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Old 04-19-2004, 02:03 PM   #1
scoobyimprza
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Default My boost controller is b0rked!

Alright, so after installing smaller injectors, putting in new vacuum hoses, fixing intercooler piping, all kinds of stuff; I took the car out to see how it would run with the new injectors and all this stuff being fixed up.

It seems as though my boost controller is not working. I have a Hallman's manual boost controller. When I would drive the car, it would hesitate pretty bad around 4000 RPMs, so I knew I was getting too much boost and the timing was all wacky. So I got out of the car and turned it down some more and it would still do the same thing. Also, the boost on the gauge was never constant or stable. It wouldn't go into vacuum either. So I unhooked the boost controller and looped the line back around to the wastegate. The car then seemed to want to go into vacuum when I gave it very little throttle, but it didn't. The car ran great then, and the boost gauge was very responsive. It would go up to about .5 bar and slowly start to increase.

So has the boost controller gone bad? Correct me if I'm wrong, but as you tighten the boost controller knob, doesn't that turn the boost up? If anyone can direct me to a good site for a homemade boost controller, that'd be great also. As always, thanks for all the help.

Brent
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Old 04-19-2004, 10:20 PM   #2
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yes when you turn it in or tighten it, it will put more pressure on the spring inside which then puts more pressure on the ball bearing.. this will keep the wastegate closed longer increasing the boost.... not to side track.. but you sound like you are having the same problem as me..

You say that at 4000 rpm you have a hesitation? do you have an a/f guage and if so does it go completely lean? I have this bazzarr hesitation at 4000 rpm under partial throttle, and my boost needle is fluttering. Did you fix your problem, and if so how?
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Old 04-19-2004, 10:28 PM   #3
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bump
cuz I have the same problem..
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Old 04-20-2004, 01:22 AM   #4
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The problem has been fixed, kind of. I disconnected the boost controller and I'm running just by the wastegate spring. It's really steady and smooth now. I don't have an a/f ratio gauge, either. I know it has to do with the boost controller, but I don't know why or how.

Brent
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Old 04-20-2004, 10:37 AM   #5
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see thats weird, because I had/have the same problem. I took off my MBC thinking that was the problem, but when I just hooked up the wastegate I still had the problem. I think today I am going to replace the vaccuum line that goes to my boost guage. If this doesn't fix it, I don't know what the hell is going on. Thanks though.. Did you say you replaced all of your vaccuum lines also?
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Old 04-20-2004, 10:40 AM   #6
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My boost controller used at 1/4" line, so I replaced those, but kept the smaller lines on at the turbo and boost gauge because they were brand new when I put them on. I'm thinking the hose I'm using is too thin and is causing leaks, so I'm gonna use some 1/4" fuel hose. It's a thicker nylon and will stand up to the pressure better.

Brent
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Old 04-21-2004, 10:06 AM   #7
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The thicker lines didn't work. I took the boost controller off of my car and I'm gonna take it apart today and probably end up replacing the spring.

Brent
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Old 04-21-2004, 10:51 AM   #8
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hey brent, so the car runs fine running just the wastegate but with the MBC is gets wacky?...have you tried another MBC?
What about you Pi7467mp ?
Take it easy, Micah
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Old 04-21-2004, 11:22 AM   #9
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The car runs fine until my boost gets to be too much for the timing of the engine. The fuel delivery is fine and my temps are good, so I'm not worried about anything. I might get another boost controller if I can't do anything with this one when I take it apart.
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Old 04-21-2004, 11:30 AM   #10
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My car runs fine. with and without the MBC, but I still have have 4000 rpm hesitation. I have no idea what is going on. I have the MBC on right now with 7psi, and it runs great. I am seriously half tempted to punch my car in the face for getting out of line I want to know why I have flutter and hesitation.
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Old 04-21-2004, 11:37 AM   #11
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is the 4k hesitation a WOT or partial?...I think you said partial...
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Old 04-21-2004, 12:14 PM   #12
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Mine would hesitate under partial and WOT, just because I was under boost.

I took the boost controller apart and it looks fine. I'm not sure what I'll do yet.

Brent
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Old 04-21-2004, 02:05 PM   #13
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I've heard that Subarus need extra fuel at 4k for some reason... with just a rrfpr, you can't tune for that... Its probably just a little lean spot. You might want to get in touch with a reputable Subaru tuner about the issue.

-Charlie
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Old 04-21-2004, 04:52 PM   #14
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I have the ability to add fuel at 4000rpm, but I was just going to wait until I put in larger injectors so I can get rid of my rrfpr. I was thinking that car is switching from open to closed loop at this point.. do you think that I should just add fuel at this point until the hesitation goes away. also has any one experienced the boost guage flutter. My needle goes crazy under boost bouncing back and fourth. Its like a 2psi flutter.. My car doesn't seem to be affected by it in anyway, I just want to know what the heck is going on.
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Old 04-21-2004, 09:25 PM   #15
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yeah for the flutter I would check vacuum lines first then go to fuel or timing
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Old 04-21-2004, 11:19 PM   #16
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ok well I replaced all of my caccum lines, and why would fuel cause the guage to flutter like that? or timing?
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Old 04-21-2004, 11:30 PM   #17
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ok so is the boost gauge acting like it is spiking up or dropping off and coming back up?....does it sound like the car is mis-firing?
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Old 04-21-2004, 11:38 PM   #18
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no nothing like that. It is a super eratic flutter.. or its shakes back and fourth super eratic klike.. it does it so bad that the needle will click.
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Old 04-21-2004, 11:43 PM   #19
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hmmm....mine was doing it to on my bad stock ECU...but then I put on the link with it's basic tune and it went away. never found out if it was timing or fuel. Do you have a EGT gauge or Wideband O2 sensor?....if so what do they do?
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Old 04-21-2004, 11:48 PM   #20
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I don't have either.. I just have a narrow band O2 sensor.. it is stoich under partial throttle, and runs rich under boost. I am assuming that fuel is fine.. I am running stock timing under partial throttle, and I am pulling timing under boost. I am only running about 6psi.. although I can't really tell cuz of the eratic readings from my boost guage.
You say you had this same problem? did you have the eratic readings from your gauge also? This is super super eratic shake.
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Old 04-21-2004, 11:54 PM   #21
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yeah my boost gauge needle was really eratic, jumping up and down, the car felt jerky though...almost sounded like it was misfiring which would be the reason for the uneven boost...don't know though...I would suggest you getting some gauges though...especially if you have engine management...have you tried anything to correct whether it be timing or fuel?
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Old 04-22-2004, 12:15 AM   #22
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I have no reason to believe it is either.. My car runs fine, just the guage is screwy.
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Old 04-22-2004, 12:20 AM   #23
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so there is no problem with the cars driving when this is going on...no sluggish feeling or jerking or anything?....ok what type of gauge do you have?...electric or mechanical?...
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Old 04-22-2004, 11:08 AM   #24
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no its not sluggish at all. I have a mechanical guage.. it is brand new.
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Old 04-22-2004, 03:14 PM   #25
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is the diaphram ok?...I think it may be wacked..either it or the gauge...
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