Fuel Trims while at the drag strip doing a data log - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

rtcat600man · 08-29-2013, 07:01 PM

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.

911medic · 08-29-2013, 07:30 PM

Nice! I like data.

Do you run a breather?

rtcat600man · 08-29-2013, 08:08 PM

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.

376LS3 · 08-29-2013, 08:09 PM

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 (WOT) Of course its going to flatten out because they are no longer active.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?

rtcat600man · 08-29-2013, 08:20 PM

Quote:

Originally Posted by 376LS3

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 (WOT) Of course its going to flatten out because they are no longer active.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?

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.

376LS3 · 08-29-2013, 08:35 PM

Oh, ok, my bad. I though you were bragging that your trims were 0% during the pass. Im sorry!

rtcat600man · 08-29-2013, 08:56 PM

Quote:

Originally Posted by 376LS3

Oh, ok, my bad. I though you were bragging that your trims were 0% during the pass. Im sorry!

NP...........Thanks for understanding and taking the time to say so........

ChadG · 08-29-2013, 10:51 PM

Quote:

Originally Posted by rtcat600man

NP...........Thanks for understanding and taking the time to say so........

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.

pgustavson · 08-30-2013, 07:12 AM

Quote:

Originally Posted by 376LS3

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?

Well that's something I didn't know when posting in the other thread.

I'm still working on the screen shots. I'll post them up later, on my lunch break.

MikeOD · 08-30-2013, 08:17 AM

Quote:

Originally Posted by 376LS3

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?

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.

pgustavson · 08-30-2013, 12:02 PM

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.

spyderbuddy · 08-30-2013, 12:53 PM

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.

spyderbuddy · 08-30-2013, 12:53 PM

this is some pics from my innova

TriGun · 08-30-2013, 02:00 PM

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.

08-29-2013, 07:01 PM	#1
rtcat600man having FUN now 13.66@101 Drives: 2010 2LT IOM Join Date: Nov 2009 Location: Clarkston, Michigan Posts: 9,230 View My Garage	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. Attached Images __________________ MY BUILD 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
911medic Drives: 2012 SIM 2LT/1970 Camaro Join Date: Nov 2012 Location: Near Minneapolis, MN Posts: 1,578	Nice! I like data. Do you run a breather? __________________ All bleeding stops eventually -- 2012 2LT Auto w/sunroof -- My journal thread Roto-Fab Intake & W/W Relocate Kit -- ADM Race Scoop -- Dynomax VT Axle-Back Exhaust -- Vitesse Throttle Controller RX Catch Can -- Drake Bowtie Delete -- JacFab Radio Face Cover -- LED Fog Lights -- LED Dome/Trunk/Plate Lights -- Gen5DIY Dash ABL -- Diode Dynamics Cupholder Lighting Wishlist: ACS T5 Splitter -- Hood Vent Mod -- Footwell/Door Pull/Homelink Button Lighting

08-29-2013, 08:08 PM	#3
rtcat600man having FUN now 13.66@101 Drives: 2010 2LT IOM Join Date: Nov 2009 Location: Clarkston, Michigan Posts: 9,230 View My Garage	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. __________________ MY BUILD

08-29-2013, 08:09 PM	#4
376LS3 Eh, that'll happen Drives: 2010 2SS Join Date: Apr 2012 Location: Mesa, Arizona Posts: 1,841	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? __________________ 2010 Camaro SS LS3 - No Modz

08-29-2013, 08:35 PM	#6
376LS3 Eh, that'll happen Drives: 2010 2SS Join Date: Apr 2012 Location: Mesa, Arizona Posts: 1,841	Oh, ok, my bad. I though you were bragging that your trims were 0% during the pass. Im sorry! __________________ 2010 Camaro SS LS3 - No Modz

08-30-2013, 12:02 PM	#11
pgustavson Stop writing "vert", ffs! Drives: 2011 2LT Convertible Join Date: Feb 2012 Location: Gambrills, MD Posts: 1,341 View My Garage	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. __________________ Vararam \| Vmax Ported TB \| Ported IM \| Vmax Black ICE-olator

08-30-2013, 12:53 PM	#12
spyderbuddy Drives: 2010 RS Inferno Orange Metallic Join Date: Mar 2010 Location: Albany, Ga. Posts: 3,398 View My Garage	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. __________________ PCP Hideaway Headlight Covers, BBK Headers & High Flow Cats, ZL1 Add-ons Wicker Bill, TL1/ZL1 Hood Insert, Gen5 DIY Frameless Mirror, ABL Dash Lighting an My link Navigation, Blacked out Rear Bowtie, all Sylvania led Turn Signals, Ceramic Window Tint By Nicks, MBRP Exhaust tips, GEN5 DIY Virginia Legal DRL Harness, Painted Brake Calipers, Vittesse Throttle Controller, Heritage Grill, Diode Dynamics Led Lighting, Manual Shifter Boot, Paddle Shifters, CNC Throttle Body, Trifecta Tune, RX Catch Can & Breather, Trunk Black out and Side Grills, Chevorlet door Sills.

08-30-2013, 12:53 PM	#13
spyderbuddy Drives: 2010 RS Inferno Orange Metallic Join Date: Mar 2010 Location: Albany, Ga. Posts: 3,398 View My Garage	this is some pics from my innova Attached Images __________________ PCP Hideaway Headlight Covers, BBK Headers & High Flow Cats, ZL1 Add-ons Wicker Bill, TL1/ZL1 Hood Insert, Gen5 DIY Frameless Mirror, ABL Dash Lighting an My link Navigation, Blacked out Rear Bowtie, all Sylvania led Turn Signals, Ceramic Window Tint By Nicks, MBRP Exhaust tips, GEN5 DIY Virginia Legal DRL Harness, Painted Brake Calipers, Vittesse Throttle Controller, Heritage Grill, Diode Dynamics Led Lighting, Manual Shifter Boot, Paddle Shifters, CNC Throttle Body, Trifecta Tune, RX Catch Can & Breather, Trunk Black out and Side Grills, Chevorlet door Sills. Last edited by spyderbuddy; 09-01-2013 at 07:31 AM.

08-30-2013, 02:00 PM	#14
TriGun Drives: Camaro 2SS/RS Ice Silver Join Date: Oct 2009 Location: Kuwait Posts: 205	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.