Advancing cam timing

[acox99 74 1 Cars]

Has anyone played around on a dyno or rolling road with advancing a standard 1.6 cam 2-4 degrees on a fast road engine with standard injection but flowed head, I wondered what effects it had, whether it lost at the top & gained torque down low as you would expect or if it killed it completely, same with retaking, if it gained up top but lost low down. 
 

 

[welshpug 1,661]

Never done it on an 8v, have done with a gti6, heard about it from a friend that knows a guy that has run group N 306 rally cars.

 

Certainly  the theory  is there that advancing the inlet bumps the torque and makes it less peaky, bringing the power peak a little lower as well,   definitely  made a difference but i dont know what specific gains are.