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The MBC you are using is gaited or ball and spring sytle, therefore pressure to the WGA will be reduced already. Even with a giated MBC, it is not all or nothing, pressure builds and leaks through, but at a rate much lower than the stock BPC and of a bleed style MBC. SO when it does lift off, it reacts quickly. NOW, with that said, if the WGA is softer, you will just be adding another variable, so you'll probably compensate for it by turning up the MBC. I'd stay with the one new variable and use the MBC to dial the boost.
Other cars use an external WG to control boost or an uprated WGA like the one from Forge Motorsports. These are good for somethings but bad for other things. For a car within the stock limits of fuel cut, the the stock WGA is probably enough, when boost is above the 15 psi level with modified ecus, there might be problems with the stock WGA and you may experience some wastegate creep as the pressure will be too much for the WGA to handle and open prematurely. But for the stock limits raised to the peak stock fuel limits using a MBC should be sufficiant for controlling the WGA. The idea of the MBC is to raise the peak boost target quickly but have the system react quickly as well. These are the problem inherant with ball and spring style MBC's. That is where the MBC+A was born to deal with the overshoot problems. If you make the WG stiffer than you'll get more boost but also have the possibility of doing damage to the turbo by creating more backpressure as it won't be able to open enough to allow for the dump to the exhaust, if it is too weak, then you'll end up with some creep, so you would then compensate by turning up the MBC, whcih then your target might be higher than the stock allowable level and you hit a fuel cut. So it is just throwing another variable into the mix if you start playing with the WGA. The WGA needs only to be adjusted for base boost setting.
posted by 208.235.174...
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