ecu mods--elec. boost controllers

[Todd Phenneger]

How did you modify the Mac-07 and why did you do it.  are you
happy with the results?
thanks
  Todd

--- Pat Korach <tm2 at zipcon.net> wrote:
> Ameer
> 
>   I have modified the Mac-7 to use in my 89 200 TQ and it
> worked fine.
>  I would think you could modify the Mac-11 to use with the KH
> engine.
> Therefore you would have a chipped KH engine.
> 
> Pat Korach
> Kirkland, WA
> 
> Ameer Antar wrote:
> 
> > there's a lot of ecu mod talk. Mostly about cheap and dirty
> ways, not
> > replacing the chip. Well, I've been thinking about it, b/c
> the ECU for the
> > KH engine does not have a programmable chip, so a hack is
> the only option
> > other than ECU/harness transplant. If the ecu is designed
> for 1.4 bar, I
> > was thinking of regulating the boost pressure to the ecu. I
> want to be able
> > to get .8 bar or so, but I don't want to change the way the
> engine operates
> > below 1.4 bar. The other resistor or aquarium valve mods
> change the
> > apparent pressure throughout the range. However, if you
> could
> > electronically control a ecu leak valve, you could tell it
> to seal shut
> > until 1.4 bar, then gradually divert excess boost beyond
> that point, until
> > it reaches some set limit. The circuit would probably be
> just need a couple
> > pressure sensors and an op-amp or 2. The only thing is
> finding a cheap air
> > valve that can be controlled by an electric signal.
> >
> > To limit the boost pressure sent to the ecu, you could make
> the valve open
> > slightly and adjust its position just as an aquarium valve,
> but by sending
> > it a voltage. Or you could do it by opening and closing the
> valve at
> > different duty cycles to achieve the right amount. The
> problem w/ this is
> > the valve would prolly have to move very fast. The problem
> w/ the first
> > method, is that I've never seen a solenoid valve which had
> variable
> > opening...ie. it's either open or closed. I was thinking of
> using an old
> > wastegate freq. valve, but I'm not sure how if it'd work,
> and my car
> > doesn't even have one. How so those boost controllers like
> GRreddy or Apex
> > products work? Do they use a variable valve or do they use a
> duty cycle on
> > the valve? Wonder if the valve can be bought separately...I
> guess I could
> > just buy a boost controller and replace the wg spring, but
> I'd rather come
> > up w/ something myself if they're like $200. I've asked
> lot's of questions
> > so I really appreciate any info you can send me.
> >
> > -ameer
> > '84 5kT
> 
> 
> 


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