rbray,
I"ll do this as one of my more serious posts.
My wife has about the same lung capacity as you stated, and is on inhalers. She has what is called COPD (I believe).
She drove the Cobra at Sebring pretty hard for about 10 laps, and it whooooooped her. She was done for the day.
Best advice is seek the advice of your own doctor first about your general health, and then your Cardio Pulmonary physician about your own strenghts and weeknesses. If you are taking inhalers, I assume that you have a CP Dr.
Best advice for all concerned is play it safe and seek professional advice.
Don't ask Dr. Semko, he'll tell you that you have a ingrown toenail.
Dr. Terry
Amateur OBGYN
