MazdaRx7Racer4Life

I don't have it on yet, I will probably haveit on by wednesday (If I decided to mount it parallel instead of in series) but I would like to know how to adjust the fpr. I know there is a little stud ontop of it which is where you adjust it by but how many times should I turn it, where should it be set, how do I know this?

hIGGI

iTrader: (7)

u simply look at your fuel pressure gauge and adjust :o)

MazdaRx7Racer4Life

OK, to around what pressure should I adjust my FPR to? My mods are your basic TID, Turboback RB Exhaust, FCD, Rewired Walbro fuel pump, rebuild with a large streetport and greddy type s bov. Im boosting about .5-.75 bar.

osdesigns

You should start out from stock fuel pressure.
Have a good fuel pressure gauge connected to the fuel pressure regulator. Turn the key to the ON position, and monitor the fuel pressure. Factory is around 2.6-2.7bar.
So you will just turn the stopper screw on the top of the regulator until the needle says 2.6bar on the gauge.

osdesigns

I hope you got the rising rate fuel pressure regulator. A rising rate will see the manifold pressure and regulate the fuel pressure accordingly.
When the boost increases, the pressure will increase, delivering more fuel. Factor FPR is a 1:1 rising rate FPR. So for every psi of boost, the regulator regulates one more psi of fuel pressure.

Thats also why you just want the key to the ON position while adjusting the FPR. The fuel pump will come on, pressurise the system, while not starting the car. It will be 1 atmosphare pressure, when the car is not running.

MazdaRx7Racer4Life

I did get the rising rate FPR. Its an aeromotive 1:1 ratio of increase. Im guessing I will have toplug in the vacuum nipple to the boost sensor T right?

SBi_Owner

When we installed Jrats, it was hooked to the LIM. We set his pressure to 40psi on startup. We then found that it increased to 52psi on full boost and dropped to 30 on deaccelleration. More tunning will need to be done with the wideband and pressure adjusted. If you need any more help, contact me or Jrat.

MazdaRx7Racer4Life

yeah, but Jrat was running the BNR stage 4 right? For now I would like to run an adequate fuel setup to sustain the maximum boost of the maximum boost of the stock turbo without leaning out. What should I set my regulator to?

Chris Ng

To set your fpr, turn the car on (do not start it) short the yellow fuel pump test connector by the passenger side shock tower, this will allow the FP to run.. adjust the FPR.. base fuel pressure is around 34-40psi ...

Another way of doing this is to start your car.. pull the vacume hose from the FPR.. then set your base fuel pressure...

Because your FPR is a 1:1 rising rate, just like the stock unit, you're not going to use it as a way to "tune" for more fuel on boost... You COULD increase the base pressure so that you get higher fuel pressure on boost, however this will make you run quite rich at idle..

If you purchased the FPR as a easy "cheap" method of tuning your fuel, you should have purchased an FPR that allows you to change the ratio from 1:1 to 2:1 or higher.. that would keep you from running rich throughout the whole board...

MazdaRx7Racer4Life

actually I bought it as an important part of my fuel setup to sustain 400-500rwhp. My next step is a Standalone EMS. It wasn't just a "cheap" quick fix.

MazdaRx7Racer4Life

so I should tune for 40psi?

Chris Ng

38-40 base fuel pressure is fine...

osdesigns

Make sure the rest of the fuel system can keep up with the increased the fuel pressure. I have seen aftermarket fuel pump losing pressure on high fuel pressure. It can be very dangerous.