I agree completely that the only correct way to "tweak" a pump is to have a professional do it on a test bench. The problem is that this is not always cost effective to do and many shops simply won't do anything but set the pump to factory specs for liability reasons. In the case of my truck the local pump shop would only do the "factory spec" settings. So following some instructions from Banks Performance I opened the top of the pump and turned it up myself. When I had the pump done on the Jetta I used a different shop, got friendly with the tech, he agreed to do what I wanted, he redid the pump and the pop pressures on the injectors. Calling it fast wouldn't be right but it'll smoke a stock turbodiesel jetta of the same era. Regarding MB's and adjusting the ALDA and boost. I can't see how adjusting the boost to the upper limit of the factory spec either with a Dawes Device or just tweaking the factory wastegate will cause anything other than the engine to perform as it was intended. Tweaking the ALDA is a questionable yet proven method to improve driveability. Especially off-idle acceleration. I tried a 1/4turn ccw and it helped a bit then another 1/4turn ccw for a total of 1/2turn ccw and the driveability off-idle has gotten much better. I tend to believe that since my car was originally a Kalifornia car the fueling was set very conservatively for emissions reasons. Increasing it a little won't hurt anything. You gotta remember that while there is always the "right" way to do things, and a pump shop will be happy to tweak your pump and lighten your wallet by $500-$1000 for it, there is nothing wrong with a little "backyard engineering" on a old car thats only worth 2-3K. If tweaking the ALDA a 1/2turn gets you what you want then I don't have a problem with it. I do however think you should know what the possible consequenses of your actions might be and adjustments kept conservative and within or at least close to factory settings. RT

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84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K