And, now many engines come with different computer calibrations.
Late model engines overfueling at WOT
Moderator: Team
Re: Late model engines overfueling at WOT
http://www.fastchip.com/
SS/JA 4156
SS/JA 4156
Re: Late model engines overfueling at WOT
I know the company I work for seams to have many of its cars sooty after testing on the track, and this is with production powertrain so there is no excuse of it being an early prototype tune.
Paul
Paul
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Re: Late model engines overfueling at WOT
AE would do that if improperly tuned at high loads.Keith Morganstein wrote: ↑Sat Jan 13, 2018 8:36 am My ford mod v8 with OBD1 would push a bit of black smoke when first going to WOT, then clear up. Engine/car was abnormally fast for what it was.
Re: Late model engines overfueling at WOT
Been tuning GM EFI vehicles since 1985, I have never seen a calibration that adds fuel for high Intake Air Temps. They do back up the timing.
WOT Air/Fuel ratios in the high 11-1 range is fairly common for late model, stock GM vehicles.
Lean them enough (and you do nothing to prevent it) they will go into C.O.T. Mode to protect the cats. That lowers EGTs, won't melt the cats, or catch anything on fire. LOL
For carb guys, the previously mentioned AE fuel, is like the accelerator pump squirt from a carb.
http://www.fastchip.com/
SS/JA 4156
SS/JA 4156
Re: Late model engines overfueling at WOT
Had a brain fart. Just did a '93 LT1 Corvette chip today, and that one does have an A/F correction for Intake temp. Right now I can't think of another one that does. Sorry.
http://www.fastchip.com/
SS/JA 4156
SS/JA 4156
Re: Late model engines overfueling at WOT
What about coolant temp?
It's far more important if you're either towing or pulling up a long hill.
It's far more important if you're either towing or pulling up a long hill.
Re: Late model engines overfueling at WOT
Should I add that my Camry was sold new in Germany with free autobahn speeds so there is a possibility that Toyota programmed ECU to survive ten´s to hundered of kilometers of full throttle driving.Don't know;just quessing..
"when uncomptent order unwilling to do unnecsessary the probablity of failure is high"
Re: Late model engines overfueling at WOT
They all have fueling corrections for coolant temp. Mostly for Open Loop, and P.E. Mode (wide open throttle)
http://www.fastchip.com/
SS/JA 4156
SS/JA 4156
Re: Late model engines overfueling at WOT
The IAT correction has been available for quite a while, originally just spark but also fueling now. Ed pointed out a 93Lt1 having it, here is a 2011 ZR1 Vette. I have never seen one ADD fuel, as you can see this one takes away fuel with Intake Air Temp as it should be. Just for reference, a multiplier of 1 = no change, anything under 1 is taking fuel away. This(ZR1) table can have a maximum multiplier of 4(FFFFh) and minimum multiplier of 0(0000h).
As to the questions about overfueling at WOT, it doesn't overfuel with the factory cal to most extent. When it goes into cat save mode the AFR's can end up in the 10's, TO SAVE THE CATS.
Anything running at richer than stoich will put soot in the tailpipe on PUMP GAS.
The spark correction is like it looks, positive number adds timing, negative number takes timing away.
As to the questions about overfueling at WOT, it doesn't overfuel with the factory cal to most extent. When it goes into cat save mode the AFR's can end up in the 10's, TO SAVE THE CATS.
Anything running at richer than stoich will put soot in the tailpipe on PUMP GAS.
Code: Select all
Injector Flow Rate Multiplier Vs. IAT
Deg. C Mult.
-40 0.9994
-30 0.9994
-20 0.9994
-10 0.9994
0 0.9994
10 0.9994
20 0.9994
30 0.9994
40 0.9855
50 0.9714
60 0.9614
70 0.9534
80 0.9475
90 0.9424
100 0.9424
110 0.9424
120 0.9424
The spark correction is like it looks, positive number adds timing, negative number takes timing away.
