Turbosmart BLOW OFF & BYPASS VALVE KITS - Supersonic for: Mazdaspeed_MPS 3, 6 and CX7 User Manual
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4)
Push the 29mm blank into the OEM plumb back hose and use the factory spring clamp to secure. Use the factory bolts to fit
the new BOV onto the intercooler pipe. Remember to install the supplied gasket in between the BOV flange and the
intercooler flange. Reinstall the vacuum/pressure source to the nipple.
5)
Replace the engine cover. Start the engine and check for leaks.
ADJUSTING YOUR BOV
Ea
ch BOV needs to be adjusted to suit the vehicle it is being mounted on. The aim of the adjustment on Vee Port’s, Supersonic’s and
Dual ports 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. Plumb back BOV’s are equipped with a spring which are designed to keep the piston open at engine idle and hence the
cap can be left in the middle position.
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 first O-Ring indicator groove.
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
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
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
MAINTENANCE
Turbosmart recommends that the following maintenance procedure is carried out at six monthly intervals or at higher intervals if the
environment is very dusty or wet. Regular maintenance will ensure that your BOV is operating at its peak performance and will extend
the working life of the product.
Remove the cap of the BOV by rotating in an anti-clockwise direction
– CAUTION, the cap is under spring force, remove with
care!
Carefully remove the piston and thoroughly clean the piston and the bore of the BOV
Inspect the surface of the piston and the bore of the BOV for scoring or excessive wear, silver coloured marks on the bore are
an indication of excessive wear
Check the Base O-ring and the Cap O-ring for any damage
– replace if necessary
Lubricate the bore and the piston with Uni-
Glide™, hydraulic oil or sewing machine oil – DO NOT use grease or viscous oils
Re-assemble the BOV in the reverse order