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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 11-02-2007, 07:18 PM   #1
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Ebay score

So today I scored a practically brand new T5 BPC for 85 bucks total which includes the shipping. I'm very happy now. Just need to get loan paperwork in the mail, signed, and sent back so that I can get my clutch parts.



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Old 11-02-2007, 07:42 PM   #2
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Nice score! I bought mine with 500 miles on it for $50
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Old 11-02-2007, 07:53 PM   #3
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BPC? I am furthering my edumacation
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Old 11-02-2007, 08:00 PM   #4
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BPC? I am furthering my edumacation
boost pressure control...


Ooooooooooo your in OHIO FTW
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Old 11-02-2007, 08:47 PM   #5
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Okay, thats what I thought it stood for. Now what is it lol. Is it something that controls the wastegate signal pressure? Yeah Im here atleast until next august when I graduate, after that I have no idea where I will be going to.
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Old 11-02-2007, 09:06 PM   #6
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Yes your correct. The BPC is the solenoid that the ECU controls through PWM to maintain boost. It either keeps the wastegate actuator from seeing boost from the port on the compressor housing or allows it to see the boost.

In the project your about to undertake your going to want to run a vacuum line from the compressor port to the wastegate actuator port to run it in base boost. Your car's ECU being motronic for the N/A 2.3 will not have the provisions for a BPC.



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Old 11-03-2007, 04:45 AM   #7
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Hey nice one!

I scored my BPC for 25$. It was brand new! And it will never, ever FAIL!!!

I'm a [email protected]$$ what can I say... uh... I hate BPCs!
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Old 11-03-2007, 05:07 AM   #8
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Eh I've played around with the MBC but will stick to the BPC with my tuned ecu.



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Old 11-03-2007, 05:12 AM   #9
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I cannot see what's wrong an MBC+A and ECU? Why do people break their backs over these lame pieces of plastic that are SO fragile... and $$$

Seriously?? Why?
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Old 11-03-2007, 05:25 AM   #10
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Because personally I preferr that the ECU be able to pull the boost back accordingly if the DI sense knock or if I'm unable to get a full tank of 93 octane. The BPC is part of the safety control function of the ECU system and I like it doing its job. The MBC or MBC+A just cannot do that so thats why I leave it alone.



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Old 11-03-2007, 05:01 PM   #11
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I used a MBC for a few years with my Stage 3+ ECU. It worked great and gave me more mid range torque. But I'm now in the middle of an engine swap because my oil rings are blown. I still like MBCs, but I will no longer recommend them with upgraded ECUs.
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Old 11-03-2007, 06:52 PM   #12
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Do you think it contributed to the oil rings blowing or is there some other reason?
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Old 11-03-2007, 11:25 PM   #13
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Quote:
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Do you think it contributed to the oil rings blowing or is there some other reason?

I do.


You don't buy a ECU tune for tons of money so you can slap a 20 dollar home depot brass MBC with a ball-point pen spring in it.

What would you trust to run your car...a computer system with many sensors, or a ball bearing with a spring?


I would pick the ECU any day of the week.


That said, I'm running an MBC on my 1983 900. But that car hardly has an ECU.

Choose wisely.
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Old 11-04-2007, 04:51 AM   #14
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Can you return it if it dosent work? I hear they can be bad even when new.
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Old 11-04-2007, 07:00 AM   #15
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Can you return it if it dosent work? I hear they can be bad even when new.
PayPal buyer protection baby. If the part is faulty when I recieve it then I'm able to get my funds back in full.



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Old 11-04-2007, 07:29 AM   #16
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85 bucks? shit. that seems expensive
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Old 11-04-2007, 07:32 AM   #17
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85 bucks? shit. that seems expensive
Not for a practically new BPC. He bought it new from Eeuro so 250 which means I got it for a depreciated value of 66%. I'm perfectly content on that kind of a deal versus say 50 to 60 (don't know the price they charge) for a unknown age bpc from goldwing, elite, or any other salvage yard.



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Old 11-04-2007, 07:43 AM   #18
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I do.


You don't buy a ECU tune for tons of money so you can slap a 20 dollar home depot brass MBC with a ball-point pen spring in it.

What would you trust to run your car...a computer system with many sensors, or a ball bearing with a spring?

To pay devil's advocate...

The Fuel and ignition parts of the ECU can still monitor everything and adjust for the boost the a MBC allows as long as the MBC is not set to exceed the amount of pressure than the would allow for if using a BPC valve.

Here's my question...why has nobody found a way to modify a different sort of valve, or modify the T5 signal to support a different sort of valve?
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Old 11-04-2007, 07:47 AM   #19
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Do you think it contributed to the oil rings blowing or is there some other reason?
I used an electric valve and could to switch between MBC and ECU while driving. I probably ran my ECU 98% of the time, and switched to the MBC for a little extra boost when needed. I ran that setup for 3 years and it worked great. Finally blew a headgasket and overheated the engine a bit. Fixed the headgasket and the engine runs good, but goes through oil. I'm now in the middle of an engine swap to 2.3L
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Old 11-05-2007, 11:45 AM   #20
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Your engine issues are probably more due to a tired engine than running an mbc. As long as you're running good high octane gas and no more boost than the ecu is setup for it should be fine. I too have been running an mbc on my 9-3 for like two years with no related issues. I do find it odd that you went through so many head gaskets though.Do you think this was just from running a lot of boost? Any signs of detonation when the engine was torn down?
BPC's suck and i refuse to pay $200 a pop when a $20 part that will never fail again will do the job. It's worth the risk in my opinion.
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