broken turbo

[goflo at pacbell.net]

Hi Ted

Keep in mind that power, in this case horsePOWER, is work performed
per unit of time. 
A one-squirter might have a 2 ms squirt at 600 rpm, and a 10 ms squirt 
at 6000 rpm. 
The 600 rpm cycle would be 200 ms so the 2 ms squirt corresponds to a 1%
duty cycle. 
At 6000 rpm the 20 ms cycle and 10 ms squirt means a 50% duty cycle. The
injection time is 5X longer, 10X more often...

Take a look at hp/torque curves and think about what's going on.

Regards, Jack

Greg Hermann wrote:
> 
> >In a message dated 12/20/98 9:01:59 PM Eastern Standard Time,
> >djwest at subcorp.com.au writes:
> >
> ><< I am getting injector pulse width of 2.4 msec at 1000 rpm. This is
> > more than 1/5 total width. Based on an engine that produces 200 bhp at
> > around 6000 rpm this means that I am injecting enough fuel for about
> > 40 hp. This can't be right.
> >
> No , it is not. At 1000 rpm, you are only getting an injector squirt every
> 120 ms --- so at 2.4 ms. PW, your injector duty cycle at idle is only 2% or
> so. If you have an injector duty cycle of 80% at 200 HP @ 6000 rpm, that
> means that your idle HP is more like 5 HP, which is about right.
> 
> Regards, Greg