[Diy_efi] RE: Throttling intake air -- references

[Brian Michalk]

Interesting.  It's a wildly different regime than the one I'm interested in
though.  I'm looking at it from efficiency.  Airplane engines operate hour
after hour at the same throttle setting.  As far as I know, theres never
been a Cessna 210 driver that complained about turbo lag.

What kind of miles per gallon do these cars get?
Extrapolating my aircraft performance to car-speak, I'm expecting about 20
mpg, plus or minus 4mpg at 180 miles per hour.

> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Axel Rietschin
> Sent: Wednesday, January 15, 2003 5:14 AM
> To: List for general do-it-yourself EFI talk
> Subject: Re: [Diy_efi] RE: Throttling intake air -- references
>
>
> ----- 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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