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 Post subject: weight reduction?
PostPosted: Sat Nov 08, 2014 11:21 am 
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Joined: Tue Jul 17, 2012 4:56 am
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Location: Netherlands
I'm looking for some more ways to get the weight of my swift down.
Has anyone documented some basic or creative stuff to get the car lighter without really sacrificing drivability or safety?

Any basic modifications and weight specs would be nice.

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 Post subject: Re: weight reduction?
PostPosted: Sat Nov 08, 2014 1:44 pm 
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Hi,

A pile of info here: viewtopic.php?f=15&t=48441

Cheers,

Drew

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 Post subject: Re: weight reduction?
PostPosted: Sat Nov 08, 2014 3:52 pm 
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Joined: Sat Apr 30, 2005 9:27 pm
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Location: Brisbane
What motor sport are you doing & do you have to comply with class rules


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 Post subject: Re: weight reduction?
PostPosted: Sat Nov 08, 2014 7:03 pm 
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Location: Netherlands
I dont have any real class rules so could be creative.
My rolcage will be extended to the front of the car soon, so that will finally allow me to gut my doors etc.

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 Post subject: Re: weight reduction?
PostPosted: Sun Nov 09, 2014 11:39 am 
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Location: Brisbane
If you fabricate your roll cage to pick all the suspension load points up & have side intrusion bars fitted you can do some serious weight reduction with out compromising your safety

if you do not want to go to the expense of after market panels you could cut the inside of the doors out to match Zuboo fibre glass doors. Cut the inside out of the rear hatch. Replace all glass other than front screen with lexan. Cut all the bracing ribs out of bonnet. cut out the spare wheel well & rivet in aluminium panel. remove the dash & remove everything from back of bulkhead ( heater etc) Refit dash top section only. Just the sound proofing on floor weighs 8kg. Do a Datman & go to town with a hole saw inside car ( keep bulkhead fireproof)

Go for the lightest (safest) seat & lightest wheels you can afford.

Watch the weight of discs & calipers if you change you brakes


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 Post subject: Re: weight reduction?
PostPosted: Sun Nov 09, 2014 2:04 pm 
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If you're a big bloke then hit the gym and do some weight reduction on your body too! :lol:

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 Post subject: Re: weight reduction?
PostPosted: Sun Nov 09, 2014 7:21 pm 
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Joined: Tue Jul 17, 2012 4:56 am
Posts: 164
Location: Netherlands
Thanks guys. Zuboos topic is/was really helpful.
I'm skinny as fook, so nothing to win there.

But sofar ive done the following:
-Home made fibreglass bonnet (11 to under 4 kg)
-Stock bumpers instead of aftermarket
-ditched the turbo kit
-carbs, so have very little wiring left
-gutted interiour and dash and removed sound deadening.
-lightweight battery

Things to do:
-Gut the doors and make carbon fiber or fiberglass door skin. (Current doors are really heavy because sound system-sound deadening)
-lexan windows(actually in the uk now to pick those up)
-13 inch wheels with full slicks.
-Lighten the rear hatch
-weigh the car

I really like the way dattmans car is built, but i'm a bad fabricator.. so that probably wont happen.

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Last edited by Salto on Sun Nov 09, 2014 7:53 pm, edited 2 times in total.

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 Post subject: Re: weight reduction?
PostPosted: Sun Nov 09, 2014 7:23 pm 
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Location: Netherlands
Has anyone ever tried a carbonfiber/fibreglass roof skin?

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 Post subject: Re: weight reduction?
PostPosted: Sun Nov 09, 2014 7:34 pm 
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Location: Western Australia
Hi Mate,

If you really want to get serious, PM member 'Bewitched Gti'. He assembles complete kits of titanium nuts, bolts and washers specifically for GTi cars.

I've got a pile of them! They weigh next to nothing and are much stronger than steel. It all adds up in the end.

And don't be scared of grabbing a bag of dry ice and applying it to the sound deadening. It smashes out easily when cold and you lose around 13kg! Cheapest 'upgrade' ever!

Cheers,

Drew

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 Post subject: Re: weight reduction?
PostPosted: Sun Nov 09, 2014 7:56 pm 
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Forgot to mention that i did the sound deadening already

Image

how much do the titanium bolts save you?

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 Post subject: Re: weight reduction?
PostPosted: Sun Nov 09, 2014 9:07 pm 
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Salto wrote:
how much do the titanium bolts save you?

