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Originally Posted by DAEMANO
I find this to be a fun thing to kick around from an engineering perspective, but from a practical perspective it doesn't really add up.
What's funny is that the variable boost idea is generally chased more aggressively by people without the kit. Kind of like "this would be a perfect kit if boost was tied to engine speed". In practice, the WOT pedal switch seems to work very well.
Driving the car with the amount of boost it generates AND the gradual speed that the compressor ramps up makes the power very controllable, even mid-corner (depending on the corner of course).
I've come to the understanding that the potential gain from variable boost versus the complexity of building & tuning probably offers diminished returns at best and limited value worst. To be short, maybe variable boost for this application just isn't worth it. What do you think?
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I tend to agree that in our boost range the variable speed isn't really a big deal. But if we ever end up doubling the amount of boosts for example, I could see variable boost being fun and useful. If nothing else, it would just bring the engine closer to a true NA experience, where torque is more or less linearly related to throttle position (ignoring stock torque dips and such). But then you get the same problem -- what if I floor it at 2k RPM in sixth?
Either way, it requires the driver to be smart about when they go WOT. That is something that is common between both binary and variable boost and will always be part of driving a car with any non-parasitic boost (and most traditional boost if you're in a certain power band). So you're probably right, the benefit is most likely not worth it.
The biggest benefit would be the elimination of the 0.5s-1.0s compressor ramp, since you would likely already be spinning at a closer speed than DR or natural aspiration through the airbox.
But if you tell the traditional turbo guys that we're upset that it takes us a half second to get to full spool, I think they'd give us a pretty hard time.
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