Quote: Originally Posted by grindpunk16
i actually say its half and half. that wga spring is weak. what happens if you take away the pcm control of the stock wga? you will boost no more than 4psi. go ahead and try it some time. the wga springs is weak sauce but thats why when the pcm controls boost it boosts 15 at redline.
you're absolutely right and this is already common knowledge... yeah the stock spring is very weak on it's own and would only hold 4psi if hooked directly to a boost source. I wasn't debating that one bit. What I'm debating is that some think that at very high rpm the force of the exhaust flow will be so strong as to force the wastegate open and cause the turbo to be unable to hold more than 10-11psi by redline. And I'm saying that this seems to be untrue since SEVERAL people have noted that on the stock WGA, hooked up to the stock boost control solenoid, that they have held as high as 15psi by redline.
What I think would be really interesting would be if someone could somehow COMPLETELY cut off any boost signal to the stock WGA above 5000rpm and see just how high the turbo would boost then... this would be the only true indication oh how strong the WGA spring is on it's own, as far as how much exhaust flow/pressure it takes to actually force the wastegate open. I know in my case it can hold up to 14psi by redline before the ECU turns down the fun.
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New Toy:
2007 Mazdaspeed 3 GT, red. Only mods so far: MS CAI, Cobb AccessPORT Stage 1+ MS CAI map v101, and a scraped up rear bumper, 250 whp/281 ft lbs BEFORE the AccessPORT
SRT-4 interiors are teh slow
Second toy:
2007 Civic Si coupe (wife's car), also red (Funny thing is silver is my favorite color...), also stock
