08-29-2013, 07:01 PM | #1 |
having FUN now 13.66@101
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Fuel Trims while at the drag strip doing a data log
This thread is in response to another thread, in which we spoke about posting our fuel trims and the use of a breather. I did not want to thread jack the other one so I created a new thread. I am posting a few different screen dumps. Each screen dump shows what is shown at the top left corner. The data logs were created while I was at the drag strip back in April. The pass is in the 650 to 775 time frame section.
The other thread was: http://www.camaro5.com/forums/showthread.php?t=309513 (my post talking about posting the trims was # 172 The weather conditions this day are as follows.
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Last edited by rtcat600man; 08-29-2013 at 08:58 PM. Reason: added the comment about the use of a breather. |
08-29-2013, 07:30 PM | #2 |
Drives: 2012 SIM 2LT/1970 Camaro Join Date: Nov 2012
Location: Near Minneapolis, MN
Posts: 1,578
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Nice! I like data.
Do you run a breather?
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08-29-2013, 08:08 PM | #3 |
having FUN now 13.66@101
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Yes I currently have a breather, has been there for over 2 years. But with all the talk about it working right or not. I am going to do some more data logging with it removed and the plugs removed and the stock set-up back in place, just so that I can compare the difference.
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08-29-2013, 08:09 PM | #4 |
Eh, that'll happen
Drives: 2010 2SS Join Date: Apr 2012
Location: Mesa, Arizona
Posts: 1,841
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So whats the point of posting fuel trims during a drag pass? Fuel trims are turned off any time the computer is in open loop. (WOT) Of course its going to flatten out because they are no longer active. Am I missing something?
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2010 Camaro SS LS3 - No Modz
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08-29-2013, 08:20 PM | #5 | |
having FUN now 13.66@101
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Quote:
You missed the point, re-read it where I mention this is because of the info from another post and we were discussing the use of a breather and fuel trims. Also, I mention that the drag pass was in the time frame of 650 - 775. The whole time frame runs from 0 - 2200+ Thanks for the info thou.
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08-29-2013, 08:35 PM | #6 |
Eh, that'll happen
Drives: 2010 2SS Join Date: Apr 2012
Location: Mesa, Arizona
Posts: 1,841
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Oh, ok, my bad. I though you were bragging that your trims were 0% during the pass. Im sorry!
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2010 Camaro SS LS3 - No Modz
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08-29-2013, 08:56 PM | #7 | |
having FUN now 13.66@101
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Quote:
NP...........Thanks for understanding and taking the time to say so........
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08-29-2013, 10:51 PM | #8 |
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Rtcan600man once again, you are the man! Thanks for posting! It definitely makes me feel more comfortable about the Vararam breather . . . I'm not using my Rx breather because I am afraid of blowing out a seal since it can't release pressure . . . I have it sitting in my garage atm.
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08-30-2013, 07:12 AM | #9 | |
Stop writing "vert", ffs!
Drives: 2011 2LT Convertible Join Date: Feb 2012
Location: Gambrills, MD
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Quote:
I'm still working on the screen shots. I'll post them up later, on my lunch break.
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08-30-2013, 08:17 AM | #10 |
Drives: 2010 M6 2SS Join Date: Mar 2011
Location: South Windsor, CT
Posts: 1,202
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That's not entirely true...positive trims before entry to PE carry into PE and thus screw up the PE fueling if they were adding due to a vacuum leak.
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08-30-2013, 12:02 PM | #11 |
Stop writing "vert", ffs!
Drives: 2011 2LT Convertible Join Date: Feb 2012
Location: Gambrills, MD
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So here are my fuel trims plots. These data are from a data-log session I did back in April, about one month and 1000mi after I installed the tune. Most of it is from cruising at various speeds. The 0 - 85mph (oops! ) blast at WOT starts at around frame 1200 (crosshairs) and ends at about 1300. The first plot is RPM vs speed to give you an idea of the driving conditions. I did all the fuel trim plots versus throttle position. To me, the LTFT behavior looks different than that on rtcat600man's car. I would have thought that they would be less variable. I am running a Vararam intake with the RX breather with the questionable check-valve in place. I plan to remove the check valve soon, or attempt to restore the OEM clean-side PCV line by modifying the Vararam. If I can make the mod work, then I'll do some new data-logs to see if anything changes. If I can't - or if I ruin the Vararam - I'll likely swap to a Roto-Fab CAI, so I can put the system back the way it should be run.
As of now, the car seems to be running OK, the only issue is that sometimes the breather gets some oil leaking from it. I suppose I wonder what effect the LTFTs are having w/r performance and fuel efficiency.
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08-30-2013, 12:53 PM | #12 |
Drives: 2010 RS Inferno Orange Metallic Join Date: Mar 2010
Location: Albany, Ga.
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da** wish I knew ho to read these things:
I going to use a innova and get some pics of it so far I'm running 5% on bank one and 3% on bank two LTFT Short term runs 0% untill you step in it.
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08-30-2013, 12:53 PM | #13 |
Drives: 2010 RS Inferno Orange Metallic Join Date: Mar 2010
Location: Albany, Ga.
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this is some pics from my innova
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Last edited by spyderbuddy; 09-01-2013 at 07:31 AM. |
08-30-2013, 02:00 PM | #14 |
Drives: Camaro 2SS/RS Ice Silver Join Date: Oct 2009
Location: Kuwait
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Fuel trims info means nothing when the car enters Power Enrichment mode. Only a wide band O2 sensor data at PE is dependable. Maybe the mV readings of the narrow band sensor could give an indication but again is not dependable.
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