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08-01-2007, 11:31 PM | #26 |
Scooby Specialist
Member#: 4574
Join Date: Mar 2001
Chapter/Region:
NESIC
Location: Bristol, CT
Vehicle:2020 Sierra 1500 AT4 Summit White |
Glad to see you got the car running right now.
MRF you do have a point that it should know exactly how much air is entering and do its job but I am still a firm believer that if you modd or change anything in the intake track that you should log your STFT & LTFT and if they are over 4% +/- that you should look to tune this out. -Rene
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08-02-2007, 12:06 AM | #27 | |
RIP 3/18/1965 to 1/10/2008
Scooby Specialist Member#: 91500
Join Date: Jul 2005
Chapter/Region:
MWSOC
Location: Schaumburg/Chicago
Vehicle:hmmm sr-30+640cc=? I has teh Endless BBK. |
^^^this makes sense to me, but there seems to be a general hysteria about tuning for after-market intakes/inlet pipes or hoses.
any explanation for this? what rules of thumb are there for say, an APS cai and/or APS turbo inlet? THANKS...! Justin Quote:
:amen: |
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08-02-2007, 08:22 AM | #28 |
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SWIC
Location: Gilbert, AZ
Vehicle:2009 G8 GT Cammed, sprayed, stalled |
I recently tuned a friends 05 STI with the APS 65mm CAI (stock injectors) and I did have to rescale his MAF table as it was lean on the bottom end and slightly rich on the top with the stock MAF table. Yes, I tuned with an LC-1 WBO2.
I guess APS claims that you do not have to recalibrate the MAF for this intake but I would disagree. Also, he added the TGV deletes and those caused a nasty rich spot right during spool where the TGVs would normally affect the injector spray. With the deletes, I guess we got a different, better, more consistent spray pattern and made the car rich. |
08-02-2007, 10:07 AM | #29 | |
Scooby Specialist
Member#: 4574
Join Date: Mar 2001
Chapter/Region:
NESIC
Location: Bristol, CT
Vehicle:2020 Sierra 1500 AT4 Summit White |
Quote:
With what I said before about the STFT & LTFT ideally you would want to get a base log of these before the change. You would log Air Fuel Correction #1 and Air Fuel Learning #1 along with MAF voltage. From there you can see for certain MAF voltages if things are out of whack or not. If I see anything +/- 4% or higher I try to tune this out to about 3% or lower. Right now most of my LTFT are -1.56% or -0.78%. Also when your fuel trims are in the negative the car prefers this rather than when they are positive and adding fuel. -Rene |
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08-02-2007, 10:51 AM | #30 | |
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Location: Pittsburgh, PA
Vehicle:. Always drive the race line . |
Quote:
that being said, i prefer it the other way around so the car is slightly harder to start. that gives me a couple more revolutions at low engine speeds to get the oil moving before everything starts spinning at 1000+ rpms. |
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08-02-2007, 12:25 PM | #31 |
RIP 3/18/1965 to 1/10/2008
Scooby Specialist Member#: 91500
Join Date: Jul 2005
Chapter/Region:
MWSOC
Location: Schaumburg/Chicago
Vehicle:hmmm sr-30+640cc=? I has teh Endless BBK. |
good reading, responses appreciated, the learning curve moves. question: LTFT? STFT? I'll google them, certainly, but an explanation here would be useful to more than just me, I think thanks Justin EDIT: got it, more reading |
08-02-2007, 03:22 PM | #32 | |
Scooby Specialist
Member#: 4574
Join Date: Mar 2001
Chapter/Region:
NESIC
Location: Bristol, CT
Vehicle:2020 Sierra 1500 AT4 Summit White |
Quote:
STFT - Short term fuel trim, is instantaneous correction value determined from the oxygen sensor readings. Under normal conditions it cycles rapidly around the 0 percent correction value and is only functional during closed loop operation. Hope that clears it up for you. -Rene |
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08-03-2007, 12:47 AM | #33 |
RIP 3/18/1965 to 1/10/2008
Scooby Specialist Member#: 91500
Join Date: Jul 2005
Chapter/Region:
MWSOC
Location: Schaumburg/Chicago
Vehicle:hmmm sr-30+640cc=? I has teh Endless BBK. |
yu-up.
looked that up, makes more & more sense. will keep reading... thanks, man |
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