Higher boost using 0% BCS DC

[JesperBlom]

Hi

I am struggling with a few issues... Have finally gotten the load and timing as I want for the given boost, and was about to find what the spring pressure boost level was.
I made a map with all 0% BCS DC, and max inc to 0%.
Logs shows 0 ish... however my boost is now at 1.4/ 20 PSI from 3000-4500... used to be 1.2 bar with BCS DC level @ around 40-57 in my normal map?
Will try to troubleshoot this during tomorrow... But any help from you guys or suggestion why - Is more than welcome.
Strange thing is that now my AFR is much better than the normal map - Did se 100% BCS DC from 5000 rpm is the old map, so guess it struggled to increase boost to level up the load?

Jesper

[mituc]

0% WGDC means that the boost from the source will go directly without any alteration to the wastegate actuator.
In bleed mode (2-port) this means the EBCS is fully closed, so no boost will be bled from the wastegate actuator (2nd barb) via the EBCS to the intake, and all of it will hit the wastegate actuator membrane.
In interrupt mode (3-port) the boost from the boost source will be not interrupted towards the wastegate actuator.
You did not share any details on your EBCS setup but from the symptoms (boost creeping at 0% WGDC, struggling to get boost at 100% WGDC) it looks like you have the EBCS lines routed incorrectly or they are not sealing.

[JesperBlom]

0% WGDC means that the boost from the source will go directly without any alteration to the wastegate actuator.
In bleed mode (2-port) this means the EBCS is fully closed, so no boost will be bled from the wastegate actuator (2nd barb) via the EBCS to the intake, and all of it will hit the wastegate actuator membrane.
In interrupt mode (3-port) the boost from the boost source will be not interrupted towards the wastegate actuator.
You did not share any details on your EBCS setup but from the symptoms (boost creeping at 0% WGDC, struggling to get boost at 100% WGDC) it looks like you have the EBCS lines routed incorrectly or they are not sealing.

Hi Mituc

Got that.
I am on OEM BCS valve, FMIC, stage 1 cct turbo, L5 short block, Corksport downpipe + race CAT, CAI, Diamond stage 1 PCV. Waiting for Gen2 valve cover, Cometic headgasket, ARP head bolts. EGR delete kit, balancer delete kit. Properly forgot something.

I have now tested some more. Boost is the "same" using 0 or 100% BCS DC. The Valve does work. Have tried directly bleeding without the hose connected to the valve., Same story. Wonder if pressure is only regulated be the wastegate opening by exhaust pressure, and that actuator is faulty. Have not yet dared to block the hose from compressor to actuator.
However - Using 0% BCS makes the car run som much better. Not jumping aroung diffent load maps, AFR almost on target. and Mass is up from max 245 to 287?
Target is 1.4 bar/ 21PSI at higher RPM - Now drops to 1.1-1.2 and roughly 340HP. My guess it that I am @ around 300 at the moment.

[mituc]

I have now tested some more. Boost is the "same" using 0 or 100% BCS DC. The Valve does work.

If the EBCS works then most likely whoever refurbished your turbo did not put something properly on the wastegate side.

Wonder if pressure is only regulated be the wastegate opening by exhaust pressure, and that actuator is faulty.

Probably the actuator/arm is jammed into a semi-open position. The boost pressure cannot be regulated by the exhaust pressure, this is some ancient method used on some old tractors with the wastegate flap held by a spring.

However - Using 0% BCS makes the car run som much better. Not jumping aroung diffent load maps, AFR almost on target. and Mass is up from max 245 to 287?
Target is 1.4 bar/ 21PSI at higher RPM - Now drops to 1.1-1.2 and roughly 340HP. My guess it that I am @ around 300 at the moment.

It depends a lot on how much timing you're using, but at 287g/s of air you're maybe around 300, maybe 310 depending on the timing and some other things. For 340bhp you need a lot more boost and airflow.
If the AFR is not stable when you have non-zero EBCS duty then you may also have a leak in that area.