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Kyosho Inferno MP9 TKI4 1/8 Buggy Kit

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Kyosho Inferno MP9 TKI4 1/8 Buggy Kit

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Old 11-05-2018, 09:06 AM   -   Wikipost
R/C Tech ForumsThread Wiki: Kyosho Inferno MP9 TKI4 1/8 Buggy Kit
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Last edit by: 30Tooth
Picked up a TKI3 and want to upgrade to TKI4 ? Here are all the updated parts:

Shocks

IF347-155 1.5X5 Pistons
IF471-01 Front Shock Body
IF470-01 Rear Shock Body
IF470-03BK Shock Adjust Dial
IFW154 Boots
IF346-05C Shock End Set

Wing

IF491BK Wing
IFW460B Wing Mount/Stay

Rear End

IFH006W Wheel
IF490 HUB
IF490-01 Hub Insert
IF492 Shock Pin
IF423HB Rear Arm
IF287 Hard Upper Rod Rear

Front End

IF489 Steering Rod Set
IF488 Knuckles
IF487H Front Arm
IFW458 Hard Lower Pin
IFW425 93MM CVD
IF286 Hard Upper Rod
IF486 Lower Susp Holder
IFW459 Servo Saver (Hard)
IF446B Ackerman Arm
IF426-64.5 Susp Shaft


Other

IF469B Filter
97035LW-13 Clutch Bell
IF453B Body Mount
IFW107GM Hexes
W300910 Washer
IF443B Center Diff Plate
IF444C Tank
IF479B Radio Box
96772 13x16x0.15mm Shim
IF481B Fuel Tank Stay
IFW336GM Wheelnut
IFB008 TKI4 Body
IFD403W TKI4 Decal

---------------------------

Another option if you want TKI4 Durability but TKI3 geometry of the front arm is :

IF493 Front Arm (Updated MP9 front arms replaces IF427B as a direct fit. Left and right.)

They use the older TKI3 captured outer hinge pin and screw. But if you just reem out the the outer hole you can use TKI hinge-pin/nut (IFW458)
---------------------------

Optional Updates / New Parts:

IFW469 IFW469 Aeration Cap Set(Threaded Big Shock/MP9)

IFW473 New Brake Pads (Sept 2017)

Optional Alu front hubs:
- IFW412 - 13 deg (like stock plastic ones)
- IFW436 - 16 deg
- IFW474 - 17.5 deg
- IFW461 - 19deg

M2C 1mm engine spacer: M2C9610

Body Options
New Bitty Force Body

Tebo's Build Videos

Video #1

Video #2

Video #3

Video #4

Video #5

Video #6

Original Kyosho MP9 TKI Thread
_____________________

Baseline setups from Joonas.




_____________________

Shock build with vented cap and compensator.

You have to use the HC diaphragms (if346-09,stock TKI3 and if not mistaken TKI4 too, yes the thin ones no one likes), aeration caps without the bleeder screw or mod the stock caps by drilling a 1.5 or 2mm hole on the top facing up or at an angle (doesn't matter the size or angle, it just for bleeding pressure behind the diaphragm and allow the foam compensator to breathe) and a 10mm width x 3.5mm height dome shaped foam compensator made from old open cell inserts or dishwasher sponge. The foam compensator has to be soft enough not to add rebound but allow the diaphragm to regain it's shape.

Setup Sheet and Tuning

The setup sheet is getting crowded with all options but don't worry once you get acquainted with the parts will make sense.
Run the car as is, more than probably you won't need anything else. Using my setup as an example:

Diff gear has two options, normal and LSD. LSD stands for limited slip differential and is like using thick oils because you can't tune coast from locked.

Shock setup is a bit more confusing, you have two shock body sizes (S and M and truggy sized rear shocks that only the first version had so forget this one), three types of pistons (flat holes and surfaces, flat holes tapered surface and tapered holes with tapered surface): tapered have most pack, then black(simple piston) and then white because length of the holes. Then you have different length springs to account for different shock sizes, for a standard wheelbase/no weights car a good combo is Light Blue front and Orange rear, if you extend the wheelbase then I expect the included Light Blue rear springs be money instead of Orange.

Ride height is self explanatory, start always with lower arms parallel because good suspension geometry will be far easier to achieve. Rebound is used as total shock length no idea why they call it rebound, either use total shock length or maximum exposed shock shaft length. Camber self explanatory, run more camber in the front than the rear to make the car oversteer and more rear than front to make it understeer(grossly oversimplified).

