I thought there may be a way to shortcut things too so I downloaded a few vortec bins I found one here. Most of them had mistakes, none where even close to what I have now. I do not know it all either, that's one thing I tried to do with mine is actually test things to see if the results were what I thought they should be. Some settings I ended up setting back to stock with no ill effects. Its surprising how little was changed with the 1996 tbi vans that had vortec heads. I borrowed a few things from that bin but not a lot. My fuel table shape ended up being very different than factory. The table after about 4400 is just pulled out and not developed as I never run it past that anyway. Check your pressure, the "18 psi" spring I got from ebay ended up being a lot higher without adjustment. I screwed the adjuster out and ended up with 19.5 lbs. I am pretty sure that spring can be had from Mcmaster carr for a lot less money than I paid. One thing others do not talk about is the plenum volume a carburetor manifold has over the tbi intake. I keep finding the GM TBI vortec manifolds used and cheap, as no one in this area wants to mess with TBI anymore. I think the smaller plenum volume is one reason I did not need near the AE increase that others talk about here. Replace your o2 with a new one before you start tuning, they are cheap. I got a new old stock AC delco for a few dollars on ebay. An old sensor with thousands of miles will not respond as well as a fresh sensor.
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