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Discussion Starter #1
Anybody used one of them before??? On a skyline of course (not on the cheap boy racers motors!!).. How reliable is it?? Any ideas??
 

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Yes I`ve got one on mine, very primitave compared to the Electronic boost controllers but for 0.3 Bar I wasn`t going to spend £350+.

Its ok for small increases but a controller is much better as it`ll maintain the boost where as a bleed valve will not ie. boost may start to drop.

Steve
 

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Josewick, Steve is spot on with this one.

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
 
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