DLS

I´m looking for a closed loop EBC and so far i´ve only found the Gizzmo MS-IBC from Apexi http://www.apexi-usa.com/product_giz...=266&pageNum=1

is there any more out there?

Rogue_Ant

When you say closed loop what are you looking it to do exactly?


-Rogue

DLS

To maintain exactly the same boost whatever the weather conditions are
I think this will explain it better than me
http://www.atp.ruhr-uni-bochum.de/rt...rol/node4.html

sweanders

That's what an(y) EBC does.

DLS

hm maybe i got it wrong?
could someone then explain the difference between an open loop and a closed loop EBC?
i believed it was like this http://www.atp.ruhr-uni-bochum.de/rt...rol/node4.html and thats why i wanted a closed loop ebc.
Someone told me thats how a closed loop ebc works but maybe he was wrong

sweanders

Closed loop = acting after predefined parameters and not values, i.e. rpm and throttle position.
Open loop = continously working after real time values, i.e. a manifold pressure sensor.

Edit: Did I get it backwards, I tend to mix these two up..

DLS

yes i think you mixed them up

Rogue_Ant

Pretty much all EBCs operate in closed-loop.


-Rogue

DLS

i believed it was the other way around that most ebc:s work in open loop ? (Cheaper)
like the greddy profec b - spec 2 and the Gizzmo IBC

but more expensive ebc:s work in closed loop
like Gizzmo MS-IBC and Greddy PRofec e-01

Rogue_Ant

No - nearly all EBCs work in closed-loop. They have a MAP sensor that determines the boost pressure, and utilize this to maintain boost pressure.


-Rogue

RPG951S

Almost all EBC's are closed-loop; wouldn't make sense otherwise.
The biggest problem with EBC's is the lack of a air temperature/pressure sensor/logic to predict boost performance due to weather.

They'll all try to keep the boost in check, but take almost any controller [set to 15psi] and run it on a -20C day. You'll get monster overboost before it realizes what happens - and whatever failsafe system it has will kick in - but you won't get 15psi.
I think HKS had the ATM version EVC-IV which had this; not sure of any others.

newkie

You got it backwards... Closed loop means that you use realtime data to counteract disturbance inte the controlled value (boostpressure)....

The term closed loopp i believe comes from the loop it makes if you draw up the actual logic on a piece of paper... the line back from the detector closes the loop....

Corleone

DLS... du kan engelska...

eniac

I have had the AVC-R for a few years now. I live in Michigan where my car sees anywhere from sub 30'F to 100'F. I had huge issues trying to get a steady boost off the previous MBC, but once I switched to the AVC-R, my boost is dead on right where I set it. If I set it to 25psi in the hot summer, I still get 25psi in late November without touching it.

Since it runs of MAP pressure, doesn't this already compensate for different temperatures? If it's 30'F outside it might hit 25psi quicker however 25psi is still 25psi and sets the wastegate duty cycle accordingly.

The only times I overboosted is when I had vacuum lines split or come off the wastegate.