DW400 Fuel Pressure Dropping During WOT - Whipple Stage 2

illtal

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I’m running an 18v boost a pump on the dw400. This morning i logged 45% max dc (90% actual) running 13 psi boost.

I’m mostly perplexed by the TEXAS HEAT’s 42% max dc with falling pressure. It should absolutely hit 49% if pressure is below setpoint. It’s almost as if they fat fingered the max dc in the tune.
Mike you're running 93 right? I'm close to 12 psi now but I forget in my last logs I was also running wmi which reduces my DC.

I'll check some earlier ones
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engineermike

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Not that this is much help, but this is what it's SUPPOSED to look like. I get the same big dip on the initial hit because the PID control loop needs time to react. After that, the lift pump DC modulates to hold the pressure close to setpoint.

Lift system.JPG
 
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Face

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BAP is on and it did the trick. Still don't know why BOTH DW400's had so much difficulty keeping up with a pretty mild setup but oh well...

BAP.png
 

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engineermike

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Setpoint is 73 I believe, so it overshot then falls but doesn’t drop below 73.

What does the duty cycle peak at?
 
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Face

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Setpoint is 73 I believe, so it overshot then falls but doesn’t drop below 73.

What does the duty cycle peak at?
Unfortunately this config doesn't log FPDC, but Lund seemed to be happy with it.
 

TEXAS HEAT

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Unfortunately this config doesn't log FPDC, but Lund seemed to be happy with it.
What log configuration are you using?
 

illtal

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Unfortunately this config doesn't log FPDC, but Lund seemed to be happy with it.
FPDC should be on column AQ I have Lund tune. Check it again
 

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BAP is on and it did the trick. Still don't know why BOTH DW400's had so much difficulty keeping up with a pretty mild setup but oh well...

BAP.png
Well well. It's a delivery problem. I'd start rethinking your whole lift pump setup.
 
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