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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