RHP or lefty? My son is at a mid-major D1.....there are plenty of guys throwing 85-86 on the teams he's played against over the past two years. 90+ will get you noticed by some bigger schools....especially if you're a lefty. Keep in mind velo isn't the only thing.....college umpires seem to be tighter with their strike zone than HS, so being able to control the velo is probably just as (if not more) important than just throwing hard. If you're at 83-84 as an 8th grader and have reasonable control....I'd say you've got a pretty good shot....that's easily the upper end of what 8th graders are throwing velocity wise.