catless TBE on 07 - Subaru WRX Forum
 
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#1 Old 06-13-2007, 04:07 PM
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catless TBE on 07

Hey guys. I hate to ask this question, but Ive been searching for two days and cant find a defanate answer. I have an 07 wagon and I was given a Invidia catless DP, and was going to buy the Invidia N1 race cat back. My question is, will I have to port my wastgate as well as adding a EM to my car to stop boost spike and the CEL's, or will EM be enough? Again Im sorry for making you guys answer this question again...
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#2 Old 06-13-2007, 04:29 PM
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EM will take care of the boost spike and any cels more than likely

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#3 Old 06-13-2007, 05:11 PM
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Cool thanks for the info... now just need to save some $$$ for the Cobb AP. Sucks looking at the down pipe just sitting in the garage...
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#4 Old 06-13-2007, 05:21 PM
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go opensource
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#5 Old 06-13-2007, 05:24 PM
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by open sourse do you mean piggy back?
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#6 Old 06-13-2007, 05:45 PM
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Never mind I did a search for it, but still dont know the benefits of it. Is it cost only or is there other benefits?
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#7 Old 06-13-2007, 09:09 PM
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Car will still boost creep. EM wont fix boost creep. Dont bother porting the stock turbo. High Flow cat downpipe is one way to lessen creep.
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#8 Old 06-13-2007, 10:34 PM
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Should I avoid the invidia race exahust and go with the regular since it has a resonator in the mid pipe that will restrict the flow a bit more, or is the problem at the cat in the down pipe?
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#9 Old 06-14-2007, 12:12 AM
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im going with a catted DP just for that tiny bit of back pressure but my tuner assured me that it wont be a problem with a custom tune using uniChip but then again im just getting a very safe stage 2 93 octane tune
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#10 Old 06-14-2007, 05:21 AM
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The problem is that the 2.5l flows too much air for the tiny TD04 turbo. Therefore, when the wastegate is open all the way to bypass air around the compressor wheel it is not a large enough opening to cope with the greater airflow that an aftermarket downpipe will create. This leads to too much air flowing around the compressor wheel and overboosting.

Pick up the June issue of SubieSport and read the boost section where they refer to wastegate actuators and the basics of boost. Also check out Unabombers Manifesto on NASIOC, I believe there are several diagrams in the thread to help explain. Try to do as much research as possible.
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#11 Old 06-14-2007, 11:08 AM
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Thanks for the feed back guys, I guess its back to the books for me. Any coments on the Invidia race vs. regular CBE in combonation with the catted DP?
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#12 Old 06-15-2007, 10:29 AM
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Quote:
Originally Posted by shyster505 View Post
Thanks for the feed back guys, I guess its back to the books for me. Any coments on the Invidia race vs. regular CBE in combonation with the catted DP?
get whatever cat back you like. The mod is only for sound

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#13 Old 06-15-2007, 12:35 PM
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Thats what I wanted to hear...
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