[Diy_efi] RE: Throttling intake air -- references

[Mike]

What I was refering to was before engine *and* turbo,
few mls of air and fuel vs lots of mls of exhaust gas.

Thing about this:-

You are driving along watching your boost gauge sit at say 8psi
and you can reduce pedal/throttle pressure with no ill effects
to reach say 4psi, no problems...

So clearly, the input to the engine/turbo combination is
the uncombusted (unamplified) input,

rgds

mike



At 03:33 PM 15/1/2003 -0500, you wrote:
>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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