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FPR vac connection
40inches - 20/9/15 at 12:11 PM

Is it necessary? What are the advantages to connecting it?

CosKev3 - 20/9/15 at 12:24 PM

Alters the pressure according to the vacuum applied iirc?

Rising rate fpr.

coyoteboy - 20/9/15 at 02:08 PM

It's for boosted engines, so you can maintain relative fuel pressure, or for engines where you can use a varying fuel pressure to effectively increase the resolution of control of fueling

40inches - 20/9/15 at 02:25 PM

quote:
Originally posted by coyoteboy
It's for boosted engines, so you can maintain relative fuel pressure, or for engines where you can use a varying fuel pressure to effectively increase the resolution of control of fueling


So reduces fuel pressure, say at tick over, to maintain a steady idle speed, rather than relying on altering injector duty cycle?
Not had to assemble a fuel injection system before, so a bit of a Dumbo, but learning fast

coyoteboy - 20/9/15 at 02:37 PM

Yeah, so they can be set up to either stretch the useful range by increasing pressure with load, or drop it around idle to give more control. I've never set one up (on an engine, I used it in a very strange lab experiment) but you can see they give some flexibility. If you want to just get a system running you don't //need// to connect the hose.

40inches - 20/9/15 at 02:41 PM

quote:
Originally posted by coyoteboy
Yeah, so they can be set up to either stretch the useful range by increasing pressure with load, or drop it around idle to give more control. I've never set one up (on an engine, I used it in a very strange lab experiment) but you can see they give some flexibility. If you want to just get a system running you don't //need// to connect the hose.


Got it A case of if it's there, why not use it.

britishtrident - 21/9/15 at 06:42 AM

There are some good videos on YouTube on the operation and testing of fuel pressure regulators, the - `Schrödingers box` channel or `ScannerDaner` channel are good places to look.