Removing second cat? - Hyundai Genesis Forum
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post #1 of 25 Old 09-11-2019 Thread Starter
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Removing second cat?

What would the gain be if the second cat is removed?
And - will the engine recognize the loss of second cat?

*if it has wheels or boobs, it will cost you*
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post #2 of 25 Old 09-12-2019
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Slight sound difference.

No performance change.

You might smell gas a bit more.

Here we go again !
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post #3 of 25 Old 09-12-2019 Thread Starter
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Originally Posted by Gaijinn View Post
Slight sound difference.

No performance change.

You might smell gas a bit more.

- Ah okey, not good for anything then. Thankīs.

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post #4 of 25 Old 09-12-2019
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They are not needed and will set no codes if gone. You will loose the weight if nothing else.

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post #5 of 25 Old 09-13-2019 Thread Starter
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They are not needed and will set no codes if gone. You will loose the weight if nothing else.
- Ahh, the weight issue, yes : )

I removed the spare wheel from the trunk yesterday and bought a fill spray can instead. That wheel was heavy.

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post #6 of 25 Old 09-13-2019
I'd rather do it myself
 
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Did you have the aluminum spare wheel? My temp spare tire developed a bulge and the tread separated just sitting in the trunk over the years. Went to check the air pressure and could see it was distorted. Never been mounted on the car.

The OE wheels are boat anchors too.

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post #7 of 25 Old 09-13-2019
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The oem spare is a little lighter than a oem wheel/tire.

If you change the wheels because of weight, steel rims are an option. they are lighter than the stock rims.


FYI, the tire repair cans don't to much in freezing temps.
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post #8 of 25 Old 09-13-2019
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dub post
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post #9 of 25 Old 09-15-2019
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Originally Posted by Sweden View Post
What would the gain be if the second cat is removed?
And - will the engine recognize the loss of second cat?
Nice old school Kawasaki ZX7R

Nightmare On Any Street.2014 3.8 R-spec- Best 1/4 mile 11.57 ET @ 118.7 MPH on Nitrous and supporting mods (Many).Featured in GCtuner's featured rides section under ''links''.Many changes since then, too many to list.
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post #10 of 25 Old 09-15-2019
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Second cats flow good ,bit heavy.

Nightmare On Any Street.2014 3.8 R-spec- Best 1/4 mile 11.57 ET @ 118.7 MPH on Nitrous and supporting mods (Many).Featured in GCtuner's featured rides section under ''links''.Many changes since then, too many to list.
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post #11 of 25 Old 09-15-2019 Thread Starter
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Originally Posted by Red Raspberry View Post
Did you have the aluminum spare wheel? My temp spare tire developed a bulge and the tread separated just sitting in the trunk over the years. Went to check the air pressure and could see it was distorted. Never been mounted on the car.

The OE wheels are boat anchors too.
- Yes, the alu spare wheel, but it still was heavy like a iron rim. Donīt know it it was extra thick rubber in that tire or what..

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Nice old school Kawasaki ZX7R
- Thankīs, and yes i like those because of the look.
This one will get a ZX9-engine this winter, so hopefully i will roll out a qiute doped "ZX8" from the garage next spring : )
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post #13 of 25 Old 09-15-2019 Thread Starter
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Originally Posted by AKGC View Post
The oem spare is a little lighter than a oem wheel/tire.

If you change the wheels because of weight, steel rims are an option. they are lighter than the stock rims.


FYI, the tire repair cans don't to much in freezing temps.
- How could steel rims be lighter than alu rims??

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post #14 of 25 Old 09-16-2019
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- How could steel rims be lighter than alu rims??
because the aluminum alloy wheel is a thick chunk of aluminum. The steel wheel is just 3 stamped out pieces of steel, welded together.

The benefits of aluminum start to negate, when you realize how thick an aluminum piece has to be, to match the strength of steel in a given structural scenario
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post #15 of 25 Old 09-16-2019 Thread Starter
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Originally Posted by AKGC View Post
because the aluminum alloy wheel is a thick chunk of aluminum. The steel wheel is just 3 stamped out pieces of steel, welded together.

The benefits of aluminum start to negate, when you realize how thick an aluminum piece has to be, to match the strength of steel in a given structural scenario
- Yes, i didīnt think those Genesis rims were that dense.

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post #16 of 25 Old 09-16-2019
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- Yes, i didīnt think those Genesis rims were that dense.
1 of the 1st things I did to my Gen Coupe , got rid of the heavy OEM rims .

Nightmare On Any Street.2014 3.8 R-spec- Best 1/4 mile 11.57 ET @ 118.7 MPH on Nitrous and supporting mods (Many).Featured in GCtuner's featured rides section under ''links''.Many changes since then, too many to list.
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post #17 of 25 Old 09-16-2019
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Originally Posted by Sweden View Post
- Thankīs, and yes i like those because of the look.
This one will get a ZX9-engine this winter, so hopefully i will roll out a qiute doped "ZX8" from the garage next spring : )
Lived in the Grudge Motorcycle capital in the height of big money street bike racing for 22 years , North Carolina . Guys shoe horned (with lots of fab work ) built Hayabusa motors into GSXR 1000's . My first true fast bike was 1998 ZX-9R .
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post #18 of 25 Old 09-24-2019 Thread Starter
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Originally Posted by Red Raspberry View Post
They are not needed and will set no codes if gone. You will loose the weight if nothing else.
- Still considering this, so...how will it affect the emission values? Here in Sweden we have a control instance "Bilprovningen" that check all cars once a year, and one of the tests is emission pollution.
Also if any "faulty" code is registered due to the lambda-values.

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post #19 of 25 Old 09-24-2019
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Should not make any difference if you primary cats are OK and you have no codes now.

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post #20 of 25 Old 09-24-2019 Thread Starter
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Originally Posted by Red Raspberry View Post
Should not make any difference if you primary cats are OK and you have no codes now.
- Ok, but doesīnt the rear cat also affect the emission mix? Or what is the purpose of that one if not even controlled by the system as the front cat?

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