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Old 01-07-2007, 12:49 PM   #1
jknakes
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Default low boost

i just had my car reflashed using OpenECU. when we were tuning my car only read 11psi of boost. went over everything for leaks. didn't find any. last resort took a hallman pro boost controler off another car and put it in mine. car went from 11psi to about 19. so i'm guessing my boost controle solenoid is bad. should i go with a manual boost controler, find a stock one, or do the gm typhoon transfer?
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Old 01-07-2007, 12:58 PM   #2
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Quote:
Originally Posted by jknakes View Post
i just had my car reflashed using OpenECU. when we were tuning my car only read 11psi of boost. went over everything for leaks. didn't find any. last resort took a hallman pro boost controler off another car and put it in mine. car went from 11psi to about 19. so i'm guessing my boost controle solenoid is bad. should i go with a manual boost controler, find a stock one, or do the gm typhoon transfer?


wtf is that? do you mean GM BCS?

no offense but you sound fairly new to the scene. i wouldn't suggest using a MBC unless you plan on caring after setting it, and educating yourself about the OEM boost system and how a MBC would play a role in it.

IMO you should fix/replace the OEM BCS as to keep the stock ECU in control of your boost system. (when you use an MBC your ECU is no longer controlling boost).
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Old 01-07-2007, 03:01 PM   #3
jknakes
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yes i ment the gm bcs. i am fairly new, yes. i've read that once the car has been tuned that it's ok to use mbc, i've also read that mbc are never a good idea. that's what i'm trying to understand. i also know that with the gm i'ld need a retune.

will a stock bcs from an 03 work with my 02 car?

Last edited by jknakes; 01-07-2007 at 03:16 PM.
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Old 01-07-2007, 05:08 PM   #4
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from what i hear, if you can live with the obnoxious ticking, the gm bcs is a great choice. you can find some really cheap ones in the classifieds. mbc's aren't the most ideal means of controlling boost.

i don't see why the bcs from an 03 wouldnt work for an 02, but im not 100% certain. but if you ask me, might as well upgrade your bcs while you have the chance. that way it'll come into play with your future mods.

btw, if you're looking for a considerably quiter bcs than the gm, go with the prodrive or the perrin bcs.
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Old 01-07-2007, 08:31 PM   #5
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You need to research more as you really don't know poop about tuning and putting on parts willy-nilly will lead to your buying a new motor. Here's my tips:

a. Visit several tuning sites
b. Post in the engine management forum as your question is realted to it, NOT to the 2.0L forum.
c. Biggest tip: http://www.cobbforums.com/forums/showthread.php?t=31625
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Old 01-07-2007, 08:50 PM   #6
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Quote:
Originally Posted by hondaeater69 View Post
wtf is that? do you mean GM BCS?

no offense but you sound fairly new to the scene. i wouldn't suggest using a MBC unless you plan on caring after setting it, and educating yourself about the OEM boost system and how a MBC would play a role in it.

IMO you should fix/replace the OEM BCS as to keep the stock ECU in control of your boost system. (when you use an MBC your ECU is no longer controlling boost).
The GM solenoid came from the syclone and typhoons. You know, those AWD 4.3L V6 turbo monsters that eat suby's for a midnight snack.
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Old 01-07-2007, 09:57 PM   #7
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As a former Typhoon owner, the 'Phoon did lay down some serious torque but the Subie's are faster.

As far as teh GM BCS mod, the only tuning difference is the WGDC table. The values need to be almost cut in half. For instance, to reach 18 psi, you would only need a WDGC of 58 or so at 2500 RPM.

