Agree, however the better flow out of the flapper hole should allow flapper/control adjustments via the actuator rod to require less "slow" mechanical movement and retain better boost control (aside from possibility of flapper blowing open), that is where I was going... but the actuator rod may move plenty fast enough and this all be negligable.
Also, it is possible that when you start dealing with modified housings (bore/diffuser/clipping/etc)... that the flapper size needs to be increased to have an equal affect on control; this thought I am still experimenting with though.
So, if there is anything else needed to formulate this let me know... but 20mm/23mm/27mm (actual hole size) is what I am after.
Rob
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Originally Posted by Multiades
Anyhow, why the interest in larger wastegate flappers at all? It WON'T decrease the turbine backpressure for an underutilized compressor because any reduction in pre-turbine pressure would result in some decrease in boost pressure - the two are intrinsically interrelated. If your boost creeps up, you need more flapper area, if it falls off or stays constant, you don't. Simple as that.
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