What pressure should i set my aeromotive (#1309) fuel pressure regulator at?
 

I'm very much looking forward to installing this. but to be careful what pressure should i set it at?

40psi

I was wondering the same thing. Most injector places that flow and clean injectors test the injectors @43 psi. It shouldn't hurt to match that right?

I just ordered the same FPR aeromotive 13109.

Set "0" manifold to 40psi - this is the Mazda spec.
Use this especially with a stock ECU.
If you're running an aftermarket stand-alone EMS, it doesn't matter...
Rule of thumb is higher the fuel rail pressure, better the atomization...
Just be careful about what your max boost pressure is and what your fuel pump can handle!
I would try and keep maximum fuel rail pressure under 60psi unless you know for sure your fuel pump can handle it.

If max is 60psi and your max boost is 15psi (assuming 1:1 rate on FPR), 60psi - 15psi = 45psi, so you can set the FPR "0" manifold to 45psi and tune the fuel maps.

Some of the high pressure capacity fuel pumps (i.e. Bosch 044) can handle slightly higher fuel rail pressures up to 70psi and beyond...

If all that made your head hurt, just set it around 35psi to 40psi. :)


-Ted

Oh.. and by "0" manifold pressure.... that means unhook the vac line from the FPR and set it to 40 PSI, then hook the vac lin back up... fuel pressure will then drop when the FPR sees Vac...

I set mine to 38 static and it reads about 30 on the gauge at idle at 17 inches of vacuum.

ted fuel pumps may support higher rail pressure at 70 psi, but most injectors can't handle anything over 75 psi. they're likely to be held open all the time with that much pressure.

Nippondensos have no problem running up to 90psi (i.e. they don't lock up).
We've done it.

In fact, you get more fuel up to about 70psi.
Going above 70psi does not get you more fuel...at least with the ND's.

I like to go with my first-hand experience here rather than base it on heresay.


-Ted