Kooks high flow cats. - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Ds98formula · 05-05-2019, 08:58 PM

Has anyone put kooks long tubes with high flow cats on and not popped a check engine light? I bought a 2015 zl1 on Monday and it has them but no check engine light. I already have an appointment with speed inc to dyno the car and check my air fuel ration to make sure it is safe. Until then I plan on keeping the car out of boost. I am just wondering if long tubes with high flow cats always means check engine light? The dealership I bought the car from had no idea if the car was tuned.

silversleeper · 05-06-2019, 11:41 AM

Quote:

Originally Posted by Ds98formula

Has anyone put kooks long tubes with high flow cats on and not popped a check engine light? I bought a 2015 zl1 on Monday and it has them but no check engine light. I already have an appointment with speed inc to dyno the car and check my air fuel ration to make sure it is safe. Until then I plan on keeping the car out of boost. I am just wondering if long tubes with high flow cats always means check engine light? The dealership I bought the car from had no idea if the car was tuned.

Even with no cats they can be tuned to run properly in closed loop mode and no lights.
Tuning and a sensor extension might be required.

BURNMUP · 05-06-2019, 12:51 PM

I run Kooks long tube headers 1-7/8 with high flow cats. Never had an engine light go on. You car needs to be tuned, a quality shop will fix the problem. How ever a cat could be melted or blown out, its more common than you think.

Ds98formula · 05-06-2019, 01:22 PM

Quote:

Originally Posted by BURNMUP

I run Kooks long tube headers 1-7/8 with high flow cats. Never had an engine light go on. You car needs to be tuned, a quality shop will fix the problem. How ever a cat could be melted or blown out, its more common than you think.

Did you run the with headers no tune at all or did you tune them right away? Mine will be going in on May 15th to check the air fuel ratio and tune if it not safe.

RobZL1 · 05-06-2019, 04:31 PM

The MIL will occur due to the rear O2 sensors producing signals out of range, regardless of AFR. The DTC's for the rear O2's need to be turned off, regardless of whether or not the airflow model needs updated.

Ds98formula · 05-06-2019, 04:42 PM

Quote:

Originally Posted by RobZL1

The MIL will occur due to the rear O2 sensors producing signals out of range, regardless of AFR. The DTC's for the rear O2's need to be turned off, regardless of whether or not the airflow model needs updated.

Ok cool. So is this somthing that happens 100 percent of the time? My car has headers with high flow cats but not a MiL on. It will be checked but just trying to see if it is most likely tuned or not.

brick59 · 05-06-2019, 05:53 PM

I have kooks 2" headers and kooks high flow cats no MIL, as said above your tuner need to turn DIC off for the rear O2's that will stop the MIL, also I have not melted them (yet) with many 1/4 miles runs but I am on E85 and that helps.

ZMEnow · 05-06-2019, 07:23 PM

Quote:

Originally Posted by brick59

I have kooks 2" headers and kooks high flow cats no MIL, as said above your tuner need to turn DIC off for the rear O2's that will stop the MIL, also I have not melted them (yet) with many 1/4 miles runs but I am on E85 and that helps.

Never had an issue at the 1/4, but once I started tracking is when you better watch.

RobZL1 · 05-06-2019, 07:41 PM

Quote:

Originally Posted by Ds98formula

Ok cool. So is this somthing that happens 100 percent of the time? My car has headers with high flow cats but not a MiL on. It will be checked but just trying to see if it is most likely tuned or not.

It might be okay if you have the Kooks/GESi "green" cats, but not a guarantee. Those codes can take a while to set, actually.

05-05-2019, 08:58 PM	#1
Ds98formula Drives: 2015 M6 ZL1, 2012 silverado Join Date: Apr 2019 Location: Chicago Posts: 103	Kooks high flow cats. Has anyone put kooks long tubes with high flow cats on and not popped a check engine light? I bought a 2015 zl1 on Monday and it has them but no check engine light. I already have an appointment with speed inc to dyno the car and check my air fuel ration to make sure it is safe. Until then I plan on keeping the car out of boost. I am just wondering if long tubes with high flow cats always means check engine light? The dealership I bought the car from had no idea if the car was tuned.

05-06-2019, 12:51 PM	#3
BURNMUP Drives: 2013 ZL1 Convertible Join Date: Apr 2017 Location: New Milford, CT Posts: 3 View My Garage	I run Kooks long tube headers 1-7/8 with high flow cats. Never had an engine light go on. You car needs to be tuned, a quality shop will fix the problem. How ever a cat could be melted or blown out, its more common than you think. __________________ Cold air inductions, ceramic coated headers, Corsa exhaust, 90mm. TB, Hurst Pistol Grip, pulleys, cams, a shit load of other parts, and a killer F'n tune from Jannetty Racing. 700 HP+ club member.

05-06-2019, 04:31 PM	#5
RobZL1 fo'shizZL1 Drives: 2017 ZL1 Join Date: Aug 2017 Location: ATL Posts: 1,281	The MIL will occur due to the rear O2 sensors producing signals out of range, regardless of AFR. The DTC's for the rear O2's need to be turned off, regardless of whether or not the airflow model needs updated. __________________ 2017 ZL1 M6 Black \| Maggie 2650 // 103TB // Big Gulp Past Rides- 2014 ZL1 M6 Red Hot \| Tons of mods 2004 CTS-V M6 Silver \| Many mods 1995 Corvette M6 Torch Red \| A few more mods 1992 Camaro M5 White \| A few mods

05-06-2019, 05:53 PM	#7
brick59 Sucker Punch Drives: 2013 Black ZL1, 2007 Silverado LTZ Join Date: Jul 2014 Location: N.E. Ohio Posts: 275	I have kooks 2" headers and kooks high flow cats no MIL, as said above your tuner need to turn DIC off for the rear O2's that will stop the MIL, also I have not melted them (yet) with many 1/4 miles runs but I am on E85 and that helps. __________________ 427 Dart SHP Pro LS Block, Callies Magnum Crank, Callies Ultra I Beam Rods, Diamond Pistons, AGP twin Turbos 6865, Mast heads, Cam Motion LLR cam, Morel tie bar lifters, Crower roller rockers, NW 103MM TB, ID2600 XDS, Fore Triple, DSX, E85, ARH Turbo Headers, Corsa, Jakes stage 5 4L80, Circle D, RPM Roll Bar, BMR, Carlyle Racing 15" conversion kit.