Xpress Mini-X 1:24 4WD RC Car – Vintage 2002
Editor : Patrick/ Ronny @ Jan 2002
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What is this? A 4WD 1:24th scale! However, I suppose that it is the first time for you to hear about the co-existence of these two words. 4WD is widely employed nowadays in 1:10th scale or any bigger scale model car. Without a doubt, 1:24th scale is the hottest topic in R/C field since the introduction of the Kyosho(r) Mini-Z(tm). Therefore, at this time, we will put our sight to focus on this new dominance The Mini-X(tm)!
Mini-X(tm) is designed and produced by Sun Sun Model(r) since the March 2001. Needless to say, they have their know-how in engineering by producing the ever-popular Xpress(tm) 1:10th scale since the last decade. In any open racing, it is not unusual to find racer using this brand name product. Their experience and expertise has been proven to be successful, so let’s go take a closer look to this hot new dish!
|Body Set Weight (100g)||with ESC & Rx (135g)||Total Weight (185g)|
Basically, Mini-X(tm) is categorized into the same class of mini car like the Mini-Z(tm). Obviously, you figured that out from its way cool name Mini-X(tm). However, it does not have a single part from our well-known Mini-Z(tm). If the mini car is a 1:24th scale class category. Then, Sun Sun Model(r) just upped the ante, the Mini-X(tm) is the new benchmark of the 1:24th scale car and it brings this class category to a new level of fun.
Build and Construction:
The Mini-X(tm) is not gas engine power and it will not fly with wings. However, there is no exaggeration that Mini-X(tm) is an innovated mini car with the concept in mind from their Xpress(tm) 1:10th scale model. For its appearance, it is generally the same as a normally 1:10th scale R/C car, but in a 1:24th scale – Plastic chassis, antenna tube and four slick/tread striptires. After removing the plastic chassis, you will find that it is really a great design. All parts are assembled with great care and detail. Four independent suspension arms, slick tires or tread strip tires. The motor is positioned in the center for good balance front and rear. Also, features a front and rear ball differential gear, camber adjustment, 4 AAA battery compartment, floating steering bar, strong mini-servo, power ESC and long distance RF 27MHz radio.
At this moment, can you imagine what the Mini-X(tm) looks like? Let’s have a quick look:
|Clamber Structure||Different Tire thread|
|Front wheel bearing loc||Mini-X||ESC|
The provided motor is a 70 (Turns) and comes with a long shaft to link the front and rear gear. The generic ball differential design is similar to all 1:10th scale up, but it is tiny! They are made of 8 (2mm diameter) steel differential balls sandwiched between 2 steel plates and 8 (1.5mm diameter) small pressure balls for the compensation of tightness balancing. Motor and gear (8 pitches) combination is simple and clear because it is direct drive motor to the gear of ball differential (select 34, 35 and 36 pitches) in both front and rear. Very simple and direct layout. Optional one-way ball differential will be available. 4 wheel Independent suspension system: Four points designed with rod bar compensation. The dog-bone transmission allows the free moment of each suspension unit. The degree of hardness of each unit can be adjusted by different combination of spring set. Just like the bigger cars! There are two sub-functions from the front of suspension system which are the degree of camber and 2 cluster modes exchange. A 2 cluster mode coarse tuning effects the response of the steering, allowing a wider steering angle. Believe it or not Mini-X(tm) can make 60cm circles.
All electronics are optionally included. The Radio Receiver is using the standard amplitude modulation at 27 MHz frequency band. There are two channels – steering servo and ESC. The receiving range is up at around 50 ft or 15m. The receiver is able to suppress the unexpected bad signal influence and result from the purpose of protection. The Mini-X(tm) can have a wide operating range from 4.8V to 7.2V and the maximum current is 10A. It is programmable to calibrate with different model of AM Radio system. The calibration procedures are full throttle, full brake and Neutral” and it is performed by the assistance of both LEDs indication and Single touch control. The size of battery should be any AAA type. Mini-X is capable to be powered by 4 batteries or 6 batteries. Currently there are two soft plastic chassis available. They are similar to Toyota supra and Toyota corolla. Therefore, racer can design your own patterns with different paint and provided sticker. Another great feature of Mini-X(tm) is most 1:24th scale model cars can fit with minor modifications. Let your imagination go wild!
|Front wheel cluster close look 1||Front wheel cluster close look 2|
|Front Wheel Parts Brake down|
The down side to the Mini-X(tm) is the top speed gives up a little for mid-range power and acceleration and all the mechanical parts may cause some additional vibration and become the electric equivalent to a power hog. All this means more power consumption and more maintenance for car. The unique front one-way ball differential can get expensive, 6 battery charger is not common for AAA size.
The Mini-X(tm) configuration allows smooth acceleration and great response going in and out of corners with the right amount of torque to all the wheels. What better way to get all that power to the ground than having an independent suspension and 4 wheel drive? And if it is not to your liking you can adjust the pressure screw to your style of driving and or change the springs. Same goes for the steering, it has adjustable camber angle. The Mini-X(tm) – Simple and direct, and it is important that the price is low, and AAA battery can be found from anywhere!
