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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 2º-2.5º 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 90º 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 9º of kick up to be better than 9º 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 05-21-2018, 08:34 AM
  #2581  
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MP9 TKI4 Spec A on sale for a silly price right now on A-main !!!
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Old 05-21-2018, 11:08 AM
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Originally Posted by rjmakk
Hi all, are the mp9e suspension holders the same as the tki4?

https://www.dollarhobbyz.com/product...ings-inserts-1

Thanks
they should be yes
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Old 05-21-2018, 01:02 PM
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Thank you Houston!
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Old 05-21-2018, 02:47 PM
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Originally Posted by rjmakk
Thank you Houston!
Not exactly the same. MP9e standard kit uses the high mount front upper suspension holder IFW466. You need to grab the Anniversary edition spares kit.
Not sure what's up with the Mp9e - Amainmain stating no longer available and there's no mention of Anniversary Editions or otherwise.
Is someone asleep at the wheel over at Kyosho HQ?
Worlds Warm-up - 3 Kyosho drivers on the podium - 2 former, one current.
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Old 05-21-2018, 06:51 PM
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all the lower suspension holders should be the same .... mp9e tki should be the same as tki3 parts and mp9 tki4e would be same as tki4

there is high mount position and low mount position on tower and front upper arm holder plate .
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Old 05-21-2018, 08:16 PM
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DollarHobbyz pack all the lower holders and upper holder into the one pack. Great value but if you want an exact match of all holders (upper high mount vs standard mount, lower all the same in TKI4), you need to select from the right kit they've taken the parts. The TKI3 B holder for example isn't available in any of their spares.

But while I have your attention why don't any of the pros / semi pros use the current TKI4 steering geometry? I don't have the TKI3 geometry to compare but curious why the TKI4 parts aren't used.
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Old 05-21-2018, 10:36 PM
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Originally Posted by Matty A
DollarHobbyz pack all the lower holders and upper holder into the one pack. Great value but if you want an exact match of all holders (upper high mount vs standard mount, lower all the same in TKI4), you need to select from the right kit they've taken the parts. The TKI3 B holder for example isn't available in any of their spares.

But while I have your attention why don't any of the pros / semi pros use the current TKI4 steering geometry? I don't have the TKI3 geometry to compare but curious why the TKI4 parts aren't used.
I've been wondering the exact same thing.
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Old 05-22-2018, 08:20 AM
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Originally Posted by Matty A
DollarHobbyz pack all the lower holders and upper holder into the one pack. Great value but if you want an exact match of all holders (upper high mount vs standard mount, lower all the same in TKI4), you need to select from the right kit they've taken the parts. The TKI3 B holder for example isn't available in any of their spares.

But while I have your attention why don't any of the pros / semi pros use the current TKI4 steering geometry? I don't have the TKI3 geometry to compare but curious why the TKI4 parts aren't used.
the TKI3 geometry was a bit smoother feel .... i have been playing with many different combinations myself .... currently TKI3 shorter arms (wider inner pivot) with tki4 everything else . .... there are quite a few options of geometry for the front end actually .... also you can use ifw410 to change rear end dramatically as well .....
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Old 05-22-2018, 11:11 AM
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Default Mp9 chassis

Whats everyone using for replacement chassis?

My only thing i can keep finding is how different the flex is between Crap anno stock one and the replacement Hard anno

We have 3 options
M2c with replacement skids M2C2605
Kyosho Hard tki chassis KYOIF473
Fioroni Ergal Hard FIO-OT-UR900
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Old 05-22-2018, 01:54 PM
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Originally Posted by iplaygames
Whats everyone using for replacement chassis?

My only thing i can keep finding is how different the flex is between Crap anno stock one and the replacement Hard anno

We have 3 options
M2c with replacement skids M2C2605
Kyosho Hard tki chassis KYOIF473
Fioroni Ergal Hard FIO-OT-UR900
All of these are good picks sir. Go with cheapest.
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Old 05-22-2018, 04:21 PM
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Originally Posted by houston
the TKI3 geometry was a bit smoother feel .... i have been playing with many different combinations myself .... currently TKI3 shorter arms (wider inner pivot) with tki4 everything else . .... there are quite a few options of geometry for the front end actually .... also you can use ifw410 to change rear end dramatically as well .....
thanks for the info. There’s a huge amount to consider when tuning and I agree with previous comments that anyone playing at the elite level in any form of Motorsport can’t go it alone and expect to be competitive. Just look at what happened to Lightning McQueen in Cars! Being good behind the wheel is a skill set, tuning is a completely different skill set or sets if you break that into its many components. Still great fun tinkering for the weekend warrior.
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Old 05-22-2018, 08:37 PM
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Originally Posted by Motorman007
All of these are good picks sir. Go with cheapest.
yeah but was after what is most likely going to give close to same flex as the stock one.
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Old 05-22-2018, 09:18 PM
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Originally Posted by iplaygames
yeah but was after what is most likely going to give close to same flex as the stock one.
Unfortunately your crap standard chassis in the TKI4 is IF473 - (hard chassis). I have a new M2C chassis in front of me and aside from a couple of minor tweaks it looks and feels identical to the Kyosho version only cheaper. Not sure what you're comparing to but my other buggies have scratches though maybe a fraction thicker - Losi and Tekno.
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Old 05-23-2018, 07:53 AM
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Originally Posted by iplaygames
yeah but was after what is most likely going to give close to same flex as the stock one.
The answer is, likely none will. My advice would be pick one (i like the m2c due to the steel skidplate inserts) then tune around that then buy the same in future.
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Old 05-25-2018, 12:43 PM
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Any Parts that should be replaced or upgraded right out to the box on the 10th Anniversary TKI4?
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