Tuning Question
Thread Starter
TECH Apprentice
Joined: Apr 2005
Posts: 319
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From: North Carolina
Tuning Question 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?
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?
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)
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
Bird
Thread Starter
TECH Apprentice
Joined: Apr 2005
Posts: 319
Likes: 1
From: North Carolina
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.
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.
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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
And you do need to log cold for all the idle parameters.
Good luck.
Bill
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Verdad Gallardo Thread Starter
TECH Apprentice
Joined: Apr 2005
Posts: 319
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From: North Carolina
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
Thread Starter
TECH Apprentice
Joined: Apr 2005
Posts: 319
Likes: 1
From: North Carolina
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!!!!