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-   -   if i install a cat bypass, will i need to adjust my mixture? (http://forums.pelicanparts.com/porsche-911-technical-forum/331453-if-i-install-cat-bypass-will-i-need-adjust-my-mixture.html)

vash 02-20-2007 01:26 PM
if i install a cat bypass, will i need to adjust my mixture?
 
just wondering. (i will also, install a gutted stock muff at the same time).

thanks
cliff

wachuko 02-20-2007 02:11 PM
Someone that knows for sure will chime in. In my case I did it to the 964 without any additional changes to the car... I would venture to say that you probably will not need to make any changes.

sithot 02-20-2007 02:17 PM
You may or may not plug in the O2 sensor. The system will run rich if left out (by default). This was not the most technically advanced emissions setup.

Good luck,

Tom

Rick V 02-20-2007 02:54 PM
I didn't with my 82. I have the Bursch "test pipe" and 1 in 1out. I also have a new functioning 02 sensor.

goat 02-20-2007 03:07 PM
Cliff I did not have to with my car I just made sure the 02 sensor was in place. But your 3.0 might be a tad different than the 3.2.
Tim.

JBO 02-21-2007 06:45 AM
You may need (want) to richen it up a little, which is what I did. I believe the newer motronic cars will adjust automatically and those folks don't need to do anything.

Loaded 02-21-2007 06:54 AM
YES YES you change your VE with a cat bypass. if all you do is a catbypass then you are wasting your time. Chip your car or richen it....


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