I was thinking about adjusting the springs and it didn't look all that fun. Plus, if I wanted to change it, it would be the same hassle again. So I just got a manual boost controller (ball and srping) off of ebay for less than $20 to my door. I had to get some reducers and new line to make it fit onto the barbed ends of the MBC. That was less than five bucks. Cut the line, splice it all together, drive and adjust. It's that easy.

I was at about 8.5 PSI before. I'm running about 13 now according to my fuel pressure gauge newly adapted as a boost gauge duct taped to my windshield. My 0-60 dropped from about 20 seconds to about 16.5 seconds, give or take a couple tenths. I was hoping for it to hit 15 seconds, but I can deal. I thought it was good enough at 20 really.

I just really like the fact that I can just reach in there, loosen a nut, turn a dial, and boost is adjusted. I really don't think I'll be adjusting it too much, but it's nice to know it'll take 30 seconds if I want.

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1983 300SD