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Old 08-22-2019, 12:40 PM   #8
jedi03
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Join Date: Jul 2008
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splicing into other sources is fine...would recommend to those who are just nay-sayers...does it affect it? sure...however its all pulling vacuum/boost to the same degree as the port on the manifold, on my sti the factory fpr is on cylinder 4 exclusively...through research and monitoring the vacuum signals it was found there was a lot of variation in signal so an aftermarket company found that splicing into the BOV vacuum line the signal was more consistent and thereby was able to keep the fuel pressure more stable...as also mentioned there is a port that is closed at a certain time...should this be used for the fpr? no as your pressure will not be where you want it when the throttle is closed...the question on the block is yes, its splicing the vacuum in a larger block which also changes the signal, to what degree? will have to see data on it...the bov, tap another port into the manifold or throttle body! i know the greddy/freddy manifiolds have several additional ports for various vacuum needs, just do research on which will give the signal you need/want!
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