Base Freq. for water injection

[John Dammeyer]

At 01:08 PM 26/11/1997 +1300, you wrote:
>Hi Clare and all
>
>Clare wrote:
>> What's wrong with using engine rpm to trigger, and just vary the on
>> time?
>
>Like I said it's simple. 
>I'm planing on using it with a knock sensor. The knock sensor unit I want
to use has 3 
>leds showing the amount of knock, I'll set it up so that the water injector
turns on when 
>the second led comes on hopefully stopping detonation.
>
>Has anyone ever done/thought of using a knock sensor to control boost ?
>ie keep the boost rising untill it knocks then bring it back a bit.....this
would take into 
>account air temp, altitude etc and give you max boost for the conditions.......
>
It's what my SAAB Turbo does according to the user manual.  Real life
experience shows that the grade of gasoline does indeed affect both power
and knock.  ie: Knock happens sooner under har accel. with lower octane
gasoline and the car is also not as zippy.  I imagine the waste gate opens
sooner too but the boost gauge isn't precise enough to tell the difference.

John

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