fuel pressure regulator
Joined: Nov 2009
Posts: 166
From: South Dakota
On a fuel injected car, people put them on to flow more fuel through the injectors by turning the pressure up. This is especially critical on nitrous and forced induction engines, where air/fuel ratio is critical. On a stock engine, it will do pretty much nothing except, decrease your fuel economy.
Joined: Feb 2008
Posts: 6,449
Don't waste your money.
The idea with raising the fuel pressure level is to get more headroom out of your injectors. So, for example, if you had done a lot of engine mods and your injectors were running static (constantly open) at WOT at max RPM- you could increase fuel pressure to make the injectors squirt more out when they do open, lowering so they aren't being held open as long (basically making it seem like you have bigger injectors than you really do).
However, one thing to keep in mind is your fuel pump can only put out so much volume at a certain pressure- so if you bump pressure up, volume goes down (its harder to push the fuel), so you've got to be careful going too crazy unless you know the flow at different pressure levels on your pump to make sure you don't drop volume too much and run out of pump.
They also make non-adjustable FPR's that have a higher pressure rating as well, taking away the adjustability if you know what pressure you want.
Honestly though, you've got to think about why you would want one- if its a tuning issue (running too rich / lean, etc) then IMO you're better off doing real pcm tuning. If you're running out of injector- then just get bigger injectors.
The idea with raising the fuel pressure level is to get more headroom out of your injectors. So, for example, if you had done a lot of engine mods and your injectors were running static (constantly open) at WOT at max RPM- you could increase fuel pressure to make the injectors squirt more out when they do open, lowering so they aren't being held open as long (basically making it seem like you have bigger injectors than you really do).
However, one thing to keep in mind is your fuel pump can only put out so much volume at a certain pressure- so if you bump pressure up, volume goes down (its harder to push the fuel), so you've got to be careful going too crazy unless you know the flow at different pressure levels on your pump to make sure you don't drop volume too much and run out of pump.
They also make non-adjustable FPR's that have a higher pressure rating as well, taking away the adjustability if you know what pressure you want.
Honestly though, you've got to think about why you would want one- if its a tuning issue (running too rich / lean, etc) then IMO you're better off doing real pcm tuning. If you're running out of injector- then just get bigger injectors.
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