Added Intake - How to check for possible lean condition?
Thread Starter
Melting Slicks
Joined: Nov 2009
Posts: 3,425
Likes: 14
Added Intake - How to check for possible lean condition?
Slight dupe of another thread but a different question.
I added an intake to my already tuned C6 Z06 (tuned for manifold, TB, and headers, but no intake)
Intake Manufacturer (Halltech) says it should be ok. The MAF will compensate for increased air.
Tuner suggests a re-tune. Unknown if MAF tables were touched, trying to find that out now.
I did a few quick pulls the other day and the car seems ok.
So well, so far so good, but to be certain, how can I check for myself?
I've got a code scanner which I assume can read an AFR. Should I just do a pull and read the AFR? I understand 14.7 is 'perfect', but something a little richer would be better for safety. What should the car be running at before it would be wise swapping back to stock?
Thanks!
I added an intake to my already tuned C6 Z06 (tuned for manifold, TB, and headers, but no intake)
Intake Manufacturer (Halltech) says it should be ok. The MAF will compensate for increased air.
Tuner suggests a re-tune. Unknown if MAF tables were touched, trying to find that out now.
I did a few quick pulls the other day and the car seems ok.
So well, so far so good, but to be certain, how can I check for myself?
I've got a code scanner which I assume can read an AFR. Should I just do a pull and read the AFR? I understand 14.7 is 'perfect', but something a little richer would be better for safety. What should the car be running at before it would be wise swapping back to stock?
Thanks!
Melting Slicks
Joined: Jul 2009
Posts: 2,634
Likes: 1,099
From: South Florida
In closed loop 99% of the time you would see 14.7 because the o2 sensors will correct the fuel delivery to obtain that. The problem is open loop because the car uses PE if the maf table is off your car will run rich or lean. BTW the scanner probably only reads fuel trims and that only tells you half of the story. I think you should get the car retune
Thread Starter
Melting Slicks
Joined: Nov 2009
Posts: 3,425
Likes: 14
Thanks Tarantula, appreciate the input. I will definitely get a retune down the line to maximize my gains, but from a safety standpoint, do you think the car is at risk with the new intake?
And maybe I'm missing something, but could you also explain closed vs open loop? Not sure I understand the difference here.
I also could have sworn I saw another post last night that isn't here anymore, talking about how the fuel trims would adjust for increased airflow. Not sure why it isn't here anymore.
Does anyone else have a recommendation on how to check for a lean condition? Trying to get this all sorted out by Friday as I have an Autocross event on Saturday.
And maybe I'm missing something, but could you also explain closed vs open loop? Not sure I understand the difference here.
I also could have sworn I saw another post last night that isn't here anymore, talking about how the fuel trims would adjust for increased airflow. Not sure why it isn't here anymore.
Does anyone else have a recommendation on how to check for a lean condition? Trying to get this all sorted out by Friday as I have an Autocross event on Saturday.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
You need to hook up a wideband to really check the air fuel ratios. If you had a way to log stuff, you could check through trims and O2's. Without any software to log it or an air fuel ratio gauge there is no way to know for sure. Personally I wouldnt run the car hard unless I knew for sure things were right.
Thread Starter
Melting Slicks
Joined: Nov 2009
Posts: 3,425
Likes: 14
I think under a stock tune I'd be okay (the CAI manufacturer is very clear about this). But with another tune, I guess it opens up a few questions.
I honestly think the car would likely be ok, but since its possible a lean condition could occur, I guess 'better safe than sorry' applies here.
Not really worried about the power gains, I can wait for that, just didn't wanna have to swap intakes back, just to do it again later if I didn't have to.
I honestly think the car would likely be ok, but since its possible a lean condition could occur, I guess 'better safe than sorry' applies here.
Not really worried about the power gains, I can wait for that, just didn't wanna have to swap intakes back, just to do it again later if I didn't have to.
Racer
Joined: Feb 2011
Posts: 468
Likes: 0
From: Phillips Ranch California
True but your car was probably running in the 10's with the stock intake and stock tune as most of our cars do. Do you see where this is going??
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