LS1Z28_98

I just did a cam install. 230's duration .6's lift. It is running very very rich, like brings tears to your eyes rich, and thats through cats!!! I have a tune scheduled for next Thurs. I have 60 miles on the new cam, and I know driving it that rich cant be good.

For my information, what kind of damage will being that rich do?

Next question is once the tune is done, lets say I go to an even less restrictive cat than I have on there. Will that blow the tune I had and have to get it done over?

fast377

iTrader: (52)

You will probably kill your cats running that rich if you drive it a lot. But you shouldn't have any problems changing cats after the tune.

Ed Wright

iTrader: (1)

Burning eyes and no black smoke is usually lean, not rich. They both smell, but not the same.

Bill Bowling

iTrader: (6)

After my cam I was very rich. Your O2's also do not like running so rich.

Good luck.
Bill

2002_Z28_Six_Speed

iTrader: (19)

I think you have to be miss firing and sending alot of raw fuel to the cats. Not to say an aftermarket cam won't. Just that I believe most CATS fail due to misfiring (100% raw fuel)

Bird

iTrader: (25)

With a high lift / longer duration cam, the VE of the cylinders isn't as high at lower engine speeds - the VE table will have to lowered in these ranges to reflect this loss of efficiency - that, along with some other tweaks will take care of your running rich condition. A good tuner will be able to do this with no problems.

Bird

LS1Z28_98

Well this is interesting,

I have no smoke that I can see, except the light smoke from start-up, getting the condensation out of the pipes. I say its rich because I can just about watch the fuel gauge go down now. No complaints as its not a daily driver. Also I'm not feeling the gains I thought I would. Been my experience that being too rich makes the car fall on its face.

I have a tune lined up next week, so its going to take some restraint not to drive it till then.

Never been through the tune process before. I talked to the guy and he said he needs me to drop it the night before so he can do a cold start tune. I get the impression it could take all day? No complaint if it does, just want it done right.

Bill Bowling

iTrader: (6)

It should take most of the day to do it right. Is he tuning on a dyno and/or the road? I like to see both.

And you do need to log cold for all the idle parameters.

Good luck.
Bill

LS1Z28_98

I know its definately going on the dyno, I also believe he does some work on the road as well. He has been highly recommended for my area, and has done some work on my car before, so I know he'll do the right thing

Burnt_bizcut00

iTrader: (1)

If you run too rich you could be washing your cylinders out which would be bad! I would wait for the tune

LS1Z28_98

Well its not being driven again until the tune. I have 97 miles on it the way it is to make sure the cam spins off any loose metal. The oil is changed and she's parked until then. I hope that 97 miles wasnt enough to do any damage!!!!