03 MSP will build boost but wont open external wastegate...gt28

papadock73

Member
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2003 Mazdaspeed Protege Yellow Mica
just like the description says..my car will build 4-5 pounds of boost but will not open my external wastegate..could it be a bad boost leak or something? vacuum is good but I just cant figure out whats going on. thanks!
 
14 pound spring and yes the vacuum line was installed, car actually spun a bearing a few weeks ago. trying to source a new/used imported engine and a new turbo. what turbo do you think i should buy?
 
If the wastegate has a 14lb spring then it won't open until the car sees 14psi. You should put a 7lb spring if you want it to be at stock boost. If you are replacing the motor with a stock engine the stock T25 turbo is just fine. You can't safely push more than 10-12psi with a T25 on a stock block, especially if you are on the stock ECU.
 
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