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Biomecanoid
09-05-2017, 10:42 PM
Hello,


Thanks to Tobey from Banggood i received my XLH 9120 some while ago.


You can find the car on banggood for about 52.99$ + 7.58$ shipping

Car Details:

Dimensions: 32*26.5*15CM
Battery: 9.6V 700MA Li-ion-Fe
Remote Distance: 100M
Maximum speed: 38KM/H
Run Time: 10mins
Weight: 1040G

Package includes:
1x RC Car
1x charger
1x Remote Control
1x screwdriver
1x battery


Here is a photo of the 9120 alongside my other rc cars for size comparison :


As you see the car is even smaller than the Feiyue FY03

When you 1st unbox the car you immediately realize 2 bad aspects of it


* The bad suspension that makes the car bounce around
* The very cheap bad wheels with no foam inside ( they also contribute to the bouncing effect since they lack foam to cushion the anomalies of the road )

My plan is to mod the car to almost hobby grade quality.
The fist move is to find a new or mod the existing servo to 3 pin so i can use a normal hobby grade receiver with the car.

In the above photos you may have noticed that the car is very wide, the reason for that is that i have 15mm axle wideners at the back and 25mm at the front.

Also as a cheap upgrade to the suspension i used the suspension from the Remo 1/16 truck which also made the car sit lower and closer to the ground.

Hopefully these 2 simple mods will make the car way more stable and less prone to roll over while turning.

If all goes according to plan my intention is to make with car FPV






https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10234736-255-thumb-IMG_8399__.jpg?d=1501252047

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10234737-113-thumb-IMG_8400_.jpg?d=1501252071

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10234738-128-thumb-IMG_8397.jpg?d=1501252102

Biomecanoid
09-05-2017, 10:43 PM
I think i solved the puzzle with the proprietary servo. The servo was a major problem when you wanted to upgrade to hobby grade ESC and receiver.

Well to convert the servo to standard 3pin i sacrificed the control board of a small tower pro SG90 servo. It was a bit of a hassle to match up the signal cables cause they don't color match but i was lucky.


Video is here :

https://youtu.be/X1UnPk8oeGI
.

Biomecanoid
09-05-2017, 10:44 PM
I installed it on the car and it seems to work OK

uploading video here:

https://youtu.be/-xqWAXV2uBQ

The steering needs trimming because its not straight but its just a test.

Biomecanoid
09-05-2017, 10:45 PM
The car is ready lets summarize the upgrades so far:

* Axle wideners
* Brushed ESC ( in the battery compartment )
* FlySky Receiver
* Coverted original steering to 3pin
* Motor Heatsink
* 2s lipo 2000 mah
* Remo shocks to lower the car and make it not bounce so much

Upgrades to come ( waiting for hardware )

* HBX wheels ( only have 1 pair now )
* Lights
* Oil shocks
* FPV
* Maybe a horn ( if i can figure out how to make one )


The only problem i had with the car is that it was very hard to line up the steering properly and it required "mechanical" trim if i can call it that from the car also needed trim and subtrim from the controller and also raised the limits of the steering channel to 120%.

I am happy with the upgrades so far and the car looks as "clean" as possible.

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10318238-59-thumb-IMG_8685.jpg?d=1504128149

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10318240-195-thumb-IMG_8686.jpg?d=1504128178

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10318242-86-thumb-IMG_8687.jpg?d=1504128207

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10318245-40-thumb-IMG_8688.jpg?d=1504128240

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10318248-251-thumb-IMG_8689.jpg?d=1504128285

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10318253-201-thumb-IMG_8690.jpg?d=1504128313

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10318258-228-thumb-IMG_8691.jpg?d=1504128347

Biomecanoid
09-05-2017, 10:48 PM
I think your are going to love this, corona servo with the original gear shaped servo horn.

The steering went from lame to awesome. This is the kind of servo i use of my Feiyue so if it work perfectly on that car on the 9120 its overkill

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10320902-140-thumb-IMG_8699.jpg?d=1504221971

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10320903-148-thumb-IMG_8700.jpg?d=1504221986

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10320904-133-thumb-IMG_8701.jpg?d=1504222004

Biomecanoid
09-05-2017, 10:50 PM
Update:

* Made Velcro straps, and modified the battery cover so i can fit the straps.
* The servo cover no longer fits, so i cut the front part of the cover because it was a structural part securing the front of the car to the chassis.
* Pour hot glue over my DIY mount to make it stronger.
* I also cut off the power switch of the ESC because when the car moving, sometime the switch would trigger cutting power to the car.
* Steering travel now is way to much had to tune it down to about 60%
* Also tuned the end points of forward to 110% and reverse to 70%
* Added some expo to the throttle channel to make acceleration smooth so i don't grind the gears

I believe that's it for now



https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10321417-154-thumb-IMG_8702.jpg?d=1504239495

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10321419-76-thumb-IMG_8703.jpg?d=1504239510

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https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10321422-40-thumb-IMG_8705.jpg?d=1504239546

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https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10321435-206-thumb-IMG_8710.jpg?d=1504239690

Biomecanoid
09-05-2017, 10:52 PM
Next mod completed lights:

* Led lights installed in the buckets on the roof
* No controller is needed
* Lights are connected to the esc plugs going to the motor and the light work only when you press the throttle and the intesity of the light vary depending on the amount of throttle.

This is a very easy little trick from the old days when there were no led controller and you only had a 2 channel radio anyways.

This car is not that fast and it does't roll over easily since its lowered and more wide now so, hopefully the wiring on the roof will stay in place.

