# Best upgrade EVER **URL:** \ **Category:** Upgrades\ **Created:** [September 19, 2017, 2:22am UTC](https://community.inventables.com/t/best-upgrade-ever/42282 "2017-09-19T02:22:28Z")\ **Posts on this page:** 1\ **Showing post:** 401
**Author:** ![JustinBusby](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/justinbusby/32/30906_2.png) [@JustinBusby](https://community.inventables.com/u/JustinBusby)\ **Post date:** [March 17, 2018, 11:50pm UTC](https://community.inventables.com/t/best-upgrade-ever/42282/401 "2018-03-17T23:50:42Z")
More voltage, not power. Based on my research, the relationship between voltage and torque is linear up to the max of the stepper. Double the voltage, double the torque at any given RPM. Stepper motors drop off in torque as their RPM increases. That’s why there is always a max RPM with useful torque of a stepper that can be calculated based on the stepper parameters. Variations between spec sheet and real world can also be expected as well. I did quite a bit of testing with feed rates and acceleration values: > [@Z Axis Acceleration Tuning](https://community.inventables.com/t/z-axis-acceleration-tuning/43051/13): > > I did more testing on this today since my new motors came in. The results I got were surprising, to say the least. All acceleration testing was done using 2000 mm/min jog speed (limited by the GRBL max rate value) Inventables stock stepper motor: 10,000 mm/sec^2 was the only value that I could ever produce stalling. 269 oz-in StepperOnline: 1100 mm/sec^2 270 oz-in Automation Technologies: 3000 mm/sec^2 I ended up upping my value to 1000, I think, and I’ll watch it. I did a day of carving at… Again, not saying that the 269 oz-in won’t work as it does work (that’s what Phil uses). It’s just not an ideal match (but an ideal match doesn’t really exist either) and for not much more per motor, a better match can be found. Are you ever going to notice the difference on the Xcarve? Most likely not. You’ll run into other mechanical limits before the steppers become the problem. --- _[View the full topic](https://community.inventables.com/t/best-upgrade-ever/42282)._