what i remembered was they would get it fuel tuned for one ride and then drop in elevation or temps would swing (revy was real bad for that)and they were tuning again, and this is even more pronoun the higher the boost they ran, midrange tuning took more than powerjet adjustment and took needle adjustment..then the next day came and temps or conditions would be different and it started again, a good a/f was just having it anywhere under 11s, rather than trying for a insanely high 13...living on the edge
with the etec, its a quick push of a button at low elevations and your spot on, then jump to 7000 feet push the fuel button down and good again... the etec computer helps with hummidy, barometric pressure, elevation, water temp, fuel temp, fuel pressure, a/f mix (uses 5 onboard sensors) to prevent engine from running outside of engine perrameters, it can and does change engine timing, to correct a/f mix to keep it in the sweet spot, thus preventing catastrofic damage
now saying all that, if the fuel programer is not set correctly and boost is added the stock fuel system can only protect to so much hp, the secondary turbo injectors still need to be set to correct a/f
reeds were a trial and error learning curve, few of us trying all sorts of combinations, what seamed to work well was doubbling up stock reeds while cutting lower half of one reed, another one that ran well but bottom end response was slightly worse was the boyseen turbo reeds, i ran the tdr turbo reeds and they ran well over 1000 miles even at higher boost
few things to mention, running the etec at 7lbs boost is more than most can handle, it really is a sweet boost and quick spool, pin weight was 25 grams for comparsion in primary, and with that boost a 25 percent cut of race gas should be used, and with this boost can be a very dependle ride with very few sleds working you, my 880bb runs 22.5 grams with a slightly less starting spring, as for the two in comparsion the 880 is very quick and quick to rev, as the turbo is not as quick but still very easy to learn to ride in the trees, but when their is a open shoot or deep powder day the eturbo produces the tq to turn the track another 10mph and does it quicker and holds it more consistent than the bb can, taking you to new heights