So i checked over the hoses to and from the wastegate again, made some small adjustments for things that could be an issue, but the boost spiking remains.


My theory on what has happened is;
during the tune, the dirty airfilter was limiting the amount of air passing into the engine and limiting the boost the turbo could produce.
after cleaning the airfilter, the tune settings for the wastegate now arent dialed in as they should be, so im getting a boost spike.

Sound plausible?


Does anyone have a manual for a 99 wrx, that describes how to test if the MAP sensor, Wastegate solenoid etc etc are working?

Thanks, Steven.

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Long live the Classic!
MY99 - 245hp & 360Nm.......Best ET - 12.771s