Yokomo YR4 MkII

[Dreadstar]

I have one of these older cars in my collection,and actually raced it last week. I've never raced on-road before,so even with a 19x2 Fireball motor in it,I was left way behind.It turned out,that I only had a 22T pinion installed,which would explain why,even after 4 packs,used one after the other,the motor was barely warm.Now the question,how big a pinion can I fit to this car in order to get a decent pace out of her?(By the way,brushless isn't an option).

I'll post up some pics of the chassis later.