 2019 3:08 pm 
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Location: Penzance, Cornwall
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https://www.ebay.co.uk/itm/2019-FIA-Spa ... ctupt=true

This is the seat I saw.

It's only 6.5kg but, I'll have to add the weight of the mounts and, I haven't really thought about seatbelts/harnesses.
Obviously these seats usually have harnesses but, would a harness set up (I'm guessing the rear seat lap-belt fixings could be used) be heavier that the standard seatbelt?

I'll try and weigh a normal seat and see how heavy they are!

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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
1955 Land Rover Series 1 107 pick up
1981 VW T25 camper. ‘The nail’ very slow diesel burner.
1991 Toyota Celica. At £182, too cheap to refuse....


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 Post subject: Re: Lightweight seats
PostPosted: Sun Feb 10, 2019 5:51 pm 
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Location: Bournville - Land of Chocolate
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mike.gamble wrote:
https://www.ebay.co.uk/itm/2019-FIA-Sparco-GRID-Q-Racing-Seat-LIGHTWEIGHT-QRT-Rally-Race-Fiberglass-NEW/283361523367?hash=item41f9a9b6a7:g:kEcAAOSwFlJcVGuz:rk:1:pf:1&frcectupt=true

This is the seat I saw.

It's only 6.5kg but, I'll have to add the weight of the mounts and, I haven't really thought about seatbelts/harnesses.
Obviously these seats usually have harnesses but, would a harness set up (I'm guessing the rear seat lap-belt fixings could be used) be heavier that the standard seatbelt?

I'll try and weigh a normal seat and see how heavy they are!

That's a nice seat. I'm selling two standard seats at the moment so I know that with runners they weigh approx 15kg each

No passenger seat fitted is still just an advisory as far as I know - plenty of competition cars are road legal with only the driver's seat

Harnesses aren't particularly light but they don't have the inertia reel mechanism so are probably lighter. Two inch belts with regular seat belt type buckles are the easiest option but you can pay for FIA belts with alloy adjusters etc

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1985 924S Historic Road Rally / Targa Rally Car


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 Post subject: Re: Lightweight seats
PostPosted: Sun Feb 10, 2019 7:06 pm 
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Location: Somerset
Model: TheOnly Way Is Turbo
DO NOT fit harnesses to the rear seat lap belt mounts. You'll potentially break your seat and back in a heavy hit. Mountings for the harness should be near shoulder or up to a few inches below. So a harness bar will be needed

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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, Carrera GT turbo soon to be GTR spec!!, 951 ducted FMIC, Custom intake manifold, Mittelmotor dizzy & cam pulley, Adj boost - dyno’d at 225bhp @ 1.0bar, now run up to 1.3bar!, 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


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 Post subject: Re: Lightweight seats
PostPosted: Sun Feb 10, 2019 7:44 pm 
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Location: Birkenhead (UK)
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Nige wrote:
No passenger seat fitted is still just an advisory as far as I know - plenty of competition cars are road legal with only the driver's seat


You have to let your insurance know, some have had their insurance voided on missing seats.

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1983 Silver(ish)/rust n/a manual - Project Candy, SCRAPPED
1982 Guards Red n/a manual - Project 66, SOLD.
1982 Garnet Red n/a manual - Project XLE (532 licensed, 1430 sorn'd)
1983 White n/a manual - Mr White Returns
2002 Berlingo Multispace 1.9D, 189,000 miles, daily driver


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 Post subject: Re: Lightweight seats
PostPosted: Sun Feb 10, 2019 7:53 pm 
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dd924 wrote:
Nige wrote:
No passenger seat fitted is still just an advisory as far as I know - plenty of competition cars are road legal with only the driver's seat


You have to let your insurance know, some have had their insurance voided on missing seats.


