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Old 12-20-2012, 11:06 AM   #148
str8dum1
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Join Date: Dec 2011
Location: raleigh
Posts: 179
My Ride: VQ38DETT
more duty cycle puts more pressure on top of the gate keeping it closed, not open.

you get a boost spike becuase your initial duty cycle is too high, keeping the gate closed

You get boost creep from poorly designed manifolds and is hardly due to duty cycle on the gate.



Quote:
Originally Posted by Scooby24 View Post
Yeah, think of your wastegate duty cycle like injector duty cycle. Increase the IDC and you spray more fuel. Increase the Wastegate Duty Cycle and you bleed more pressure through to the wastegate which opens it faster and wider.

The boost spikes are because the duty cycle is too low and the wastegate is too slow to respond, so the boost spikes before the gate opens all the way.

You get boost creep from the gate not being open far enough and it doesn't bleed off enough exhaust gasses.

At least, that's how I understand it.
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VQ38DETT on twin 6262 with ProEFI128

Last edited by str8dum1; 12-20-2012 at 11:06 AM.
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