WRC main class in 2025

[Fast Eddie WRC]

Analysis of the 2025 Rally1 2.0 Cars after Rallye Monte-Carlo...

https://www.wrcwings.tech/2025/02/04...ally1-car-2-0/

[Steve Boyd]

Analysis of the 2025 Rally1 2.0 Cars after Rallye Monte-Carlo...

https://www.wrcwings.tech/2025/02/04...ally1-car-2-0/

Well I never!
Who would have thought that there was a camshaft associated with the hybrid unit that needed to be removed. I think he meant the hybrid motor driveshaft.

I do wonder if the bloke writing these articles is as technically savvy as he'd like you to think. If he really wanted to explain about some tecnical aerodynamics, he could have gone into how a 5.5% reduction in turbo restrictor cross section gives a 6.5% reduction in power. The explanation is the boundary layer effect where about a 2 mm layer of the air next to the restrictor doesn't flow as fast as the air across most of the section. As a result a reduction from 36 to 35 mm reduces the flow unaffected by the boundary layer by about 32 to 31 mm - a bit over 6%.

[Fast Eddie WRC]

Well I never!
Who would have thought that there was a camshaft associated with the hybrid unit that needed to be removed. I think he meant the hybrid motor driveshaft.

I do wonder if the bloke writing these articles is as technically savvy as he'd like you to think. If he really wanted to explain about some tecnical aerodynamics, he could have gone into how a 5.5% reduction in turbo restrictor cross section gives a 6.5% reduction in power. The explanation is the boundary layer effect where about a 2 mm layer of the air next to the restrictor doesn't flow as fast as the air across most of the section. As a result a reduction from 36 to 35 mm reduces the flow unaffected by the boundary layer by about 32 to 31 mm - a bit over 6%.

To be fair, English isn't his first language and I'm sure we all knew he meant driveshaft.

For me he keeps quite technical subject areas simple enough for ordinary people to understand.

If you can do better, maybe you could write a piece on the full effect of the changes ?

[Mary Mary]

You can contact Lluis on the page and he visits this forum too, so you can point something out without being an ass about it. You also paid zero cents to read that, and it's sad to see the suggestion somebody who offers so much free time and expertise isn't doing enough. I appreciate your expertise and contributions too Steve, but there isn't a competition.

[Steve Boyd]

You can contact Lluis on the page and he visits this forum too, so you can point something out without being an ass about it. You also paid zero cents to read that, and it's sad to see the suggestion somebody who offers so much free time and expertise isn't doing enough. I appreciate your expertise and contributions too Steve, but there isn't a competition.

Fair enough.
I'm not a fluid mechanics expert by any means, though I did study it a bit as part of my enginering training 50 years ago, and haven't used it since. It's just that every time I read one of his articles I come away disapointed that I didn't learn anything other than visual observations of the cars evolution. While that may be enough for some, I'd like to see some more detailed explanations of the statements he makes.