Not enough for the money, anyhow pop rivets are lighter and cheaper, all the m6 bolts that hold the front guards on can be ditched and be riveted in place, poly carb windows are good but the real weight savings comes in ditching all the metal reinforced door and window mouldings.

Captive nuts and brackets is my personal favourite, those rear seatbelt threads are quite heavy, nothing some aluminiun foil can't cover up :lol: also any weight up high should be a prime target.

At the moment it's looking like I'm losing the arms race with Zuboo, I haven't got any fibre glass yet, the guy I have got making me a mould for the rear hatch is working at glacial speed :( and the other fibreglasser I had lined up for the doors want's to fob me off to somebody else...why are good fibreglassers so hard to find???


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 Post subject: Re: weight reduction?
PostPosted: Sun Nov 09, 2014 10:14 pm 
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Location: Netherlands
Why not try fibreglassing yourself. Molding isnt hard at all, and the internet is full of how to's
We created our own bonnet, and im thinking about moulding the roof skin and riveting a carbon fibre panel in

Same with doors, doors are a bi**h to make, so i'm only cutting out the outer skin and replacing that. Maybe perforating the rest

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 Post subject: Re: weight reduction?
PostPosted: Sun Nov 09, 2014 11:33 pm 
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you guys are spoilt....

Rally Cars have minimum weights, from factory she's already under weight and I should be adding ballast....

:(

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 Post subject: Re: weight reduction?
PostPosted: Mon Nov 10, 2014 12:54 am 
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Saves you a lot of work :mrgreen:

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 Post subject: Re: weight reduction?
PostPosted: Mon Nov 10, 2014 1:06 am 
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Dattman wrote:

At the moment it's looking like I'm losing the arms race with Zuboo, I haven't got any fibre glass yet, the guy I have got making me a mould for the rear hatch is working at glacial speed :( and the other fibreglasser I had lined up for the doors want's to fob me off to somebody else...why are good fibreglassers so hard to find???


Your still lighter.

With the turbo kit, 1600 gear box, 30mm drive shafts im not even in the ball park. Hopefully im in the 670kg range with the last set of mods but more importantly i have been working to better the weight split front to rear.

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 Post subject: Re: weight reduction?
PostPosted: Mon Nov 10, 2014 9:16 am 
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Do you have to have the passenger front seat? You could save there.

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 Post subject: Re: weight reduction?
PostPosted: Mon Nov 10, 2014 10:12 am 
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I need to get my racing licence next year, so need a second seat for instruction, it will get removed after.

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 Post subject: Re: weight reduction?
PostPosted: Mon Nov 10, 2014 3:24 pm 
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Another trick is to remove hand brake assembly and associated cables and actuators from the rear brakes. Couple of kilos there and less weight going up and down on the rubber. If you need a hand brake install an inline hydraulic unit as the drift boys do and you can lose the rest.

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If "X" is an Unknown quantity, and a Spurt is a drip under pressure, then an "EXPERT" is an "Unknown Drip Under Pressure".
Why dont they just call it "Womenapause" instead.


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 Post subject: Re: weight reduction?
PostPosted: Mon Nov 10, 2014 4:30 pm 
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pictureshowman wrote:
Another trick is to remove hand brake assembly and associated cables and actuators from the rear brakes. Couple of kilos there and less weight going up and down on the rubber. If you need a hand brake install an inline hydraulic unit as the drift boys do and you can lose the rest.


Just be careful with the hydro hand brake, they aren't designed to be left on, they will bleed off and leave your car running away if park on an incline.

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 Post subject: Re: weight reduction?
PostPosted: Mon Nov 10, 2014 5:58 pm 
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Zuboo wrote:
Your still lighter.

With the turbo kit, 1600 gear box, 30mm drive shafts im not even in the ball park. Hopefully im in the 670kg range with the last set of mods but more importantly i have been working to better the weight split front to rear.


So I should be, there surely must be some sort of weight penalty for having 3 x the hp... :evil:

As for doing glassing myself, yes have done a few smaller projects myself but have neither the time or the space to do big projects, I'm preppping the car for repainting at the moment and because the garage is attached to the house the resin fumes are very much unappreciated by everyone else.

Having had an inline hydraulic handbrake I'm not a huge fan, everytime you stand on the brake the handbrake would rise a fraction adding a little 'mush' to the pedal feel, have ditched the handbrake and will just use an inline electric 'line lok', you are supposed to only run the line lok for 40 secs continuously, plenty of time for me to get out of the car and chock the rear wheel at a hillclimb :lol:


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