I was wondering where most poeple hook up their boost reference fuel preesure regulator to? I also need to know where you measure boost pressure at before or after the throttle body? I have heard both. Any help will be much appreciated.

 

FPR....source b4 the TB
boost gauge.....brake booster hose going to back of intake.

 

If your looking for boost to the engine that would be after the throttle body. As for the fpr also after the tb. If you use pressure before the intercooler then your dealing with the presure drop across the core. So boost would be lower. The boost difference from before and after the I/C is about 2 psi if the intercooler is working.

 

but you also have to take into account that some FPR's will drop pressure when in vacuum so when youre not in boost the fuel pressure will drop quite a bit like when you let out of the throttle and pull alot of vacuum