Octane and knock
 

The results from our Vampire test on an F150 HD show that a drop of two octane points requires 16?? of retard to quell the resultant knock at low RPM.

Very easy to see now why a load of sub par fuel can destroy an engine with a "safe tune".

Vampire knock controller rules!!!

Video clip showing Vampire in action on F150
 

Here's a clip showing the Vampire knock controller in action on Stew's F150:

http://www.lightningrodder.com/forum...8969#post38969