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01-02-2013, 02:24 PM | #1 |
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Chargepipe Upgrade Worth It
For the FBO guys is upgrading the charge pipe/BOV really worth it? I don't feel like I'm losing any boost through the stock diverter valves but I do get some wierd throttle closures when I let off from 100% throttle in the midrange.
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01-02-2013, 03:09 PM | #3 |
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For the N54 guys, this statement is absolutely fine..... for us N55 owners, I would recommend that be the first upgrade. But, if you go FBO, and have the means.... might as well get a more sturdy, durable (and prettier) pipe, that makes a better swishy noise
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01-02-2013, 03:16 PM | #4 | |
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Is it flimsier on N55 ? |
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01-02-2013, 03:27 PM | #5 | |
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Yes, by far. N55 has plenty of owners who have experience "Cracks and breaks" at high boost levels. From just a simple crack causing boost leak, to some serious cases of it snapping off. A lot of N55 owners will tell you that it is the first thing you should do. But then again, N54 is different.
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01-02-2013, 03:42 PM | #6 | |
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Do you believe it necessary even if the car is stock ? |
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01-02-2013, 03:49 PM | #7 |
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01-02-2013, 04:09 PM | #8 |
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Stock, no. You're fine.
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01-02-2013, 10:19 PM | #10 |
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Sorry if this is a bit irrelevant to the whole discussion but I can't seem to find an answer anywhere. I came from a subaru and whenever you got a BOV, you needed to get tuned for it otherwise it would act quite silly.
Do you also need a tune for a BOV on our cars? Apologize if the question is dumb. Thanks!
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01-02-2013, 10:52 PM | #12 |
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I assumed so since I couldn't find any info regarding BOV and tune.
Thanks a ton for your response.
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01-02-2013, 10:55 PM | #13 | |
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01-03-2013, 01:04 AM | #15 | ||
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01-03-2013, 07:56 AM | #16 |
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I'd probably switch back to stock CP before taking it back in for warranty
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01-03-2013, 10:39 AM | #17 | |
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01-03-2013, 12:35 PM | #18 | |
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The worst part is that after the oxygen sensor detects that rich spike, the ECU try to pull fuel, and then the car goes lean. This can be bad. You shift, go rich, ECU tries to compensate, you punch the gas, car goes lean. Not good. In situations such as full throttle, part throttle, full throttle you can easily cause the engine to knock due to the lean condition at high throttle. Oxygen sensors are not fast enough to deal with this. If they were, you wouldn't need any MAF or even speed density. There's really no way to tune this out on a Subaru or N55, but people love their ridiculous noise making external dump blow off valves, so there is a falsehood spread that you are ok as long as it is tuned for so tuners can take money in to "fix" it. But there's no actual way to tune this problem out, and I'd be more than happy to have an open debate with anyone who disagrees. It's a system design flaw to dump metered air. The real fixes would be to relocate the MAF between the blow off valve and throttle (which is a huge undertaking and really only done for big turbo cars, and comes with its own host of problems), or switch to speed-density fueling like the N54, which again is not always simple. I see no circumstance where you should do this just because you want a noise making device so the car sounds cool. I highly recommend against ever using a blow off valve that dumps air out of the system on any car with a mass airflow sensor. Not even 50/50 valves that recirculate at first, but open dump on larger throttle reductions. You've just made the flaw smaller, but it is still a flaw. N54, good to go, doesn't really matter as it uses speed density fueling. Use whatever blow off valve style you want. You may want to adjust the spring on the blow off valve itself to give you the best behavior. There are pros and cons to tighter or looser release. N55, stick with a full recirculating setup where the air released from the charge pipe is routed back into the intake. I still tend to think the tune itself really doesn't have too much effect. For the record, I tuned dozens if not hundreds of Subarus for years from around 2004-2008, and was heavily involved in OpenECU, and wrote an actual speed-density patch for the 32bit Renesas CPU that is now widely used in many EJ257 turbo that are tuned using OpenECU.
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01-03-2013, 01:39 PM | #19 | |
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After reading this, I think I may stick with the BPV
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01-05-2013, 06:20 PM | #20 |
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01-05-2013, 06:38 PM | #21 |
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I'm about to get an ER next month as well. Gonna need it since I'm about to pick up a Cobb AP to fix the catless DP CEL.
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01-05-2013, 06:52 PM | #22 |
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Cobb hasn't released the Stage 2 maps for the N55, so you are going to be stuck with the CEL for downpipes as of now. Stage 2 and 2+ maps are only available for N54 equipped cars.
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