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Mugen MBX8

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Old 05-31-2019, 05:05 PM   -   Wikipost
R/C Tech ForumsThread Wiki: Mugen MBX8
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Last edit by: E1 Diablo
E2025 - MBX8 Worlds Edition - April, 2019

MUGE0240: Wide Offset Wheel Hubs 1mm 2pcs; The 1mm wide offset wheel hubs will increase stability and cornering.
MUGE2146: Inline Front Uprights; The E2146 inline front uprights have smoother steering compared to the stock E2147 trailing front uprights and work great in high traction conditions. E2146 uprights can be used with both CVA and universal style driveshafts.
MUGE2168: -3mm Front Upright Arm; The -3mm front upright arm improves the initial steering response and make the vehicle more stable through the middle and exit of the corner.. The new upright arms also reduce bump steer and make the vehicle more predictable in bumpy conditions.
MUGE2235: 46T Spur Gear; The 46 tooth HTD spur gear provides a great balance of acceleration and top-end speed.
MUGE2252: 12T Pinion Gear
MUGE2254: 42T Conical Gear; The optional 12T bevel gear when used with the 42T conical gear will change the final drive ratio and increase acceleration.
MUGE2260: Center Joint Cup.
MUGE2261: Center Front Dog Bone (84.5mm)
MUGE2262: Center Rear Dog Bone (115mm); The front and rear-center dogbones for the MBX8 reduce friction from the stock universal driveshafts. Less friction will give the vehicle a more efficient drivetrain, increase acceleration, and provide more traction. The dog bones are lightweight, durable, and will increase traction.
MUGE2428: Rear Wing Stay +15mm; The +15mm wing mount has more adjustment and will help increase mid corner rotation and be more stable in high speed conditions.


E2021 - MBX8 1/8 Nitro Buggy Kit

Chassis:
The MBX8 chassis features a new design that improves traction and stability in bumpy conditions and on the exit of corners. The steering post are also keyed into the MBX8 chassis for easier maintenance.

Differential & drive train:
High Traction Differentials are included in the MBX8. The Mugen Seiki HTD provides increased acceleration, longer runtime, and more consistent handling. The HTD's also increase stability, traction, and improve handling in bumpy conditions. The HTD has a new larger volume diff cup to increase consistency during long main events. This makes it easier to time rhythm sections, better in bumpy and low grip conditions, helps to increase traction, and increases fuel mileage.

The new gearbox makes allows you to remove and service the differentials without detaching the suspension arm mounts. Easy access to the front and rear differential.

New straight cut 13T bevel gear & 44T conical gear. The new straight cut bevel and conical gears increase acceleration, runtime, and efficiency. A free and efficient drive train will also increase speeds while cornering.

Light weight one-piece wing mount:
The new lightweight one-piece wing mount lower the center of gravity. The position of the wing and wing mount is optimized to improve the performance of vehicle. The height of the wing mount is adjustable. This allows you to control the down force on the rear of the vehicle by simply raising or lowering the mount on the shock tower.

Light weight high down-force wing:
The new IFMAR legal wing is lightweight and provides amazing down force and cornering. The underside of the wing uses a new design to reduced weight and creates additional down-force.

Suspension:
New suspension mounts. The FF/FR/RF/RR are new for the MBX8.
The front and rear lower arms use a new impact resistant material for increased durability. The new arms are box-shaped and include arm stiffeners to reduce flex and increase durability. Adjusting the hardness of the lower suspension arms is now possible. This allows you to fine tune the steering and traction from track to track. CFRP plates will be released as an option part.

Center differential mount & plate:
The center differential mounts use a stiffer material and has a new top plate to reduce chassis flex and increases clutch bell, spur gear, and clutch bearing life. The reduced chassis flex also provides more consistent handling in all conditions. The top plate design also makes it easier to adjust the brakes and easier maintenance.

Enclosed Battery box and updated carbon fiber radio plate:
The MBX8 still uses a flat 2S Lipo or Life battery, but the receiver battery is now enclosed in a molded battery box. The battery box allows for quick and easy access to the battery. The molded box also helps protect the battery from hard impacts. The battery box is mounted to an updated carbon fiber radio plate.

Other new parts and upgrades:
Body, Clamping Servo Saver Nut, F/R Shock Towers, Front bumper, Front center and rear center universal joint.

Mugen Seiki MBX8 Manual

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Old 06-13-2019, 01:13 PM
  #961  
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Originally Posted by Big Will
If you were to build a new kit would you do this as you were building it, now?
While I was working on my car I suddenly remembered that I build the center diff with the included Mugen grease. And the grease was very dry when taking the diff apart. I build the front and rear diff with Mobil 1 synthetic grease which is what I usually do. But because it started building without my Mobile 1 grease nearby, I thought the Mugen grease would be fine.
I'm not sure if the Mugen grease is bad, but I have a feeling that doesn't like a lot of pressure and dries out quickly.

I got a tip from a pro driver that they had the same problem as me. He recommended me this grease: AM-210212 Molyfu Ep2 Grease
I did some research about moly grease and it's perfect for metal to metal connections that are under high pressure. And I think I AE Black grease is more or less the same kind of grease. I rebuild one of my diff with black grease on the outdrives and it's still super smooth when I apply pressure on the outdrives. I'll see how long it lasts like that, but I guess this stuff will perfect for building the diffs.
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Old 06-21-2019, 02:05 AM
  #962  
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For those that don't have enough steering on the buggy, Mugen releases these optional C plates:
E2169 ? Alum Rear Arm Mount F (+2): X8/E, X8T/E - Mugen Seiki Racing
E2170 ? Alum Rear Arm Mount F (+4): X8/E, X8T/E - Mugen Seiki Racing

I guess they will used on the truggy and maybe on buggy when the traction is very high.
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Old 06-21-2019, 03:06 AM
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It's not really about "more steering" its the same theory as Ongaro's setup and how JQ is setting up his car. youll find on high traction it will help with how the car rotates as it will make it smoother, however on low grip it not allow the car to transfer and force the rear wheels together to create grip(bad explanation but for my brain to understand). on extremely fast very bumpy tracks these should work as the car shouldnt grab the ruts.
I have purchased both and am going to test other suspension tuning to see if its possible to use these parts but still generate grip for a intermediate racer. i feel using more caster and more front droop with a one step lighter rear spring.

