Fix cogging in your WL Toys 124017, 124016 or Eachine EAT14 for $27 (or as little as $12)
It was an anticlimax to say the least when WL Toys finally launched their first factory brushless cars. Due to the cheap ESC but moreso the tall gearing they were plagued with issues of cogging - the stuttering of the motor as it struggles to move from pole to pole at low speeds and the loss of torque as a result. You can see this issue in my review of the Eachine EAT14 which has the same problem. WL Toys solved this problem with a hasty update to V2 with a shorter gearing and a higher kv motor. Here is the new 124017 V2 and 124016 V2 (it's hard to find the V1 any more)
I've already written this article to show fixes based on parts available at the time but now I have a new fixed based on newly available parts from the V2 that should solve your problem for just $27 (or as cheap as $15 if you reuse your motor) . Read on and follow me as I "fix" my 124017
As per this article I have fixes for the cogging in the 124016, 124017 and Eachine EAT14 which have the shorter gearing that I prefer however they are not especially cheap fixes though remain my favourite in terms of performance.
If you want to keep the improvement cheap and quick though there are 2 new options for you:
QuadifyRC 124016 124017 EAT14 cogging issue fix
The WL Toys 124016 and 124017 (and the Eachine EAT14) have a major issue with cogging - the stuttering that occurs when accelerating from standstill or low speed and is a major downside to these recent releases. Cogging in your car is not by bad luck but by design choice; in the search for top speed bragging rights, the tall gearing has really compromised these cars ability to accelerate. Never fear, QuadifyRC to the rescue! I'll give you 3 and a bit options on how to fix this issue by addressing the root cause rather than by going on a wild goose chase and addressing the wrong things.
Cogging - The Root Cause
As soon as I found out WL Toys and Eachine had retained the big 27t pinion from the brushed models I knew they would be fast but were going to be poor on acceleration. This turned out to be correct as you can see on my Eachine EAT14 review which has the same running gear as the 124016 and 124017. You can get away with this big pinion on a brushed motor (like with the 144001, 124018 and 124019) because of the way they work but not on a brushless motor because of the way they differ mechanically. Cogging is when the electromagnetic field invoked by the motor is not strong enough for the motor rotate and catch the next pole thereby getting out of phase and rocking back and forth; it's that jiggle your car make before it takes off. So what causes it? The motor can not generate enough torque for the given load. The 2845 is not a small motor for a car this size so it is safe to assume that it is the load that is unreasonably high due the very tall (fast) gearing.
Since we know the root cause we need to address it directly in order to get the best quality solution but before I do that I'll let you know the things that will NOT fix it:
EACHINE EAT14 Review: Brushless 144001 out of the box with more improvements than you'd realise
The Eachine EAT14 is 1/14 scale brushless 4wd RC buggy. This car is made by WL Toys for Bangood under their Eachine Brand and is based on their hugely popular 144001 car but with a upgrade to brushless power and discrete electronics as well as a raft of other improvements. I will cover the spec, build quality and of course performance of this car as a stand alone review here rather than focusing to heavily on the obvious comparisons. This car is also practically identical to the WL toys 124016 and 124017 except for a slightly smaller wheel base so the findings here apply to those cars as well.
Just to be very clear, Eachine is not a manufacturer. They are a brand only which is exclusive to Banggood which they use for RC products. The brand managers at Banggood relabels products from their key suppliers, in this case, WL toys. Thus, so for all intents and purposes, the Eachine EAT14 is an RC Car designed and made by WL Toys.
A closer look at specs and build
Now that we have that out the way, let's take a closer look at the car, including the specifications and how it has been put together. This car is based on the WL toys 144001 which as mentioned before is a hugely successful car and a product I consider myself to be an expert on - I have written over 30 reviews and upgrade guides on this car which you can find here. The key difference of the Eachine EAT14 to that base model is the brushless power system but there are a raft of other obvious and not so obvious improvements which I'll cover in detail here.