Kooks/Gesi Green Cats going bad... again...

Camaro1973 · 05-24-2021, 08:09 PM

Welp, I’ve been inspecting my green cats every so often with my borascope down the o2 sensor hole. After my first set failed before my engine mods I didn’t want to take any chances, that was around 660rwhp.

Inspected them a few weeks ago and started to notice a bit of collapsing on both cats. Inspected them again today, it’s about the same.

I just don’t think they can really handle the power/boost that they say they can.

First 2 pics are the new shots via borascope, last pic is from the first set (passenger side) that I replaced in March.

Moral of the story, just because you think don’t have issues and they are fine doesn’t mean you actually “don’t have issues”. Inspect them, esp if your over 700rwhp.

Just a note: Last pic may have been an actual failure, as it only happened on passenger side. Drivers side was ok.

Joshinator99 · 05-24-2021, 08:28 PM

What is your target lambda at WOT? How much timing?

gtfoxy · 05-24-2021, 08:28 PM

That’s a neat camera deal.

Details?

Camaro1973 · 05-24-2021, 08:40 PM

Quote:

Originally Posted by Joshinator99

What is your target lambda at WOT? How much timing?

Don't have a wideband connected, timing is 18 degrees. Was tuned by Andrew at CSP, was gone over completely again after cam/heads were done. It's not the tune. Its pushing almost 1k flywheel. These cats are rated at 850 hp (thats not per bank) Its 425hp per bank, and Kooks says that's flywheel not wheel. i Havent data logged it since ive put the cam in it.

Camaro1973 · 05-24-2021, 08:42 PM

Quote:

Originally Posted by gtfoxy

That’s a neat camera deal.

Details?

Got this guy... https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Good for inspection in cylinders, valves etc. Or anywhere it fits

*radz28* · 05-25-2021, 08:42 AM

I remember reading while the C7 ZR1 was in development that there were a lot of thermal issues they had to deal with. I wonder if this is one of those kind of issues.

Maybe the size of the cat is the problem. If they put bigger cats' on, there would be more surface area and it wouldn't restrict as much. I wouldn't know.

ICTsccaCamaro · 05-25-2021, 08:49 AM

Do you need the cats for inspection reasons for your state?

KingLT1 · 05-25-2021, 08:53 AM

This is why I cringe every time I see somebody post they went with Long tube headers and "Green" cats on a boost car. There is a cat out there on the market (G power Ultra rated @ 1700hp) but they cost around 950.00. I believe CSP offers them with their Header package.

Camaro1973 · 05-25-2021, 09:06 AM

Quote:

Originally Posted by ICTsccaCamaro

Do you need the cats for inspection reasons for your state?

They plug in, not sure if they do visual inspection anymore here. But also the smell of raw gas gets to you after awhile too which is why the cats went on.

Camaro1973 · 05-25-2021, 09:08 AM

Quote:

Originally Posted by KingLT1

This is why I cringe every time I see somebody post they went with Long tube headers and "Green" cats on a boost car. There is a cat out there on the market (G power Ultra rated @ 1700hp) but they cost around 950.00. I believe CSP offers them with their Header package.

This is what they sell with their header package, unless there's a secret they didn't tell me

Camaro1973 · 05-25-2021, 09:39 AM

Quote:

Originally Posted by radz28

I remember reading while the C7 ZR1 was in development that there were a lot of thermal issues they had to deal with. I wonder if this is one of those kind of issues.

Maybe the size of the cat is the problem. If they put bigger cats' on, there would be more surface area and it wouldn't restrict as much. I wouldn't know.

This does sound logical tbh.. It doesn't seem like its a melting/heat issue. It seems its the exhaust pressure putting strain on the cells and bending them inwards/outwards or whichever way they want to go.

FoundNemo · 05-25-2021, 10:01 AM

HJS Cats will take the abuse but they are extremely expensive.

Camaro1973 · 05-25-2021, 10:11 AM

Quote:

Originally Posted by FoundNemo

HJS Cats will take the abuse but they are extremely expensive.

Fitment is another issue.

Alain · 05-25-2021, 11:35 AM

bummer. hope you get it sorted out.

thanks for the link to the camera. looks like it's of great quality !!

