TT_Vert

iTrader: (12)

im trying to lean out my car at WOT from 3600-6200 RPMS. It seems im between 95-100 KPA entire run and .68-.72 g/cyl in this rpm range based on past historgrams of 1/4 mile runs i've done. I was trying to find a way to lean out my PE but only at those rpms at a given load (say over 90kpa) not the entire PE range. I dont want to have the car run leaner any time i enter PE at between 3600-6200 rpms (Unless it wont hurt if of course). Basically im just looking at the easiest/best way to lean a car when WOT between 4400-6200 anything above 90 or so KPA.

It seems to me that:

modifying IFR (if it'd even work in PE) would modify the flow rate from 80kpa up which i think might be too broad a range to lean it out)
and
modifying PE would affect my fueling ANY time I go into PE not just the higher loads that I see at the track. Again leaning out more then just my higher map values.
Original PE:

modified PE:

Thanks
dave

HumpinSS

iTrader: (1)

You can run a leaner mixture as soon as you enter PE just as long as you arent pulling any timing due to KR. Modifying your IFR talbles applies fueling accross the board and is counter productive for leaning anything out as i will take more of a recuction in PE to acheive the desired AFR.

Lean is good as long as no knock is present. If your IFR is stock and everythign else hasnt been tinkered with 14.7/1.16=12.67:1 AFR (this should absolutely be verified with a WB). 12.6 is pretty safe on the street and still leaves room to be leaned out a litte more.

Do you have any AFR charts from dyno runs. That would also give you more insight as to what is going on with your fueling.

TT_Vert

iTrader: (12)

yeah i have dyno afrs, thats where im getting my commanded afr vs. actual afr and modifying accordingly. im at 12.2@6k and 13.0@3600. It sloped down from 3600-6k mostly past 4400 though, so i wanna lean it out at aroud 4400 about 3/'4 point or so

dave

TT_Vert

iTrader: (12)

DYNORUN.002: 77.40°F 29.53in-Hg Humidity:32% SAE:1.00 Average Gear Ratio:54.78

s RPM x1000 hp ft-lbs Air/Fuel
0.20 2.80 N/A N/A 14.68
0.47 2.90 179.49 325.07 14.70
0.65 3.00 185.58 324.89 14.66
0.83 3.10 192.23 325.68 14.52
1.02 3.20 198.62 325.99 14.16
1.20 3.30 204.31 325.17 13.79
1.38 3.40 210.61 325.34 13.49
1.56 3.50 217.35 326.16 13.35
1.75 3.60 224.55 327.60 13.28
1.93 3.70 232.15 329.53 13.23
2.11 3.80 239.87 331.52 13.17
2.28 3.90 248.33 334.42 13.12
2.46 4.00 256.70 337.05 13.09
2.63 4.10 264.59 338.94 13.06
2.81 4.20 271.27 339.23 13.05
2.98 4.30 278.09 339.66 13.02
3.16 4.40 284.64 339.76 12.98
3.33 4.50 291.82 340.59 12.89
3.51 4.60 298.37 340.67 12.81
3.69 4.70 304.34 340.09 12.77
3.86 4.80 309.51 338.67 12.74
4.04 4.90 313.81 336.37 12.68
4.22 5.00 319.90 336.03 12.61
4.40 5.10 323.40 333.05 12.54
4.59 5.20 327.13 330.42 12.49
4.77 5.30 330.71 327.73 12.43
4.97 5.40 329.39 320.38 12.35
5.16 5.50 329.21 314.38 12.30
5.36 5.60 326.71 306.42 12.31
5.57 5.70 322.39 297.06 12.31
5.79 5.80 320.23 289.98 12.29
6.00 5.90 320.73 285.52 12.26
6.22 6.00 319.51 279.69 12.18
6.45 6.10 318.04 273.84 12.12
--------- --------- --------- --------- ---------
MAX: 6.45 6.10 330.71 340.67 14.70
MIN: 0.20 2.80 179.49 273.84 12.12

HumpinSS

iTrader: (1)

Do this and see what happens

take 14.7/your current AFR. This will give you the actual multiplier then

take 14.7/ desired afr and get that multiiplier

Subtract the two and take the difference away from your current PE value at those points

P Mack

iTrader: (6)

Your ltrims are zeroing out right? If you can't lean out the combinations of load and rpm you want using pe, you could always try changing the maf tables in that area.

HumpinSS

iTrader: (1)

Almost forgot what are the values in your Open loop F/a table looking like at operating temp and those RPM's. If those vales are richer than the PE values the PCM will use that

TT_Vert

iTrader: (12)

open loo (seems 12.94 is about the leanest commanded at WOT up top:

P Mack

iTrader: (6)

The only 2 things i can think of that could be complicating things are cat overtemp protection and the PE add vs ECT table, but i doubt that is your problem. Other than that the pcm is mostly using MAF, IFR, and PE tables to come up with a pulsewidth.