[Diy_efi] RE: Throttling intake air -- references

Dave Dahlgren ddahlgren at snet.net
Wed Jan 15 20:10:35 GMT 2003


I have been reading along with interest on this thread.. There is a part that
seems to escape me though. From what I can follow the reason to add a throttle
between the compressor and engine is to control the the boost. The reasoning
behind it from what i can follow is that it is the unamplified input and
therefore more elegant in a control scheme. How can that be? The exhaust is the
input to the turbo charger. We are controlling the output of the turbocharger by
controlling it's input variable. It ( the exhaust) drives the exhaust turbine (
the input stage to the supercharger) which is connected to the compressor (the
output stage as far as i can see). So how is throttling the compressor output
controlling the primary unamplified input? I can easily see how it will control
boost and is another way to skin the cat so to speak. I just don't follow the
logic involved.
Dave Dahlgren


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