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Old 05-08-2012, 07:49 PM
Posted in reply to sweetk30's post starting "best mod is 2 fold #1 = 25 bucks..."
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89k5350
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thank you k30 thats exactly what i was asking for i just couldnt explain it but i do have a question for you have you done any of these if so what were the outcomes?
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Old 05-08-2012, 07:57 PM
Posted in reply to 89k5350's post starting "thank you k30 thats exactly what i was..."
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search my screen name and tbi you can read the stuff i have done but cant see pics unless paid member as there hosted here.
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Old 05-09-2012, 09:06 AM
Posted in reply to sweetk30's post starting "search my screen name and tbi you can..."
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what would this do for me http://www.jegs.com/i/JET-Performanc...oductId=748464 would i need to make any other changes for it?
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Old 05-09-2012, 09:16 AM
Posted in reply to sweetk30's post starting "search my screen name and tbi you can..."
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also will this work? http://www.autozone.com/autozone/par...fier=59521_0_0_
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Old 05-09-2012, 12:53 PM
Posted in reply to 89k5350's post starting "also will this work?..."
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Quote:
Originally Posted by 89k5350 View Post
That's the one I've used, as far as the jet adjustable fuel regulator, there are cheaper ones available that forge exact same thing, save yourself $30 or $40 and buy the cheaper ones. Remember that to adjust your fuel pressure, your going to need to install a guage at the throttle body to check it.
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Old 05-09-2012, 01:21 PM
Posted in reply to smier's post starting "That's the one I've used, as far as the..."
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89k5350
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so im asuming that i adjust it as high as i can? do in need to make any other changes to put the regulator on?
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Old 05-09-2012, 01:28 PM
Posted in reply to 89k5350's post starting "so im asuming that i adjust it as high..."
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Most guys that have bumped the fuel pressure up have set it to around 13 psi, I think ryokan was running his at 13.5 psi if I remember correctly. The stock pump is only capable of 15 psi if I remember correctly.
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Old 05-09-2012, 01:37 PM
Posted in reply to smier's post starting "Most guys that have bumped the fuel..."
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ok cool so ive got it mostly planned out tb rebuild kit, pod spacer, powercharger(salad bowl), fuel filter, shorty headers, headted o2 sensor, edlebrok intake manifold fuel pressure regulator any opinions? or ideas?
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Old 05-09-2012, 03:12 PM
Posted in reply to 89k5350's post starting "ok cool so ive got it mostly planned..."
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I don't think I'd spend time/money on the adjustable FPR.

Outside of when you get into serious modifications, without getting into PROM tuning you are potentially wasting gas and hurting performance by bumping pressure up without really getting into what your motor is doing when you increase fuel pressure. This is why they make things like wide band O2 sensors and people tune PROM's themselves.

Obviously, like bumping up the timing a couple of degrees, GM has some "fudge factory" built in to the system, however the ECM doesn't compensate for fueling under wide open throttle nor vehicle warmup via feedback from the O2 sensor. It "knows" fuel flow at WOT based on stock fuel pressure and the injector rating. Change either one without "telling" the ECM, and it will flow more or less fuel than it thinks it is. Obviously very bad if flowing less fuel (lean) and simply wasteful and potentially harmful to performance if too much (rich).

Unless the engine is starving for fuel at WOT (which is possible with modifications of course, or a variety of other reasons), adjustable pressure regulator should offer no improvement over stock.

You'd be better off with the "hard" mods that affect airflow, like intake or exhaust work. Realize that even with those, the system will likely run ok, but not be running as good as it can be. Case in point: 454 TBI. Headers, mild cam, and Edelbrock intake required a 16% increase in the volumetric efficiency tables due to just those mods, and that was simply to get it back in line for part throttle. It seemed to run fine, but when you get into it, it wasn't.
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Old 05-09-2012, 04:00 PM
Posted in reply to dyeager535's post starting "I don't think I'd spend time/money on..."
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The problem is many of the factory fuel pressure regulators aren't delivering enough fuel psi, it's not about bumping it above what gm intended, so much as making sure its getting enough. Some guys have checked theirs and found they were only getting around 9 psi stock...
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