Originally Posted by dyezak

According to the owners manual the 370z holds 19gal of unleaded gasoline.

According to imperial measurments gasoline weighs between 5.9 and 6.5lb/gal depending on the fuel mixture.

According to math (using an average weight of 6.2lb/gal for gasoline) a full tank of gas on the 370z would weigh 117.8lbs....

When I autox a car I run at 1/4tank of fuel, no spare, no jack, removed floormats. Based on the above information in this thread we can assume that a B Stock SCCA Solo II 370z would weigh:

Stock (full tank of gas): 3,342lbs
minus 3/4 tank of gas: 88lbs
minus spare (conservative): 30lbs
minus jack/floormats: 5lbs
TOTAL: 3,219lbs

This doesn't even take into account the fact you can run lighters wheels/tires (20-30lbs here), hollow front anti-roll bar (2-3lbs here), and a lighter weight exhaust (prepare to loose around 30-40lbs here).

I think it's safe to say that a B Stock SOLO II car can be under 3,200lbs race ready.