[Diy_efi] RE: Throttling intake air -- references

[Axel Rietschin]

----- Original Message -----
From: "Brian Michalk" <michalk at awpi.com>

> Therefore it does not make any sense (efficiency-wise) to have a
> turbo working against a partially closed intake throttle body.

The BMW F1 turbo engine worked this way, by-wire throttle before the turbo
and no wastegate at all with an enormous turbine housing, but this engine
was known to have a *huge* turbo-lag and a narrow powerband making it almost
undriveable.

Modern state-of-the-art turbo engines (WRC and CART) have port throttles,
very small turbine housings, massive (and aggressively opened) wastegates,
no lag and wide powerbands. The current 12'000 rpm Cosworth CART engine also
has a 9th by-wire throttle just before the plenum chamber, not sure what it
is used for.

hth,
Axel


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