Hi Bartek,
The car looks really cool!
Here are a few things that come to mind to help with weight loss:
- Are the original, heavy-duty seats still installed?
- Radio, all speakers, and amplifiers.
- Interior door panels.
- Replace the battery (lead-acid battery) with a lighter lithium-ion battery.
- Air conditioning system including compressor (air conditioning control unit: completely disable, otherwise error codes will appear).
Is there a video of the racing car?
Best regards, Rainer.