Code: Select all
IAT Spark Advance Correction Vs. IAT Vs. Load
gm/cyl. Deg. C
-40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
0.08 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
0.12 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
0.16 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
0.20 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
0.24 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
0.28 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 -1.5 -2.5 -2.5 -2.5 -2.5 -2.5 -2.5 -2.5 -2.5 -1.5 -1.5 -1.5
0.32 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 -1.5 -2.5 -3.0 -3.5 -3.5 -3.5 -4.0 -4.5 -5.0 -5.0 -5.0 -5.0
0.36 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 -2.0 -3.0 -3.5 -4.0 -4.0 -4.0 -4.5 -5.0 -5.5 -5.5 -6.0 -7.0
0.40 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 -2.0 -3.5 -4.0 -5.0 -5.0 -5.0 -5.5 -5.5 -6.0 -6.0 -7.0 -8.0
0.44 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 2.0 1.0 1.0 1.0 0.5 0.0 0.0 0.0 -2.5 -4.0 -4.5 -5.5 -5.5 -5.5 -6.0 -6.0 -6.5 -6.5 -9.0 -10.0
0.48 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 3.0 2.0 2.0 2.0 1.5 1.0 0.5 0.0 -2.5 -4.0 -5.0 -6.0 -6.0 -6.0 -6.5 -6.5 -7.0 -8.0 -10.0 -11.0
0.52 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 3.0 2.5 2.5 2.5 1.5 1.0 0.5 0.0 -3.0 -4.0 -5.0 -6.0 -6.0 -6.0 -6.5 -6.5 -7.0 -9.0 -11.0 -12.0
0.56 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 3.0 2.5 2.5 2.5 1.5 1.0 0.5 0.0 -3.0 -4.0 -5.0 -6.0 -6.0 -6.0 -6.5 -6.5 -7.0 -10.0 -11.0 -12.0
0.60 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 3.5 3.0 2.5 2.5 1.5 1.0 0.5 0.0 -2.5 -4.0 -5.0 -6.0 -6.0 -6.0 -6.5 -6.5 -7.0 -10.0 -11.0 -12.0
0.64 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 3.5 3.0 2.5 2.5 1.5 1.0 0.0 0.0 -2.5 -4.0 -5.0 -6.0 -6.0 -6.0 -6.5 -6.5 -7.0 -10.0 -11.0 -12.0
0.68 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 6.0 3.5 2.5 2.0 1.5 1.0 0.0 0.0 -2.5 -4.0 -4.5 -5.5 -5.5 -5.5 -6.0 -6.5 -7.0 -10.0 -11.0 -12.0
0.72 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 6.0 3.5 2.5 2.5 1.5 1.0 0.0 0.0 -2.5 -4.0 -4.5 -5.5 -5.5 -5.5 -6.0 -6.5 -7.0 -10.0 -12.0 -12.0
0.76 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 8.0 4.5 3.0 2.5 1.5 1.0 0.0 0.0 -2.5 -4.0 -4.5 -5.5 -5.5 -5.5 -6.0 -6.5 -6.5 -10.0 -12.0 -12.0
0.80 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 9.0 6.0 3.5 2.5 1.5 1.0 0.0 0.0 -2.5 -4.0 -4.5 -5.5 -5.5 -5.5 -6.0 -6.0 -6.5 -10.0 -12.0 -12.0
0.84 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 9.0 7.0 4.0 2.5 1.5 1.0 0.0 0.0 -2.5 -4.0 -4.5 -5.5 -5.5 -5.5 -6.0 -6.0 -6.5 -10.0 -12.0 -12.0
0.88 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 9.0 7.5 6.0 4.0 3.5 2.5 1.0 0.0 -2.5 -4.0 -4.5 -5.5 -5.5 -5.5 -6.0 -6.0 -6.0 -10.0 -12.0 -12.0
0.92 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 9.0 8.5 6.0 5.0 4.0 2.5 1.5 0.0 -2.5 -4.0 -4.5 -5.0 -5.0 -5.0 -5.5 -5.5 -6.0 -10.0 -12.0 -12.0
0.96 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 9.0 9.0 6.0 6.0 4.5 3.0 1.5 0.0 -2.5 -4.0 -4.5 -5.0 -5.0 -5.0 -5.5 -5.5 -6.0 -10.0 -12.0 -12.0
1.00 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 9.0 9.5 5.5 5.5 4.0 2.5 1.5 0.0 -2.5 -4.0 -4.5 -5.0 -5.0 -5.0 -5.5 -5.5 -6.0 -10.0 -12.0 -12.0
1.04 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 9.0 9.5 5.5 5.5 4.5 3.5 2.0 2.0 -2.5 -4.0 -4.5 -5.0 -5.0 -5.0 -5.5 -5.5 -6.0 -10.0 -12.0 -12.0
1.08 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 9.0 5.5 5.5 4.5 3.0 2.0 2.0 -2.5 -3.5 -4.5 -5.0 -5.0 -5.0 -5.5 -5.5 -6.0 -10.0 -12.0 -12.0
1.12 10.5 11.0 11.0 10.5 10.5 10.5 10.5 10.5 10.5 10.5 10.5 10.5 10.5 10.5 8.5 6.0 5.5 4.5 3.0 2.0 2.0 -2.5 -3.5 -4.0 -5.0 -5.0 -5.0 -5.5 -5.5 -6.0 -10.0 -12.0 -12.0
1.16 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 9.5 10.0 8.5 7.0 3.0 3.0 3.0 2.0 2.0 -2.0 -3.5 -4.0 -5.0 -5.0 -5.0 -5.5 -5.5 -6.0 -10.0 -12.0 -12.0
1.20 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 9.5 10.0 8.5 7.0 2.0 2.0 2.0 2.0 2.0 -2.0 -3.5 -4.0 -4.5 -4.5 -4.5 -5.0 -5.0 -5.5 -10.0 -12.0 -12.0
1.24 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 9.5 10.0 8.5 7.0 2.0 2.0 2.0 2.0 2.0 -2.0 -3.0 -3.5 -4.5 -4.5 -4.5 -5.0 -5.0 -5.5 -10.0 -12.0 -12.0
1.28 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 9.5 10.0 8.5 7.0 2.0 2.0 2.0 2.0 2.0 -1.5 -3.0 -3.5 -4.0 -4.0 -4.0 -4.5 -5.0 -5.5 -10.0 -12.0 -12.0
1.32 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 9.5 10.0 8.5 7.0 2.0 2.0 2.0 2.0 2.0 -1.5 -2.5 -3.0 -4.0 -4.0 -4.0 -4.5 -4.5 -5.5 -10.0 -12.0 -12.0
1.36 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 9.5 10.0 8.5 7.0 2.0 2.0 2.0 2.0 2.0 -1.5 -2.5 -3.0 -3.5 -3.5 -3.5 -4.0 -4.5 -5.0 -10.0 -12.0 -12.0
Heat is energy, energy is horsepower...but you gotta control the heat.
-Carl
-Carl