[Diy_efi] New BMW 760, fuel pressure, direct inject

[Mike]

At 03:13 PM 1/8/03 +1100, you wrote:
>Some info about toyota direct injection
>
>http://www.sae.org/automag/globalview_01-00/02.htm
>
>About the Crown and 2jz-fse - "pressure between 8 and 13 Mpa (1160 and
>1890 psi)".

Ah ok, so this is synchronous - no need for coil to control the injector,
only done by fuel pressure - and of course spring controls in head of
the injector. Am I misinterpreting this, doesnt seem like doubling the
pressure (almost) would give enough dynamic range - unless a 'log'
flow factor was built into the mechanics of the injector nozzle and
non-return valve - logical I suppose ?

ie. Fuel pressure goes up by 50% results in much more than 50% more
flow so at max pressure it could achieve 20:1 to 50:1 dynamic range,
any mech engineers out there to comment on how feasible and reproducable
this is in that environment ?

rgds

mike


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