What about a cabin-adjustable wastegate? You could dump exhaust through the wastegate for low-power cruising if you wanted to decrease the boost.
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Originally Posted by dozer
So I've always been interested in setting things up to get boost at very low power-settings. Yet I need a turbo system that works well at near full power as well; because every 10 curves there's another mountain to climb... 
In lieu of the $$$ VGT's that I can't afford, I've often wondered about experimenting with a tandem turbo setup. Something tiny from a sub-2L, in tandem with either a stock 617 turbo, or even a slightly larger one (to keep backpressure down at the upper-end of the power/rpm range).
My first guess is to use backpressure to control the gates that'd switch between the two turbos...but I've really not thought it all out in detail yet.
So many experiments to try, so little time.... |