Re: Fuel Enrichment Device

[brett@kodak.com (Brett VanSprewenburg)]

> > 
> > 
> > You win the prize!  You've correctly described how the TT device works.  Now
> > two questions need to be answered:
> > 
> > 1. What's the resistance value for to drive correct fuel/air ratio at WOT?
> > 2. Under what circumstances does the OX drive the control pressure regulator
> > into a 40 second enrichment condition?
> > 
> > I'm going to answer both of those questions.
> > 
> > As for testing it...if you run the Bentley manual tests on your control systems,
> > sensors, and stock enrichment devices, then you test your additions...and
> > everything checks out, how could it not work? :-)
> > 
> > I'll keep you posted.
> > 
> 
> :).  Well, there is only one way I can think of to get the resistance
> value,
> find somebody that has a TT moudle, unplug it, and test the resistance 
> when it is activated, this would be the easy way of course, and I am
> sure
> there is another way.

Yup!

> 
> Hmmm, I think I would have to answer when the coolent temp changes for
> number 2, what do ya think?
> 
> Heres an idea,  we know what the signale to the DPR needs to be 20.5mA,
> which is 13:1. So you could put a meter on the DPR and hook a fairly
> big pot in place of the temp sensor, you could then get a ballpark
> value and tweek it with fixed resistors,  This is another hack way
> to do it.  

Bing! Bing! Bing!

Right on the ball mister, again.  This is exactly what I'm going to do.  I can
even tell you the range you'll probably need, if I remember correctly it was
from 1k-6k ohms.  Somewhere in that range will produce the correct mA current
to flow to the control pressure regulator, which is as you know 20.5 mA (the
BEST piece of info from the EC article), which should induce the correct fuel
to air ratio.  You also correctly deduced that the correct ratio is not 14.7:1,
it's slightly below, 13:1 is probably right on the money.

> 
> I may just have to take a ride to the local electroincs supply (I can
> get one of those nifty cases a radio shack) and try this out.

You'll have to push me out of the way at the parts counter!  :-)

> 
> Etrik

If I can find 1 pot, I'll get a couple and try and cover the range that way.
Have you looked at the resistance vs temperature graphs in the Bentley?

==Brett
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