Hi Flow Cat
Hi Flow Cat
Just installed a Hi Flow Cat pipe (TurboXS) and I am getting a 'Service Engine Soon' light and what I think is a cat efficiency code (P2096?).
I have installed hi flow cats in other cars and never seen this - any insight as to whether it's an issue with the TurboXS pipe or more systematic with the EVO X?
Thanks!!
I have installed hi flow cats in other cars and never seen this - any insight as to whether it's an issue with the TurboXS pipe or more systematic with the EVO X?
Thanks!!
Evolved Member
Joined: Jun 2014
Posts: 899
Likes: 40
From: Chicago
I cannot tune the car as I have an extended warranty, mainly for the SST. On that note, a MAF based ECU will easily adapt to a better flowing exhaust, assuming time delay for combustion pulse to first O2 sensor is the same (which it would be very close with stock O2 housing/downpipe).
Regarding the rear O2 spacer, there is no way it should be needed IF the cat actually works. All the rear sensor does is measure a delta between it and the front O2 sensor. Unlike the front sensor which has a range of 'acceptable' readings, the rear reading is only compared to the front to determine efficiency of the cat. It's kinda humorous to read that a 'high end' cat has the spacer built in - makes me think they sold someone a 'test pipe' with a bulge in it and charged them extra for the cat. I have used spacers (spark plug non-fowlers that you can buy at autozone for $5) on everything from BMWs to Fords to 'fool' the rear O2 sensor (we also made different sized orifices on the spacers 15 yrs ago, long before anyone thought to sell them) on systems without cats, but if the cat does actually work it should not need a spacer. There are hundreds of high flow cats out there that EASILY reduce O2 readings enough to prevent MILs and do not restrict flow - putting the spacer in there simply tells the buyer they are not getting what they paid for.
I guess I'll log the O2 data with Evoscan and see what's happening - the point of my post was to see if this is unique to the TurboXS pipe (i.e. their 'cat' is not working and I was suckered), or if it's a systemic issue (i.e. the stock Evo X cat efficiency range is so tight that many have issues with different brands). As an example, with BMW E46 M3's, the stock programming was way too tight for cat efficiency and many totally stock cars threw MILs long before the cats were bad, causing many warranty claims. BMW quickly recalled the cars for a reflash to 'fix' this, and 'suddenly' the factory cats would last for years longer. Also made it much easier to use test pipes (with a non fowler) or aftermarket high flow cats.
Regarding the rear O2 spacer, there is no way it should be needed IF the cat actually works. All the rear sensor does is measure a delta between it and the front O2 sensor. Unlike the front sensor which has a range of 'acceptable' readings, the rear reading is only compared to the front to determine efficiency of the cat. It's kinda humorous to read that a 'high end' cat has the spacer built in - makes me think they sold someone a 'test pipe' with a bulge in it and charged them extra for the cat. I have used spacers (spark plug non-fowlers that you can buy at autozone for $5) on everything from BMWs to Fords to 'fool' the rear O2 sensor (we also made different sized orifices on the spacers 15 yrs ago, long before anyone thought to sell them) on systems without cats, but if the cat does actually work it should not need a spacer. There are hundreds of high flow cats out there that EASILY reduce O2 readings enough to prevent MILs and do not restrict flow - putting the spacer in there simply tells the buyer they are not getting what they paid for.
I guess I'll log the O2 data with Evoscan and see what's happening - the point of my post was to see if this is unique to the TurboXS pipe (i.e. their 'cat' is not working and I was suckered), or if it's a systemic issue (i.e. the stock Evo X cat efficiency range is so tight that many have issues with different brands). As an example, with BMW E46 M3's, the stock programming was way too tight for cat efficiency and many totally stock cars threw MILs long before the cats were bad, causing many warranty claims. BMW quickly recalled the cars for a reflash to 'fix' this, and 'suddenly' the factory cats would last for years longer. Also made it much easier to use test pipes (with a non fowler) or aftermarket high flow cats.
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Evolved Member
Joined: Jun 2014
Posts: 899
Likes: 40
From: Chicago
I cannot tune the car as I have an extended warranty, mainly for the SST. On that note, a MAF based ECU will easily adapt to a better flowing exhaust, assuming time delay for combustion pulse to first O2 sensor is the same (which it would be very close with stock O2 housing/downpipe).
Regarding the rear O2 spacer, there is no way it should be needed IF the cat actually works. All the rear sensor does is measure a delta between it and the front O2 sensor. Unlike the front sensor which has a range of 'acceptable' readings, the rear reading is only compared to the front to determine efficiency of the cat. It's kinda humorous to read that a 'high end' cat has the spacer built in - makes me think they sold someone a 'test pipe' with a bulge in it and charged them extra for the cat. I have used spacers (spark plug non-fowlers that you can buy at autozone for $5) on everything from BMWs to Fords to 'fool' the rear O2 sensor (we also made different sized orifices on the spacers 15 yrs ago, long before anyone thought to sell them) on systems without cats, but if the cat does actually work it should not need a spacer. There are hundreds of high flow cats out there that EASILY reduce O2 readings enough to prevent MILs and do not restrict flow - putting the spacer in there simply tells the buyer they are not getting what they paid for.
I guess I'll log the O2 data with Evoscan and see what's happening - the point of my post was to see if this is unique to the TurboXS pipe (i.e. their 'cat' is not working and I was suckered), or if it's a systemic issue (i.e. the stock Evo X cat efficiency range is so tight that many have issues with different brands). As an example, with BMW E46 M3's, the stock programming was way too tight for cat efficiency and many totally stock cars threw MILs long before the cats were bad, causing many warranty claims. BMW quickly recalled the cars for a reflash to 'fix' this, and 'suddenly' the factory cats would last for years longer. Also made it much easier to use test pipes (with a non fowler) or aftermarket high flow cats.
Regarding the rear O2 spacer, there is no way it should be needed IF the cat actually works. All the rear sensor does is measure a delta between it and the front O2 sensor. Unlike the front sensor which has a range of 'acceptable' readings, the rear reading is only compared to the front to determine efficiency of the cat. It's kinda humorous to read that a 'high end' cat has the spacer built in - makes me think they sold someone a 'test pipe' with a bulge in it and charged them extra for the cat. I have used spacers (spark plug non-fowlers that you can buy at autozone for $5) on everything from BMWs to Fords to 'fool' the rear O2 sensor (we also made different sized orifices on the spacers 15 yrs ago, long before anyone thought to sell them) on systems without cats, but if the cat does actually work it should not need a spacer. There are hundreds of high flow cats out there that EASILY reduce O2 readings enough to prevent MILs and do not restrict flow - putting the spacer in there simply tells the buyer they are not getting what they paid for.
I guess I'll log the O2 data with Evoscan and see what's happening - the point of my post was to see if this is unique to the TurboXS pipe (i.e. their 'cat' is not working and I was suckered), or if it's a systemic issue (i.e. the stock Evo X cat efficiency range is so tight that many have issues with different brands). As an example, with BMW E46 M3's, the stock programming was way too tight for cat efficiency and many totally stock cars threw MILs long before the cats were bad, causing many warranty claims. BMW quickly recalled the cars for a reflash to 'fix' this, and 'suddenly' the factory cats would last for years longer. Also made it much easier to use test pipes (with a non fowler) or aftermarket high flow cats.
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