[hat_man]

Can someone please help me out with the relationship between vacuum and FE? I'm not really sure exactly what vacuum's function is in an engine either. IIRC low vacuum is the engine running more efficiently right? I have an idea for a mod/improvement but I'm not quite sure how to implement it. I wanted to ask about it, but need to understand how vacuum works and the terminology first.

Basically, I want to temporarily hook up a vacuum gauge and see what RPM range my engine likes. The "sweet spot" so to speak. Then some fancy ciphering using my tire size and transmission gear ratios and various rear end gears to try and get as close to that "sweet spot" at 55-60 mph in 4th gear and 65-70 in 5th gear. Maybe Ford has already done that, I don't know.

I guess it all starts with finding out where my engine is happiest. That's where learning about vacuum comes in.

Thanks