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NedHan79
Hockenheim


Joined: 08 Nov 2018
Posts: 677



PostPosted: Sun Nov 17, 2019 2:47 pm    Post subject: Acceptable weight loss Reply with quote

I’ve been going through the ela thread on here. I’ve not finished it yet but I’m getting there. My cars an ongoing project and restoration of sorts. A lot of mods done but a lot more to do.

What I want to know is, has anyone here done the basic weight saving things and actually noticed the difference?

At the minute my mods are full ss headers, 200 cell cats and silencers, air box mod, iridium plugs and sure fire coil packs. Home modified engine mounts. I’m removing the full air con system as it’s past it and I never use it to fix it.
Spax lowering springs on m030 shocks, black Series powerfex arb bushes front and rear, Rear arb modified and adjustable. new spyder performance coffin arms with modded bushes. New Sachs top mounts on front shocks with
Modded bushes.
Probably loads more done but can’t think now.

What I’m thinking of doing to save weight is removing-
Spare wheel and tool kit
Radio and all speakers(can’t hear it anyways)
One of the radiator fans like a gt3 rs (I will be fitting the ltt)
Seats at some stage when the budget allows
Wiper delete already done
Light weight flywheel


I’m open to suggestions but I still need it child friendly. I’m ok with removing some sound deadening but I won’t be changing carpet.

Also worth noting, I have a sunroof and always use this so it’s definitely a keeper. My car is a 1998 aero c2 manual.

All ideas welcome but the budget is the big thing here

Thanks
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Phil 997
Le Mans
Le Mans


Joined: 05 Dec 2015
Posts: 15570
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Sun Nov 17, 2019 4:01 pm    Post subject: Reply with quote

If the car isn't a daily and you can keep it on a trickle charge , theres a big saving removing the OE battery and fitting a small light race battery , ELA(Richard saved a lot something like 20lbs when he did it ) but I talked about it with him when we met in Germany and he did say it wouldn't be good for me as mines a daily . Thumb
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GMG
Nürburgring


Joined: 07 Jan 2018
Posts: 464
Location: Devon


PostPosted: Sun Nov 17, 2019 4:13 pm    Post subject: Reply with quote

...weight saving...why?

Unless you reduce the weight significantly what exactly is the point ? I doubt that you will even notice it ?

Cost v Value Dont know
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17144
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sun Nov 17, 2019 4:18 pm    Post subject: Reply with quote

I notice my car's slower with the hard top on.......and that doesn't weigh much.
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NedHan79
Hockenheim


Joined: 08 Nov 2018
Posts: 677



PostPosted: Sun Nov 17, 2019 4:46 pm    Post subject: Reply with quote

Phil997
I meant to add the battery to the list. Mine seemed to be a bigger one than standard so a good saving there. It’s not a daily and I have a c-tek so that’s covered.

GMG
This is why I’m asking. I know every little helps and all that but is it worth the while. It’s not going to cost much as most of it’s just my own labour.

Alex
What is the weight difference?
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Dammit
Indianapolis


Joined: 23 Sep 2016
Posts: 2391



PostPosted: Sun Nov 17, 2019 4:59 pm    Post subject: Reply with quote

33kg for the hard top, it's not nothing. I reckon a drop in the road, engine and exhaust noise will also make the car feel slower.
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17144
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sun Nov 17, 2019 5:22 pm    Post subject: Reply with quote

I know Peter S has said exactly the same about his Gen 2 cab with the HT on.
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NedHan79
Hockenheim


Joined: 08 Nov 2018
Posts: 677



PostPosted: Sun Nov 17, 2019 5:34 pm    Post subject: Reply with quote

I’d be aiming for around 50kg reduction. Is it worth the hassle?

Anyone removed sound deadening and kept original carpet?
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17144
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sun Nov 17, 2019 5:36 pm    Post subject: Reply with quote

NedHan79 wrote:
I’d be aiming for around 50kg reduction. Is it worth the hassle?



work out the BHP/tonne, should be easy enough. From that you should be able to roughly work out the 0-60 gain.
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7333
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Sun Nov 17, 2019 5:58 pm    Post subject: Reply with quote

I reduced my own weight by over 20kg by taking up cycling. Very Happy

Other than that, every time I take wheels off or change brake discs I’m struck by how heavy they are... surely something to lose there?