As with ANY modification from OEM

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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, Carrera GT turbo soon to be GTR spec!!, 951 ducted FMIC, Custom intake manifold, Mittelmotor dizzy & cam pulley, Adj boost - dyno’d at 225bhp @ 1.0bar, now run up to 1.3bar!, 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


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 Post subject: Re: Lightweight seats
PostPosted: Sun Feb 10, 2019 8:44 pm 
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Location: Bournville - Land of Chocolate
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Carrera RSR wrote:
DO NOT fit harnesses to the rear seat lap belt mounts. You'll potentially break your seat and back in a heavy hit. Mountings for the harness should be near shoulder or up to a few inches below. So a harness bar will be needed

Absolutely +1

Also, I would suggest you stick with standard three point belts if you have no roll protection, which I assume will be the case if you're just looking to reduce weight? Three point belts are designed to allow the occupant to roll forwards and towards the centre of the car in the event of the roof structure collapsing in a roll over accident. Full harnesses will keep you upright and susceptible to serious upper body injuries

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1985 924S Historic Road Rally / Targa Rally Car


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 Post subject: Re: Lightweight seats
PostPosted: Sun Feb 10, 2019 9:53 pm 
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Joined: Sat Jan 30, 2010 11:13 pm
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Location: Somerset
Model: TheOnly Way Is Turbo
mike.gamble wrote:
https://www.ebay.co.uk/itm/2019-FIA-Sparco-GRID-Q-Racing-Seat-LIGHTWEIGHT-QRT-Rally-Race-Fiberglass-NEW/283361523367?hash=item41f9a9b6a7:g:kEcAAOSwFlJcVGuz:rk:1:pf:1&frcectupt=true

This is the seat I saw.

It's only 6.5kg but, I'll have to add the weight of the mounts and, I haven't really thought about seatbelts/harnesses.
Obviously these seats usually have harnesses but, would a harness set up (I'm guessing the rear seat lap-belt fixings could be used) be heavier that the standard seatbelt?

I'll try and weigh a normal seat and see how heavy they are!


Steel side mounts weigh more than the seats...... so add another £100+ per seat for alloy.....but whilst lighter than steel, they are still not light per se. All in, you won't save a huge amount of weight unless going carbon or a Kirky ally shell seat.

My Cobra Suzuka Pro, steel side mounts were similar weight to stock seats. Never weighed them, but carried them in and out of the car a few times. There wasn't a lot between them. The weight saved in stripping out stock front and rear seats, taking out sound deadening etc was more than replaced by race seats, harnesses and full roll cage. But ultimately the car was a safer place to be once all buttoned up. Also nothing helps you on track more than being low down and fixed tightly with seat and harness.

_________________
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, Carrera GT turbo soon to be GTR spec!!, 951 ducted FMIC, Custom intake manifold, Mittelmotor dizzy & cam pulley, Adj boost - dyno’d at 225bhp @ 1.0bar, now run up to 1.3bar!, 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


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 Post subject: Re: Lightweight seats
PostPosted: Sun Feb 10, 2019 10:34 pm 
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Location: Bournville - Land of Chocolate
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Carrera RSR wrote:
Steel side mounts weigh more than the seats......

I guess Steve is exaggerating the point a tad. My side mounts are the regular 3mm steel type (came free with the seats) and I'd say they add only about 2kg per seat. Alloy will obviously be thicker, but still lighter

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1985 924S Historic Road Rally / Targa Rally Car


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 Post subject: Re: Lightweight seats
PostPosted: Sun Feb 10, 2019 11:10 pm 
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Joined: Fri Jun 03, 2011 10:23 pm
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Location: Penzance, Cornwall
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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.

_________________
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
1955 Land Rover Series 1 107 pick up
1981 VW T25 camper. ‘The nail’ very slow diesel burner.
1991 Toyota Celica. At £182, too cheap to refuse....


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 Post subject: Re: Lightweight seats
PostPosted: Sun Feb 10, 2019 11:20 pm 
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Location: Bournville - Land of Chocolate
Model: 924S
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)

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1985 924S Historic Road Rally / Targa Rally Car


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