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engineermike
Well-Known Member
The cat temp is an inferred number that is calculated as a function of load, rpm, cam timing, lambda, and spark timing, at a minimum. The cat temp pid channel just tells you the result of this calculation, so if it seems high then one of the inputs above is making it that way.
Not sure if you subscribed to the thread on making cats live, but I’ve done a lot of testing and currently have thermocouples logging collector temp and mid-bed cat temp. I’ve found I can keep cat temp very much in control by using lambda, spark timing, and the oem cat protect functions.
Who did your tune and is COT still functional? If so, what does your lambda drop to in COT?
Not sure if you subscribed to the thread on making cats live, but I’ve done a lot of testing and currently have thermocouples logging collector temp and mid-bed cat temp. I’ve found I can keep cat temp very much in control by using lambda, spark timing, and the oem cat protect functions.
Who did your tune and is COT still functional? If so, what does your lambda drop to in COT?
engineermike
Well-Known Member
What device are you logging with?
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Cobra Jet
Well-Known Member
Out of curiosity and seeing multiple posts on this site from forced induction users stating they've had catalytic converter meltdowns....
Why isn't anyone who is making high power with forced induction using catalytic converters like these:
https://www.brenspeed.com/cvm11k.html
Why isn't anyone who is making high power with forced induction using catalytic converters like these:
https://www.brenspeed.com/cvm11k.html
engineermike
Well-Known Member
$350 for two converters is super cheap and probably junk. I’m far from convinced that any aftermarket cat will be more durable than stock. Every aftermarket cat I’ve seen uses a metal substrate, vs ceramic stock. Ceramic can handle much higher temps than metal, but is susceptible to thermal shock.
After researching this and logging temp data, I believe the first method to protect the cats is through tuning. Various tuners have disabled cat protect, some delay it, and some reduce its span of control. All of these add power at the expense of cat life. Then when your cat melts they say, “what do you expect - it’s supercharged!” I’ve found I can keep the mid-bed temp below 1600 deg (actual not inferred) and damage doesn’t start until over 1680 or so. I’ve also found the temp sometimes peaks AFTER a WOT pull and cools down MUCH slower than the inferred temp says. This means making a second pull within a few minutes of an initial pull sends the cat temps to the moon and the temp model doesn’t even know it.
The next option, to me, would be to install gt500 or hellcat converters on the car. If you thought $350 a pair was expensive, look up the price on those bad boys…
After researching this and logging temp data, I believe the first method to protect the cats is through tuning. Various tuners have disabled cat protect, some delay it, and some reduce its span of control. All of these add power at the expense of cat life. Then when your cat melts they say, “what do you expect - it’s supercharged!” I’ve found I can keep the mid-bed temp below 1600 deg (actual not inferred) and damage doesn’t start until over 1680 or so. I’ve also found the temp sometimes peaks AFTER a WOT pull and cools down MUCH slower than the inferred temp says. This means making a second pull within a few minutes of an initial pull sends the cat temps to the moon and the temp model doesn’t even know it.
The next option, to me, would be to install gt500 or hellcat converters on the car. If you thought $350 a pair was expensive, look up the price on those bad boys…
Proshop
Well-Known Member
@LSchicago FL doesn’t have testing so I’m not familiar with each state’s testing. How often do you have to test? What exactly are they testing and for (I know each state is different)? How mechanically inclined are you?
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GregO
Well-Known Member
Our state typically does not perform visual inspections if there are no OBD red flags or offensive tailpipe odors.
Have you considered HJS or GESI newest metal substrate cats ? The price point is enough to choke a horse.
Cory S
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Forget the ET, what did your MPH do?
re-rx7
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facts
Brad1810r80
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What did the car run? 60ft 1/4 mile and mph. What was the DA compared to last time you ran. If you ran in spring or fall then run in summer car will be slower period.