05-24-2021, 08:09 PM	#1
Camaro1973 Drives: 2019 ZL1 Join Date: Mar 2019 Location: NJ Posts: 1,534	Kooks/Gesi Green Cats going bad... again... Welp, I’ve been inspecting my green cats every so often with my borascope down the o2 sensor hole. After my first set failed before my engine mods I didn’t want to take any chances, that was around 660rwhp. Inspected them a few weeks ago and started to notice a bit of collapsing on both cats. Inspected them again today, it’s about the same. I just don’t think they can really handle the power/boost that they say they can. First 2 pics are the new shots via borascope, last pic is from the first set (passenger side) that I replaced in March. Moral of the story, just because you think don’t have issues and they are fine doesn’t mean you actually “don’t have issues”. Inspect them, esp if your over 700rwhp. Just a note: Last pic may have been an actual failure, as it only happened on passenger side. Drivers side was ok. Attached Images __________________ 928rwhp - 93 \| 1040rwhp/898rwrq - E65 SAE LME 377 LT4 Short Block \| Magnuson 2650 80mm upper w/13% lower (9.06) \| DSX Lid & Valve Covers \| CSP Custom Cam w/32% fuel lobe \| CID Heads \| NW 103mm TB \| Roto Fab Big Gulp \| CSP 2" Headers w/Green GESI Gen 2 Cats \| Borla 3" Full Cat Back w/ S-Type\| Mighty Mouse Wild Catch Can\| Custom Holley Low side Fuel system\| TooHigh PSI Port Injection w/Holley Controller \| Forced Inductions Interchiller w/2 gallon fender tank \| TK Performance built 10L90 Last edited by Camaro1973; 05-24-2021 at 08:43 PM.

05-24-2021, 08:28 PM	#2
Joshinator99 Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018 Location: Petersham MA Posts: 4,749	What is your target lambda at WOT? How much timing? __________________ 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*

05-25-2021, 08:42 AM	#6
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,195 View My Garage	I remember reading while the C7 ZR1 was in development that there were a lot of thermal issues they had to deal with. I wonder if this is one of those kind of issues. Maybe the size of the cat is the problem. If they put bigger cats' on, there would be more surface area and it wouldn't restrict as much. I wouldn't know. __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

05-25-2021, 08:49 AM	#7
ICTsccaCamaro ITCRNRS Drives: 2018 ZL1 1LE Join Date: Jun 2012 Location: Wichita KS Posts: 1,575	Do you need the cats for inspection reasons for your state? __________________ 2018 ZL1 1LE Ordered 6/29/17 Built 11/6/17 Delivered 12/7/17, Summit White, PDR, NAV, https://www.youtube.com/c/tylerpotter SOLD: 2014 Summit White 1LE 2SS/RS, Recaros, NPP, NAV, KONI Yellow's SOLD: 2012 Black 2LT/RS, Fully 1LE swapped, Brembo swap

05-25-2021, 08:53 AM	#8
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,797	This is why I cringe every time I see somebody post they went with Long tube headers and "Green" cats on a boost car. There is a cat out there on the market (G power Ultra rated @ 1700hp) but they cost around 950.00. I believe CSP offers them with their Header package. __________________ 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

05-24-2021, 08:28 PM	#3
gtfoxy Account Suspended Drives: '21 Wild Cherry ZL1 Join Date: Aug 2018 Location: WI Posts: 2,082	That’s a neat camera deal. Details?

05-25-2021, 10:01 AM	#12
FoundNemo Drives: 2019 ZL1 Join Date: Oct 2019 Location: GA Posts: 573	HJS Cats will take the abuse but they are extremely expensive.

05-25-2021, 11:35 AM	#14
Alain Drives: 2016 Challenger Hellcat, 2018 ZL1LE Join Date: Dec 2009 Location: Northern NJ Posts: 3,003	bummer. hope you get it sorted out. thanks for the link to the camera. looks like it's of great quality !! __________________ 2016 Challenger Hellcat /B5 blue/Sepia interior/Brass Monkey Wheels/ 2018 ZL1 1LE/Red hot 2019 Shellby GT 350R/ Oxford white/ Matte Black Stripes/ Carbon Fiber Dash/ Electronics Package #413

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