structual help (lightening a track car)

[Wiggles]

Might it be worth ditching the door Glass and mechanism and fitting one of those window nets instead? (what's the proper name for them?)
Gives you fresh air, weighs bugger all and you can still get out in a hurry.

Not so good in the rain between events though.

[Disturbed1]

or for security while parcked on the driveway haha

[Wiggles]

True, but racing is all about compromise.

[dave368]

Suggestion, try taking the front guards off the car, get a 9" flap wheel on a 9" grinder and skim the inside of the guards. You're not going to save huge amounts of weight but you asked for cheap ideas. You could get a weight saving of around 15-20% per guard.

I assume you've already taken out all underbody tar etc.

Personally, without a welded in cage I think you'll find that the structural integrity is only helped a small amount with the bolt in. I'd steer clear of removing large chucks from structural areas around the B-pillar but see if you can remove the extra bracing behind the seatbelt mounts whilst leaving the outer skin in place. Is your cage tagged to the top seatbelt mount point? This helps a lot in case of a roll with a bolt in cage (it allows the force to be transferred over a longer period of time which is the aim in an accident).

I assume you are running a welded diff? If you are consider getting a spool made up because there would be a good 4-5kg weight saving on a quality spool compared to a welded centre. Brunton's Engineering do them for around $400-500 and they save rotating mass at the same time which will help with reducing drivetrain inertia.

Cheers,
Dave

[takai]

Cheap and simple one, which you wont be pinged for if you are drifting is to remove the rear quarter windows and replace with 1.5mm acrylic rivetted to the chassis.
Doesnt reduce airflow, and would be a couple of kilo lighter.