Originally Posted by Rick Thomson

- I don't think there will be much difference in a drag race anymore, considering the high speeds of stock motors these days. You can see it with all the big races, the modified drivers with 4.0 motors are just 0.2 of a second faster than the 13.5 turns stock drivers. So that won't be a big difference anymore.

- As for efficiency, the stock motors are more efficient than the modified motors, due to a combination of factors. For example a 10.5 won't use as much power as a 5.5, resulting in longer driving times.

- The advantage of racing the SXX Stock Spec with a 10.5 over a GTB with a 5.5 is that a 10.5 will give the car a more smooth feeling making it easier to drive fast through short turns and accelerating out of corners. To compensate this, you would have to lower the power program of your GTB to have that same smooth feeling, giving you less power. Making the gap between the two motors even smaller.

- As for temperature, that really depends on the motor that you're using. When using f.e. a Speed Passion motor it's better not to get it above 85/90 degrees (Celsius) when using a LRP, it not problem when it get above 100.

- Than for the timing, with this one there is one very important thing. When you don't know that much about timing, it better not to mess with it too much, since you could really damage you electrics with it when doing it wrong. So best just to keep that standard.