raverthug

Im mounting my boost controller and Fuel pressure regulator on a bracket next to each other. Can I run 1 line in and T it to each or does the FPR need its own dedicated vacuum line to avoid fluctuations?

schuhie

Generally, they should get their own lines but because of where each should be sourced.
You should source the boost controller line pre-throttle body and the FPR should be sourced post-throttle body(intake manifold).

hutch959

iTrader: (18)

^^ this is correct...

raverthug

Perfect. Thank you

tunermt

This is correct: Wastegates are intended to only see boost pressure, vacuum can damage the diaphragm in a wastegate.
fpr on the other hand needs to reference manifold pressure (vacuum and boost).

240Z TwinTurbo

iTrader: (25)

It is advisable to keep pressure references separate when possible, but running the boost controller and FPR off a single line will not affect anything.

LetsGetThisDone

iTrader: (1)

I would not reference boost control from a post-throttle body source. You will lose boost pressure, closing the gates, before the turbo looses drive pressure. Not a good scenario.

240Z TwinTurbo

iTrader: (25)

it depends on whether he is referring to the solenoid or an actual boost controller. Boost controllers reference boost from the intake manifold, but the solenoid references pre TB. My boost controller (profec B) tee’s off the FPR line with zero issues. My gtr references boost control from the intake manifold just the same as the EVO.