Regulated return pro/con?
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From: Dalton,Ga
Regulated return pro/con?
what is the pro and cons of a regulated return verses the FRX (installed with black spring)?i am looking to pull the trigger in the morning and wondering if its worth the expense. i am using the Yarbro fuel pump and normal driving it holds 65-70 psi, when i push it fuel pressure frops to 50psi..Will the RR fix this or do i need to look at a different pump??
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Regulated return will not help with loss of pressure. It will help you get less aerated fuel into your cylinders, and make the engine run smoother.
What you may need is a pump that will supply the fuel your injectors at whatever speed you choose. When you romp on the throttle, the pump cannot keep the fuel delivery up. That is why you loose pressure.
You need to figure out if the pressure loss is that big of a deal based on how you drive, then decide if you want to get a higher volume pump.
If you decide to get a higher volume pump, can the components actually supply it to the cylinders? There may be other changes needed to get the supply to the
injectors and cylinders.
If you want to do a regulated return, do so. Just don't expect it to keep fuel pressure up under full throttle or heavy foot.
What you may need is a pump that will supply the fuel your injectors at whatever speed you choose. When you romp on the throttle, the pump cannot keep the fuel delivery up. That is why you loose pressure.
You need to figure out if the pressure loss is that big of a deal based on how you drive, then decide if you want to get a higher volume pump.
If you decide to get a higher volume pump, can the components actually supply it to the cylinders? There may be other changes needed to get the supply to the
injectors and cylinders.
If you want to do a regulated return, do so. Just don't expect it to keep fuel pressure up under full throttle or heavy foot.
Senior User
Joined: Mar 2012
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From: Minneapolis
Joey I have the regulated return from what was known as ITP diesel. Here is the link. Driven Diesel 7.3L Standard Regulated Return Kit . I am not to familiar with the frx but with the system I have you can adjust the fuel pressure to what you want, I have mine set at 70-71.
Senior User
Joined: Mar 2012
Posts: 293
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From: Minneapolis
Regulated return will not help with loss of pressure. It will help you get less aerated fuel into your cylinders, and make the engine run smoother.
What you may need is a pump that will supply the fuel your injectors at whatever speed you choose. When you romp on the throttle, the pump cannot keep the fuel delivery up. That is why you loose pressure.
You need to figure out if the pressure loss is that big of a deal based on how you drive, then decide if you want to get a higher volume pump.
If you decide to get a higher volume pump, can the components actually supply it to the cylinders? There may be other changes needed to get the supply to the
injectors and cylinders.
If you want to do a regulated return, do so. Just don't expect it to keep fuel pressure up under full throttle or heavy foot.
What you may need is a pump that will supply the fuel your injectors at whatever speed you choose. When you romp on the throttle, the pump cannot keep the fuel delivery up. That is why you loose pressure.
You need to figure out if the pressure loss is that big of a deal based on how you drive, then decide if you want to get a higher volume pump.
If you decide to get a higher volume pump, can the components actually supply it to the cylinders? There may be other changes needed to get the supply to the
injectors and cylinders.
If you want to do a regulated return, do so. Just don't expect it to keep fuel pressure up under full throttle or heavy foot.
Post Fiend
Joined: May 2009
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From: Pea Ridge, AR
What injectors do you have?
Elder User
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Depending on what injectors you are using, a remedy for fuel pressure drop when your foot is in the pedal hard would be installing dual stock fuel pumps with a 5/8" fuel tank pick-up/fuel supply up to the dual pumps. You really shouldn't see any significant fuel pressure drop when mashing the throttle until you start to get into some of the hybrid injectors. That's what I've been told before by others who know this stuff better than I.
Drake
Drake
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From: Minneapolis
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Post Fiend
Joined: May 2009
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From: Pea Ridge, AR
That's good but also stock, Joey is running 160cc maybe 250cc/100%'s IIRC so a larger volume of fuel and the ability to drop it twice as fast per given PW.
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Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
Back to the original question...
