Its literally the WORST, thing you can do, and will 100% lead to a cat failure. Since it shutting off the engine actually heats the cats up. The engine running, actually cools the cats, since oxygen would warm them. (AKA, shutting off the engine allows fresh air to come into the exhaust pipes)Why does shutting the engine off quickly after a dyno pull stress the cats? I would have thought not running exhaust gas through them would let them cool faster.
Late reply but I’ve been at ten-ish PSI on my 3.2 KB for approx 16k with factory cats with zero issues. Mines tuned to be fat when it counts though since I don’t need to eek out every ounce of power like an NA car.How is it going for boosted cars running cats?
Looking for 9-10lb pump gas or pump gas/additive type setups
Just curious if peeps have been melting cats or running into issues
My theory is larger diameter catalyst for a lower specific heat load and also most likely a more accurate cat temp math model in the pcm. I would like to know if the predator cats are larger and if they will retrofit to the gen3 5.0.What's special about the cats on a hellcat or gt500? Size?
That's interesting you mention the temp model. The whipple tunes and few roush tunes I've looked at on the hptuners board show adjustments to the cat temp tables.My theory is larger diameter catalyst for a lower specific heat load and also most likely a more accurate cat temp math model in the pcm. I would like to know if the predator cats are larger and if they will retrofit to the gen3 5.0.
i know youve gotten a ton of responses already but i ran my KB car for over a year with cats. 18k miles, never an issue. when i took them off they werent collapsed at all.How is it going for boosted cars running cats?
Looking for 9-10lb pump gas or pump gas/additive type setups
Just curious if peeps have been melting cats or running into issues
Heck, I still can't figure out Ford V8 cylinder numbering even after owning em for 30 years. I learned on the General where the driver side are 1 3 5 7.Is bank 2 the drivers side? Seems like most get the p0430 code. Is the drivers side (the expensive side) the one that fails most often?