1turbofocus said:If you run the CAT with an AF of between 11.6 and 12.0 you will be buying MANY CATs every year this much fuel going through a CAT is insane dont even try it you could stop up the CAT and loose an engine from it
Man you got to love when this happens , This found its way to FJ and like allways they dont have the good sence or balls to just post here , If they did i wouldnt bash on them so much but sence they feel they have to make there sly comments where i cannot post here it goes, First to randys he states "1turbofocus said:If you run the CAT with an AF of between 11.6 and 12.0 you will be buying MANY CATs every year this much fuel going through a CAT is insane dont even try it you could stop up the CAT and loose an engine from it Tom
Randy first you have to make enough power to cause a rich condition and one that makes enough power for it to work on the CAT , I cannot beleive you made this statement ? ? ?Originally posted by FocusSportVP on FJ
I don't think I believe that having 11.6 - 12.0 A/F will cause cats to die early. I run a cat on my 1.8T and it's been fine for years with low to mid 11s A/F ratio.[/B]
Originally posted Dudly on FJ [/i
I read Tom's post over on FF regarding the cat. I considered replying to ask how exactly a failed cat would kill the engine
Keep in mind that for a street-driven car, you'll spend 99% of your time at a stoichiometric AFR. My AFR dips into the 10's at some spots (I'm planning a complete re-do of my intake system, so I haven't bothered to dial-in my MAF perfectly), and my cat is just fine. I've only got about 11,000 miles on my XIOS kit, though.
In general, constant WOT is bad for the cat. It doesn't matter if you're running turbo, supercharger, or naturally aspirated. The only way to keep WOT operation cat-friendly would be to run one hell of a goofy tune, i.e. you'd want a stoichiometric AFR at WOT. I have no idea what that would do to the timing you'd need to run, or if it's even possible to run a Focus within all those contraints. As you pull timing (because of the lean WOT AFR), your EGT's will become a problem at some point, so you'll either melt the cat from excessive fuel or you'll melt the cat from insanely high EGT's. Personally, I'd rather melt the cat from excessive fuel, since high EGT's will kill the engine.
I don't see how running a cat with the XIOS kit will put the engine at risk - the turbo will be at risk, though. If the cat fails, you'll damage the turbine, but even if you did so much damage to the turbo that the compressor side somehow threw out some shrapnel, the debris wouldn't get past the intercooler.
Maybe a clogged/failed cat will damage the engine in some way - I dunno.
Bottom line is that if you want the absolute best safety, just install a race header or off-road pipe (or use a gutted cat)..[/B]
LOL, great catch! While an interesting read on the effects of A/F ratio on catalytic converters, what really needs to be addressed next is making sure the OP knows what he has under the hood and what his correct options are finalley said:Looking at FocusTuner27's sig, he has a 2.3...
I was under the impression from Xios that the kit was compatible with the 2.3, I am sending them an email now though to check on this...hoping that maybe if the wasn't compatible, that it magically will be now...just because I emailed them.jr_psychologist said:LOL, great catch! While an interesting read on the effects of A/F ratio on catalytic converters, what really needs to be addressed next is making sure the OP knows what he has under the hood and what his correct options are