11-04-2020, 10:05 AM | #1 |
Drives: 2019 Chevrolet Camaro Join Date: Mar 2020
Location: Lantana, TX
Posts: 77
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Installing primary cat deletes without a tune
My main question is this. I have heard that you could take the primary O2's and put them behind the secondary cats and avoid check engine lights. Is there any truth to this.
I am not ready to tune the car just yet. I want to do flex fuel first before spending money on tune. |
11-04-2020, 10:51 PM | #2 |
Theoren Hanks
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I do not recommend it. I did the same thing shortly before I got my first time done and looking at the tables the car ran into a serious lean condition. This can lead to burning out rings faster and can lead to some serious issues. Theoretically you can, it's just not great for the car. Especially if you plan on getting into that higher rev range. I'd recommend looking into a set of long tubes instead of cat deletes. Everyone I've seen including myself has always gone from cat deletes to a set of catted or catless long tubes. Saves you money on a retune if you ever decide to do so
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11-05-2020, 08:42 AM | #3 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,799
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Technically you can make it work as is by installing o2 "no foulers" and it will keep the CEL off but there is no power gain and you lose torque until the torque limits are addressed in the tune.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
11-05-2020, 12:54 PM | #4 |
Drives: 2013 C6Z06 Join Date: Nov 2016
Location: PA
Posts: 1,577
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King can you explain why you lose torque and gain nothing in this case and what adjusting the torque limits does? This is probably why my car went slower at the strip this year than last year.
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11-05-2020, 04:37 PM | #5 |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,751
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I won’t steal King’s thunder as he knows these cars very well, but in a nutshell the E92/E92A ECMs are torque-based. The ECM uses these torque values to calculate (and then measure) the required airflow to hit the torque targets. If you mod your car without tuning, the car will retard spark or close your throttle to keep the torque numbers in line with what it’s expecting to see. So outside of a catback, some cold air intakes, and maybe a ported TB, you need to plan on tuning to go with your mods. If a mod doesn’t need a tune, it’s because it’s not doing much for you...
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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11-05-2020, 09:25 PM | #6 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,799
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^Spot on.
__________________
2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
11-06-2020, 05:44 AM | #7 |
Drives: 2019 Chevrolet Camaro Join Date: Mar 2020
Location: Lantana, TX
Posts: 77
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Thanks guys. I have opted to wait on the exhaust and get a tune and e-85 first. I have have cold air, ported TB, and LT2 so e85 and tune would make a pretty killer combo. Add long tubes later and should be good to go.
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11-06-2020, 09:35 AM | #8 | |
Drives: 2013 C6Z06 Join Date: Nov 2016
Location: PA
Posts: 1,577
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Quote:
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11-06-2020, 11:44 AM | #9 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,799
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It should be helping.
__________________
2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
11-06-2020, 01:00 PM | #10 |
Drives: 2013 C6Z06 Join Date: Nov 2016
Location: PA
Posts: 1,577
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11-06-2020, 04:53 PM | #11 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,751
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Quote:
__________________
2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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