Relief Valve Setup
WARNING: This procedure requires the use of an after-market boost gauge. If one is not available it is recommended that the fuel cut defenser, if you have one, be removed or disabled so that the ECU can control over boost accordingly. Failure to take adequate care during the adjustment phase could result in serious engine damage. Please also read the other sections in this document particularly the “Cautionary note” disclaimer at the beginning of these instructions aswell as the section on “How do I know if I have hit the factory bost limit ?” for advice on the effects of the factory boost limit.
THESE INSTRUCTIONS ASSUME THE VSV HAS BEEN DISCONNECTED. IF THE VSV IS CONNECTED DURING THE ADJUSTMENT PROCEDURE ENSURE THE VSV IS OPERATING NORMALLY AND BE AWARE THAT THE ECU CAN INDISCRIMINANTLY REDUCE BOOST BY AROUND 4PSI. IF THE ECU DOES THIS DURING ADJUSTMENT BE CAREFUL NOT TO OVER COMPENSATE OTHERWISE OVER-BOOST WILL OCCURR WHEN THE ECU RESTORES FULL BOOST – YOU HAVE BEEN ADVISED.
NOTE: These adjustments can be performed with the pipes connected to the relief valve providing the hose clips are not too tight – simply twist/rotate the knurled end of the relief valve inside the pipe as required.
to a suitable straight road or dual carriageway where the car can be accelerated
with no danger to you or other road users.
the valve by 1 full turn or ½ turn for a smaller increase.
the valve ½ a turn or 1 full turn for a larger reduction.
Pull the car over to the side of the road.
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