To vacuum advance or to not to vacuum advance?????
Well that is the question!
The mob that did the last dyno tune on the ute blocked off the vacuum advance, saying it is only really there to help with fuel economy at light throttle - but couldn't really explain to me what the gain of disconnecting it is ... to me it only comes into play at partial throttle, and when you want the neddies the total mechanical advance is the only thing happening because there is no vacuum, and the distributor will advance to whatever the mechanical advance is set to and that is it.
In my application, I am not necessarily chasing the last ounce of power out of the engine, but some extra fuel economy never goes astray, especially when we are talking 150 -200km effective range when towing the van! (dodgy fuel gauge below quarter tank is also a factor here :roll: :roll: :roll: :roll: )
The dyno mob supposedly graphed the distibutor, so I am wondering if it is desireable to run a vacuum advance, and if so if I will need to regraph the distributor to do so?
All thoughts welcome!