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Originally Posted by Brian Carlton
I tend to think it is getting enough fuel to spin the turbo up to sufficient speed for more than 6 psi boost. Even if it was running lean, the turbo would acheive full boost, however, it might be a bit later in the rpm range.
OK, now that we know the wastegate is fully closed to start off, see if it is possible to disconnect the wastegate actuator so that it never opens the wastegate under any condition. I have not taken a good look at the 603 in this area, so, maybe Dave could chime in here on whether this is possible.
The goal is to eliminate the wastegate from the equation and now see if you have more than 6psi. Of course, you will have to be careful. If the boost climbs up over 12 psi during this test, then let off the pedal and keep it below 12 psi. If it remains at 6 psi, then we know the wastegate is out of the picture and need to look elsewhere for the problem.
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This morning, I clamped the hose off to the wastegate pod and nothing changed!
Kevinaw's point about the Alda not supplying fuel beyond 6 psi is possible I suppose but my thought is now, can the turbo produce 6 or the designed 12 psi at the proper rpm's wether or not the Alda is enrichening?
In other word's, is the Alda fuel enrichment totally necessary in order for the boost to develop at all? Of coarse if the Alda isn't enrichening, you wont have more power, but inspite of that, will the boost rise anyway without Alda fuel enrichment?
If the Alda is needed to produce boost, than I need to adjust the Alda.
If the Alda is not necessary to produce boost, then I may need to rebuild the turbo maybe?