The difference is adjustability really, as stated you will need more volume, either through 2 pumps or something like the Airdog or Fuel lab setups.
Although at 50psi WOT I probably wouldn't worry about it.
what is the pro and cons of a regulated return verses the FRX (installed with black spring)?i am looking to pull the trigger in the morning and wondering if its worth the expense. i am using the Yarbro fuel pump and normal driving it holds 65-70 psi, when i push it fuel pressure frops to 50psi..Will the RR fix this or do i need to look at a different pump??
Although at 50psi WOT I probably wouldn't worry about it.
Senior User
Joined: Mar 2012
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From: Minneapolis
Good catch, I stand corrected......
Lead Driver
Joined: Jun 2003
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From: Damon (South East Texas)
Here is a video of a 7.3 with 250cc/200% Rosewood injectors, running a single Walbro fuel pump and Dieselsite CPR regulated return system. There is almost no pressure drop and this engine dynoed at 566 rwhp and 1189 tq. IIRC, Joey's injectors are 225/100's.
Stabilized Fuel Pressure.avi - YouTube
Stabilized Fuel Pressure.avi - YouTube
Post Fiend
Joined: Feb 2002
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From: Carhenge
With the full RR folks usually get rid of the check valves in the back of the heads that appear to be restrictive to fuel flow. They also typically replace the steel fuel lines on top of the engine that are prone to cracking and leaking with larger diameter flexible hose.
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From: Dalton,Ga
Joey I have the regulated return from what was known as ITP diesel. Here is the link. Driven Diesel 7.3L Standard Regulated Return Kit . I am not to familiar with the frx but with the system I have you can adjust the fuel pressure to what you want, I have mine set at 70-71.
I have looked at the airdog.The seperation and filtration is great but I dont see how it will help with pressure..Correct me if I am wrong,but what I see is its has a pre pump to feed the main pump and does it at 10 PSI.
Does anyone sell a kit to set up dual pumps?? I am absolutely no good at piece milling anything.
Lead Driver
Joined: Jun 2003
Posts: 8,298
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From: Damon (South East Texas)
That is the kit I am looking at..The FRX is Riffraffs verson of a regulated return.Its adjusted by the spring that is installed.
225cc/100%
That is what I was wondering about..is 50PSI enough to feed the injectors at WOT?Not that I drive like that,but I want it right.Also, I was hoping it might cure a romp,romp at idle and I also have a slight surge going on at low speeds.. I have looked at the airdog.The seperation and filtration is great but I dont see how it will help with pressure..Correct me if I am wrong,but what I see is its has a pre pump to feed the main pump and does it at 10 PSI.
Does anyone sell a kit to set up dual pumps?? I am absolutely no good at piece milling anything.
225cc/100%
That is what I was wondering about..is 50PSI enough to feed the injectors at WOT?Not that I drive like that,but I want it right.Also, I was hoping it might cure a romp,romp at idle and I also have a slight surge going on at low speeds.. I have looked at the airdog.The seperation and filtration is great but I dont see how it will help with pressure..Correct me if I am wrong,but what I see is its has a pre pump to feed the main pump and does it at 10 PSI.
Does anyone sell a kit to set up dual pumps?? I am absolutely no good at piece milling anything.
I don't think fuel delivery is the issue, for the romps and surge, as far as the pump is concerned. I had similar problems that were solved with live tuning.
I feel the Walbro should be more than adequate to provide the fuel you need.
Where are you taking your fuel pressure reading from?
Thread Starter
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Posting Guru
Joined: Jul 2008
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From: Dalton,Ga
Here is a video of a 7.3 with 250cc/200% Rosewood injectors, running a single Walbro fuel pump and Dieselsite CPR regulated return system. There is almost no pressure drop and this engine dynoed at 566 rwhp and 1189 tq. IIRC, Joey's injectors are 225/100's.
Stabilized Fuel Pressure.avi - YouTube
Stabilized Fuel Pressure.avi - YouTube
Tell me more..Where are they located??