Why is it that when the temperatures outside start to drop (anywhere from mid 60's and below) that I start running lean? When temps are around 75, I'm consistent at 11.4 but when it gets colder my AFR is 12.0. Any ideas/suggestions?
Why is it that when the temperatures outside start to drop (anywhere from mid 60's and below) that I start running lean? When temps are around 75, I'm consistent at 11.4 but when it gets colder my AFR is 12.0. Any ideas/suggestions?
2004 Silverado Crew Cab, forged iron 5.7, STS w/MP turbo, 10+ psi, FMIC, Tial 50mm BOV, Vic Jr, Snow performance meth, MTI Stealth cam .220/.220 .581/.581 115lsa, Comp chromoly pushrods, Yank TT3000 stall, LS1 Efans, 160 tstat, Trucool 40k trans cooler, 60# injectors, Walbro fuel pump, Patriot springs, Built 4l65E w/billet input & output shafts, Eaton posi, SD tuned...all installed by Klein North Automotive
Cooler air is denser.
Yup. I believe that is a drawback to the SD tune?
Gone, but not forgotten!
It should still be the same. Maybe a retune? I've run mine way down into the 20's and had the same readings.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
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Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
I haven't noticed any change to mine when it gets cold.
11.5 - 11.7 all temps?
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Kinda weird. I noticed this morning (65 degrees) that when I hit full boost, my AFR went to high 11's low 12's. During the day, with temps in the 70's or 80's, my AFR was in the low 11's. Not sure what's going on but I need to figure it out quick!
2004 Silverado Crew Cab, forged iron 5.7, STS w/MP turbo, 10+ psi, FMIC, Tial 50mm BOV, Vic Jr, Snow performance meth, MTI Stealth cam .220/.220 .581/.581 115lsa, Comp chromoly pushrods, Yank TT3000 stall, LS1 Efans, 160 tstat, Trucool 40k trans cooler, 60# injectors, Walbro fuel pump, Patriot springs, Built 4l65E w/billet input & output shafts, Eaton posi, SD tuned...all installed by Klein North Automotive
Again, its because the cooler air packs more O2 molecules into your cylinders while your injectors are still delivering the same amount of fuel. Thus changing your a/f ratio.
Do you notice more power? If you arent getting any detonation, dont worry about it.
MAybe there is some sort temp multiplier that was shut off in your tune accidentally?
peace
Hog.
97 GMC 2wd RCSB 5.7, s10 2700 footstall, Hooker 24621hkr LT's , 2.5" cats dual 4"pipes exit B4 pass. side tire, custom driveshaft 3.42 G80 FIPK MAF descreen GM/Mercruiser Marine intake manifold 29lb LS2(EV6) injectors Ed Wright PCM(best mod), LT4 KM 14.8@94mph 2.007 4000lbs 122mph
Yeah Jay--have Allen look at the temp multiplier tables in the tune. I know HPT has a section where (depending on IATS), it will automatically change your timing or AFR in relation to the temps...Originally Posted by hog
2000 ECSB 6.0L
TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's
if your not hearing any kr dont worry about it...
'13 silverado LT...stock
'11 lt 4x4 z71..tvs1900
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