Saab 9000 Service Manual page 311

308 Adjustment/replacement of components
Checking basic boost pressure
1
3
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1 Position the boost pressure gauge (83 93 514)
vertically to reduce the likelihood of instrument er-
ror.
2 Run th~ hose through the aperture in the front
door pillar and into the engine bay. Connect it to
a hose in the intake manifold.
3 With 3rd gear engaged (or gear position 3 on cars
with automatic transmission) and engine speed
below 1500 rpm, accelerate at wide open throttle.
When engine speed approaches 2500 rpm, apply
the brakes while keeping the accelerator fully de-
pressed so that maximum engine load is-obtained
at 2500 rpm.
Read off the basic boost pressure on the pressure
gauge.
The correct boost pressure is 0.40 ± 0.03 bar.
4 If basic boost pressure is outside the permissible
limits, continue as described in "Adjustment of ba-
sic boost pressure".
5 Remove the boost pressure gauge.
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6 Perform adaptation, see page 311.
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Basic boost pressure is the point of departure for
the Trionic system's pressure regulating function
and must therefore be adjusted to the correct level.
Continuous compensation of the maximum boost
pressure in relation to the current basic boost pres-
sure takes place through the system's adaptive
function.
Increasing basic boost pressure above the specifi-
ed level will not result in a higher boost pressure, as
the adaptive function will then adjust maximum bo-
ost pressure down to the nominal level (negative
adaptation).
See "Technical data" for turbo pressure.
Saab 9000