Bleed Valves are not Regulators.
Electronic boost controllers, as determined in the automotive
industry, operate using a completely different principal and cost far more.
Although in theory they do exactly the same job.
Bleed Valves due to their design run through / bleed off through very small
orifices. The problems of boost spiking and boost drop off are as a direct
result of this.
Initially, when turbo's boosts, the bleed valve can cope with the air flow and
operates by reducing the air pressure on the actuator. However, within a very
short period of time,the air flow through the orifice becomes too great for it to
cope with and turbulence occurs. The valve might just as well be closed off when
this happens as the amount of air the valve is capable of bleeding off becomes insignificant.
This effect causes the 'spike' and 'drop off' syndrome always associated with
bleed valves & is exaggerated more-so on higher boost applications