quote:
Originally posted by DANMAN
I have seen these cars around the 420kg mark, I'm curious as to how they get that low?
All the 7's down that low are, afaik, all BEC's.
The only real way to get down there is to design it for minimum weight in the first place (many mentioned above) and think in the following way about
EVERY component:
- do I need it?
- can I make it smaller/lighter if I do?
1.2mm ally floor
18swg round tubes in the chassis where 16swg aren't required (and a lot of chassis are made from 2mm because it's easier to get and to
weld)
racing battery
small ally fuel tank
13" magnesium split rim wheels and lightweight tyres
minimum comforts/instruments
foam and bin-bag seat (only driver seat/harness fitted)
no lights (if it's a track only car) LED as far as possible if not.
minimal loom
no (or minimal) bit's of sierra (a car designed to be 2+tonnes fully loaded and all components over engineered to be on the safe side)
alloy 1.9inch spring shocks
alloy hubs (and uprights if you're feeling brave)
2pot alloy brakes (unvented, mimimum sized discs)
all bolts cut down to exactly 1.5 threads exposed after the nut
non-critical bolts drilled out
smallest bolt diameter you can get away with in all applications without a required size
Lightweight panels (either thin 'racing' grp or something more exotic)
But to be honest there is a LOT of weights quoted are underestimates, often because the owners don't know and "guess", or use the
SVA/IVA front and rear weights and add them together (this gets a lower than actual figure due to the way they are measured one axle at a time). Much
like bhp in that regard.
On the often quoted 'have a dump', you can still go that route with a light car and get double benefit 
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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