I think the general rule of thumb is to have 100 buy ins in your bankroll to be comfortable to play.
$85 should be enough to turn into profit if you play your best, you have 85buy ins. HOWEVER, I feel like maybe you'd be more profitable maybe doing $1 turbo tourneys instead? More players but much bigger prize pool! However do what makes you happy!
TLDR: I think you'll be fine, but usually try keep it at 100buy ins on your bankroll
variance is much higher in turbo. for turbo 90m u need cca. 100-250 BI (depends on ROI)