Fuel

Octane

Just as in the motorcycle, if an engine’s compression ratio remains stock, you can use premium pump fuel.  This may not be legal for certain classes, such as SCCA FB, P1, and P2.  During SCCA competition weekends, best is to use what is sold at the race track, if you have any doubts.

Higher octane fuels certainly do not hurt, but do not use ‘octane boosters’.

Fuel Level

The simplest way to be sure of the fuel level is to pump the tank dry using the fuel sample port, then putting in a known amount of fuel.  Connect a hose to the fuel sampling port, and turn on the ignition to activate your fuel pump – this will drain the tank.

For reduced hassle until you are trying to get the last few tenths out of your car, you can simply top off the fuel tank before each session.

Consumption/Mileage

You will use 3.5 to 4 gallons of gas in about 30 minutes of racing with a 1000 cc engine, more for 1300cc and larger engines.  Some tracks will use more fuel due to higher proportion of time spent at full throttle, such as Road America.

Capacity

Early rear fill and side fill Stohr fuel cells hold about 8 gallons. The current specification Stohr side fill cell has a capacity of 9 gallons. If your car is currently using one of the early fuel cells, we strongly recommend updating this safety feature as soon as possible. Fuel cells should be replaced every five seasons or 10,000 track miles.