26-11-2012, 11:03 PM
Quote: The last thing you can do to modify your LDA at this point is adjust the pre-load. If you remove the large spring, which sits under the diaphragm you will be able to get to the star wheel, which it seats on. If you look you will be able to see the star wheel is on a threaded section, meaning it can be adjusted to sit higher or lower and therefore make the spring higher/lower and apply more pressure to the underside of the diaphragm. This means that the diaphragm can be made easier or harder to push down with more/less boost. If you have hard fingers you may be able to turn the star wheel with your fingers and thumb, if not you may need to use a flat head screwdriver to rotate it. Adjusting this involves a large amount of trial an error, but what you are essentially trying to do is make the LDA pin harder to push down, so that extra fuel is not injected until full boost is achieved. If this spring is too soft the LDA pin will be pushed all the way down (and therefore full fuel injected) at far to lower boost pressure.
Would you be turning this spring clockwise then mate to make it harder to push on? Thanks.