I'm running unregulated LiPo in the 1/8 cars but I run the 7940s for steering on all my 1/10 cars at 6v and they work fantastic there as well. They are plenty fast either way. I hated the Hitec servos I'd tried years ago (10 or so) and was dead set against trying their high volt units but a few people kept recommending them. I'm glad I took their advice as they have been amazing. 7 servos, all 1-3 years old, all servo savers locked, and zero failures.