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Noob here with some questions. (Wastegate, Blow off)

Originally Posted by Nixlimited WG -> vent to atmosphere or reroute back to exhaust post-turbo This is to prevent the sound of the WG I would think? Originally Posted by

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Old 09-12-2011, 10:02 PM   #1 (permalink)
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WG -> vent to atmosphere or reroute back to exhaust post-turbo
This is to prevent the sound of the WG I would think?

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Originally Posted by Nixlimited View Post
BOV -> vent to atmosphere or reroute back to intake post MAF (assuming BOV is post-MAF)
How would this effect overall pressure after the MAF, and engine performance?

Sorry I'm still learning. I want to make very educated decisions before I get my car so I'm ready to start when I get it. I'm a computer scientist with a math minor so I'm guessing the math part won't be overly difficult for me.

I have talked with my wife about it and I might try to reverse engineer the ECU if I get bored. Which would of course let me flash my own firmware onto it

Again thanks to everyone for answering questions and helping me. I know from experience helping new people can be a hassle.

EDIT: Also for any other noobs reading this post, I highly recommend that book I posted. It's less than 20 bucks and it has very up to date information on turbocharging. It's very noob friendly. You have to know "basically" how an engine works. If you do then the book will guide you from that. I think it's a good book even if you don't want to turbo honestly. You learn about displacement and compression and all that.

Last edited by Gauge; 09-12-2011 at 10:23 PM.
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Old 09-12-2011, 11:14 PM   #2 (permalink)
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This is to prevent the sound of the WG I would think?

How would this effect overall pressure after the MAF, and engine performance?

Sorry I'm still learning. I want to make very educated decisions before I get my car so I'm ready to start when I get it. I'm a computer scientist with a math minor so I'm guessing the math part won't be overly difficult for me.

I have talked with my wife about it and I might try to reverse engineer the ECU if I get bored. Which would of course let me flash my own firmware onto it
What is to prevent the sound of the wastegate? The wastegate doesn't really make any sound. It's just a valve. What makes a ton of noise is if you vent the wastegate to atmosphere because it's like a direct path from your engine to the outside with no muffler in-between. It's running a portion of your exhaust open which is LOUD.

I can't really answer your second question because I don't know that it makes sense.

I don't think you are going to have any luck reverse engineering the ECU so I would spend the time learning basic turbocharged engine operation instead. Luckily most of the kits out there are already well engineered so you don't really need to make any educated decisions about wastegates or BOVs.
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Old 09-13-2011, 09:29 AM   #3 (permalink)
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I can't really answer your second question because I don't know that it makes sense.

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I may have misunderstood you. When you said back to intake I thought you meant after the turbo and intercooler. Since the air is already pressurized and cooled. But you meant maybe back to before the compressor perhaps?

Am I still confused lol.
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Old 09-13-2011, 04:14 PM   #4 (permalink)
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I may have misunderstood you. When you said back to intake I thought you meant after the turbo and intercooler. Since the air is already pressurized and cooled. But you meant maybe back to before the compressor perhaps?

Am I still confused lol.
You would need to vent back to pre-turbo (unpressurized), post-maf to maintain proper metering. Because of the pressure drop through the tract and in particular after the IC, if you tried to route the BOV back to the post-turbo (i.e. pressurized) side, then the BOV may actually flow the wrong way. You need to think of everything in terms of pressures and note that high will always move to low.
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