Supercharger & Burned CATs

Get an AFR gauge and watch what is going on. Bad tune would be fine at WOT but everything else between. Timing advance might be off too, that would explain the bad MPG. Maybe the BullyDog is behind all of this.

 

I'm gonna say you were running stupid rich like everyone else not running a good tuner...so Torspd...and put to much fuel through the cats, air injection in the headers added some O2 to the mix and you burned out your cats super quick. Wouldn't be surprised if most of us have deteriorating cats, just depends how rich it is.

 

Only glanced at the tread, very busy atm, will look more later. What are the afrs and egts? Is this a trd tune or other. No exhaust leaks? Stock pulley? Stock fuel pump? What gas are you using?

 

I don't have afr or boost gauges yet. Bully Dog tune. No exhaust leaks. Stealth pulley. Stock fuel pump. 91 octane gas.

 

I would undo the bulleydog tune. Trd reflash with fpr mod would be good for that steal pulley.

 

Ever seen a diesel into regen? Lolz

 

You talking about rolling coal lol? I'm not saying rich is gonna toast a cat every time. But rich enough can, if exhaust gases are hot enough and with the 2012+ header air injection you've got the right mixture to cook off unburnt stuff, frying the cat. Just a suggestion

 

What gauges & sensors are recommended for AFR & boost? I was thinking of getting sensors hooked up through the bully dog so I don't have to install separate gauges. Has anyone else gone that route?

 

Speedhut.com has some good ones you can customize, otherwise most people go with AFE for most of their Boost/A/F gauges. Just play with google a bit and find one you like and hook it up.

 

Not sure about AFE, must mean AEM. I have a PLX gauge with the Perrin steering mount. Fits very well. I have two sensors connected to one gauge Along with the PLX KIWI bluetooth OBDII Dongle. The dongle connects to the Torque app and I can monitor oem sensors, view and reset trouble codes, all sorts.
Interested to hear what you find. I just received the same headers and want to make sure that I don't wreck them.

 

Oops yeah meant AEM

 

Yes it would be better because you are introducing more air and using less fuel in that mixture. The byproduct of running lean however is heat. The cylinders run hotter therefore producing more heat in the exhaust. Hot cats are not happy cats and will quickly experience failure the longer they run hot.

Ever seen a cherry red exhaust before? That is some dangerous shit right there. Lol.

If you burnt your factory cats you are definitely running lean somewhere in the mixture. Whether it is in cruise, part, or full throttle.

As previously mentioned, get a air fuel ratio gauge. It will give you some good insight into what's going on.

While the TRD tune is not the greatest since they program it to run pig rich I'd rather see pig rich mixtures before I see lean. For sake of saving your engine also.

 

Interesting to see the power difference between the 3.4 motor and the 4.0 motor power at the rear wheel and gas mileage when both are supercharged at 5500 feet, (stock headers for me)
I would say something's very wrong if your getting 14-15 mpg
3.4 motor hits 260 pounds of toque at 2200 rpms, and getting 20 mpg

 

This is not possible (without an other ECU). Once you have installed the BD tune and even if you "undo" it, it's still there. TRD flash is not possible then.

 

Lame af. Was hoping it was like their diesel tunes where the stock tune is 'stored' and could be reflashed later if desired.

 

This guy knows what hes taulkin (accent) bout(accent).



I would recommend an AEM air fuel ratio guage. As the dude stated above, at wide open throttle you wan tto see about 11:1. 12:1 will get you mroe power but 11:1 provides more safety. Your cats took a dump most likely because you are running to rich somewhere in the power band. WIth your cruise control on you should be about 14.7/1 - 13.7/1. If you see lower numbers at cruise then you are to rich and will cause extra heat on them cats.

 

Thank you for all the input. I talked with Bully Dog today & they uploaded a new tune. I'm shopping for a pair of AFR sensors now.

Going forward - after I get the AFR gauge installed, should I drive it a bit to see how it's doing before I have the cats replaced?

 

I will have a set for sale here very soon, within the next few weeks i would think. The afr and boost gauges are speedhut custom, and the wideband is an innovate lc2. I even have an extra bung for the exhaust you can weld on. If interested i can PM you some pictures.

 

Actually fuel provides a cooling effect on cats. You run a much higher risk by running a cat lean before running a cat rich. So even if you are running rich a cruise, the only issue you will have is lower fuel economy in the short term. Of course an overly rich or overly lean condition at cruise is something you want to correct regardless.

AEM X-Series gauge. AWESOME product. (Of course I'm running a Denso AFR sensor instead of Bosch now)

 

fuel does provide a xooking effect when you run to rich the raw fuellights off in the exhaust prematurely and flares. you see it on formula cars when they let off cause they have no cats. also on big tirbo cars with no cats.