Just wondering if any of you experienced Greddy users have experienced this issue with your boost controller. I am having an issue to where the Gain will only tune from 5 to 35% and the Limiter will only tune from 0 to 20%. Base setting are this.

LO:
SET - 10% (Tried all the way to 0% and still hit 107)
GAIN - 5% (Low as it will go)
SET GAIN - 0 (START BOOST)
WARNING - 95 (Should be 9.5 psi)
LIMITER - 20% (High as it will go)

The PEAK keeps showing at 107 (10.7 psi) whenever it bucks and I'm guessing hitting the LIMITER setting. Now with that out of the way the weird thing is even when i turn the controller off it still hits the LIMITER. I would assume with the controller off it would read off the spring (.65 bar) in the wastegate which it is not doing. Does anyone have any ideals what could be the issue. Maybe the Valve Unit going bad or hooked up incorrectly? Below is how the Valve Unti and Wastegate is connected.

Valve Connection
CON Port - to the top port of the Wastegate
NC Port - Connected to the pressure source on the turbo housing with a T fitting in between with a connection also going to the side port on the Wastegate. If anyone has any suggestions I would really like to hear them I am at my end with this thing and am fixing to scrap it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dwilson &raquo;</TD></TR><TR><TD CLASS="quote">whenever it bucks and I'm guessing hitting the LIMITER setting </TD></TR></TABLE>

If you turn the unit off, it cannot be limiting anything so my guess is that whatever 'limiter' you are experiencing, has nothing to do with the boost controller...

 

Thats what i was thinking also. I think i am going to just scrap it and just buy a manual controller. I have been messing with this thing two long.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dwilson &raquo;</TD></TR><TR><TD CLASS="quote">Thats what i was thinking also. I think i am going to just scrap it and just buy a manual controller. I have been messing with this thing two long. </TD></TR></TABLE>

Yes, but the controller isnt your issue...fix the problem, not what isnt causing it

 

It has to be causing the issue. I can hook the turbo straight to the wastegate and bypass the controller and valve unit and the car boost perfect right to .65 bar which is spring rate. Thanks for the help by the way.

 

how is the actually unit getting it's boost referance? From the intake manifold?

also try hooking up your wastegate from the intake manifold not the compressor housing.

The limiter 20% is how much it is going to lower your boost when you hit your warning so if you have the limiter at 20% and the set at 10% your trying to make the boost controller control to -10% of maxium boost, that might be the cause of some of your problem.

also raise your warning to 10.5 because 9.5PSI is your target so when your actually hitting 9.5PSI your boost controller is then trying to lower your set by 20% cause it to freak out

then again all your settting are going to be changing if you change the referance point of the unit to the intake manifold if it's not coming form there already.

You will know when you hit the limiter setting the screen flashes red and beeps at you as well as tries to lower the boost, if your limiter is set to what your spring rate is you will have a problem

 

* how is the actually unit getting it's boost referance? From the intake manifold?

NC Port - Connected to the pressure source on the turbo housing with a T fitting in the line with a connection also going to the side port on the Wastegate.

* also try hooking up your wastegate from the intake manifold not the compressor housing

I will try this to see if there is any difference.

* The limiter 20% is how much it is going to lower your boost when you hit your warning so if you have the limiter at 20% and the set at 10% your trying to make the boost controller control to -10% of maxium boost, that might be the cause of some of your problem.

So the LIMITER setting is a % or what the SET value is? (ex. SET=100%/LIMITER=20% boost would be backed down to 80% when warning is hit). Also why would my LIMITER value only adjust from 0 to 20%(should be 0% to 100% correct?)

* also raise your warning to 10.5 because 9.5PSI is your target so when your actually hitting 9.5PSI your boost controller is then trying to lower your set by 20% cause it to freak out

I will try this.

* You will know when you hit the limiter setting the screen flashes red and beeps at you as well as tries to lower the boost, if your limiter is set to what your spring rate is you will have a problem

It does do this when reaching the LIMITER. It also does this with the power switched to off on the controller. When the controller is off you can still use it as a Boost Gauge, LIMITER, and PEAK Boost features or at least mine does.


Thanks for your help.

 

no how is the box getting it's vacuum source? the actual control box not the boost solenoid.

No the limiter can only lower the boost 1/5 of the max boost for your set up or 20%

limiter can never be more then 20% the gain can never be more then 35%

while the EBC is off you still can use the boost gauge, it will tell you when you hit the limiter but wont back off the boost, and will record your peak boost for that run.

IF your trying to run just the pressure of your spring in this case you wanted around 9.5PSI correct?

you might want to try using like a 7 PSI spring then raise the boost with your controller, it's hard for an EBC like the Profec B spec II to keep the boost around the spring level because of the way it works.

Profec B II is a great tool but you gotta fiddle with it a LOT to get it to work perfectly for ya I was always messing with mine on my Saturn.

 

To be truthful I will have to check and see where I have the box connected to. I think that it is connect to a vaccum tree I have running off of the brake booster. I have been running off of the .65 spring in the wastegate for a while. The Profec was on the car when i bought it but wasnt hooked up correctly, so i was just running on the spring. I think .65 should be around 8.5 psi. which is what my boost gauge read. I will try some of the things you said and then let you know if it worked out. One other thing i have the Valve Unit under the hood mounted upside down. Do you think that may have something to do with the issue. Again thanks for everyones help.

 

yeah get that box hooked into the intake manifold and the wastegate to the intake manifold as well

.65 bar is 9.5PSI (14.7 x .65=9.55)

whats the boost gauges pressure source(if you have one besides the one on the profec? that should be the intake manifold as well or a source passed the intercooler that also has vacuum. If your running the wastegate off the pressure port on the turbo then you would be less boost then your intended too because of the pressure drop from your intercooler and charge pipes.

IF you have a vacuum tree I would suggest getting the source vacuum for it form the intake manifold much more true of a source since that is where the pressure really matters.