Aftermarket fuel pressure regulator - Any real gains?
Posted: Thu Dec 12, 2013 10:27 am
With Classic Japan being a great day 2 weeks ago, I have found again the desire to do something to the HOLK.
Whilst what I really want to do will take me a long time, there are little things I can do on and off over few weeks ends. One of those is the engine bay.
As some of you know, the HOLK runs a F5A DOHC from an Alto Works.
Fuel comes directly from a Bosch High pressure pump (mounted externally underneath the petrol tank) and gets to the EPI: any surplus goes back to the pump via a return line.(no lift pump or swirl pot). The arrangement has worked well for several years, even if not ideal.
I am now thinking of installing an aftermarket fuel pressure regulator, both to improve efficency and, whilst cleaning up the engine bay, for that w#nk factor (I am already replacing all fuel lines with braided ones).
Do you guys know if the F5A Dohc has already an inbuilt fuel pressure regulator? If so, do I need to blank it off?
Should I expect an improvement in fuel economy/efficiency?
Paride
Whilst what I really want to do will take me a long time, there are little things I can do on and off over few weeks ends. One of those is the engine bay.
As some of you know, the HOLK runs a F5A DOHC from an Alto Works.
Fuel comes directly from a Bosch High pressure pump (mounted externally underneath the petrol tank) and gets to the EPI: any surplus goes back to the pump via a return line.(no lift pump or swirl pot). The arrangement has worked well for several years, even if not ideal.
I am now thinking of installing an aftermarket fuel pressure regulator, both to improve efficency and, whilst cleaning up the engine bay, for that w#nk factor (I am already replacing all fuel lines with braided ones).
Do you guys know if the F5A Dohc has already an inbuilt fuel pressure regulator? If so, do I need to blank it off?
Should I expect an improvement in fuel economy/efficiency?
Paride