Review and Test Drive:
Basically, Mini-X is very different from any mini R/C cars available in the market. The independent suspension system replaces the popular H-plate design to assist the steering condition. Firmness can be achieved by adjusting the hardness of spring instead of hardness of H-plate offering a higher amount of variables in track conditions. The Independent suspension design helps the mini-X run in most surfaces with good performance. No ride height rings are necessary. The height of car body can be adjusted by simply adjusting the screw at the bottom piece of suspension arm. With the integration with front and rear ball differential system, maximum traction of 4WD becomes possible. The front suspension system is not only responsible for its basic function of independent suspension, but the degree of camber and cluster can be adjusted in a very neat way. These two sub-functions can combine to make a wider range of steering response. The center of gravity of the car set is relatively lower than any mini-cars. This can be obvious found from the placement of battery, motor, ESC and Receiver. The factory ESC is powerful enough to drive a wider range of motor without damage. The strong and reliable radio foundation allows Mini-X to be played in any areas.
In other words, Mini-X can run in a high speed in a wider condition.
|Front wheel shaft||Front Wheel Set Disassembly|
|Front wheel suspension||Independent Suspension function|
Mini-X is really the most innovated design to the 1:24 scale. No matter if you are a beginner in R/C car or a skilled racer, all can find the joy of playing this mini-X without any hassles. Although it is compact design, it consists of full features of 1:10 scale models. Beginner can get start with this R/C kit easily with a lower entry cost. Skilled racer can practice their skills with this portable mini-X at anywhere and anytime. Owing to the factors of its compact size and wide range of running surface, it becomes possible to run Mini-X at home.
|Adjusted clamber||Adjusting Differential pressure|
General setup and maintenance procedure:
– A suitable tire should be installed depending on the different surface condition in order to achieve the best traction.
– Bearing should be oiled from time to time.
– Shaft ring should be fitted to fill the gap over 0.5mm in order to achieve the best stability.
– Different strength of spring should be applied depending on different track condition such as angle of corner, number of corner and full speed portion.
– It would be the best to keep the center of gravity down in order to increase the stability in all condition.
– Motor should be cleaned with proper solvent
The inner space between the two front suspension arms on both sides must be increased. This can be done by the following procedures:
– Setup the front wheel with your expected camber angle.
– Mark the position ball head position for the camber purpose.
– Remove the pin.
– Unplug the top A-arm with the ball head.
– Choose a suitable file to rough the surface including hex ball head towards the dog bone.
The abrasion should be stopped if the front independent suspension can move freely through the whole course of the damping range.
|Larger Clamber angle||Long motor shaft n motor|
|Overview of 2 cluster mode||Rear part|
The ball differential must be setup properly with the following procedures, otherwise, it will result the problem of insufficient steering and slow response turning into a corner.
– Open the front and rear ball differential gear by unscrewing the screw inside.
– Face the front of the mini-x
– Unscrew the pin screws above the ball differential
– Put the ball differential out with the 8mm X 12 mm bearing
– Unscrew the screw on the inside the long tube
– Put grease onto each ball holes, low to medium viscous type are recommended.
– Reassemble it back by screwing in real slow
– Check the tightness from time to time
– Stop screw in when it JUST starts differential when gentle force applied on one side.
– Ball differential slippery is not a concern.
After having finished the front differential, adjust the rear with the similar procedure. However, it should stop screwing in only when it is slight more than JUST starting differential.
Furthermore, mini-x has also taken care to model car collection! It is flexible enough to turn all static models to live because Mini-X is a true 1:24 scale and it can be well fitted with different chassis at minimal modification in a lower price, but more options.
|Rear Suspension Side View||Rear Suspension|
|Rear wheel horizontal view||Rear wheel independent
– Different quality of ESC
– Bearing 3mm x 6mm and 8mm x 12mm
– Option tire with different thread and softness
– Option ball differential gear with different gear ratio
– Option wheel nut for 3mm wheel nut
– Hand wired motor shaft – DIY
– Car body with different axis length
– Different length of dog bone for different car body
– Option spring set with different strengths
– Different size of wheel
– Front one-way differential gear
– 29 MHz and 40MHz
Compatible parts from other manufacturers:
Tires: Slick and spongy tires by Kyosho or GPM
Radio Transmitter: All 27MHz AM transmitter such as EX-11, Futaba MEGA Tech, General Kyosho transmitter
|Side view cluster 1||Side view cluster 2||Suspension Spring|
Editor : Ronny @ Feb 2002
Calibrationg procedures for the Mini-X ESC
Here are the calibrationg procedures for the Mini-X ESC!!!
|1||Turn the throttle trim to the neutral/middle of its adjustable range.|
|2||Switch Tx and Rx on|
|3||Leave the Tx alone and press and hold the setup switch of the ESC for 2 to 3 secs until both red and green LED turn On.|
|4||Release the setup button|
|5||Set the Tx to moving forwards direction and hold the throttle until the RED|
|6||Set the Tx to moving backwards direction and hold the throttle until the GREEN LED Turn On|
Mini-X 電變的調較步驟 (Chinese Version)
Here are the calibrationg procedures for the Mini-X ESC!!!
|2||Switch Tx and Rx on|
|3||將開啟了的遙控發射器放在一旁，切記設勿關上電源。按動電變上的 “Setup” 按鈕約兩至三秒鐘， 直至紅燈以及綠燈均亮起。|
|4||放開 “Setup” 按鈕|