Do they both have timimg built in them ? If so , how much n both units ? Thanks, Bobby

i can tell you that yes they both having timing advance...the SPX has ALOT more than the comp 07 but i cant tell you exactly how much.

nick

The 2007 was a nice speed control. It has much less timing then the SPX.

What is your application? Offroad with limited traction is way different then 12th scale carpet.