[Jeff Higgins]

I had an interesting conversation with a buddy and very well respected local race car wrench over dinner and beers last night. We were talking about my (finally running) 3.0 liter MFI motor, and my efforts at dyno tuning it. Essentially, it runs too rich between 3,000 and 4,000 rpm, with the high and low speed mixtures spot on (all dyno verified).

I think I need a different space cam. He tells me there are actually adjustments inside of the aft cover, the one that goes over the space cam and clamshells, that may correct this for me without having to change the space cam. Apparently the one outside low speed adjustment and the high speed one under the cap screw are the the ones Bosch trust duffers like us to make; they hide the other ones inside where only the experts can find and utilize them.

So, the question of the day is this: have any of you fooled around with these adjustments? Any sage advice (other than "don't")? I have two extra pumps just sitting around, one functional and one siezed. I'm going to take one apart and see what is in there before I risk the one running on the car. Does anyone know which adjustments do what?