Why am I slow?

[lincpimp]

Do you have your slipper tight?

I have a feeling you need a longer road, just because you are hitting full throttle does not mean the truck is at full speed. When I did speed testing with a 10th scale touring car, I picked up 10mph just by moving the radar gun about 200ft down and giving the car an extra 50ft before I started braking. I think you will see the difference with a longer road. How are you determining speed? Bushnell radar gun was what I used.