¶ King Pin Inclination angle (KPI)
What does KPI 0 do: KPI 0 provides more steering response, more off power steering, and a more agile fast feeling car.
When to try KPI 0: Try KPI 0 if you want more steering response, off power steering, or if you have trouble controlling rear grip when accelerating out of corners.
What does KPI 1 do: KPI 1 smooths out initial response and steering a lot. A lot smoother and easier car to drive.
When to try KPI 1: Try KPI 1 when your car is too responsive and hard to drive. Try it even when your car feels good, because sometimes you will be faster!
KPI Explained by David Ronnefalk
- KPI0 will give you a car which turn into the corner harder. As you going through the corner you will not notice but it will scrub your corner speed a little bit and the car can get stuck. Out of the corner it has the tendency of a pushy feeling when you accelerate with wheels turned, if your driving style is different from mine and you completed the corner fully and then accelerate straight out of it, you will not notice the pushy feeling and instead you will feel very secure with this config as the rear end won’t keep turning on you.
- KPI1 has a pushy feeling coming into corners. Very easy however in high grip situations and here I definitely think it helps anyone. If track doesn’t have this high grip conditions, maybe KPI0 will be better for many as you will prefer it coming out of the corner. Back to KPI1, after you have entered the corner and even though it might have given you the pushy feeling, it will then keep your corner speed up and the car won’t get stuck in the middle of it. Your corner speed will be higher and for me personally, the car keeps turning a bit coming out of the corner as I accelerate pretty early and have felt that KPI0 gives me too much push on corner exit. KPI1 helps me in this situation.
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| KPI 0 (left) vs KPI 1 (right) - Photo credit: David Baumann |
JQRacingTV video explanation on KPI angles with track video:
https://www.youtube.com/watch?v=m5rkoNveHUI
¶ Identifying hubs (Caster/KPI)
2024 parts have engraving of which caster/KPI as below:
The first number is the KPI angle, with the second number being the caster angle (left is KPI0.5/Caster 1, right is KPI1/Caster1).
¶ Previous parts
For previous iterations, to identify which caster block you have, there are marking on the lower rear section as highlighted below:
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The shape of the marking denotes the KPI angle:
Circles = KPI 0
Ovals = KPI 1
The number of markings denotes the caster angle:
Caster 1 = 1 marking
Caster 2 = 2 markings
¶ Changing from KPI-0 to KPI-1
You will need to following parts to change from a KPI-0 front end to a KPI-1 front end.
MYB0047(ALU) Lower King Pins KPI-1
MYB0042B Left KPI-1 Steering Knuckle
MYB0043B Right KPI-1 Steering Knuckle
Your KPI-1 C-Hub of preference
¶ Changing from KPI-1 to KPI-0
You will need to following parts to change from a KPI-1 front end to a KPI-0 front end.
MYB0046 Steel King Pins
MYB0041 Left or Right Steering Knuckle (you need two)
Your KPI-0 C-Hub of preference
The upper king pins are the same for KPI-0 and KPI-1. The lower king pins are different as the hingepin runs through the king pin for KPI-1.
¶ KPI 0.5
KPI-0.5 is an option to provide a midway option between KPI-1 and KPI-0. It has been found that KPI-0 is too aggressive for many drivers, so KPI-0.5 will be preferred by most who need more initial grip (tight or slippy tracks).
You will need to following parts for KPI-0.5:
MYB0046 Steel King Pins (upper)
MYB0047-01 Steel Lower King Pins KPI-0.5
MYB0042B-01 Left KPI-0.5 Steering Knuckle
MYB0043B-01 Right KPI-0.5 Steering Knuckle
Your KPI-0.5 C-Hub of preference
¶ Part Numbers
¶ 2024 Part Number Update
For the 2024, Mayako has released front C-Hubs with a link insert, allowing fine adjustment of link height.
KPI 0.5 is also new for 2024. The new knuckles below also allow for use of front Universal Driveshaft. Front knuckle spacer for CVD (MYB0186) is required behind the inner bearing to build with the CVD option.
To use the 2024 knuckles with previous hubs, you just use a single red knuckle height shim.
| Part Number | Description | Webshop |
|---|---|---|
| MYB0039A | Left C-Hub KPI-0.5, Caster 1 with link insert | Link |
| MYB0039A-01 | Left C-Hub KPI-0.5, Caster 2 with link insert | Link |
| MYB0039A-02 | Left C-Hub KPI-1, Caster 1 with link insert | Link |
| MYB0039A-03 | Left C-Hub KPI-1, Caster 2 with link insert | Link |
| MYB0040A | Right C-Hub KPI-0.5 Caster 1 with link insert | Link |
| MYB0040A-01 | Right C-Hub KPI-0.5 Caster 2 with link insert | Link |
| MYB0040A-02 | Right C-Hub KPI-1 Caster 1 with link insert | Link |
| MYB0040A-03 | Right C-Hub KPI-1 Caster 2 with link insert | Link |
| MYB0042B | Left KPI-1 Steering Kncukle | Link |
| MYB0042B-01 | Left KPI-0.5 Steering Knuckle | Link |
| MYB0043B | Right KPI-1 Steering Knuckle | Link |
| MYB0043B-01 | Right KPI-0.5 Steering Knuckle | Link |
| MYB0046 | Steel King Pins | Link |
| MYB0047 | Lower King Pins KPI-1 | Link |
| MYB0047-01 | Steel Lower King Pins KPI-0.5 | Link |
| MYB0186 | Front Knuckle Spacer Shim | Link |
¶ Previous Parts
| Part Number | Description |
|---|---|
| MYB0039 | Left C-Hub KPI-0, Caster 1 for Mayako MX8 (-22) |
| MYB0039-01 | Left C-Hub KPI-0, Caster 2 for Mayako MX8 (-22) |
| MYB0039-02 | Left C-Hub KPI-1, Caster 1 for Mayako MX8 (-22) |
| MYB0039-03 | Left C-Hub KPI-1, Caster 2 for Mayako MX8 (-22) |
| MYB0040 | Right C-Hub KPI-0, Caster 1 for Mayako MX8 (-22) |
| MYB0040-01 | Right C-Hub KPI-0, Caster 2 for Mayako MX8 (-22) |
| MYB0040A-01 | Right C-Hub KPI-0.5 Caster 2 with link insert |
| MYB0040-02 | Right C-Hub KPI-1, Caster 1 for Mayako MX8 (-22) |
| MYB0040-03 | Right C-Hub KPI-1, Caster 2 for Mayako MX8 (-22) |
| MYB0041 | Left or Right Steering Knuckle KPI-0 for Mayako MX8 (-22) |
| MYB0042 | Left KPI-1 Steering Knuckle for Mayako MX8 (-22) |
| MYB0043 | Right KPI-1 Steering Knuckle for Mayako MX8 (-22) |
| MYB0046 | Steel King Pins |
| MYB0047 | Lower King Pins KPI-1 |