변속기 오일 교환PistonHeads★ 신뢰도 4.1 (높음)

포르쉐 카이엔 수리 사례

9YA (2017-현재) · 3.0 V6

2026. 10. 27. 작업

난이도 & 준비물

증상

This is brilliant. I shall follow with interest. I must echo it seems a shame to change a base-spec car - I’m enjoying the minimal interior without centre console - but I can appreciate the need for a solid platform to work from.

처리 내용

I should probably add a bit of detail to what we're trying to achieve in the design of this rad duct as some of the elements will make a bit more sense then. Essentially what we're doing here is creating a compact, multi axis diffuser feeding a horizontal heat exchanger. These kind of multi-axis diffuser is what you'll see in proper, modern day, complex racing cars.... only they are composite structures with a ten man team behind them and we're doing it with sheet ally, a copy of Fusion and a beer in the evening This kind of diffuser is what is known as a 3D diffuser (we won't call it a true 3D diffuser as it technically has no upper surface) as it combines both vertical and horizontal expansion and differs from a more conventional box duct or 2D diffuser in that the planform expansion of the duct gives us the same area ratio with lower local diffusion angles which reduces seperation risk and gives a more efficient pressure recovery overall. The two angle floor of the diffuser keeps the initial expansion shallow which helps avoid seperation just after the inlet duct then ramps more aggresively into the core. This coupled with the angled walls of the diffuser creates a diffuser which should (in theory) minimise pressure drop as the diffuser area expands and present a relatively equal amount of air across the radiator core thus optimising our use of the core. Arguable we're suboptimal in the angles of the diffuser elements but this is package driven and we're not so far away that it's pointless trying.One of the key challenges here is the size of the inlet duct being smaller than the overall diffuser width, this is a bit of a problem as whilst the inlet duct is located well (high pressure area at the nose of the car) the total width is limited by the area available in the monocoque to pass it through the front of the frunk. When you have a much narrower inlet than you do diffuser you essentially have a high velocity jet entering the diffuser around the centre line whi