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Message
One of the things I
concluded fooling around with the MAP filtering was that it seemed to need about
3 cu. in. of volume (line plus filter, or whatever) to act as an effective
“spring”. Have you estimated how much volume you have?
I never tried to figure out the volume of the tubing, partly
because I can't actually remember how it connects behind the firewall. I
have two lines running back. Originally, one went from one port on the TWM
to the A controller and fuel pressure regulator. The second went from
the other port on the TWM to the B controller. When I found
that my B controller wouldn't idle worth a crap, I connected both lines
together near the TB. That made a world of difference in the B
controller, but didn't change A as far as I could tell. I concluded
that the fuel pressure regulator offers some pulse
dampening.
I was pretty depressed with the lack of success from my original
testing, but one of these days, I'm going to get back to it. It's just not
close to the top of my to-do list at the moment. In thinking back on
my original tests with the needle valve, I can only conclude that I have a small
leak in one of my lines to the EC-2 or regulator. Varying the needle valve
had almost no effect on the idle, until I closed it completely, then the engine
would start to sputter and die. If the hoses were perfectly sealed, and
you closed the valve without varying the throttle, you should have a perfectly
stable MAP for that condition. I think my next attempt will be with a
transducer inline, and a scope monitoring it.
On second thought, keep up the good work, so I won't have to do
any of this :-)
Rusty
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