The WL Toys 124019 is a 1/12 scale RC Car released late 2020 by WL toys and is largely identical to the hugely popular WL Toys 144001. Although the 124019 did however have some notable improvements as covered in my review, a bit of simple setup and tuning can improve this much more. In this guide I will cover how to best setup and tune your 124019 to get the best out of it without spending anything on upgrades other than consumable items like grease.
I've already written over a dozen guides on improving the 144001 here which are applicable to this car as well but I wanted to use this guide to be very specific on the exact improvements I made since the manufacturer has fixed some of the issues mentioned in my 144001 guides here and here.
Reduce rear toe in to a more neutral setting (free)
The 124019 comes from the factory with a lot of rear toe in. This helps stability through cornering (by adding a little understeer) but the effect is small and the counter to this is that straight line speed suffers as a result. The good news is that the rear to in can be easily set to a more neutral setting as below. I strongly recommend doing this because the extended wheelbase of the car is better at improving cornering stability anyway:
Adjust front toe and camber in to a more neutral setting (free)
Front toe (the angle the wheels point in or out) is poorly adjusted from the factory, just look at the picture below of my car fresh out of the box. However, since this car uses adjustable tie rods it is an easy fix. Adjustable tie rods mean the plastic cups that ultimately bolt to the car have opposite threads - one regular one reverse so that if you twist the shaft with both cup straight the both loosen (get longer) or tighten (get shorter at the same time), the idea being you can lengthen or shorten without moving the cups from the ball joints. Good in theory but poor in execution here - cups are threaded so tightly they pop off the ball mount on the car when you try to rotate the shaft. Regardless here we go...
Camber is adjustable front and rear using the uppermost tierods front and rear left and right. I like a tiny bit of negative camber on the rear (wheels leaning in at top) and none on the front because the caster acts as dynamic camber. These can be adjusted in the same manner as the steering links mentioned above but based on the fixed mount to the shock tower rather than the steering rack.
Grease the diffs for better traction (free if you have grease about otherwise about $5)
As mentioned in the review I was VERY pleased to see that the diffs have been shimmed in the 124019 (and have now confirmed in the 124018). This means the internal gears have much better meshing and will reduce wear and ultimately failure. Thus greasing diffs is no longer quite as important but still worth doing... not so much for the longevity of the diffs but for traction and performance - a freewheeling diff like this one packed with thick grease will stop stop one wheel spinning so wildly on low traction surfaces thereby increasing grip. Follow the steps below to see how:
Once the screws have been retightened, check the diff can be spun with your hand as above, If not, it may not have gone back together correctly.
Now, follow these steps in reverse to put the diffs back in their correct orientation, reattach the diff housings, reconnect the steering drag link and reinstall the top plate. It's not a terrible idea getting spare diffs which you can prepare ahead of time. These can be found here:
Correct the shock oil level - mine didn't need doing.
The shock fluid level in my 124019 was perfect - a welcome relief after the dangerously overfilled shocks in my 144001 that I remedied in this guide. As you can see from the pictures below I could achieve full compression and not the slightest hint of hydrolock or air bubbles. Well done WL Toys!
One thing you can improve from a battery perspective however is making sure the batteries stay good and there are 3 basic rules for all lipo batteries:
I think that'll about do it for this guide, there is plenty here to keep you busy for now. In return for this work you will get a car that handles better and is more robust against wear and damage. Perhaps more importantly though it will give you a better understanding and knowledge of you car... knowing where to look and how to problem solve if something goes wrong. Good luck and have fun! Coming soon are some new brushless upgrade options but for my current favourite, click here. Please note this guide is relevant to but the 124019 and 124018 cars as below:
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