2 Step w/ Catalytic Converters
2 Step w/ Catalytic Converters Ok, I'm in need of launch control (2 step) for my M6 Camaro SS.
It's a street car that sees a track visit 5-6 times per year.
It passes emissions here in Atlanta, GA and does have ARH headers/y-pipe w/ cats. I'm not sure what type of cats ARH uses... bullets?
At any rate, I'd like to hear from the guys that run a 2 step at the track w/ cats with good results, i.e. no catalyst failure.
I only plan to mat the throttle and engage the 2 step on the 1st/2nd green. So the time exposure would be minimized - maybe 2 seconds.
Thanks for your help guys.
It's a street car that sees a track visit 5-6 times per year.
It passes emissions here in Atlanta, GA and does have ARH headers/y-pipe w/ cats. I'm not sure what type of cats ARH uses... bullets?
At any rate, I'd like to hear from the guys that run a 2 step at the track w/ cats with good results, i.e. no catalyst failure.
I only plan to mat the throttle and engage the 2 step on the 1st/2nd green. So the time exposure would be minimized - maybe 2 seconds.
Thanks for your help guys.
The raw fuel dumping into the exhaust will destroy the cats. I had the dynatech headers with the swappable cat/testpipes, but I barely ever used the cats. I let my cousin drive the car and he engaged the 2 step not knowing the cats were on and blew one of them out the tailpipe. It didn't take more than a couple seconds. I was standing outside the car and before I could scream for him to shut it off there was a loud backfire and sparks flying out of the exhaust.
The raw fuel dumping into the exhaust will destroy the cats. I had the dynatech headers with the swappable cat/testpipes, but I barely ever used the cats. I let my cousin drive the car and he engaged the 2 step not knowing the cats were on and blew one of them out the tailpipe. It didn't take more than a couple seconds. I was standing outside the car and before I could scream for him to shut it off there was a loud backfire and sparks flying out of the exhaust.
I figured that back firing was just par for the course with a 2 step... cats or no cats.
So, after the back fire what happened? Does the cat just clog and the car won't run?
Last edited by ATLSS; Apr 18, 2009 at 01:08 PM.
He turned the 2 step on in my driveway just to hear the sound. The cat blew apart and the chunks flew out the tailpipe almost instantly. The raw fuel hitting the glowing cat will ignite and explode in the exhaust.
Yup. 2 step plus cats, is a no no. You want to hollow them out it's a good way to do it 
Just unhook the catback because there's gonna be chunks of cat. converter flying out the pipe and will be jammed in the muffler and whatnot.
Hell when I put the 402 in my car the cats blew out just from running the unleaded race gas. Probably got about 200 miles on the setup and about 10 track runs and they were crumbling and flying and clogging up the catback.
Just unhook the catback because there's gonna be chunks of cat. converter flying out the pipe and will be jammed in the muffler and whatnot.
Hell when I put the 402 in my car the cats blew out just from running the unleaded race gas. Probably got about 200 miles on the setup and about 10 track runs and they were crumbling and flying and clogging up the catback.
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I'm skipping MCE this time.... but I'll be heading back to Silver Dollar this time next month if you're game?
I'd like to keep the cats functioning if possible.... have you used the vallet mode in EFI Live for launch control?
valet mode in EFI live is the launch control. Also very fun from a roll, ask some bikes about my car on the 2 step next to them with open headers 
and yes the stock rev limiter is a fuel cut.
and yes the stock rev limiter is a fuel cut.
Ok... so with EFI Live I can have a launch control that cuts fuel and I can keep my cats??
yes. We have been using it for a 2 step during shifts on a m6 car. Installed a micro switch on the clutch pedal. Set the 2 step to be like 5k. WOT shifts are like butter now. It pulls the power away while you shift so it makes it very easy. This car still has the cats in it.
However I dont recommend sitting on the 2 step for ling, being that it is a fuel cut.
However I dont recommend sitting on the 2 step for ling, being that it is a fuel cut.
