it hits 19-20 psi at peak and falls down to ~14psi at redline
I use old style Greddy profec B, tried adjusting it to keep the curve more linear, removed bov and plumbed the lines but no luck
also guys, doesn't the load seems high for given pressure ?
car is 2.3 with S2 cams and 10.5 turbo

any help is welcome


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Do a boost leak test to find out for sure.

 

don't have access to relevant tools yet and wanted to outrule other things if there could be any. boost controller itself ? its solenoid ? adjustment ?
thinking about what else could be the reason of such drop

 

Stunt,

I read somewhere in theory that you can compare MAF data to MAP data and see if there is a boost leak.

i.e.: air pressure in through the air intake should not drop off much when compared to the air that reaches the intake manifold.

You can use evo scan to get the two pressure values right?

I've also read that excessively high load values at low boost level could be a clue: e.g.: 18PSI puts up 300 load values- what those numbers are exactly I don't know, but it may be a clue that you have a boost leak- maybe someone on here will know.

 

You can create a boost leak tester easily from a couple parts from home depot. Try that first

 

tested the system. there are no leaks except one
at around 14-15 psi the actuator arm pushes out and there's sound of air coming out from somewhere at actuator area.
sound is present above given pressure. below that, as actuator closes there's no sound between 0-15 psi

is it normal or it points to leak ?

 

My guess is that you have ports switched on your boost controller.
Don't connect anything if you aren't 100% sure how to do it.
You are opening at wastegate spring pressure when leak testing.

 

I would recommend switching out the greddy boost controller for a three port electronic boost control solenoid. Either a GM 3 port or a Grimspeed 3 port.

 

Yes you could switch to ECU controlled boost and get rid of that module in your car interior.
You would get so much more options, failsafe, compatibility, etc.



......In my own opinion and this isn't to bash anyone, I do not like the look of a EBCS in the cabin. This is in some way ricy... (I understand the purpose of a EBCS)
Anyway you have the level of stealth that you want, it's your choice
For the same reason I hide my wideband gauge .....

 

actuator shouldnt leak , make sure the ebc is plumbed correctly too

 

horses for courses , depends your definition (and spelling) of ricey

 

EBC connections are 100% correct

I'll try and double check if it's truely the actuator. the sound comes from that area though

 

What you describe is like your solenoid would not stop air from flowing through WGA.
Maybe it's well connected but the solenoid valve leaks.

Unconnect it and check if the normally close port is leaking with pressure applied.

 

It may be from the 2.3L. 20psi on the 2.0L will yield about 240load. Since a 2.3L is 1.15% more volume, 240*1.15= 276 load. Which is roughly 25psi on a 2.0L with the stock turbo.

 

Yes there is in fact much higher flow in your engine... But I still think 10.5 should hit and hold more boost than that even on a 2.3 with S2. And it isnt normal for the wastegate to open on a leak test. Ix or VIII 10.5??