3 cell full will get you 55.000 rpm so its exceeds you said limits . 4370 is not a 3 cell motor

ok is there a way to eliminate the stuttering on the sensorless motor or do I need to get a sensored motor?

Most of the times it will become less when lowering the timing in the ESC.

Welcome to the hobby!!
Just wanted to say, THANK YOU FOR ASKING THIS QUESTION!!! So many people jump into it and throw the biggest C and Mah battery at their car and wonder why they have a bomb waiting to explode! Looks like from the posts, you got a lot of amazing information. Some of which i even had to save! And i have been in this hobby going on 10+ years now! Haha

thank you, Confusedrcracer
but i have another question can you set the timing on the Surpass Hobby 4370Kv 45a Brushless combo because i cannot find anything on the subject online and im wondering if any of you guys have some information on it

how can a 3s 11.1-volt lipo put the engine above the rpm limit because if you times the 4370kv by 11.1 that's 48,507

11.1v is the NOMINAL voltage of a 3s LiPo. A fully charged battery will be 4.2v per cell, or 12.6v for a 3s battery.

so thats why its stuttering at full throttle and wont move under load

No, if it's not moving it's not even close to exceeding the RPM rating.

ok so whats going on then the track will spin then i put it down and it will quit