vacuun/fuel pressure
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
Lower vacuum with big cams at idle is normal. Fuel pressure should increase as vacuum decreases. When you apply throttle I asssume your vacuum is increasing and therefore lowering fuel pressure.
Le Mans Master
Joined: Feb 2005
Posts: 6,485
Likes: 566
From: Clearwater Florida
........ I disconnected and plugged the vacuum line to the adjustable fuel pressure regulator ... Air Fuel Ratio fluctuation was solved with no other noticeable affect ............
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
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Verdad Gallardo
Pro
Joined: May 2002
Posts: 678
Likes: 2
From: Lengede
I also disconnected the vacuum line to the adjustable fuel pressure regulator. Everything works fine, no problems what so ever...
Le Mans Master
Joined: Feb 2005
Posts: 5,146
Likes: 3
From: The Motor City
As vacuum is increased the fuel pressure will be lower (de-cell), when nearing zero vacuum/high load and at WOT, pressure increases. If you remove the vacuum line, pressure will remain the same across the board. When doing this, and the car actually under load (driving conditions), you will probably need to do some tuning. De-cell should become richer and possible not enough fuel at wot.
Last edited by mseven; Apr 19, 2011 at 07:18 AM.
