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2003 ZD30 Di Patrol (The rare Gold one)
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25,771 Posts
If you just want to slow down your spool rate you could adjust the limiting screw on the turbo actuator. You could in theroy use a needle valve to do the job.
Your boost fluctuations are due to the operation of the EGR system and the ZD30 Di's poor boost control. If you want linear boost and a more responsive engine then fit a Dawes & needle valve.
 
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