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Re: TQC boost problem?




Mike/George,

>From Mike,
>     Electrosonic components offer a range of solid state pressure sensors
>     for  about $150 (Canadian) they are:-
>
>     Part No    Measurement     Pressure Range  Full Scale Output
>
>     142PC05D   Differential    0-5 psi         5V
>     142PC05G   Gage            0-5 psi         5V
>     142PC15G   Gage            0-15psi         5V
>     142PC15G   Vacuum (Gage)   0-15psi         5V
>     142PC30A   Absolute        0-30psi         5V

Motorola also makes a bunch of pressure sensors. These are detailed
in the Pressure Sensor Device Data book. No idea on prices.

>     op-amp to get the same response as the factory sensor.  If some one 
has
>     the response of the stock pressure sensor output voltage versus inlet
>     pressure please post it.

>From a note I sent last September,

I have finally found my notes from 3 years ago when we
characterized the TQC pressure sensor output voltages.
We wired up a DVM to the ECU and 3 of us went for a ride.
The driver watched the boost gauge, co-pilot watched the
DVM and back seat recorded the data. We recorded  a
couple of readings for each pressure step. The car was
an 83 TQC with adjustable boost regulator and stock
MAC-02 V1 ECU.

Pressure      Voltage
(psi)
 -18 inHg        0.005
 -12 inHg        .18-.2
0                      1.2   1.3
1                       1.5  1.52
2                       1.78  1.75  1.67
3                       1.9  1.88
4                       2.15  2.15
5                      2.38  2.33  2.26  2.3
6                      2.6  2.5
7                      2.7  2.68  2.75
8                      2.9  2.91  3.0  2.87
9                      3.12  3.05
10                    3.25
11                    3.56  3.45
12                    3.7  3.65
13                    3.9
13.5                4.0  3.97  3.9  3.87

>From Peter Wales,
>The boost pressure sensor gives out 0-5v and should be about 2.25v with the 

>engine not running.

My data is a bit different. This might be one of the differences between the
euro and US cars. Has anyone mapped out the boost/voltage curve
for a euro ur-q with on of the MAC-01 ECUs?

As for a replacement ECU, give Kim Collins (01444 451542 / 0374 171849) or
Adam Marsdan (01460 63851) a call. Both these guys are in the UK and
part out ur-qs and should have used ECUs available.

Hope this helps.
 -
Dave Lawson  dlawson@ball.com