Fuel weighs a kilo per litre. So put less fuel in.
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NedHan79
Hockenheim


Joined: 08 Nov 2018
Posts: 677



PostPosted: Sun Nov 17, 2019 6:10 pm    Post subject: Reply with quote

I could def do with 20 kilos off Surprised
By the time this is back on the road I’d more likely be up 20.lol

Rough calculations on the car being 1380kg to start with are 215hp/tonne. That’s with my dyno figures of 298hp. Take 50-60kgs off and your up to about 225hp/tonne. Dosnt sound like much but it’s more for fun than out right speed.

I’ve also to consider that I should be down a few kgs with the after market cats and exhaust
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17144
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sun Nov 17, 2019 6:17 pm    Post subject: Reply with quote

Petrol's 0.7kg per litre (sorry for being pedantic Embarassed )
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Winny911
Montreal


Joined: 13 Dec 2012
Posts: 585



PostPosted: Sun Nov 17, 2019 6:24 pm    Post subject: Reply with quote

If you want to lose weight you should consider things like:-

Carbon roof doors bonnet boot bumpers
Plastic windows all round
Remove interior trim and sound deadening
Take the leather off the dashboard
Drill out any steel panels

There is loads that can be done to save weight
 
  
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7333
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Sun Nov 17, 2019 6:27 pm    Post subject: Reply with quote

Alex wrote:
Petrol's 0.7kg per litre (sorry for being pedantic Embarassed )


Not at all... interesting, not realised it was lighter than water... guess it makes sense as petrol floats on the waters surface.
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sp1ke
Trainee


Joined: 07 May 2009
Posts: 81



PostPosted: Sun Nov 17, 2019 7:04 pm    Post subject: Reply with quote

if you're aiming for a 50Kg weight reduction & want to gauge the potential improvement, then try it the other way around.
Take a 50Kg passenger for a spin & see if you can feel the difference with & without the passenger.
I know it's not the same as losing 50Kg, but it'll give you a rough feel for the difference you could expect.
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Cunno
Indianapolis


Joined: 13 Dec 2008
Posts: 2366
Location: Nottinghamshire


PostPosted: Sun Nov 17, 2019 7:07 pm    Post subject: Reply with quote

One tip if you haven’t done so already is weigh the car first. 1380 kg sounds low for a running car.
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NedHan79
Hockenheim


Joined: 08 Nov 2018
Posts: 677



PostPosted: Sun Nov 17, 2019 7:10 pm    Post subject: Reply with quote

Winny911 the key word here is budget. I’ll look at sound deadening simply because I’ll have to strip the carpets back to weld new studs on the under side of the floor.

On that note, I might look at aluminium covers for under the floor as my own are cracked and broken and I could make them a lot cheaper than replace them Question
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Dammit
Indianapolis


Joined: 23 Sep 2016
Posts: 2391



PostPosted: Sun Nov 17, 2019 7:16 pm    Post subject: Reply with quote

I didn't weigh my drivers seat, but it's significant - at least as much as the hardtop I'd say. The Recaro I fitted to replace it is ~6kg, plus a bit for the base.

I'd say you'd save an easy 50kg by swapping the seats, potentially the same again stripping the cabin out - but for a road car that'd make it a miserable place to spend time.

Take the easy wins - which to me would be seats, spare wheel (sealant and a pump instead), maybe battery if you can keep it on a tender.

Now if it's an out and out track car, bin the whole interior, doors, wings, bonnet, boot lid, air con, hydraulic power steering, etc etc and replace the body panels with fibre glass.

But it'd then be fit only for driving half an hour to the track.

I think for a road car take the easy wins on weight then attend to the power - its power-to-weight after all, so look at both sides of the coin.
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NedHan79
Hockenheim


Joined: 08 Nov 2018
Posts: 677



PostPosted: Sun Nov 17, 2019 7:33 pm    Post subject: Reply with quote

Had a very quick look at the numbers which I blatantly stole from Ela’s thread. I’m easily looking at 85-102kgs depending on battery choice and a few other bits that I already have on(cats etc). This is without touching sound deadening so maybe a little more but I don’t want to ruin it. It’s more than loud enough.

This is a weekend toy at the end of the day, hopefully a track day or 2 but won’t be many due to time constraints
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17144
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sun Nov 17, 2019 7:37 pm    Post subject: Reply with quote

I saw someone recently in the FB 996 group do a electric power steering pump in the frunk mod. That'll save a few kilos once you get rid of the original pump and all that pipework.
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