remove the following, some already covered:
central air vent tunnel
remove the dash & then remove the sound proofing on the bulk head, thats worth at least 10kg
remove the heater matrix, another 12kg, fit an electric heater to de-mist the windscreen [ may no be an issue in Aus ]
As part of the rules can you cut the passengers side off the dash?
Striping back the wiring loom would reduce weight too
remove the standard fuel tank & fit a light weight version
racing suspension could be lighter than road parts
remove any trim from around the engine bay, bonnet carpet, bulk head lining, dump the washer system.
air-con pump is a hard one to work around on a V6 as its one of the systems driven by the AUX belt which in turn operates the water pump. simply removing the pump & fitting a shorter belt is not solution. HOWEVER you could remove the air-con rad & piping & wiring , that should also save a few kgs.
I wonder if you could ditch the power steering pump too & fit an electric module could that be combined into the one project with removing the air-con pump?????
Thanks so much for these 'hidden' weight savings.
In answer to a couple of your questions.
1. We can't cut the dash (but I don't think they removed the sound proofing you mention behind the dash).
2. We do need the demister paricularly if we run the 12hr at Mt Panorama (at the same time as the GT Audi R8s. Bigger rear view mirror required!). I will check the regs as to whether a heated windscreen is allowed.
3. If we can find a solution to the AC pump then that would be good but we must keep the power steering pump.
One thing we are allowed to do to the engine is to fit lightweight pulleys to drive the ancillaries etc. This would certainly reduce some rotating mass and not only save some weight but perhaps free up some ponies. I say this without knowing how lightweight the factory pullies are.
It is starting to look very promising now. The important thing is that even if I get the weight below the minimum then I can put the weight back as ballast where 'I' choose.
As an aside, what sort of Hp have you guys been getting on a GTA engine with only removing cats, new exhaust (from first flange back) and re-tuning? One of the local specialists is an agent for AutoDelta so he has done all the 3.7 ltr conversions but has not got any benchmark info on the base GTA engine with no internal mods.
As always, any and all information is appreciated. At this rate I may have to put Alfaowner.com signage on the car!