This in turn controls when the wastegate opens and thus boost pressure.īy pinching that line off you have removed controlled manipulation of the wastegate, now the only thing that allows the wastegate to open is exhaust flow overcoming spring pressure and forcing the wastegate open. The computer operates a pulse width modulated solenoid that either applies positive or negative pressure to the wastegate actuator. That reference line is plumbed into a vacuum and a boost source. I'm suprised your car hasn't gone into limp mode yet. As a former technician I expect a high probability I will hit that goal with many miles to spare. Personally I'm expecting my quite modded and aggressively tuned sonic to last more than 150k miles with nothing more than routine maintenance and non abusive driving. Just my thoughts, choose as you may, I'm just giving my opinion as food for thought. Mind you that's specific dyno tuning, even being conservative, it is more aggressive and exacting then a plug in programmer could be that lacks dyno tuning or datalogging. That's basically what you're doing without changing the boost tables on the 1.4t if I take bullydog as they state it (from experience, that's with bigger, sloppier factory calibrated engines too). A live dyno tune is only good for ~10hp & tq on an NA engine, alil more with premium fuel. I won't lie I'm skeptical of any gains from a tuner that doesn't change boost at all. OP- I would not be suprised if your target numbers could be achieved on 87 oct with trifecta or VTuners. Both of whom can tune to a target limit if you request it.
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