Not related to a subaru as such, but what is the difference between a fuel pressure regulator fitted to a normally aspirated car, and to one from a turbocharged car??
They both have a vacuum/boost feed to the regulator from the inlet manifold, but would a normally aspirated regulator respond the same way a turbo one would when boost pressure is applied to it???
And for aftermarket regulators, is there any difference again for turbo use, or N/A use??

 

The only difference is the operating range. On a normally aspirated car the regulator will generate maximum rail pressure with atmospheric pressure in the manifold (approx)which equates to wide open throttle. With a turbo it will do this at max boost.

 

I know that, but if you used a N/A regulator, an a turbocharged motor, would the fuel pressure rise in a sensible manner with boost, seeing as it was never designed for positive pressure.

 

IIRC they are both the same except that they are set up at atmospheric pressure (vacumn disconnected)on turbo cars..
This is so that the fuel pressure will not raise until the pressure is positive..
n/a cars are set up with the vacumn connected so that the fuel pressure increases straight away..
Think that makes sense..????
rob

 

Found on the web : FSE Power Boost Valve aka Fuel Pressure regulator :-)

Anyone had any experience with this product ? They claim
better throttle response, acceleration etc....

 

I changed mine at the same time as my puel pump...
Definate improvement, much smoother pick up
Rob

 

btw. my Impreza is a n/a car

Just looking to get that little something extra out of it ;-)