PCM Electronic Wizards and DTC Codes

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Originally Posted by Hood

Which is why your cat has no more lives... unburned fuel completes combustion in the exhaust and is a death sentence to the catalyst.

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I'm sure banging it on the ground doesn't help it either

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Originally Posted by Hood

At any rate, you may blow your dyno numbers with this fix.

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I've thought about that a little; it was never a screamer even when the cat was "ok." Might have to put that cool suit cooler in now. Besides, I can always throw in a restrictor.

when i removed my cats, saw an increase of about 10hp. went from 249 to 259 hp.

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Originally Posted by rleng1

when i removed my cats, saw an increase of about 10hp. went from 249 to 259 hp.

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But that is the mighty-mighty LS1. Maybe now I can get to 250...

Good News... Hopefully that fixes the problem.

I hope to fire mine before the weekend is over with the different engine.

I would really like to see you re-dyno prior to Hallett. Your call.
The CAT could have been clogged from day one, thus the reason it was never a screamer.

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Originally Posted by GlennCMC70

I would really like to see you re-dyno prior to Hallett. Your call.
The CAT could have been clogged from day one, thus the reason it was never a screamer.

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It is certainly possible; it did pick up with the new valve springs for 2010 but has been running somewhat warmer at the last couple of events.

If I can squeeze in an official dyno, I'm open to it especially if it seems pretty snappy after I drive it this weekend. Plan B might be to put the "black box" on it Friday at Hallett and Plan C would be put in an SWAGed sized plate.

I'm aware of the risks.

Good deal.

Very good news man. I'm a little surprised about your choice of welding projects (yes to cage, no to exhaust) but to each their own ;) Glad you'll be making Hallett!

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Originally Posted by Al Fernandez

Very good news man. I'm a little surprised about your choice of welding projects (yes to cage, no to exhaust) but to each their own ;)

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Falls into the mandatory vs. optional category. And with the time it took to troubleshoot, I may have run out of days to get a muffler in it. We'll see how it runs/sounds Sunday after some laps at Grandsport.

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Originally Posted by Al Fernandez

Glad you'll be making Hallett!

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There are races and then there are RACES; given my experience to date, I might have to bring "spares."

Ok, so I have a couple of new rules to live by in my racing life:

1) The Mitch Rule: Cats, furry or otherwise, have no place in or near a race car.

2) The Gas Rule: For some explainable reason, probably already covered by Dr. Pederson in the forum, race cars stop running when they run out of fuel... regardless of the position of the needle in the fuel gauge.

3) The Infinite Rate Spring Rule: Again, Dr. Pederson has probably already discussed the change in spring rate when one attempts to compress a spring laying on it's side. So now I know, a rear pigtail spring in a 4th gen can fall over sideways without falling out of the car.

I also learned (again) that there should be a test given to drivers before they're allowed to purchase a German car with 400 or more horsepower; I didn't know that my little, cat free, 114k mile hot rod would outdrag an M5, oh well.

Looks good for Hallett.

Thanks again to Casey, the LAW, and everybody else that helped troubleshoot the car at TWS.