Boost vs. WGFV DC and DC vs. Temperature

[John Shost]

It's torque controlled, so you would need less boost at lower temperatures.
What are you reading for torque?

On Wed, 04 Apr 2001 20:58:31 -0700, Wallace White wrote:

>  Larry -
>  
>  Your duty cycle observations fit with what I've seen, in my limited
>  observation. I haven't seen more than 50% duty, even with my QLCC 1.8
>  bar chip. At colder temperatures the peak duty is lower.
>  
>  But those peak DC values were very brief, just right when I first hit
>  WOT. Then the pressure rises quickly and the DC decreases. It's like a
>  servo-controlled motor system, where the controller uses PWM
>  proportional to the distance from the target.
>  
>  Maybe your WGFV is partially blocked? Then it can't do quite as much
>  good as it should?
>  
>  Wait a second, you should be getting 1.2 bar (or 1.1 indicated at least)
>  without the WGFV cycling at all. (Or is that affected by ambient
>  pressure?) What pressure do you get if you electrically disconnect the
>  WGFV?
>  
>  - Wallace
>    '87 5kcstq 172k
>  
>  > Something that threw me for a loop was an extreme ambient temperature
>  > dependence on maximum DC.  I find my DC changes with ambient
temperature
>  > approximately hitting the following points: <40F=<10%, 50F=25%,
55F=30%,
>  > 60F=40% and >65F=50%.  Boost follows that predicted by duty cycle.  
This
>  > doesn't seem right but I haven't identified what is causing it.  It
>  > definitely reduces my boost in the winter.  Maybe I need to move to
Florida.





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