ATLSS

iTrader: (7)

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.

5.3LJimmy

iTrader: (10)

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.

35th SS

iTrader: (2)

what he said.you will eventually ruin/destroy the cats.

ATLSS

iTrader: (7)

So he engaged the 2 step at the line and then the car went boom?

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?

5.3LJimmy

iTrader: (10)

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.

JL ws-6

iTrader: (50)

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.

ATLSS

iTrader: (7)

Thanks for the info guys....

Does anyone plan to make a launch control that cuts fuel?

JL ws-6

iTrader: (50)

Nope.

dlove

iTrader: (23)

the 2 step built into efi-live is a fuel cut.

JL ws-6

iTrader: (50)

Really?/ Intresting, I thought they all just cut spark.

Learn something new every day

cablebandit

iTrader: (37)

Just get rid of the cats and tune the cats out.......

ATLSS

iTrader: (7)

The stock rev limiter cuts fuel as well...

When you say the 2 step built into efi-live, are you saying that through efi-live you can actually setup the stock computer as a launch control??

ATLSS

iTrader: (7)

It may come to that man... I'm just exhausting all resources before I rip the y-pipe out of the car and spend more cash....

cablebandit

iTrader: (37)

oh yeah...congrats on the times. I forgot to reply to your email and yes i owe you 20bux!! Gonna go to mce weekend?

sell the cats or just gut them.

ATLSS

iTrader: (7)

Just buy me a beer sometime man.

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?

dlove

iTrader: (23)

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.

ATLSS

iTrader: (7)

Ok... so with EFI Live I can have a launch control that cuts fuel and I can keep my cats??

dlove

iTrader: (23)

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.