flange with the pre-installed bolt. Manoeuvre the BOV to allow
the other two bolts to be installed. Before tightening down
ensuring the O-Rings are sitting correctly in the grooves.
Install Signal hose
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Ensure O-Ring is on supplied nipple and screw into the
cap of the BOV.
Follow the OEM signal hose to where it meets hard-line running
over the top of the engine. Remove the factory rubber vacuum
hose and replace with supplied hose using hose clamps,
Connect the other end of the hose to your new Turbosmart BOV.
Trim to length for desired fitment and use supplied cable ties to
tie the hose in place
Congratulations, your Turbosmart Kompact Series BOV is
installed and ready for use. Double check all connections and
mounting screws. Start your engine and check for leaks.
ADJUSTING YOUR BOV
The aim of the adjustment on the Dual port is to make sure that the piston is hard closed at idle and that the piston closes fast enough
to minimise backfiring and not stall the engine. In most cases, the cap is in the correct position from factory.
INSTALL THE BOV WITH THE FACTORY SETTING FIRST BEFORE PERFORMING ANY ADJUSTMENT.
Adjustment to the BOV is made by rotating the cap. To increase the spring force on the piston, rotate the cap clockwise in the direction
of hard as marked on the top of the cap. To decrease the spring force on the piston, rotate the cap anticlockwise in the direction of
soft as marked on the top of the cap - CAUTION - Do not rotate the cap beyond the O-Ring groove.
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Start with the BOV cap at the maximum soft position (The indicator O-Ring should be completely covered by the edge of the cap)
With the engine at idle the exhaust port should be closed off by the piston – the piston should be hard against the seat and not
floating or moving
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Free rev the engine and back off quickly, the engine should return to normal idle speed – if the engine drops below idle or stalls
increase the spring tension by one turn
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Repeat this process until the engine free revs and returns to normal idle speed
Test drive the car and ensure that when decelerating or changing gears that the engine has minimal backfiring and no stalling. If
backfiring is excessive or stalling is noticed then check all connections made during the installation, otherwise increase the spring
tension
TROUBLE SHOOTING
The following points should be checked if you find that your engine is dipping below normal idle, stalling or if the BOV is functioning
poorly. Please note: the following checks will cure 99% of problems experienced with a BOV.
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Check the vacuum hose for splits, cracks, loose connection, kinking or any obstruction – old or fatigued hose may collapse
under vacuum causing an obstruction.
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With the engine running remove the vacuum / boost hose from the nipple in the cap of the BOV, there should a loud hissing
sound. The engine should idle poorly, double check by covering the end of the hose with your finger – otherwise the hose is
blocked.
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Check to see if the BOV is blocked or contaminated with dirt or debris.
Ensure that the vacuum / boost source is not shared and that the vacuum source is directly from the inlet manifold.
Check the seal between the charge pipe flange and the BOV. Make sure the supplied O-Rings are installed properly and
the BOV Flange is secured on the compressor cover flange with the 3 supplied screws.
Ensure the spring clamps are secured on silicon hoses and fittings.
If the valve does not open properly or is slow to react, it could be due to the mapping of the drive by wire system from such
things as aftermarket chips and engine tunes. Check with the tuner that the mapping of the throttle is the same as OEM.
The valve may not open if the engine is just free reved. Check that the valve operates by driving the vehicle.
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