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Author Topic: Adjustable fuel pressure regulator  (Read 2933 times)

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Offline denmach1

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Adjustable fuel pressure regulator
« on: August 06, 2014, 07:09:57 PM »
I am putting a 85 fuel injected turbo in my 77 Cruisin Wagon. Does anyone know how to install an aftermarket fuel pressure regulator on this fuel rail? The stock one bolts directly to the rail with a triangle shaped plate with two ports. My aftermarket regulator has barbed fittings. I will be running bigger injectors and need a little flexibility with my fuel pressure. Any help is greatly appreciated. 
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Offline amc49

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Re: Adjustable fuel pressure regulator
« Reply #1 on: August 07, 2014, 05:10:39 AM »
Better hope it works in your correct range, there's 15 psi EFI, 30, 45, and around 60, none of the parts interchange, the adjustability is only a narrow range and should match (overlap) your original stuff. If you got really high pressure stuff there barbs won't cut it unless you take extraordinary measures. Why modern stuff does not use that method of hose attachment any longer. The hoses will simply work their way off to come off suddenly and blowtorch city. Heck even the hoses can blow out if not rated for use there.

The two ports is for a bypass system, if you don't have that on the aftermarket it won't work. Need one in, one out and the bypass back to tank. 3 outlets in all.
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Offline denmach1

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Re: Adjustable fuel pressure regulator
« Reply #2 on: August 07, 2014, 06:03:07 PM »
Thanks for the input. Do you know if there is an adjustable regulator that bolts in to the stock location without modification?
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Offline amc49

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Re: Adjustable fuel pressure regulator
« Reply #3 on: August 07, 2014, 06:49:22 PM »
I personally do not although there could have been at the time they were popular. Go to the turbo section here and someone may know......

May be helpful to know if that early system ran using MAP or MAF, probably MAP and not as adjustable on air/fuel as MAF is. The software is not as wide ranging to change since the air/fuel maps are pretty much it, not able to on-the fly-learn as well as MAF is. So, you can have the hard parts but the software not as able to do what you want there. I have watched others struggle with that.

Technically, any of those plate type regulators that I've seen disassembled could easily be modded to be adjustable if one could only figure out how to seal it up to not leak afterward. You simply drill hole for a stud that runs against the internal spring to increase/decrease the spring value.
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Offline denmach1

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Re: Adjustable fuel pressure regulator
« Reply #4 on: August 07, 2014, 06:58:15 PM »
Thanks for the help. The guy doing the tuning for me(using a Moates F3) is going to use the stock pressure for a baseline. I just wanted some flexibility in case we need it. I guess we'll see when we get to that point. Thanks again.
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Offline 82expghost

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Re: Adjustable fuel pressure regulator
« Reply #5 on: August 09, 2014, 12:46:36 AM »
your tuning it to make it run better, you want to upgrade the fuel rail with a not really safe way, it would be better to just upgrade the fuel rail and get a aftermarket fpr. and it will make it look cleaner.
http://www.ebay.com/itm/SVO-Merkur-Tbird-Ranger-2-3-Turbo-Performance-Fuel-Rail-/191211738590?pt=Motors_Car_Truck_Parts_Accessories&hash=item2c851b95de&vxp=mtr#ht_459wt_900

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Offline 65ShelbyClone

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Re: Adjustable fuel pressure regulator
« Reply #6 on: August 09, 2014, 03:16:06 AM »
Quote from: denmach1 on August 07, 2014, 06:03:07 PM
Do you know if there is an adjustable regulator that bolts in to the stock location without modification?

A regulator for an '87-93 Mustang 5.0 will fit the 2.3T rail. Super common and good ones can be had for less than $100.

Your tuner is using a J3 chip (Moates F3, Quarterhorse, etc) that provides full control over what the injector does, so there really should be no need to fiddle with fuel pressure. All that is going to do is throw off the injector flow rate and offsets, which is a problem if you don't have a Ford-style calibration summary that provides those values over a range of pressures(and voltages).
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Offline amc49

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Re: Adjustable fuel pressure regulator
« Reply #7 on: August 09, 2014, 07:47:59 PM »
X2, if you already have bigger injector then using higher pressure may be wrong, wrong. I'd start from stock pressure first.
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Offline 65ShelbyClone

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Re: Adjustable fuel pressure regulator
« Reply #8 on: August 09, 2014, 07:54:57 PM »
The only good reason I would increase fuel pressure beyond the stock Ford spec of 39psi is if the injectors were characterized at the industry standard 43.5psi.
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Offline denmach1

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Re: Adjustable fuel pressure regulator
« Reply #9 on: August 10, 2014, 06:04:23 PM »
I won't be using an adjustable regulator. After talking to the guy who is doing my tuning, he programs the chip using stock pressure as a baseline. Thank you guys for all of the input. The guy doing my tuning is Willie Lynch at Dirtydirtyraci ng.com. He has a great reputation and will email tunes if you need them.
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