fahr_side Posted July 31, 2012 Share Posted July 31, 2012 Honestly, the OTS Cobb maps aren't that great. Lots of users show knock, boost errors etc. You'll pick up some power and reliability with a proper tune. Think about remote (e-tuning) with a pro since your current stg1 map probably won't react well to the removal of that cat. Post-tune you'll see better response, power and economy. Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
dragosdor Posted July 31, 2012 Share Posted July 31, 2012 clogged cat Link to comment Share on other sites More sharing options...
ssbtech Posted August 11, 2012 Author Share Posted August 11, 2012 What's likely to get screwed up with the tune if I remove the up-pipe cat? I can't get my car to a tuner and I'd be lucky if I get the necessary 40 minutes out of my laptop's battery to do an e-tune. Link to comment Share on other sites More sharing options...
fahr_side Posted August 12, 2012 Share Posted August 12, 2012 You're going to have boost control issues, likely fuel cut from overboost. Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
ssbtech Posted August 12, 2012 Author Share Posted August 12, 2012 Crap. Thanks. Maybe I should just replace it with a new factory catted pipe. Link to comment Share on other sites More sharing options...
fahr_side Posted August 12, 2012 Share Posted August 12, 2012 Crap. Thanks. Maybe I should just replace it with a new factory catted pipe. That's the second-from-last thing I would do. Get yourself a used OEM catless up-pipe and install it. There is some chance that the stock downpipe will keep things in check and your current map's boost control tables will be able to deal with the lack of pre-turbo cat. It's for sure nothing like as dangerous as running an aftermarket downpipe on a stock tune. Run the car around for a while and take an LV / make some logs. If you are overboosting, Shamar (Infamous1) will make you an OTS map that's set-up for your hardware configuration of catless up-pipe and stock downpipe, with normal stage 1 boost levels. Better yet, get him to e-tune you and figure out a power cord for your laptop / get a new battery / borrow another laptop until you're sorted. Seriously, the catted up-pipe is in the top 10 of disastrous ideas Subaru has had and needs a good ass-kicking for. Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
iNVAR Posted August 12, 2012 Share Posted August 12, 2012 That's the second-from-last thing I would do. Get yourself a used OEM catless up-pipe and install it. *snip* What's likely to get screwed up with the tune if I remove the up-pipe cat? I can't get my car to a tuner and I'd be lucky if I get the necessary 40 minutes out of my laptop's battery to do an e-tune. You're going to have boost control issues, likely fuel cut from overboost. I think you misread, right? Catless UP should be fine without a tune. Link to comment Share on other sites More sharing options...
ssbtech Posted August 12, 2012 Author Share Posted August 12, 2012 That's why I'm a little confused - I've read that the catless UP is OK, but not to go with a catted DOWN unless I'm going for a Stage II tune. Link to comment Share on other sites More sharing options...
fahr_side Posted August 12, 2012 Share Posted August 12, 2012 Deleting the pre-turbo cat will for sure effect boost control. It may or may not lead to overboost and fuel cut. Even if it doesn't, boost control will be ugly and make the drive rather choppy. Really, it's your car. Step up, treat it right and get a proper tune. Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
iNVAR Posted August 12, 2012 Share Posted August 12, 2012 Really? Hrm.... Okay. I have absolutely no personal experience with this. Like ssbtech, I'm just going on what I read. I'll take your word for it. Link to comment Share on other sites More sharing options...
ssbtech Posted August 12, 2012 Author Share Posted August 12, 2012 Can't be any choppier than when the car was stock Hell, was the turbo surging problem ever sorted out? I always thought the cure for that was COBB stage 1. Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted August 12, 2012 Mega Users Share Posted August 12, 2012 I'll just give my personal experience. KIM this is stage 1. My boost was dead on target prior to swapping an sti up. Still dead on target afterwards, but slightly quicker spool. I also still have my stock dp, so maybe that's keeping the change in the up from having too much of an effect. Link to comment Share on other sites More sharing options...
ssbtech Posted August 12, 2012 Author Share Posted August 12, 2012 Thanks seabass07. Is your stage 1 map a COBB OTS map or a custom tune? Link to comment Share on other sites More sharing options...
ssbtech Posted August 12, 2012 Author Share Posted August 12, 2012 Do the e-tunes from infamous support the AP? EDIT: Yes, but AP V2 only Link to comment Share on other sites More sharing options...
Mega Users seabass07 Posted August 12, 2012 Mega Users Share Posted August 12, 2012 It's a custom tune. Many others have had similar results. I wouldn't expect the same results if you were stage 2 with a catted up going to a catless up, I also wouldn't even think of going wot after the change without lots of logging to make sure everything is ok. Link to comment Share on other sites More sharing options...
ssbtech Posted August 12, 2012 Author Share Posted August 12, 2012 No, I'm stage 1 COBB OTS. Link to comment Share on other sites More sharing options...
fahr_side Posted August 13, 2012 Share Posted August 13, 2012 I'll just give my personal experience. KIM this is stage 1. My boost was dead on target prior to swapping an sti up. Still dead on target afterwards, but slightly quicker spool. I also still have my stock dp, so maybe that's keeping the change in the up from having too much of an effect. Good to know, thanks. Just goes to show how restrictive that stock downpipe is. :O Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
DerekDaniel Posted August 14, 2012 Share Posted August 14, 2012 Get an e-tune that supports your AP. Cobb ots is garbage and also cause you to go crazy looking for ghost. Link to comment Share on other sites More sharing options...
ssbtech Posted August 14, 2012 Author Share Posted August 14, 2012 Any reputable tuners who can make maps for the APV1? Link to comment Share on other sites More sharing options...
DerekDaniel Posted August 14, 2012 Share Posted August 14, 2012 I am not sure about APv1.... Infamous is good...I know from current tune but it is for the newer AP; version two I think. There are other tuners PDX, Clark etc. that can tune with AP. I am not sure if they tune that version though. Maybe some one else can answer that. I think cobb had a trade in for older to newer AP at one point. They may still offer something similar. I would check around and see what the vendors say. Link to comment Share on other sites More sharing options...
ssbtech Posted August 14, 2012 Author Share Posted August 14, 2012 Isn't a map a map? Why would the AP version matter? Link to comment Share on other sites More sharing options...
DerekDaniel Posted August 14, 2012 Share Posted August 14, 2012 Isn't a map a map? Why would the AP version matter? Maybe different software, I do not know for sure. Just adding some thoughts; I would contact a vendor and see what they say.. Link to comment Share on other sites More sharing options...
SeeeeeYa Posted August 14, 2012 Share Posted August 14, 2012 AP1 has a very limited memory, which makes tuning for some setups complicated, requiring at least two components to a tune... a base map and a real time map. This is not only hard on the tuner, but also introduces issues for the person being tuned. Get rid of the V1 AP. Good luck. Link to comment Share on other sites More sharing options...
ssbtech Posted August 14, 2012 Author Share Posted August 14, 2012 Stock stage 1, that's all I want. I'm not interested in spending $600 on a new AP. Link to comment Share on other sites More sharing options...
SeeeeeYa Posted August 14, 2012 Share Posted August 14, 2012 Stock stage 1, that's all I want. I'm not interested in spending $600 on a new AP. http://www.infamousperformance.net/ Link to comment Share on other sites More sharing options...
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