iPhone Screenshots


Would you make a good drag racer? Maybe you already race and need a little more practice. Test and improve your reaction times with the Haulin Azz practice tree

Includes 0.000, 0.400 and 0.500 green light options, delay box, roll out adjustments, Sportsman and Pro trees.

- Have it with you wherever you go. Practice anywhere... at the track, lunch break, between rounds, in the bathroom

- Keep your mind sharp in between rounds

- People will wonder what you are doing with your phone!

A must have for any drag racing wishing to improve their reaction times and round winning chances or the casual user wishing to test their reflexes and reaction times.

Ratings and Reviews

4.0 out of 5
66 Ratings

66 Ratings

Boyman9 ,

Download it

I like this app a lot. It's easy to use and it's good practice! I'm not quite sure how accurate it is but in my book this is a keeper! 🌟

MasMolester ,

IOS 11 Needed!

I use this every raceday and because of IOS11 it stopped working!
I believe the developers should really look into just updating for IOS11 support, no need to change anything in the game.

Please bring this back, I need this or need to get a real practice tree! (This is cooler)

Mitch mays ,

Doesn’t work

It’s been months and still no update. How about updating or give us our money back.
Over a year still no update took our money and ignored the fact that your app quit working. If you are going sell an app it needs to be updated to keep it working. That’s just common sense that it will need to updated to keep working. If you have an iPhone don’t buy it because it doesn’t work

App Privacy

The developer, Virtual Dyno, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like