KR> VW conversion

[Eric Evezard]

Hi,
Can some netters kindly explain why VW manuals give 7 deg BTDC and aero 
conversions give 25 to 28 deg BTDC as the timing.?. How does one "tweak" the VW 
to use 25 to 28 deg BTDC.?
Best Regards,
Eric.
ZU-BMP
ZS-GML