Skip to main content ↑ ↓
Topic: Benefit of replacing the stock fuel pressure regulator (Read 2449 times) previous topic - next topic

Benefit of replacing the stock fuel pressure regulator

Are there performance gains to be made by replacing the stock regulator with an aftermarket adjustable?  Or is that just hype.  I don't think there's anything wrong with my stock one but if with the bigger fuel pump and injectors,  do I need a better regulator? 

Thanks.
'88 Bird 5.0, TW 170s, HO cam, Scorpion rockers, Explorer intake 70mm TB/EGR, MAF conversion, 24# injectors, 8.8 3.73 disc rear end swap, console swap, leather seats, 11" front discs, 15-1 rack, TC springs all around, x-pipe, BBK headers,  welded sub-frame, unlocked digital speedo.

Benefit of replacing the stock fuel pressure regulator

Reply #1 –
I have a Kirban on mine. It's adjustable, but I have it set to 40psi. I didn't have one at all, and this was new, and wicked cheap, so I got it. Otherwise, I'd have bought a Motorcraft FPR.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Benefit of replacing the stock fuel pressure regulator

Reply #2 –
Quote from: marianadeeps;448468
Are there performance gains to be made by replacing the stock regulator with an aftermarket adjustable?  Or is that just hype.  I don't think there's anything wrong with my stock one but if with the bigger fuel pump and injectors,  do I need a better regulator? 

Thanks.

Unless you have a really sensitive ASS-O-METER, get a dyno tune or spend the afternoon at the drag strip test & tuning, I doubt it's going to make a noticable difference...

Benefit of replacing the stock fuel pressure regulator

Reply #3 –
ok.  thanks.  I can divert that cash to something else then.
'88 Bird 5.0, TW 170s, HO cam, Scorpion rockers, Explorer intake 70mm TB/EGR, MAF conversion, 24# injectors, 8.8 3.73 disc rear end swap, console swap, leather seats, 11" front discs, 15-1 rack, TC springs all around, x-pipe, BBK headers,  welded sub-frame, unlocked digital speedo.

Benefit of replacing the stock fuel pressure regulator

Reply #4 –
If yours is good, I wouldn't mess with it.  My car developed a surge and I ended up replacing my stock FPR w/an adjustable BBK one.
'88 'bird, 10.9:1 306 w/TFS top end, forged rods/pistons, T-5 swap & bunch of other stuff, 1-family owned, had it since ‘98, 5.0tbrd88 on Instagram and YouTube

Benefit of replacing the stock fuel pressure regulator

Reply #5 –
Depends on your setup.  If you're running enough injector for your combo, an adjustable isn't necessary.  With the cam I run, If I run stock pressure, I'll get an adaptive fuel limit lean code with the 24's I have. I run them at 52 PSI and the code goes away as running more pressure will allow more flow through the injector.  The downside to this is of course it puts more restriction on your pump and will cause the PUMP to flow LESS.  I'm running a 255 pump so it's not an issue.  I REALLY have to put in the 30's and metering tube for them that I picked up...
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Benefit of replacing the stock fuel pressure regulator

Reply #6 –
With your combo and 24lb injectors the stock FPR is fine. I'm running a stock replacement Motorcraft FPR without issue.
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

Benefit of replacing the stock fuel pressure regulator

Reply #7 –
thanks all.  I'll stick with stock.
'88 Bird 5.0, TW 170s, HO cam, Scorpion rockers, Explorer intake 70mm TB/EGR, MAF conversion, 24# injectors, 8.8 3.73 disc rear end swap, console swap, leather seats, 11" front discs, 15-1 rack, TC springs all around, x-pipe, BBK headers,  welded sub-frame, unlocked digital speedo.
 

Benefit of replacing the stock fuel pressure regulator

Reply #8 –
I run 89 stock bottom end e7 heads explorer intake b303 70mm tb cai 76mm maf full exhaust with 19# lighting injectors bbk adj fuel press reg with a 255 walbro pump in the tank. I set the fuel pressure at 45 and on the dyno it was running lean turned up to 58 psi to get the air/fuel where the dyno tuner wanted it. its all in what ur car wants