i feel stupid for asking this
02-12-2007, 04:37 PM
#1
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i feel stupid for asking this fuel trims
ltft %
stft %
whats a good range to stay in?!?!?
i haven't gone wot in the car to check the ltft that i have set up right now, but it is averaging 12-14%.
school me!
ltft %
stft %
whats a good range to stay in?!?!?
i haven't gone wot in the car to check the ltft that i have set up right now, but it is averaging 12-14%.
school me!
02-12-2007, 06:32 PM
#2
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Usually I've heard you want to keep the LTFT's between +3 to -3. My car seems to like the more negative. I've also heard if your at WOT the LTFT should be at 0, since your in PE.
02-12-2007, 06:33 PM
#3
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WOW - that's high... that means your car is running lean, and the PCM is adding that much more fuel to get the AFR at cruise to be at 14.7...
yeah, I've heard ranges of -4 to +4, -3 to +3, -2 to +2... ideally you want to get the LTFT's as close to 0 as possible during cruise - they will still fluctuate a little above and below, it's not a perfect world, but the closer they are around 0, the better... and you want them to lock at 0 during WOT.
so it sounds like you need to add some fuel back in, to get those LTFT's down.
I don't know what you're using, but I know in the Predator you adjust the Injector Slope to do this... like mine for instance, after I installed my CAI, I was at about +8 on my LTFT... so using the Predator I went -6% on injector slope and it brought them right in line.
yeah, I've heard ranges of -4 to +4, -3 to +3, -2 to +2... ideally you want to get the LTFT's as close to 0 as possible during cruise - they will still fluctuate a little above and below, it's not a perfect world, but the closer they are around 0, the better... and you want them to lock at 0 during WOT.
so it sounds like you need to add some fuel back in, to get those LTFT's down.
I don't know what you're using, but I know in the Predator you adjust the Injector Slope to do this... like mine for instance, after I installed my CAI, I was at about +8 on my LTFT... so using the Predator I went -6% on injector slope and it brought them right in line.
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06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
Last edited by 06MonteSS; 02-12-2007 at 06:40 PM.
02-12-2007, 06:39 PM
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Dont worry about the STFTs so much, you know if the computer is starting to settle in if those start staying negative.
My car seems to be really snotty at +5 LTFTS and maintains it, before doing the ole LS1 -3 LTFTS trick it would be snotty at first, settle in and get doggy with negatvie LTFT's For whatever reason these things are like my 04' colorado was, it turded up going with - trims.
12-14% lol yeah little maf scaling needs to be done...
This is why most of us dont dick with mail order tunes...
My car seems to be really snotty at +5 LTFTS and maintains it, before doing the ole LS1 -3 LTFTS trick it would be snotty at first, settle in and get doggy with negatvie LTFT's For whatever reason these things are like my 04' colorado was, it turded up going with - trims.
12-14% lol yeah little maf scaling needs to be done...
This is why most of us dont dick with mail order tunes...
02-12-2007, 06:43 PM
#6
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Hey Badd... mine got doggy/bogging with all -trims too, and I found out why from Mike at Diablosport... basically, it's because we made the car too rich - I had to jack mine back up a couple % because I was in all negatives...
"Ahhh...shifting. When you look at these logs, monitor your engine load. Engine load is a major determining factor in shift settings. If the slight change in inj. slope is causing an excessive rich condition, and the car is losing power as a result, it will change the load and thus the tranny will react differently."
you can read about my whole issue I posted here:
http://ls7gto.com/forums/showthread.php?t=131299&page=2
"Ahhh...shifting. When you look at these logs, monitor your engine load. Engine load is a major determining factor in shift settings. If the slight change in inj. slope is causing an excessive rich condition, and the car is losing power as a result, it will change the load and thus the tranny will react differently."
you can read about my whole issue I posted here:
http://ls7gto.com/forums/showthread.php?t=131299&page=2
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2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
02-13-2007, 08:53 AM
#7
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so, did you "experiment" Area?? What'cha find??
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06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
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02-13-2007, 10:02 AM
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it was raining, now there is snow in the ground. when this crap clears out i'll experiement with it. not a big fan of trying to get the fuel trims reset when there is snow on the ground
02-13-2007, 06:48 PM
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Regular driving sets the trims better IMHO. Just need few rolls into WOT to cover most different g/cyl cells.
My car is stupid with amount of torque it has right now at +3 and it warmed up inte mid 20's.
I can be rolling at 30 give it enough to downshift to 2nd (not 1st) and roll into it about 3/4 throttle and it blows the tires off on the cold salty roads like no other, the speedo pegs to like 80 and the front slides to the right bwhahahah
My car is stupid with amount of torque it has right now at +3 and it warmed up inte mid 20's.
I can be rolling at 30 give it enough to downshift to 2nd (not 1st) and roll into it about 3/4 throttle and it blows the tires off on the cold salty roads like no other, the speedo pegs to like 80 and the front slides to the right bwhahahah
02-13-2007, 07:52 PM
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Originally Posted by BADDLS1SS
Regular driving sets the trims better IMHO. Just need few rolls into WOT to cover most different g/cyl cells.
My car is stupid with amount of torque it has right now at +3 and it warmed up inte mid 20's.
I can be rolling at 30 give it enough to downshift to 2nd (not 1st) and roll into it about 3/4 throttle and it blows the tires off on the cold salty roads like no other, the speedo pegs to like 80 and the front slides to the right bwhahahah
My car is stupid with amount of torque it has right now at +3 and it warmed up inte mid 20's.
I can be rolling at 30 give it enough to downshift to 2nd (not 1st) and roll into it about 3/4 throttle and it blows the tires off on the cold salty roads like no other, the speedo pegs to like 80 and the front slides to the right bwhahahah
my car is pullin like a freakin train right now. it has never run this good before, even on 91 octane. no knock. have to manhandle the wheel to get it to stay straight at a 65 punch {thanks kc for the massive amounts of salt}
the ltft at WOT is 11.7 will NOT go below that. i may go out on the highway and do a log run with it and see what happens
ambient temp is 22
IAT is 23 degrees
BTW, BADD. i see your snow and raise you
02-13-2007, 08:20 PM
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tommrow i will rebuttle with my snow wagon! We got another 4" today, but im sicker than a ****** animal right now so i didnt go to work today.
Il park it ina snow bank or something lol then let the blizzacks dig it out.
Il park it ina snow bank or something lol then let the blizzacks dig it out.
02-13-2007, 09:23 PM
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Originally Posted by BADDLS1SS
tommrow i will rebuttle with my snow wagon! We got another 4" today, but im sicker than a ****** animal right now so i didnt go to work today.
Il park it ina snow bank or something lol then let the blizzacks dig it out.
Il park it ina snow bank or something lol then let the blizzacks dig it out.
lol
i can dig out pics of my 280 buried roof high
hehehehe
i was sick last week
it sucks
the trims still bother me
02-13-2007, 10:08 PM
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This is what we had last week - plows did a final scrape today, now we get hit again ... snow banks were over the top of the doors.
Monte kept motoring - fun pulling out in front of 4WD's and making them wait for me for a change.
Buffalo might have got hit harder .. I saw some dude on NBC Nightly News shoveling like 3' of his roof today in New York.
Monte kept motoring - fun pulling out in front of 4WD's and making them wait for me for a change.
Buffalo might have got hit harder .. I saw some dude on NBC Nightly News shoveling like 3' of his roof today in New York.
02-14-2007, 10:10 AM
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ya know, being that it is below 22 degrees here. im thinking the car is going to be adding fuel anyways. my dsm's in the past acted wierd in the winter time. got me.
