catless TBE on 07

shyster505 · 06-13-2007, 05:07 PM

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...

wrxgtr · 06-13-2007, 05:29 PM

EM will take care of the boost spike and any cels more than likely

shyster505 · 06-13-2007, 06:11 PM

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...

ArmyWRX · 06-13-2007, 06:21 PM

go opensource

shyster505 · 06-13-2007, 06:24 PM

by open sourse do you mean piggy back?

shyster505 · 06-13-2007, 06:45 PM

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?

WRX06TR · 06-13-2007, 10:09 PM

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.

shyster505 · 06-13-2007, 11:34 PM

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?

kh15 · 06-14-2007, 01:12 AM

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

WRX06TR · 06-14-2007, 06:21 AM

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.

shyster505 · 06-14-2007, 12:08 PM

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?

mosc · 06-15-2007, 11:29 AM

Quote:

Originally Posted by shyster505

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

shyster505 · 06-15-2007, 01:35 PM

Thats what I wanted to hear...