I have one on my '04 and it is awesome. Plus they are only ~$20 and a very simple install. Do a search.
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Old 01-08-2007, 10:23 AM   #8
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You need to supply way more information. What are you using to measure boost and in what gear? What was your car's peak boost before you flashed the map? What mods do you have? Did you change/add any mods at the same time as your flash? What tuning changes did you make?
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Old 01-08-2007, 10:56 AM   #9
jknakes
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my car was getting around 10 or 11 psi before it was flashed. this was a reading off my boost guage and the laptop hooked up to the car. after the flash it got 12 once. it was flashed using openecu, not posative as to what map, somewhere around a stage 2. my car has a k&n filter, perrin up/downpipe, and hks carbon ti exhaust. 3 inch all the way. after we went through and checked for leaks and didn't find any. we took a hallman pro mbc off another car and put it on mine after which my car hit around 19-20 psi no problem.
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Old 01-08-2007, 04:39 PM   #10
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11-12 psi sounds high for wastgate boost on a stock turbo car. Shouldn't it be closer to 7?
Sounds like you might want to take a look at adjusting your wastegate arm. It's either that or a leak, which you say you already looked for.
This is also assuming your WGDC's are high enough after tuning the car.
(Or possibly a missing/wrong pill. If never experienced this, but I know it lowers boost and makes it hard to hit targets.)
I do not think your stock boost controller is broken.
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Old 01-08-2007, 06:33 PM   #11
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the pill is there, changed it's direction and that didn't do anything. tightend the arm on the wastegate also no affect. and the wgdc's were maxed out. it was running low for a while before the reflash. i never really paid much attention because i don't push the car all that often.
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Old 01-08-2007, 08:03 PM   #12
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hope this help. i also had low boost problem with my sti and i looked for any leak and couldn't find any problem. so i drove my car stage 2 at 1.0 bar or little bit more than 4-5 month. last week i had lot's of time so i looked again, i took my T hose from my turbo housing with the pill and found out the hose got blistered, rubber got soft so i took out the pill and the pill came out so easy. i then use new hose to put the pill and zip tied the pill area and guess what? my pressure came back again to 16-17 psi. i think putting more pressure, heat and little bit of oil made the rubber weak. by zip tie and using new rubber it cured my low boost problem. i'm hoping to find better hose for my pill like silicone rubber.
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Old 01-08-2007, 08:17 PM   #13
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the car is designed at sea level to open the waste gate at 7.2 to 8 psi. at higher elevations it will open at higher levels because the car will try at keep the same power with the thinner air. most stock wrxs run at about 11psi.
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Old 01-08-2007, 09:14 PM   #14
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Wastegate pressure is determined by a spring in the actuator. There is no compensation or any other difference at different altitutes or atmospheric pressures.
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Old 01-08-2007, 11:11 PM   #15
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Hmm, since you hit 19 psi with the MBC, I don't think you have a leak. This in fact proved that given enough WGDC, you will hit high boost. So, unless MBCs magically seal leaks, you need to look elsewhere. The WG arm is probably not a problem because again you managed to reach high boost. So, that MBC was useful for diagnosing the problem. In fact, when you ran it, that is the only part of the system that you removed from the equation. You changed your WGDCs in the map and that had no effect. So, even though it's unlikely that the solenoid is bad, everything points to it. It's the only thing that makes sense to me.

Oh, and stock 02-05 WRXs run 13.5psi stock. 11psi is low for a stock car.
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Old 01-09-2007, 09:15 AM   #16
jknakes
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so would it be smart to go with a new stock bcs, a mbc, or i know the gm bcs is an option? i apriciate the input guys. thanks
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Old 01-09-2007, 09:28 AM   #17
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^^^ I would try replacing the stock BCS with another stock one and see if that fixes your problem. I would not do GM BCS unless you're ready to retune the car for it immediately. I recommend that you get comfortable with the stocker first before you venture into the GM BCS world. It's a great upgrade but there will be time for that later. Fix the car first and then worry about how to make it go faster.

I would not go with the MBC. If you're going to do any flashing and tuning, the MBC becomes useless and it can lead to more problems. Since you have full control over the stock ECU, there's no need for tricks anymore with the MBC. Do it right and change the map to match your setup.
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Old 01-09-2007, 11:41 AM   #18
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thanks for the help
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