26-08-2014, 09:09 PM
I think the confusion is over volumetric flow vs mass flow - one's about the space it takes up, one's about how much it weighs - cooler, denser air weighs more!
Air MASS is what we're interested in - however we think about turbochargers being volumetric movers.
With regards to vane position - you want the vanes to stay closed for a little while, it's WAY too laggy in your video, this should spool way earlier than that - a manual boost controller will help - I used mine with an MBC - you've just got to monitor EMPs as you can quickly cause damaging EMPs with vane stop adjustment - so you've got to go easy on it.
There's this idea that an MBC keeps the boost away from the actuator then suddenly opens it, which it doesn't! The ball and spring "flutters" up and down as air pressure increases, the preload on that spring dictates when it starts fluttering, the reason they're better than a bleed valve is that a bleed valve only works if there's air flow - if the air isn't moving, eventually the pressure will equalise - just much slower due to the restriction.
Air MASS is what we're interested in - however we think about turbochargers being volumetric movers.
With regards to vane position - you want the vanes to stay closed for a little while, it's WAY too laggy in your video, this should spool way earlier than that - a manual boost controller will help - I used mine with an MBC - you've just got to monitor EMPs as you can quickly cause damaging EMPs with vane stop adjustment - so you've got to go easy on it.
There's this idea that an MBC keeps the boost away from the actuator then suddenly opens it, which it doesn't! The ball and spring "flutters" up and down as air pressure increases, the preload on that spring dictates when it starts fluttering, the reason they're better than a bleed valve is that a bleed valve only works if there's air flow - if the air isn't moving, eventually the pressure will equalise - just much slower due to the restriction.