Only my thoughts on it from running a prototype i got made when i first saw them, we're also running a modified split centre diff (custom cnc bottom halfs with tops modified with a cnc machine to make it all slot together.
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Old 06-22-2019, 10:41 AM
  #964  
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Originally Posted by iplaygames
It's not really about "more steering" its the same theory as Ongaro's setup and how JQ is setting up his car. youll find on high traction it will help with how the car rotates as it will make it smoother, however on low grip it not allow the car to transfer and force the rear wheels together to create grip(bad explanation but for my brain to understand). on extremely fast very bumpy tracks these should work as the car shouldnt grab the ruts.
I have purchased both and am going to test other suspension tuning to see if its possible to use these parts but still generate grip for a intermediate racer. i feel using more caster and more front droop with a one step lighter rear spring.

Only my thoughts on it from running a prototype i got made when i first saw them, we're also running a modified split centre diff (custom cnc bottom halfs with tops modified with a cnc machine to make it all slot together.
Let me know how they work out for you. I tried 2.5° rear toe after the race and it was hard to drive. But my tires were also worn and the dust came up. I went back to 2.75° and it felt better. I wonder how it will feel with the optional blocks.
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Old 07-03-2019, 11:30 PM
  #965  
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Hi, does anybody run or have tested extended/offset:ed shock mounts / shock bushings? what did you found out? any difference in handlings?

Example https://raceimbue.com/index.php?main...roducts_id=255
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Old 07-03-2019, 11:57 PM
  #966  
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Originally Posted by F1nggy
Hi, does anybody run or have tested extended/offset:ed shock mounts / shock bushings? what did you found out? any difference in handlings?

Example https://raceimbue.com/index.php?main...roducts_id=255
No, but there is a video on youtube where Robery Battle talks about setup and he says it's similar as to having anti squat. It gives the car more traction on-power and supports the rear end a little more during mid corner.
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Old 07-05-2019, 12:42 AM
  #967  
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How much do your nitro cars weight ready to race (battery installed, full fuel tank, body installed) but without tires on the car?
I would like to know how much heavier my mbx8eco is than the average nitro car.
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Old 07-08-2019, 05:36 AM
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I've been hearing that the rear of the car is hard to dial in. That it seems to loose. Anyone having this issue? If you did what helped?
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Old 07-08-2019, 07:24 AM
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Originally Posted by Big Will
I've been hearing that the rear of the car is hard to dial in. That it seems to loose. Anyone having this issue? If you did what helped?
I had an issue in the beginning when I had the car, but that's solved and now it's super awesome to drive. The car has a lot of steering, but the rear end is stable on exit.
I was even looking for more on-power steering at the race yesterday.

The problem I had in the beginning was that the diffs would lock up. I used the Mugen grease on the outdrives and it dried out quickly. After rebuilding the diffs with moly grease (or AE black grease), they are super smooth. Also put the 2 big shims on the outside as per Adam Drake youtube video.
The center universals also put more pressure on the center diff outdrives than the dog bones and when you don't maintain the center diff very well, it can lock up. If you get the center dog bones, it's less of an issue and power will bled to the front easier.
If you still need to purchase the car, get the worlds edition. It has all the upgrades you need. Otherwise build you diffs as per Adam's video and use a difference grease for the outdrives.

I started a race yesterday morning with 5-7-3 in the diffs (Drake base setup) with the ackerman in the 4th hole. The car could use a little faster steering reponse and it understeered on power. I went to the middle hole on the ackerman plate and change my front diff to 8k and the car was almost perfect. I didn't wanted to change else because I was afraid to make it worse and the quali's had started. I qualified as 6th and ended up as 5th in the A main.
I been 2 months since I started driving again after a 5 year break from RC, so I'm still a bit rusty :-) And maybe my building skills were also a bit rusty which is why I had a difficult car the first times it tried it out. But now that the car is broken in and I have found out the right way to build and maintain the diffs, I'm really happy with the car's performance and the rear is really locked in to be honest.
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Old 07-08-2019, 08:53 AM
  #970  
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Whats the "base setup" most of you are using? I'm starting my build
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Old 07-08-2019, 10:15 AM
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I'm currently using Drakes low grip setup as a base to adjust off of.
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Old 07-08-2019, 11:58 AM
  #972  
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Originally Posted by Big Will
Whats the "base setup" most of you are using? I'm starting my build
Attached is my base setup for clay. It can be a little twitchy (off power) on some tracks, but then move the ackerman position back by 1 hole.
Attached Files
File Type: pdf
Base setup clay.pdf (511.0 KB, 221 views)
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Old 07-08-2019, 12:37 PM
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That is literally Adam Drakes low grip setup
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Old 07-08-2019, 12:57 PM
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Originally Posted by TheGuyOfNoName
That is literally Adam Drakes low grip setup
His setup has less toe, higher front ride height, shorter wheelbase and a 2.5mm rear swaybar.
So it's close, but not literally the same.
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Old 07-08-2019, 01:02 PM
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Ahh ok, went back and looked at it and saw the changes, that's what I get for multitasking lol
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