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Old 02-09-2012, 05:48 AM
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Regulated Fuel Return?

I have got a question on RR.

OK if a Aeromotive A1000 puts out a constant pressure rating of 80psi at a flow rating of 500 lbs/hr. pre injector. Then you have a RR set at 65psi post injector. Wouldn't the injectors be supplied with 80psi?

If so, why use a RR system? Or would it be best to install a pressure regulator pre injector to regulate the pressure to 65psi. or desired fuel pressure rating?

I'm not trying to stir up anything. Just curious.
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Old 02-09-2012, 06:43 AM
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I have wondered this exact same thing. I hope someone chimes in.
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Old 02-09-2012, 07:46 AM
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If you set the regulator at 65 psi the pump works to maintain that pressure, at 65 psi the a1000 is hardly any strain. The pumps max flow rating doesn't mean thats what its putting through the fuel rails/injectors the regulator decides that.

The idea of a regulated return is to supply fuel to the injectors and whatever fuel not use is sent back to the tank AFTER the injectors not before like the stock system or airdogs/fass. This provides the injectors with constant and equal fuel pressure in both rails and injectors.
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Old 02-09-2012, 08:01 AM
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Thats kinda what I thought, I'd never actually heard someone explain it though. trying not to get off topic, but does an injector getting 65psi work better/ make more power than one running at 50psi?
Sent from my HTC Hero S
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Old 02-09-2012, 08:12 AM
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Quote:
Originally Posted by pizza pig View Post
If you set the regulator at 65 psi the pump works to maintain that pressure, at 65 psi the a1000 is hardly any strain. The pumps max flow rating doesn't mean thats what its putting through the fuel rails/injectors the regulator decides that.

The idea of a regulated return is to supply fuel to the injectors and whatever fuel not use is sent back to the tank AFTER the injectors not before like the stock system or airdogs/fass. This provides the injectors with constant and equal fuel pressure in both rails and injectors.
OK that clears up things for me.

Also I'm assuming that a RR system will eliminate the "dead head" effect? Because having the back of the heads blocked off would put more strain on the fuel pump?
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Old 02-09-2012, 08:16 AM
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Is an RFR system better than the Air Dog II or are they not really comparable?
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Old 02-09-2012, 08:20 AM
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How about this. The RR maintains pressure up to 65psi THEN opens to allow fuel above 65 to by-pass to the return. So when under demand the RR would remain shut since the 80PSI would be feeding the injectors. One can assume the PSI at the RR will be lower than 65PSI so no fuel would be returned. (Kind of sounds like a dead head)
Once the fuel demand has dropped the RR should see a higher PSI (let's say it sees 80PSI). The RR opens to allow fuel pressurized over 65psi to return. This protects the potential of o-ring failure.

If you consider the OEM set up it does the same thing but the RR opens prior to feeding the injectors which should prevent the o-ring issue as well. As long as the OEM pump is providing adequate pressure it does the SAME thing as any RR setup.

I don't recall seeing where anyone has posted PSI output of the HFCM.
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Old 02-09-2012, 08:22 AM
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theyre not really comparable in my opinion

A regulated return is only good if your fuel pump is good!
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Old 02-09-2012, 08:22 AM
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Quote:
Originally Posted by jimmyv13 View Post
Is an RFR system better than the Air Dog II or are they not really comparable?
RFR: does not filter or remove air. Just provides steady PSI

ADII: Filters fuel, removes air, provides steady PSI.
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Old 02-09-2012, 10:28 AM
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Quote:
Originally Posted by HeavyAssault View Post
RFR: does not filter or remove air. Just provides steady PSI

ADII: Filters fuel, removes air, provides steady PSI.
Thank you!

It seems that the RFR system would be a little cheaper, but the ADII makes more sense and a wiser investment. The RFR is simply masking the real problem which is the pump.
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