I am tuning a friends 04 dirtymax. I have followed the tutorial for the timing calculator, although I think I am doing 50% when most seem to recommend 20%, but I don't know how to change for 20 instead of 50. What other changes should I make? Also how do I change the speedo for taller tires? In my gas trucks I just plug in the tire hieght and thats it. That option doesn't seem to appear for this truck. Thanks, Chase.
1stchangesdirtymax.hpt