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Old 07-17-2012, 09:04 AM   #1
GGSimpreza
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Default Late EJ20G in 99RS, boost solenoid or MBC?

I would like to have a legit boost solenoid I could plug in and not have a CEL, but I realize how simple an MBC would be to use.

Do you guys have good experience with a particular brand of either boost solenoid or MBC? I've seen the Perrin MBC, and they can usually be trusted.

Any input helps! Thanks
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Old 07-17-2012, 09:26 AM   #2
spackyscooby
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I am currently using a perrin mbc and it seems to get the job done well, if I was to change it out I would probably go with one from grimmspeed or possibly a hallman pro.
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Old 07-17-2012, 11:47 AM   #3
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Yeah I've got a lot of Mitsubishi friends who love the Hallman, and it's close to the same price of the Perrin, so I have been leaning that way. Thanks
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Old 07-18-2012, 04:26 AM   #4
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I'm using the Hallman right now.
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Old 07-18-2012, 12:31 PM   #5
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ive had the plain turbo xs one and currently use a turbo xs high performance both are great
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Old 07-22-2012, 07:19 PM   #6
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I have a hallman and the factory bcs is still plugged in with no hoses going to it, no cel.
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Old 07-23-2012, 09:34 AM   #7
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I'm gonna have CEL due to my exhaust, but I'm gonna try and take them down 1 by 1. Anybody know how to get around the CEL with no BCS? Or where I can get one that will work.
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Old 07-23-2012, 09:39 AM   #8
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Why would the exhaust give you a cel? The EJ20G isn't obd2, no 2nd O2 sensor.

You could try a resistor in place of the bcs, it should work.
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Old 07-23-2012, 10:34 PM   #9
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Quote:
Originally Posted by 69subaru360 View Post
Why would the exhaust give you a cel? The EJ20G isn't obd2, no 2nd O2 sensor.

You could try a resistor in place of the bcs, it should work.
I figured. What size resistor?
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Old 07-24-2012, 11:08 AM   #10
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You'd have to measure a bcs with a mulitimeter and get one. I'd do it for you but my meter is acting funky lately. Maybe somebody else can?
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Old 07-25-2012, 07:23 PM   #11
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I'm currently running a grimspeed MBC on my 20g and so far i have no CEL. granted the cars only run for about 5 minutes with it on, but the how to that I read said that as long as you leave the stock solenoid plugged in, weather or not boost lines are running to it, it wont throw a code.




Edit: as you can see, i simply took out the in and out lines for the solenoid and plugged them into my mbc.

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Old 07-26-2012, 03:09 PM   #12
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Hate to burst your bubble or perhaps I'm reviving your car and you're going to love me but it looks like you have your MBC hooked up incorrectly! The two horizontal lines are the ones to hook up not the bottom line. The bottom line goes to your resonator box and should be plugged off.

http://forums.jdmvip.com/How_to_Inst...Impreza-3202-t
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Old 07-26-2012, 07:49 PM   #13
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Quote:
Originally Posted by 69subaru360 View Post
You'd have to measure a bcs with a mulitimeter and get one. I'd do it for you but my meter is acting funky lately. Maybe somebody else can?
I would love if someone could do this.

Quote:
Originally Posted by Millhouse_5 View Post
as long as you leave the stock solenoid plugged in, weather or not boost lines are running to it, it wont throw a code.
I don't have the stock one, since I didn't by a JDM front clip. If I did, this thread would not exist. Trying to find a solution for CEL since I don't have it.
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Old 07-27-2012, 06:02 AM   #14
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I can look and see if I have a boost solenoid laying around. IIRC, I have a 2 port and a 3 port but I need to look since I just got back to Japan from the states. PM me if interested and we can chat.
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Old 07-27-2012, 11:38 AM   #15
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If I remember over the weekend... or maybe someone else can check this but we could take the plug off of our boost solenoids and take a multimeter and measure the resistance. That'll tell you what size resistor to use
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Old 07-31-2012, 08:52 AM   #16
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Quote:
Originally Posted by Jarrod164 View Post
If I remember over the weekend... or maybe someone else can check this but we could take the plug off of our boost solenoids and take a multimeter and measure the resistance. That'll tell you what size resistor to use

Can someone do this? Haha it would help out tremendously!
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Old 07-31-2012, 11:03 AM   #17
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I was gonna do it last night but ended up not haha. I will be under my hood tonight so I'll let you know.
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Old 08-01-2012, 09:59 AM   #18
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Quote:
Originally Posted by Jarrod164 View Post
I was gonna do it last night but ended up not haha. I will be under my hood tonight so I'll let you know.
Cool, thanks dude!
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Old 08-01-2012, 10:12 AM   #19
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21.5 ohms!
Seems like a really low number. If you look at the picture above, you can see the red and black wire sticking out of the left of the solenoid. That runs to a little black plug under that guys MBC. That's where I measured and I assume that's the plug you have just dangling there.
Good luck and let us know if that gets rid of the CEL!

I guess it should work out as the rest of us just have that hooked up. I was wondering if a different resistor size would affect the ECU. Does the ECU pick up signals from the unit or does it send signals (or both)? Just thinking about if the ECU sees boost from that solenoid but that wouldn't make sense with an MBC in the picture heh.
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Old 11-02-2012, 08:59 PM   #20
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I'm gonna do that when I get back from FL. I wonder if it has to be exactly 21.5 ohms...
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Old 11-13-2012, 11:15 PM   #21
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I put a 22 ohm resistor in, got rid of my 4500 rpm fuel cut. However, has a stutter at wide open throttle in 3rd and 4th sometimes. I'm probably maxing out my MAF right? That's what it feels like.
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