broken turbo

[Greg Hermann]

Hi Dave--

One more thing. see bottom.
>
>OK, you mis-spoke here, and I missed it before. Duty cycle is the % of time
>that an injector is open as a percent of the total TIME IN A CYCLE AT AN
>GIVEN ENGINE SPEED--in other words, the total % of the total time that the
>injector is open.
>>>

>>This is where I think there could be a problem - 2% duty cycle doesn't
>>mean 2% of rated flow I don't think,
>
>It does..
>
>as we both agree that duty cycle
>>is relative to available open time which varies with rpm. (20 ms vs. 120 ms)
>
>>I think that pulse width is what determines flow.
>
>It does, in the sense of fuel flow PER CYCLE, but duty cycle determines
>fuel flow PER UNIT TIME. The second is what relates pretty directly to HP
>output.
>
>>2% at 1000 rpm is a lot greater width than 2% at 6000 rpm (when I say
>>greater width I of course mean time length)
>
>Also,  you are forgetting how tremendously much longer 98% off time is at
>idle (117.6 ms.) vs. 20% off time (4 ms.) at WOT 6000 rpm is. This is where
>the great disparity in fuel flow per unit time comes from.
>>
>
>>
Pulse  Width relates directly to Torque.

Duty Cycle relates directly to HP.

So 2ms./16ms means you are making 1/8 the torque at idle that you are at
WOT. (175 ft lbs./8=22 ft. lbs at idle).

Because you are doing so at 1/6 the speed, you are only making 1/48 the HP
at idle.

>
>>Regards, Greg