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Aftermarket dump pipe cat location queries.
Posted:
Wed Jun 22, 2011 8:00 pmby cruisn
In all aftermarket dumps ive seen for the Gen4's they do away with the lower cat and maintain the top one.
Is it a requirement for it to be done this to keep the o2 sensor readings happy? Is it possible to do away with the top one and keep the bottom as long as its still between the two sensors?
Cheers
Re: Aftermarket dump pipe cat location queries.
Posted:
Wed Jun 22, 2011 11:58 pmby smythie
Catalytic converters work best when hot. The hotter, the better. I'd say this is high on the list of reasons why people put them so close to the turbine outlet (the turbine sucks a bunch of heat out of the gas as it is)
Aftermarket dump pipe cat location queries.
Posted:
Thu Jun 23, 2011 8:12 amby Gambit
Not too sure on the technicalities but one cat in the mid pipe is usually effective in producing more power. This is how mine is setup and it does sit between the two oxygen sensors. I also still get good fuel economy and closed loop fueling is a non issue.
Re: Aftermarket dump pipe cat location queries.
Posted:
Thu Jun 23, 2011 8:35 amby Ben
Don't quote me, but I'm fairly sure pre-facelift and post facelift OEM are different. The 2.0T has one cat and 2.5T has two.
Re: Aftermarket dump pipe cat location queries.
Posted:
Thu Jun 23, 2011 9:17 amby stew07gt
Mine an 05 gt has 2 .... Also, I think the second sensor sits before the second cat? which I think is why you can have just the one cat?
Re: Aftermarket dump pipe cat location queries.
Posted:
Wed Feb 29, 2012 3:58 pmby hypeboy
Not too sure on the technicalities but one cat in the mid pipe is usually effective in producing more power. This is how mine is setup and it does sit between the two oxygen sensors. I also still get good fuel economy and closed loop fueling is a non issue.
that's a great set up. the set up of yours is really efficient. I thought that the fuel consumption would rise.