Cat-back and uppipe tune please help - Subaru WRX Forum
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#1 Old 10-09-2009, 03:25 PM
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Cat-back and uppipe tune please help

Ok im new to subaru tuning but not new to tuning I have searched and nothing seems to answer my question.

If i install a catless uppipe and a catback exhaust(prob borla hush) will i have to tune the car to save from doing damage to the engine or causing trouble with the egt system?

And also installing a catless uppipe will it cause a cel?
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#2 Old 10-09-2009, 03:44 PM
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No tuning required. The CBE is mostly sound for the 02-07 models of WRX. And the uppipe is mostly a safety thing over performance also. If you search on here there is a way to disable the CEL when changing to a catless uppipe.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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#3 Old 10-09-2009, 05:45 PM
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You'll more than likely throw a PO546 CEL code(exhaust gas temperature sensor circuit malfunction) You'll need a 2.2 kohm 1/2 watt resistor from Radio Shack. You put it in your egt sensor which is the bottom connector just in front of your passenger side strut tower. Just put one end of the resistor into each hole.

Also, it is recommended that you replace your egt sensor with a M12x1.25 bolt to prevent the sensor from burning up and going into your turbo later down the road.
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#4 Old 10-09-2009, 10:21 PM
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ok so if i put the resisitor in it will disable the EGT system? There for eliminating the lean cyclinder 3 problem?
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#5 Old 10-10-2009, 02:08 AM
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The resistor just prevents the CEL from coming on. It tricks the ecu into thinking the egt sensor is hooked up and working in its normal range.

What are you asking about a lean condition in cylinder #3? The resistor will not fix that.
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#6 Old 10-11-2009, 12:59 AM
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Ok so I put the resistor in and no cel but what if i use a cobb stage one would it take the code away without the resistor?

And as far as lean cyclinder 3 ive been reading that doing certain exhaust mods causes the egr system to run cyclinder 3 lean is this true or false like i said im new to subbies
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#7 Old 10-13-2009, 06:32 PM
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subscribed i am doing the same thing and need help
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#8 Old 10-13-2009, 07:29 PM
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On that note, I just ordered a full turboback for my 02 rex, I know its better if you tune it, but how will it do without a tune? What is an easy way to tune for a stage 2?(I don't want to drop 695 on a cobb access port) Anyone got one they want to sell?
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#9 Old 10-13-2009, 08:25 PM
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Look into opensource. Google it or search on here. You just need a tatrix cable and either your laptop or someont hat has one, and some software to download maps that are either free or pay for some that companies make.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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#10 Old 10-15-2009, 12:48 AM
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thank you guys for all your information im am trying to learn as much as i can

Ok these are the only two mods i plan on doing mainly for reliability about the uppipe the catback is for my ear pleasure.

Is there any other replacements that should be done for reliability maybe removing components or bypassing anything to keep me from have issues down the road.

And what type of oil is recomended I ussually use castrol GTX 10-40 or would i need something like mobile 1 syn.

and timing belt recomendations anyone?

Here is what i have incase it makes a diff
2002 impreza wrx EJ20
With 4EAT automatic
curently no mods at all
88k miles ATM

Last edited by tjstamp; 10-15-2009 at 12:49 AM. Reason: to subscribe to post
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#11 Old 10-15-2009, 01:47 AM
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Quote:
Originally Posted by tjstamp View Post
And what type of oil is recomended I ussually use castrol GTX 10-40 or would i need something like mobile 1 syn.
Oil FAQ: Read if you want more information on oil, oil filters, and oil changes! - NASIOC

and timing belt recomendations anyone?
Maintenance FAQ: Read if you have any maintenance questions - NASIOC
.....
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#12 Old 10-15-2009, 11:26 AM
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You can get a used Cobb AP for around $400-$450 on ebay...that's what I did...and I use Mobil 1 5W-30 Synthetic oil...
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#13 Old 10-15-2009, 03:28 PM
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Quote:
Originally Posted by Kramericaa View Post
On that note, I just ordered a full turboback for my 02 rex, I know its better if you tune it, but how will it do without a tune? What is an easy way to tune for a stage 2?(I don't want to drop 695 on a cobb access port) Anyone got one they want to sell?
dont run w/o tune if u go turbo-back. i went for like 7-8 months without tune and it was runnin so rich. everyone smelled it wen they got in my car, evn people that dont no crap about cars. it went, had more power but it just didnt feel rite. some guy gave me a base map to run for like a hundred bux and wow, a lot nicer, quicker, everything was better.

a lot of members say u cant run noncatted pipes without tune, u could but its just not safe. anything could go wrong, blown piston, blown gaskets. i guess i just got lucky nothin happend(knock on wood)
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#14 Old 10-15-2009, 04:39 PM
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The DP and tune is more specific to the 04 and up, and the catless is even more of a problem on the 06 and up WRX. I was running the Castrol SYN 10w30 till this last one. I got the Mobil 1 SYN instead, idk if its in my head, but I swear there is a difference, so I will strart oil shopping earlier to get my oil before the day its needed. Just my .02cents

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Stage 2 2005 WRX
Cobbtuning.com"
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#15 Old 10-15-2009, 11:49 PM
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How's the mobil 1 working?^ I have heard of bad oil burning problems with that oil?
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