IAC

Tom Cloud cloud at peaches.ph.utexas.edu
Wed Dec 10 21:01:58 GMT 1997


>Tom, I don't think that your projection uses a MAP sensor, but i know
>that the digital ones do (i have a digital one), but the digital ones
>also use an IAC.  The fast-idle solenoid on your throttle does not work
>well?  It is a sorta cheesy setup, isn't it?  Maybe you could make a
>little plate that would go under the throttle body that has a fixed
>venturi sorta thing and has constant fuel pressure on it.  Hmmm.... 
>then you flip a switch and instant gas and air mixture to boost the
>speed a bit!  maybe an old fuel injector with a 555 timer using a fixed
>rate could supply the fuel, and you could have that IAC motor mounted on
>the other side of the plate to allow the extra air into the intake....
>hmmm....  You only need to know the basic skills of any handiman-and a
>machinist, electronic engineer, and an automotive engineer!  Just some
>brainstorming.  It really not a bad idea!  and yes, i swear, i just
>thought it up!  LOL!  Good luck on your project!  Let me know how it
>goes if you do anything

best fix for the ProJection is to either figure out how to make the
GM controller work with it or (I'd prefer) install ford efi intake,
injectors, runners, etc and eec controller (then *only* have to know
how to make it work)  ;-)

as far as making the mix richer for choke, that's relatively simple
(I think) ... the same circuit that reads the temp and controls
the makeshift IAC would also bleed a little joltage into a summing
amp along with the TPS signal -- voila'  .....  richer mix   8^)

and, whilst we're talking map, the analog projection has an hego
feedback option -- which I've not done (can't see spending > $100)
for a box that (apparently) only feeds a summing joltage in like
I propose above.  Also, I don't see how that's gonna solve anything
(after, I *want* rich some of the time).

now  ....  MAP  ....  I know the most rudimentary principles of it's
app (lower man pressure = more gas), but it seems to me that's another
bag'a worms -- probably not a linear thing where I could just take
the map signal and sum it with the tps signal (or replace the tps
signal altogether) ... if so, seems holley would'a done that.

anyone with some (simple) words of advice for this incurable tinkerer ??


 




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