[zipphreak]

The ECU does not have a real EGT sensor, it is a calculated temperature so it's not something I would trust.

Get something with a proper HJS cat and don't worry about it !

-Paul

[KAY-OS]

Originally Posted by zipphreak

The ECU does not have a real EGT sensor, it is a calculated temperature so it's not something I would trust.

Get something with a proper HJS cat and don't worry about it !

-Paul

Hi Paul. Oh I didn't know the exhaust temp was calculated! Thanks for the info.
HJS cat won't melt?

[Liquidpaper]

Originally Posted by KAY-OS

Hi Paul. Oh I didn't know the exhaust temp was calculated! Thanks for the info.
HJS cat won't melt?

The OEM cat is ceramic. The HJS (and other) sport cats are metallic -- higher melting point, can handle more abuse. We just prefer the HJS cat because they are high build quality and will most likely last a lot longer without throwing a P420 code, and will properly scrub emissions.

[KAY-OS]

Originally Posted by Liquidpaper

The OEM cat is ceramic. The HJS (and other) sport cats are metallic -- higher melting point, can handle more abuse. We just prefer the HJS cat because they are high build quality and will most likely last a lot longer without throwing a P420 code, and will properly scrub emissions.

ah I see. Learning something new everyday.

[DrRobert]

Any follow up on this? How are those HJS cats working out?

[Liquidpaper]

Love it. Got the Fabspeed pipe. No check engine light, better throttle response, and good sound (not too loud).

[DrRobert]

Originally Posted by Liquidpaper

Love it. Got the Fabspeed pipe. No check engine light, better throttle response, and good sound (not too loud).

Awesome. Any increased exhaust smoke or smell?

[Liquidpaper]

None. That's why I opted for the more expensive cat.

[DrRobert]

Originally Posted by Liquidpaper

None. That's why I opted for the more expensive cat.

Wow. That's great news. Might have to get me one of those. How much louder is it than the stock cat?

[Liquidpaper]

Originally Posted by DrRobert

Wow. That's great news. Might have to get me one of those. How much louder is it than the stock cat?

Not much, but changes the tonal quality of the exhaust. Makes it a bit more raspy. Sounds good. At least I think.

[DrRobert]

Originally Posted by Liquidpaper

Not much, but changes the tonal quality of the exhaust. Makes it a bit more raspy. Sounds good. At least I think.

Nice. Thanks a lot, that helps me out a lot!

[DrRobert]

What kind of fuel were you using when you melted the OEM cat?

[Liquidpaper]

Originally Posted by DrRobert

What kind of fuel were you using when you melted the OEM cat?

91 octane pump gas.

[rich8566]

Originally Posted by Liquidpaper

Ladies and Gents:

I melted my catalytic converter from (I presume) track abuse. Don't worry, they fixed it under warranty, but I am going to go get the Fabspeed HJS Cattled Downpipe to swap in from now on -- I can't afford to keep melting these things (BMW might get suspicious).

The shop foreman at Santa Monica BMW called me and said "Yep, looks like a lava flow in there." He was pretty cool about it actually. Props to them.

Anyway, for those of you who track a lot, please be advised...

I've tracked my 235i over two dozen days over the last two seasons with no issues - other than using up plenty of gas, tires and brakes. How in the world did you melt a cat?

[Liquidpaper]

Originally Posted by rich8566

I've tracked my 235i over two dozen days over the last two seasons with no issues - other than using up plenty of gas, tires and brakes. How in the world did you melt a cat?

You know, I really don't know, and neither did the tech. I'm just chalking it up to a defective cat. BMW makes a lot of cars - it happens.

[Total madness]

Originally Posted by Fabspeed Motorsport

We are currently experiencing around a 70% M235I success rate with no check engine lights on our Catbypass pipes + our o2 spacers.



Fabspeed Sportcat downpipe

Would love a quote to buy only the spacers ? Thx for the pm in advance ;-)