924Board.org

Which car to buy? · Joined: 24 Mar 2003 Posts: 163

Removing the steel bodies and putting on fiberglass in it's place. Hood, fenders and doors too. How much can you really save? 100 lbs? 200? How much weight can you drop if you do the interior too? Have a couple of sport seats, carpet stays, sound insulation goes out along with the radio, speakers and tape console. I would want it to look like a normal car{ ie keep the carpet} Anyone have weights of these parts? If I toss the rear seat, what can go in it's place? I don't want it to look weird.

Vince Ponz · Joined: 02 Nov 2002 Posts: 3581 Location: Florida

stock seat to race 30 to 10-20
rugs and insulation 40
interior parts 7
rear seat and back 20
rear mat and insulation 10
front and rear bumpers to Euro mounts 3.5 -8oz
US rubbers ea 3 lbs to Euro rubber about 4 oz ea for large 2 small
bumpers 25 to 11-12
Go on a diet lose 50 lbs
_________________
"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

Kenodog · Joined: 25 Jun 2003 Posts: 2651 Location: Vancouver,B.C.

Getting a fibreglass hood saves around 25
cutting down bumper shocks or making new brackets out of aluminum saves 20
rear hatch glass to Lexan 40-50
remove AC and all peripherals 75-80
Aluminum rad from an early 944,racing seats,plastic gas tank from a 944 etc. The list of possibilities is endless.For $3000 and some shopping around I think you could get it down to a respectable 2100-2200 lbs.
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

Dez · Joined: 25 Jul 2003 Posts: 189 Location: Wokingham, UK

Vince,

Do you have anymore pics of that fine car of yours?
_________________
1982 Porsche nine two four with Carrera GT conversion - people think i'm slow cos it's an X plate!!
http://www.p-caronline.com/directory/dez

CBass · Joined: 03 Nov 2002 Posts: 2807 Location: Vancouver, Canada

There is weight to be saved elsewhere too, converting the headlights to fixed buckets, converting to a coilover in the rear, with a Kokeln style rear crossmember.

Vince, how do you figure the rear mat is 10 lbs? Maybe your car had a lighter one than mine, but it weighed at least 30-40lbs.

GT Racing claims that you can drop about 50 lbs by converting to fiberglass bumpers. Their fenders weigh 4 lbs each unpainted, so that has to be quite lighter than stock, anyone know offhand how much a 924 fender or 1/4 panel weighs? They also claim a stock hood is 80 lbs, but I don't think it is. Before I replaced my hood hinges, I had to lift that hood on and off several times a week, and it's no 80 lbs.

http://www.gt-racing.com/catalog/gtr944.htm

People have weighed their sound deadening after removing, it's between 70-80lbs, IIRC. The bottom half of the rear seats don't really weigh anything, all the weight is in the top half. I put in new seats from a Mazda RX7, and they weigh about 20 lbs each, vs 35 or so for the highbacks, so that drops 30 lbs right there.

My goal is to get down to around 2100 lbs with a full interior, full glass and metal fenders. This involves swapping in an engine that is 80lbs lighter, making new suspension arms from tubular aluminum, and everything mentioned above.
_________________
'81 931 in various states of assembly

Neil924 · Joined: 18 Mar 2003 Posts: 4225 Location: Canada

It says you save about 27 lbs per fender.

1982Porsche924 · Joined: 14 Nov 2002 Posts: 679 Location: Cupertino, CA

the fiberglass fenders weigh almost nothing. A 4 year old could have lifted them. The stock fenders are about 25 lbs each. Substantial difference, and you get to have bigger wheels/tires.
_________________
1979 Porsche 924 "S"
Engine: Euro pistons, Light Flywheel, Weber TB, Bursch Header, Cam Wheel
Suspension: Front coil-overs, adj sways, Solid bush. Thicker tors. bars, 5-bolt, BBS rims
Body: Fiberglass widebody kit, 931 Nose

OR_Sunset · Joined: 04 Jan 2003 Posts: 312 Location: Veneta, OR

Okay, so if we can get a definitive figure like "a body kit (fenders, bumpers, 1/4 panels, rocker panels, headlight buckets) saves X lbs. weight"

can we then get $XXXX gets you 0.XX sec. faster 0-60 or ET times?

What is the dollars to decimals relationship here?

Neil924 · Joined: 18 Mar 2003 Posts: 4225 Location: Canada

Lizard · Posted: Thu Nov 27, 2003 3:02 am Post subject:

why dont you weight it, then convert and weight and find out.
_________________
3 928s,

ryoji · Joined: 10 Oct 2003 Posts: 168 Location: NNJ

Last time when I estimated for non-metal body parts; $8.5 per lb save, with least expensive sellers. With shipping and some instration parts etc, I think it could go up to $10 per lb. I think you get close to 8hp per 100+lb, isn't it?
_________________
R.I.P.:a 924 ITA race car