200TQA boost sensing question

[LL - NY]

Go to www.sjmautotechnik.com find the link to the "Secrets of High Boost"
and you'll get
an excellent description of what's supposed to happen.

What you have is an MC2 engine, which (as I recall) is supposed to shut off
boost at
1.65 bar. You really can't get more without a: fooling the ECU, there is a
diode type
mod that will cap the signal sent to the ECU at 1.4 bar, but the engine will
boost higher.
Not for the faint of heart, or for someone without an auxiliary boost guage,
as all of the
overboost safety controls are effectively bypassed by this mod. or b: an
alternative ECU,
of which Scott Mockry (host of the aforementioned site) is one vendor of the
modded
MAC-14 required.

LL - NY



On 7/3/06, Kneale Brownson <kneale at coslink.net> wrote:
>
> I believe you have to change out the boost sensor INSIDE the ECU to get it
> to agree to greater boost than 1.7.  Your car isn't supposed to show more
> than 1.4 to the ECU, but the springs are allowing you to get to the 1.7
> which is the cutoff limit, as I understand the system.
>
>
> At 03:20 PM 7/3/2006 -0700, tmb wrote:
> >
> >hey all.
> >
> >i've been fiddling around with various devices on
> >my  late 89 200TQA to see if i can safely extract
> >a little power from the motor.
> >
> >i don't know if this info helps, but the build
> >date is feb 1989, and it's got 2 knock sensors,
> >and a MAC-14 ECU.
> >
> >anyways, i've been playing around with different
> >WG springs, and i've hit a wall.  there is
> >something in the system that is telling the ECU
> >to shut the power down at 1.7BAR.
> >
> >to help figure out exactly what is responsible
> >for shutting the fun down, i've completely
> >disconnected the boost cut-off switch.  i don't
> >recall it's proper name at the moment, but it's
> >the unit that has a number of vacuum hoses going
> >to it, notably one from the turbo.
> >
> >even tho i've disconnected this device, things
> >are still getting shut down at 1.7BAR.  why?
> >what else is sensing boost and shutting things
> >down?
> >
> >also, is it safe to say that it's the fuel pump
> >that's being turned off?  or is there something
> >else that is cutting power?
>
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