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 out of 5

43 Ratings

43 Ratings

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)

Amazing App


Please bring this back. I used to use this all the time and it’s very useful for working on reaction time. A few of the trans brake guys I know absolutely love it too. Extremely useful.

bring back the game


the practice tree is fine but what I really want is the old game back. I never got the chance to buy it but it looks like fun.


Ron Hamm
15 MB
Requires iOS 4.2 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 9+ for the following:
Infrequent/Mild Profanity or Crude Humor
© 2012 Haulin Azz Drag Racing
In-App Purchases
  1. Full Version Practice Tree $1.99


  • Family Sharing

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

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