#Evom gm boost solenoid full#
Obviously the blocking type is more effective since it has full control of the wastegate’s pressure reference, but with that control there’s a lot more risk as the system is fail deadly. So in a blocking type, the wastegate would be open to atmosphere and the bcs would be at zero duty cycle until 7 psi, then you’d start ramping dutycycle which would start raising apparent pressure at the wastegate, so it sees its cracking pressure of 2psi right around when the manifold hits ~9 psi.
#Evom gm boost solenoid crack#
This would mean typical cracking pressure is only 2 psi! a bleed type BCS won’t be able to vent that much pressure without becoming a huge vacuum leak, so you’re leaving signal on the table as the wastegate will typically crack when manifold pressure is around 6 or 7 psi. In that case, say target is 10psi and the WG spring is set to 5 psi. I'd personally go for a blocking style, since you can prevent the wastegate from seeing any boost at all until you're are 75% of target or so, then feed it signal to smooth out the curve. Note that what ^he's talking about is for bleed-type boost control, if you set it up as blocking style, the more duty cycle the less boost. Meaning -1psi should be "add 5% duty", and -2psi should be "add 15% duty". It will also help to use a log function so the change is not linear, meaning it changes PWM duty by a smaller percent the closer you get to target. If it hits 11psi (cold day), it will reduce PWM duty til it hits target. When it's at 7.5psi, target PWM duty should be 40%. If 5psi (10% duty) and target psi is 10psi (30% duty), you'll want it set to 50% duty when it hits 5.1psi. When you make it closed loop, you'll want the inverse of the target PSI's PWM. The problem with a set PWM is boost will be greater or less depending on the weather & where you get your boost reference. The right way is to use the quickspool idea ("max boost" until you're at 2/3 your target boost), then set it to a PWM you want. The flip flop from closed to PWM will lead to boost swings. Most EMS's have a feature called "quickspool" where it keeps the valve closed to a certain psi (1/2 or 2/3 ideal boost), then it starts sending it PWM signals. Click to expand.That's a very sloppy way, and by sloppy I mean it won't work well.
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