Uppipe replacement (no cats) on WRX - Subaru WRX Forum
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#1 Old 01-02-2008, 11:39 AM
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Uppipe replacement (no cats) on WRX

I have a quick question about doing an Uppipe install on my WRX (yes I searched endlessly)....

I will be doing a retune after the install, but I'd like to know beforehand whether removing the cat in my uppipe/buying an aftermarket one (say HKS) will throw a CEL? In the forums, someone claimed that the uppipe mod will throw a CEL due to the EGT recording higher temps????

Does the cat cool the exhaust? Sounds fishy........

Or, will an O2 sensor CEL come up instead? (Got a stock downpipe so never had to do any CEL fixes before). If so, I gotta clear it by reflashing the ECU?

Got a stock exhaust on my car btw (don't like that much noise).


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#2 Old 01-02-2008, 11:41 AM
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Forgot to mention. The car's an '02 WRX.
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#3 Old 01-02-2008, 11:52 AM
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Quote:
Originally Posted by Impulse View Post
I have a quick question about doing an Uppipe install on my WRX (yes I searched endlessly)....

I will be doing a retune after the install, but I'd like to know beforehand whether removing the cat in my uppipe/buying an aftermarket one (say HKS) will throw a CEL? In the forums, someone claimed that the uppipe mod will throw a CEL due to the EGT recording higher temps????

Does the cat cool the exhaust? Sounds fishy........

Or, will an O2 sensor CEL come up instead? (Got a stock downpipe so never had to do any CEL fixes before). If so, I gotta clear it by reflashing the ECU?

Got a stock exhaust on my car btw (don't like that much noise).


Yes you'll get a CEL but from eliminating the EGT sensor all together. You do not want to put this back in because the probe could break off (increased airflow) and grenade your turbo with no cat to block it. I don't believe the cat actually lowers your EGT but I'm not 100%. Most EM's will clear those CELs.

Mike
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#4 Old 01-02-2008, 12:12 PM
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you can put a resister in the plug that will satisfy the ecu I cant remember the ohm there is a diy on it
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#5 Old 01-02-2008, 12:20 PM
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2.2 kohm pretty sure. 1/2 watt would work

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#6 Old 01-25-2008, 02:08 AM
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A cats job is to conduct heat from the exhaust to become hotter than the exhaust it'self. Thats to aid in the removal of "the ozone depleting Bull S!$%" from it, and put out nice ozone friendly Corbondioxide....hahaha. Yeah you can put a resistor in, 2.2 ohm in the egt sensor plug and just plug the hole with a short like 10mm 1.25 thread pitch bolt. If you dont have an ecu tune like me, i guess it is always nice to when you put on a part that could throw a CEL to just reset your ecu so things will work in harmony....hopefully haha

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#7 Old 02-01-2008, 06:59 AM
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[QUOTE=gray;181845]you can put a resister in the plug that will satisfy the ecu I cant remember the ohm there is a diy on it[/QUOTE

resister? what is it and where can i get one?

Last edited by SUBY777; 02-01-2008 at 08:20 AM.
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#8 Old 02-01-2008, 10:00 AM
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you can get resistors from radio shack, 1\2 watt 2.2 k ohm.

the bolt to plug the hole where the egt probe came out of is not a 10mm x 1.25 its a 12mm x 1.25

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#9 Old 02-01-2008, 10:13 AM
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If you have a form of EM you can simply clear the CEL and it won't come back. I'm currently in the process of getting an internet tune by DTRacing (GetaDomTune) and he made revisions to my stock ROM based on the mods I have. Well yesterday while driving home on the highway I threw a CEL. Immediately I think but a few seconds later it comes to me that he most likely never "enabled" the Cat fixes on my map. The car is running great but I'll need to go into Enginuity today and enable those fixes, then flash that map on my car. And oh yeah the CEL I'm sure if from the complete removal of the EGT sensor, with the bung plugged with a bolt. What I'm saying is that if you have EM just get yourself the correct bolt and plug it up.

Mike
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#10 Old 02-02-2008, 11:19 PM
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does anyone have any install pics. i need a step by step install of the resister. i bought one from radio shack but im lost on the placement/install. please help.
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#11 Old 02-03-2008, 01:12 AM
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Quote:
Originally Posted by SUBY777 View Post
does anyone have any install pics. i need a step by step install of the resister. i bought one from radio shack but im lost on the placement/install. please help.
Just follow the EGT Cord from the Sensor/up-pipe to where it is plugged in...input the resistor directly into that plug (not the sensor's side) tape it up and drive..
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#12 Old 02-04-2008, 09:32 PM
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I Need A Picture Of The Resister To See Isf I Got The Right One....im Mad That I Cant Install.
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#13 Old 02-05-2008, 07:21 AM
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BEST DAMN WRX DOWNPIPE UPPIPE install cobb stage 2 - ScoobyMods
Post #5

Stop typing in initial caps

Mike
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#14 Old 02-07-2008, 03:21 PM
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Talking

your the best bro.
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#15 Old 02-09-2008, 04:17 AM
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Taken from the Perrin online instructions for their Uppipe install.....


You're taking a 2.2 kohm resistor (1 watt?) to solve the CEL.

It basically invovles unplugging the O2 sensor plug (last one underneath near where all the plugs are on the pssger side sturt tower) and sticking the resistor into the female ends of the plug.
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