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I’m wanting to increase the power slowly of a period of time bit by bit

my question is are there any issues running a 1000hp  fuel pressure regulator on stock boost and lines

just so it’s installed and sitting there then the build can work around it

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A regulator that can handle 1000HP worth of fuel has a very large flow passage in it. When you try to run it with a smaller pump at much lower power levels, the regulator's valve might end up running very close to the seat in order to maintain the pressure setting and this can lead to unstable pressure control. If the mismatch is severe enough the valve will have to close to get the pressure up, then it will have to burp open because the closed valve is not regulating pressure, it's just allowing it to rise. So instead of a steady servo-controlled pressure, you get a nasty saw-tooth pressure.

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It's really more a question of how big the fuel pump is, not the amount of power the engine makes. The limiting case is when you are making near full power and using almost all the fuel pump capacity. In that case the reg is going to need to be very nearly closed to keep pressure control, possibly leading to the sawtooth I described above. That same engine and pump, at idle or crusing, is going to need to return a lot of fuel back to the tank, so the reg will be more open and pressure control will probably be fine.

The capacity of the reg is 100% a function of the capacity of the fuel pump. If the fuel pump is a decent size, you'll probably be OK. If the fuel pump is gasping at your 350 whp, then it might not be so rosy. Very hard to say without trying it.

If your pump has higher capacity than stock, then more than likely it will be fine. But no warranty is issued or implied!

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6 hours ago, GTSBoy said:

It's really more a question of how big the fuel pump is, not the amount of power the engine makes. The limiting case is when you are making near full power and using almost all the fuel pump capacity. In that case the reg is going to need to be very nearly closed to keep pressure control, possibly leading to the sawtooth I described above. That same engine and pump, at idle or crusing, is going to need to return a lot of fuel back to the tank, so the reg will be more open and pressure control will probably be fine.

The capacity of the reg is 100% a function of the capacity of the fuel pump. If the fuel pump is a decent size, you'll probably be OK. If the fuel pump is gasping at your 350 whp, then it might not be so rosy. Very hard to say without trying it.

If your pump has higher capacity than stock, then more than likely it will be fine. But no warranty is issued or implied!

if base pressure is 38psi will be ok running a reg that has min of  40psi adjustment? ie a 40-75psi reg?

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Well, either it will have a little extra adjustment below the advertised minimum and you will be absolutely fine, or, it will not, and you will end up with 40 psi which will fatten your mixtures up a tiny bit.

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