Do I need an adjustable fuel pressure regulator? March 11, 2010, 01:13:59 AM So my AOD is getting rebuilt in two weeks and I'll be driving the T-bird on a regular basis again soon. Soon after the trans is done I'm going to be swapping in a set of 24lb injectors and a 73mm C&L MAF for the 24s. I'm just wondering if I should also install an adjustable fuel pressure regulator at the same time. The stock one still holds 39 psi. I don't think I'll need it but I just want a second opinion. Quote Selected
Do I need an adjustable fuel pressure regulator? Reply #1 – March 11, 2010, 07:51:16 AM I say if the old one is fine, dont mess with it. Quote Selected
Do I need an adjustable fuel pressure regulator? Reply #2 – March 11, 2010, 10:06:15 AM I'll just leave it alone then. I figure if the old one is fine there is no sense in replacing it. Plus the Motorcraft ones seem to last longer than the aftermarket adjustable ones. Quote Selected
Do I need an adjustable fuel pressure regulator? Reply #3 – March 11, 2010, 06:05:43 PM An adjustable pressure reg is nice(had one for years now,kirbin)and if you've already got the rail off for the price i say put it in.It is an easy way to raise or lower the lb of injector you have(to a point)to match your combo.Need a little more fuel(25,26,27lb injector)turn the pressure up,need a little less injector,turn it down,it's that simple.I say put on in you won't regret it. Quote Selected
Do I need an adjustable fuel pressure regulator? Reply #4 – March 11, 2010, 06:15:11 PM If you adjust the fuel pressure out of spec you will end up with a lean or rich condition at one end. Everything in the EEC works on a list of tables and it expects things to be in a certain range. Quote Selected
Do I need an adjustable fuel pressure regulator? Reply #5 – March 11, 2010, 07:21:27 PM You only need one if it runs lean at WOT, otherwise the EEC is going to adj the injector pulse by reading the A/F ratio as indicated by the O2 sensors... You can dial in a extra pound or two but, the EEC will lean the mixture back to stoich of 14:7... Still it should be richer at WOT with the extra fuel... I have an adjustable regulator but have never seen any long term gain, again due to the EEC following the O2 sensors and resetting injector delivery... Quote Selected
Do I need an adjustable fuel pressure regulator? Reply #6 – March 11, 2010, 08:25:31 PM I swapped the injectors today and left the stock regulator on there. I'm waiting on a C&L MAF to come early next week so I can actually drive the car.Did you know that you can get a car with a stock MAF to start and idle with 24s? It runs like ass and sounds like a pro stock car because it's incredibly rich but it will run. The only reason I started it was to check for leaks (I had re-connected the battery so I could prime the the fuel system before I re-installed the upper to check for leaks and then started it after I re connected everything). It idled well enough, even though it was pig rich, that I thought about running a cylinder balance test. I then decided that 2 minutes of run time to check for leaks was enough and I'll wait till the proper MAF gets here next week to run a KOER and cylinder balance test:hick: Quote Selected
Do I need an adjustable fuel pressure regulator? Reply #7 – March 11, 2010, 08:47:34 PM Quote from: thunderjet302;313753I swapped the injectors today and left the stock regulator on there. I'm waiting on a C&L MAF to come early next week so I can actually drive the car.Did you know that you can get a car with a stock MAF to start and idle with 24s? It runs like ass and sounds like a pro stock car because it's incredibly rich but it will run. The only reason I started it was to check for leaks (I had re-connected the battery so I could prime the the fuel system before I re-installed the upper to check for leaks and then started it after I re connected everything). It idled well enough, even though it was pig rich, that I thought about running a cylinder balance test. I then decided that 2 minutes of run time to check for leaks was enough and I'll wait till the proper MAF gets here next week to run a KOER and cylinder balance test:hick:Probably not a great idea. Check your oil level & for fuel in the crankcase if it was running pig rich. Fuel isnt a good lubricant. Quote Selected
Do I need an adjustable fuel pressure regulator? Reply #8 – March 11, 2010, 08:56:21 PM Quote from: jandmmustangs;313758Probably not a great idea. Check your oil level & for fuel in the crankcase if it was running pig rich. Fuel isnt a good lubricant.It's fine I checked it. It only ran for about 2 minutes. After about 30 seconds the thing actually learned to idle:hick: Don't worry I'm not running it again till I get the proper MAF next week. Quote Selected
Do I need an adjustable fuel pressure regulator? Reply #9 – March 16, 2010, 10:55:02 PM So it works fine with the C&L MAF and the stock regulator. I ran KOER codes and got a 44 and 94 (for the missing Thermactor system) and got a 9 for the cylinder balance test. I drove it and it runs and idles great. Oh and I figured out why it was idling like a pro stocker the first time I started it. I had a busted vac line to the brake booster and that was causing my py idle. I fixed it, after I installed the C&L MAF and couldn't figure out why it idled like still:hick:. Quote Selected
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Topic: Do I need an adjustable fuel pressure regulator? (Read 885 times)
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