Do It Yourself AFPR
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Advanced
Joined: Dec 2004
Posts: 82
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From: Kalamazoo MI
Do It Yourself AFPR
On the 3rd gen site there is a tech tip for a do it yourself adjustable fuel pressure regulator. Basically you remove the cap, weld a 1/4" nut on it and put a 1/4" bolt in the nut, install a ball bearing on the diaphram, and put it back together. Has anyone tried it?
Burning Brakes
Joined: Jan 2006
Posts: 847
Likes: 0
From: Colorado Springs CO
On the 3rd gen site there is a tech tip for a do it yourself adjustable fuel pressure regulator. Basically you remove the cap, weld a 1/4" nut on it and put a 1/4" bolt in the nut, install a ball bearing on the diaphram, and put it back together. Has anyone tried it?
Le Mans Master
Joined: Feb 2006
Posts: 8,753
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From: Louisiana
Le Mans Master
Joined: Feb 1999
Posts: 9,926
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
injectos at whatever pressure you need all the time, instead of relying on the regulator to get it where you need it.
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Advanced
Joined: Dec 2004
Posts: 82
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From: Kalamazoo MI
From what I can see in the advertisments in the magazines, it looks like all that comes with the kit is the cap, new bolts, and plenum gaskets. Seems like a lot of money for so little product.
Melting Slicks
Joined: Mar 2001
Posts: 2,150
Likes: 304
From: Timra, Sweden
injectos at whatever pressure you need all the time, instead of relying on the regulator to get it where you need it.
With this mod you raise fuel pressure at idle and low throttle. During WOT it is the same as before. The ECM will detect a rich condition and try to lean down the engine when you cruise. During WOT it will run lean - BAD.
The fuel pressure regulator is a REGULATOR to keep the differential pressure over the injector constant. With a constant differential pressure over the injector each mS of fuel spray will deliver the same amount of fuel. If the differential pressure varies then the ECM has no control over fuel metering.
The vaccum hose is there for a reson
To raise fuel pressure you should increase the preload of the spring in the regualtor. By welding a nut to the cap and have a bolt that move the spring retainer you can adjust the spring preload. Aftermarket AFPR are just that, a new cap with a nut and a bolt to move the spring retainer.
Last edited by JoBy; Jan 16, 2007 at 06:51 AM.
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Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
So basically by removing the vacuum this guy just set the pressure at WOT pressure, which is high. Interesting. Why do we need the regulation of the regulator on our engines. Why not just have the
injectos at whatever pressure you need all the time, instead of relying on the regulator to get it where you need it.
injectos at whatever pressure you need all the time, instead of relying on the regulator to get it where you need it.
