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Old 06-13-2008, 12:22 AM   #1
b-man1
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2000 2.5 rs
white

Default Boost controller question

Hey guys, I'm turboeing my RS and decided it would be a good idea to put in a manual boost controller so that I could turn it down from time to time, making my engine last longer. I've been sitting on this huge pile of parts for a while now which gave me time to think, perhaps too much. I was planning on t-ing into the wastgate line and t-ing into that again for a boost guage. My question is:

Will opening the MBC drop boost from say 6 to 5 psi? Or take pressure off of the wast gate causing manifold pressure to actually rise instead even though the gauge would read less?

If I'm over-thinging this then let me know. Thanks!
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Old 06-13-2008, 12:50 AM   #2
wrxdrvr
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The less air going to the wastegate the higher the boost will be. As for putting the boost gauge there you will only get wastegate pressure showing not the actual boost in the intake manifold, for that you need the boost gauge T-ed into the BPV...
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Old 06-13-2008, 12:58 AM   #3
b-man1
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I see...so when people tell me that my car can only handle 5 or 6 psi, what are they talking about?
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Old 06-13-2008, 01:07 AM   #4
wrxdrvr
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I don't know, but on my wrx wastegate pressure is about 7 Psi that is the max my boost gauge showed when I hooked it up at the turbo... When I moved the gauge to the BPV it showed 13.5 Psi that was actually in the intake manifold.
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Old 06-13-2008, 01:26 AM   #5
AWDWRXLOVER
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say buh bye to your motor noob.
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Old 06-13-2008, 01:53 AM   #6
b-man1
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Thanks for the help man
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Old 06-13-2008, 05:19 AM   #7
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I'm moving this, but let me caution you...you need MORE help before you do this as you haven't researched enough. "turning down boost" is like putting a bandaid on arterial bleeding.
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Old 06-13-2008, 10:26 AM   #8
Wedge
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b-man1. Your motor (I assume is a stock EJ251) will do just fine at 6psi if you meet several guidelines.

- Upgraded fuel pump
- Get some sort of EM system that will let you adjust timing AND fuel. There are some pretty inexpensive ones out there that will allow this. Look into Emanage.
- Get it tuned properly. Meaning you should not be seeing any knock anywhere in your datalogging.
- Use the search here on Nasioc. I'm sure this has been covered before. Also, check rs25.com which is solely for GC owners.
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