Usually i take off the roof light buckets cause on faster better car there is no chance that the lights will stay in place but the 9120 hasn't much to show and it needs a little "bling" to impress lol



https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10321548-130-thumb-IMG_8711.jpg?d=1504246385

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10321549-179-thumb-IMG_8712.jpg?d=1504246400

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10321550-91-thumb-IMG_8713.jpg?d=1504246418

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10321551-206-thumb-IMG_8714.jpg?d=1504246434

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10321554-148-thumb-IMG_8715.jpg?d=1504246450

Biomecanoid
09-05-2017, 10:53 PM
Filter on the motor to keep dust and debris out

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10324010-253-thumb-IMG_8716.jpg?d=1504333532

Biomecanoid
09-05-2017, 10:54 PM
Here is a test run of the car with all the mods i have done so far:

https://youtu.be/_Am423eJSj8

Biomecanoid
09-05-2017, 10:55 PM
Front lights ( always on 5v powered from receiver )

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10329008-5-thumb-IMG_8718.jpg?d=1504505844

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10329009-27-thumb-IMG_8721.jpg?d=1504505868

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10329010-67-thumb-IMG_8722.jpg?d=1504505885

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10329011-241-thumb-IMG_8723.jpg?d=1504505906

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10329012-168-thumb-IMG_8724.jpg?d=1504505924

https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/t10329013-121-thumb-IMG_8725.jpg?d=1504505955

Biomecanoid
10-26-2017, 04:09 AM
Time for FPV:

The camera and Vtx combo are from akktek.com

http://www.akktek.com/products/micro-aio-cameras/akk-kc02.html

Here are some details:


7-20V FPV Transmitter

Video Format: NTSC/PAL, Output Impedance: 50 Ohm
Antenna connector: RP-SMA connector
Supply current: 280 mA, Operating Temperature: -10 +85℃
Video Band Width: 0-8.0 MHz, Audio carrier Frequency: 6.5 MHz
Video Input Level: 0.8,1.0,1.2 Vp-p, Video Input Impedance: 75 Ohm
Audio Input Level: 0.5,2.0 Vp-p, Audio Input Impedance: 10K Ohm
Operating Voltage: 7-20 V, VTX Size: 31mm*25mm*8mm

600TVL perfect picture quality camera

CCD: 1/3 Sony SUPER HAD II CCD
Pixel: NTSC: 768(H)494(V),TV System: NTSC
Resolution: 650TVL(b/w), 600tvl(color)
Synchronization : internal synchronize
Shutter Speed: (CCD IRIS) NTSC: 1/60~1/100000 sec
Noise: > 60 (AGC OFF), Video Out: 75ohm, synchronize
Min. Illumination: 0.01Lux, Auto Gain: Off/Low/Mid/High
Back Light Compensation (BLC): Off /Back light compensation/ Strong light suppression
Private shading (PRIVACY): 1~8 private shading area
Motion Detection (MD): On/ Off (Multi level sensitivity settable)
Auto White Balance: Manual / Auto / Auto track
Mirror: Horizontal Mirror optional
Negative: Positive / Negative optional
Color to B&W: Auto, DNR: 2DNR; WDR: D-WDR
Day / Night Shift: Auto/ Color/ B&W
Menu (OSD): English menu, White Dot Repair: Support
Image Adjustment: Support, Camera Title: Support
Power Requirement: DC5V~22V, Working Humidity: 20~80%
Storage Temperature: -40 ℃ ~ +60 ℃
Storage Humidity: 20~95%
Dimensions(mm): 25X25(W*L)
Power Consumption: 70mA




https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10334667-162-IMG_8735.jpg


https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10334681-77-IMG_8736.jpg


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https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10334675-24-IMG_8742.jpg

Biomecanoid
10-26-2017, 04:10 AM
Added a fan on the Vtx because it was running too hot to the point that the antenna was getting hot too, and also added a lipo low voltage beeper


https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10336729-202-IMG_8743.jpg


https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10336731-51-IMG_8744.jpg


https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10336735-231-IMG_8745.jpg

Biomecanoid
10-26-2017, 04:12 AM
Bigger bumper.


https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10348654-127-IMG_8774.jpg


https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10400508-181-2016_0718_160645_129.MOV_snapshot_00.16_%5B2017.10 .02_19.40.27%5D.jpg


https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10400509-250-2016_0718_160645_129.MOV_snapshot_00.28_%5B2017.10 .02_19.39.45%5D.jpg

Biomecanoid
10-26-2017, 04:16 AM
The new wheels and oil shocks arrived.

The oil shocks are 80mm in length which makes them shorter than the original 9120 shocks but longer than the Remo shocks. Also the springs are soft

I think the posture of the car is better now.


https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10417534-249-IMG_20171009_130347.jpg


https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10417538-33-IMG_20171009_130414.jpg


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https://static.rcgroups.net/forums/attachments/4/3/2/5/7/5/a10423445-252-IMG_20171011_145622.jpg

Biomecanoid
10-26-2017, 04:18 AM
9120 rc car maiden drive with all the mods:

- New ESC
- Corona Servo
- 2s Lipo
- Oil Shocks
- Bigger Wheels
- Axle Wideners
- Working lights
- FlySky Receiver
- FPV
- Big bumper

https://www.youtube.com/watch?v=_mtec7mD0EM


First impressions: Works very well but a bit slow, may upgrade to 3s

is that what the top speed of the car supposed to be ?

Biomecanoid
01-22-2018, 11:02 AM
Long forgotten unboxing video:


https://cdn3.iconfinder.com/data/icons/free-social-icons/67/youtube_circle_color-128.png

https://www.youtube.com/watch?v=EaiewfvltPE&t