Volvo power pulse

[Vekke]

Hi,

Just read that Volvo has built a similar system in S90 what I was planning to build on my A8. They call it a power pulse and here is a video that explains the system how it works:

https://www.youtube.com/watch?v=WuwuXyuyfEw

What I dont understand is why they inject the air to exhaust side and not the inlet side?

I know that it can be done better but I cannot figure the real reason why the exhaust side...

[Frank Lee]

Volvo's goal was reduction of turbo lag so they sought to spool it up with a pshhht of compressed air rather than pshhhting into the intake, which also would have required some sort of fuel enrichment and still would have some turbo lag.

[MPGeo]

Interesting, although this pre-spooling concept is not exactly new...

I've seen CryO2 being used as the high pressure fluid medium (instead of air) in some drag applications... I know, I know, mostly everyone uses CryO2 for intake cooling... but it has been used in several different ways including releasing it directly into the exhaust system, pre-turbine inlet, just like with this Volvo concept. And also even used to directly spool the turbo as with the CryoCharger...

But I like the compressed air concept much better, since it's "free", and it's a sustainable system... I do wonder what the working pressure will be???