How does our WRX engine control BOOST??
#1
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How does our WRX engine control BOOST??
Can anyone tell me how boost is controlled in our WRX engine?
I did some search but i can not find the exact answer.
My detail questions are:
1. What is the relation between wastegate, factory EBC, T fitting, and all those little black hoses which connect compressor outlet, wastegate, intake runner and factory EBC??
I want to know how they all work together.
2. What is Soleniod Valve (factory EBC??) How does it work? and Why does it connect to both intake runner and wastegate actuator? What the T fitting is for?
If the answer is long then anyone pls post a link that I can go to to read.
I want to understand the boost controlling mechanism in our engine better before I'll do anything to my car.
Thanks in advance for your help.
I did some search but i can not find the exact answer.
My detail questions are:
1. What is the relation between wastegate, factory EBC, T fitting, and all those little black hoses which connect compressor outlet, wastegate, intake runner and factory EBC??
I want to know how they all work together.
2. What is Soleniod Valve (factory EBC??) How does it work? and Why does it connect to both intake runner and wastegate actuator? What the T fitting is for?
If the answer is long then anyone pls post a link that I can go to to read.
I want to understand the boost controlling mechanism in our engine better before I'll do anything to my car.
Thanks in advance for your help.
#2
It has an internal wastegate, the ECU controlls the boost, through monitoring it from the boost control selinoid. Located right in front of the passenger side strut tower,it's the little box located right beside the turbo where some of the lines should be running too. It through ECU signals controlls the wastegate. That's the nutshell answear.
The02-03 ECU works differently and actually better if you want to boost controll, since the new cars are throttle by wire. The old cars go into open loop mode easier from what I've heard as compared to the newer WRX's. It's something like that, other people could probably explain this better.
The02-03 ECU works differently and actually better if you want to boost controll, since the new cars are throttle by wire. The old cars go into open loop mode easier from what I've heard as compared to the newer WRX's. It's something like that, other people could probably explain this better.
#4
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WRX2ndregime-So, the solenoid controls boost by bleeding the exess pressure coming from compressor outlet right?
Cyrus-Mine is MY04 and I'm thinking about running Blitz DSBC i-d (Cool screen,but it's super expensive) or Profec B SpII (Much lower price). Which one you reccommend? Heard that Prfec is hard to use but give you steady peak boost once you master using it.
Cyrus-Mine is MY04 and I'm thinking about running Blitz DSBC i-d (Cool screen,but it's super expensive) or Profec B SpII (Much lower price). Which one you reccommend? Heard that Prfec is hard to use but give you steady peak boost once you master using it.
#5
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Location: Knoxville, Tennessee
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Car Info: 2004 WRX in WR Blue
In my 2004 I am running an Apexi AVC-R and seem to like it better then all of them. I got mine for $300 about a year and a half ago. I think out of all the companies, Apexi has the best. It gives constant boost all the way up to 7k with no hesitation and pulls strong in every gear.
my .02
my .02
#6
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AVC-R is one of my choice too, as I've heard a lot of compliments on it. My concern is it screen is too big and I don't know where to put it on. Let's say I have a center guage pod (Defi style), I dont have too much space left on the dashboard.
Where do you put yours on?
Is AVC-R hard to use?
Where do you put yours on?
Is AVC-R hard to use?
#7
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I put mine in front of the ashtray and cig lighter. I dont use a car charger for my phone (they are bad for your battery) and I dont smoke so I dont have much use for it. You can look at pics on my aol profile (screen name Cyrus923) of the avc-r there. I have also seen it mounted above the rearview mirror in place of the small flip down visor there which looks really cool. You just have to hide the wires right through the A pillar.
As far as ease of use I think it is. You just have to plug in a few things like the cylinders of the car and what not. Then you are able to adjust the boost in bar and the duty. You can change the duty in each gear then to stay in the right power curve. I run mine @16.5 psi in every gear right below cut-off. If you happen to get an AVC-R I can give you my bar and duty but it tends to be slightly different for each car, and weather conditions.
Justin
As far as ease of use I think it is. You just have to plug in a few things like the cylinders of the car and what not. Then you are able to adjust the boost in bar and the duty. You can change the duty in each gear then to stay in the right power curve. I run mine @16.5 psi in every gear right below cut-off. If you happen to get an AVC-R I can give you my bar and duty but it tends to be slightly different for each car, and weather conditions.
Justin
#8
The02-03 ECU works differently and actually better if you want to boost controll, since the new cars are throttle by wire..................sorry but that is wrong , I have an 05 wrx and it is not an throttle by wire, throttle body it is cable controlled , the STI is .
#9
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Car Info: 2016 Acura RDX ... meh. Um, nice subwoofer?
Originally Posted by Spec C Wannabe
Can anyone tell me how boost is controlled in our WRX engine?
I did some search but i can not find the exact answer.
My detail questions are:
1. What is the relation between wastegate, factory EBC, T fitting, and all those little black hoses which connect compressor outlet, wastegate, intake runner and factory EBC??
I want to know how they all work together.
I did some search but i can not find the exact answer.
My detail questions are:
1. What is the relation between wastegate, factory EBC, T fitting, and all those little black hoses which connect compressor outlet, wastegate, intake runner and factory EBC??
I want to know how they all work together.
The factory boost controller is logically stuck inbetween the boost pressures on the intake side and the wastegates input for reading boost. The factory EBC is a combo of the ECU and the BCS (boost control solenoid). The ECU uses the BCS to essentially lie to the wastegate. You might have a certain level of boost on the intake side, but the BCS doesn't let the wastegate see all the intake pressure, "information". So the wastegate responds as though there was actually less boost. So, the waste gate doesnt open (as much or at all), the exhaust doesn't bypass the hot side of the turbo as much and boost keeps rising.
2. What is Soleniod Valve (factory EBC??) How does it work? and Why does it connect to both intake runner and wastegate actuator? What the T fitting is for?
Also read: http://auto.howstuffworks.com/turbo2.htm
study all the images carefully.
jason
[edit]
p.s. I would recommend getting a Blitz Spec-R. If you are going to spend twice that $ to get an AVC-R or a Blitz SBD-iD, you might as well get a UTEC or ECUTek reflash
[/edit]
#12
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Originally Posted by mmboost
Our stock system bleeds it back into the intake. I suspect this is a way to keep the fuel system (MAF) happy. Otherwise you might end up with a rich condition similar to what happens when people run blow off valves that vent to the atmosphere.
#14
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Originally Posted by Cyrus923
UTEC.....$ 1000.00 + options
AVC_R...$ 290.00
AVC_R...$ 290.00
AVC-R = map (RPM-only) based boost control with only 17x1 granularity and open loop boost control. Analog boost display with peak hold. No timing or fuel control.
Comparing them just by price is pretty silly.
jason
#15
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Yeah we all know the Utec is better, but the reply about comparing the price was because it was stated that if you were going to spend the money on an avc-r you might as well buy a UTEC. Look in the above posts. I was simply stating that a UTEC is far more expensive and not even close to the price of the AVC-R. Not which one has more features. So when saying that the AVC-R is twice the price an a manual and you might as well spend the money for a UTEC is stupid because the UTEC is 700 bucks more.