Loosing boost aftet going over 4500 rpm
 

hi guys,
i'm having boost issue. when i shift to next gear up, it makes "shooong" sound after going over 4500rpm, this happends when it's transition (normal boost 14-8-14, PFC) shifting next gear it shows only 5 on boost gauge, if i let go the gas padle it goes back to normal boost.

fowllowings are what i checked: check valves, press chamber, vacum chamber (checked if full of oil, none), replaced uper turbo control solenoid valve, replaced lower turbo control solenoid valve, replaced turbo precontrol solenoid valve, westegate control solenoid valve, actuator wastegate control, acturator turbo precontrol, actuator turbo control, and i'm still having same issue.
the primary turbo fan seems no free play, but secondary turbo seems it has free play, meaning if i spin it with my index finger it spens well, but primary fan seems turn slightly harder.


my mods are; dp, mp, cb, dual intake, fuel pump, and gredy pulleys.

please help,

thank you

Please don't post a new thread, just bump your old one back up to the top:

https://www.rx7club.com/showthread.p...hreadid=264774