Quote:
Originally Posted by 01somta
What is the vacuum port used for on a N/A application? Would it very benefial to use?
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under vacuum (idle/cruise) it pulls a few psi from the fuel pressure, and then under load when the vacuum drops you get a few psi boost in fuel pressure. It's a common way for the OEM to do it, but I've never done it with aftermarket efi naturally aspirated. It may not work properly with the fpr in the rear of the car due to the line length and possible slow reaction to fuel pressure changes because of the line length.
With forced induction it helps add fuel pressure under boost to compensate for the manifold pressure under boost. Again, with a rear-mounted fpr I didn't run a line but I've always wanted to see if the line length really affects it that much. Everyone talks like it may be an issue, but I've yet to talk to a single person who's actually tried it. As is on mine currently I have 52 psi normally with about 56 psi under boost and/or above 3000 rpms, the increase coming from using the Aeromotive fuel pump controller.
Jody