Toe same deal as camber(again grossly oversimplified) but this you have to run the least amount you can. I use around 2-2.5 on my cars, never more as I can find traction by other means with way less impact on performance.

Wheelbase is a powerful setting, changes a lot of stuff. Let's just say that it can make the car behave neutral or not in that small range. Try for yourself. I like to use the longest setting and tune from there.

Shock position self explanatory, something most don't change and I don't play around with it. I do have a method but involves much work (with the car bottomed out, see which position places the shock 90 to the lower arm and then chose spring from a couple equations and bam done, I can do it easily so anyone interested just ask.

Rear upper arm position is again an important setting, you change both camber gain and roll centre. The rear roll centre should be higher than the front, that's why I use the middle hole inner row as a starting setup.

Suspension arm, self explanatory: there are two different length arms and each has a hard and a normal flex plastic.

Front suspension bushing is for upper arm alignment, also same deal as rear upper arm position changes both camber gain and roll centre.

Suspension holder is for kick up (pro dive is the correct naming). I believe tki4 9 of kick up to be better than 9 of kick up using the tki3 parts because you can run the car lower (26mm front ride height) and use the +2mm front shock tower if there's too much camber gain or it's stiff in roll. So use +2mm lowered roll centre to keep most stuff unchanged or use the bushings with the dot up to lower the roll centre a bit more, doesn't hurt anything.

Front hub carrier, self explanatory. I am trying to use the out hole on top of the carrier as it is better during braking and accelerating. Together with the higher front roll centre on the tki4 should provide enough camber gain during cornering if not then more caster will do.

Rear roll centre and anti squat(wrongly called skid angle). Again same thinking as the front, lower the car and keep roll centre in the same height as before(that will need a change in upper arm position which my setup does). Anti squat is changed only if the pitching motion causes too much camber to be gained by the rear tires on power, nothing more.

Front knuckle, apparently there's a difference in the Ackerman arm. Can't say anything about them as I don't know enough about both.

Rear hub carrier,there is one made of plastic (which doesn't have offset apparently so it's suited to long arm setting) and three aluminium versions. One similar to the plastic one, other with offset and a new one with offset and adjustable hub height.

Rear tread can be used as arm length and outboard toe(never seen it being used but the possibility is there). Longer is better most of the time (only on really low traction).

Chassis brace, wheel hub, sway bars and weight are self explanatory. No need to use weights nor other hubs. A couple of roll bars would be a nice addition. About the aluminium braces I am torn, I guess the car doesn't need flex with this setup but won't recommend the stiffer braces but the lower engine mount is very nice to deal with flex around the clutch.

Wing and wing stay are like the d81x had regarding height and position. The wing should be as low and have free airflow as possible.

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Old 03-22-2017, 07:28 PM
  #1396  
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Originally Posted by 1fastPIRATE
pretty sure he told me he ran 553.
Probably just a mistake, i also saw were elliot ran 6500 5500 in shock oil and right away caught my eye
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Old 03-22-2017, 08:40 PM
  #1397  
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Originally Posted by Rafa_kyosho
Probably just a mistake, i also saw were elliot ran 6500 5500 in shock oil and right away caught my eye
yeah i chatted with him for a sec about diff oils and a few things. i was originally running 573 and i switched to what he was running which was 553.

anyone at silverstate run the tall front tower and shocks?

I also figured out I was pretty overweight for tech. especially compared to a couple others. anyone put their mp9 on a diet? anyone use carbon fiber pieces or alumin screws?
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Old 03-22-2017, 08:44 PM
  #1398  
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Tebo Build Video #1

Video #2

Video #3

Video #4

Video #5

Video #6
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Old 03-23-2017, 05:50 AM
  #1399  
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Originally Posted by 1fastPIRATE
I also figured out I was pretty overweight for tech. especially compared to a couple others. anyone put their mp9 on a diet? anyone use carbon fiber pieces or alumin screws?
I have all balls in the joints in alu, shock stand offs in alu, titanium turnbuckles, titanium screws in places like radio tray, wing mount and servo. I also use alu pins in the diffs for the sprider gears and carbon wing washers. The weight difference are about 100-150 g.
Haven't run the car yet, will post pics!

Last edited by Arctic RC; 03-23-2017 at 07:23 AM.
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Old 03-23-2017, 12:38 PM
  #1400  
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Thanks for re-posting, I've added these links to the Wiki
Jeff Werner likes this.
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Old 03-23-2017, 06:58 PM
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Originally Posted by 1fastPIRATE
yeah i chatted with him for a sec about diff oils and a few things. i was originally running 573 and i switched to what he was running which was 553.

anyone at silverstate run the tall front tower and shocks?

I also figured out I was pretty overweight for tech. especially compared to a couple others. anyone put their mp9 on a diet? anyone use carbon fiber pieces or alumin screws?
Overweight for tech? Really? I never figured they would have a maximum weight, or are you simply saying that you have a fat car that isn't close to worrying about being too light? The kyosho is a heavy car, I think that is one of the reasons it does so well as it can get traction where lighter cars don't. We don't have tech here in Vietnam so I have never weighed it, but my friend is all worried about how heavy his is, he is buying all the light weight screws and everything he can find. I have some of the light weight option but it is for look rather than weight reduction
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Old 03-24-2017, 02:16 AM
  #1402  
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Default Starter box

Ok i am new to kyosho but not nitro. Although is been awhile couple years. I can't seem to get my mp9 to fit perfectly on starter box. Tried my ofna blue box and mugen. It's like the side guards prevent it form just sitting just right. Looking to get it to just fall into place so pit man never has to fight it. Any suggestions?
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Old 03-24-2017, 09:10 AM
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Originally Posted by mixedguy
Ok i am new to kyosho but not nitro. Although is been awhile couple years. I can't seem to get my mp9 to fit perfectly on starter box. Tried my ofna blue box and mugen. It's like the side guards prevent it form just sitting just right. Looking to get it to just fall into place so pit man never has to fight it. Any suggestions?
Used an ofna blue for 2 years. Not sure what the issue is...I'm guessing the rear between guards and arm/mudguards ? Pics help.
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Old 03-24-2017, 05:49 PM
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Default Yes rear

The rear post on the box. Can ge one on. But the other is to tight. Distance between mud guard and side guard is tight.
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Old 03-26-2017, 02:57 PM
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Hi. Can anyone tell me what the difference 16deg Alloy C-hubs will make to the cars handling/steering over 13deg Alloy C-hubs?

Thanks..
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Old 03-26-2017, 04:43 PM
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Originally Posted by Novarossilosi
Hi. Can anyone tell me what the difference 16deg Alloy C-hubs will make to the cars handling/steering over 13deg Alloy C-hubs?

Thanks..
less aggressive turn-in, slightly more on power steer.
handles bumps better on power.

the 16 blocks are a great tuning option to have.
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Old 03-26-2017, 06:35 PM
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Originally Posted by mixedguy
The rear post on the box. Can ge one on. But the other is to tight. Distance between mud guard and side guard is tight.
Hmm agreed its tight, but never had issues making it work. Rear posts just might not go in tight like you want it. Sold my Ofna blues so can't provide any pics to help, sorry.
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Old 03-27-2017, 01:26 AM
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Originally Posted by jeromerc
Overweight for tech? Really? I never figured they would have a maximum weight, or are you simply saying that you have a fat car that isn't close to worrying about being too light? The kyosho is a heavy car, I think that is one of the reasons it does so well as it can get traction where lighter cars don't. We don't have tech here in Vietnam so I have never weighed it, but my friend is all worried about how heavy his is, he is buying all the light weight screws and everything he can find. I have some of the light weight option but it is for look rather than weight reduction
Sorry, i should said i was way over minimum weight. Id like to get it as light as possible then add weight where i want it. Im hoping to improve the way the car rotates and maybe improve power to weight ratio as well as run times...
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Old 03-27-2017, 02:55 AM
  #1409  
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One interesting moment i've realized: despite being Reds-sponsored driver, Boots runs stock Kyo clutch system. Same about Tebo's car: no Buku or something highly "liked" here on rctech. Any ideas why?
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Old 03-27-2017, 05:45 AM
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Originally Posted by vandalzzz
One interesting moment i've realized: despite being Reds-sponsored driver, Boots runs stock Kyo clutch system. Same about Tebo's car: no Buku or something highly "liked" here on rctech. Any ideas why?
kyosho will not let them
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