PE Tables Help

[harvickgm]

i know that lowering your PE tables takes fuel away at WOT to lean it out. im using Tunercat for my slightly modded 93 TA, im using the formula tunercat supplies which is
14.7 / (1 + %Change vs. Cool/100 + %Change vs. RPM/100)

now if im using this correctly im going to show both my stock tables compared to my new tables that i did myself and would like some advice if i have done this right. any advice is good advice thanks guys:

Stock RPM
400---11.7
800---7.0
1200--12.5
1600--5.5
2000--6.3
2400--7.0
2800--8.6
3200--12.5
3600--12.5
4000--8.6
4500--8.6
5000--12.5
5500--8.6
6000--negitive 6.3

Stock Cool (Celcius)
-40--40.2
08---21.1
56---15.6
104--15.6
152--34.4

and after playing around, using the formula above, i got these numbers, but it seems like such a dramatic change in numbers, just wanted some points of views on what others thought

New RPM PE Change

400---11.7
800---7.0
1200--7.0
1600--5.5
2000--5.5
2400--5.5
2800--5.5
3200--5.5
3600--4.7
4000--3.9
4500--3.9
5000--3.9
5500--3.9
6000--3.1

New Cool (Celcius)

-40--40.2
08---21.1
56---10.9
104--10.9
152--17.6

let me know if im doing this wrong, i think i have it right, im trying to even it out across the RPM range to get about a 12.5 to 13.0 :1 AFR
OPINONS??????

oh yea, expecting car to be at operating temp and in closed loop, car runs a constant 185 to 190

[pcmforless]

You got the forumla right however theres no way the computer can actually achieve a desired AFR (thats all your setting) so the way to go about changing PE is to note where you are and change it until our where you need to be.

In other words. Desired is just that, desired.. You have to fool around to get actual.

[harvickgm]

so what your saying is im setting what i want but there is so much other input that the computer keeps adjusting it. i know there are other things in play here, but im trying to study up and learn on each table one at a time until i understand it. what i did as in tuning wise, did i get it right??
just curious if i was anywhere close

[pcmforless]

No,

What you did is set up the desired AFR. What you need to do is put the car on a wideband or at least look at the stock O2 and decrease PE vs RPM values if your richer than you want to be and increase the values if your leaner. Setting desired is about useless because the computer/car isn't calibrated no where near that accurately.

For instance.. to achieve a 13.0 AFR it wouldn't be strange to have a 8:1 desired AFR by that formula

[harvickgm]

ok cool,
ok at WOT i know the O2 range should be like 850 to 950, is there a chart that breaks this down into AFR?? or how should i determine the AFR??
im going to run it several times at WOT and use datamaster to watch the O2's while im at the track and see what they run all the way through my runs and RPM bands

[pcmforless]

880 is what I find works about best. you wont' know though unless you put it on a wideband

[harvickgm]

great, thanks for the input. yea, i know wide band is more precise, but i know i can at least get it close to that if i know what numbers i would like to see from my O2's, at least i would be close. thanks again man

[smoknta]

Do the O2's on most cars stay at a constant value at WOT or are they still bouncing around alot?

[Fastbird]

Do the O2's on most cars stay at a constant value at WOT or are they still bouncing around alot?

They tend to sit at more of a constant from what I've seen.

[harvickgm]

at WOT they sit alittle more but still bounce between 850-950, like PCMFORLESS and i were discussing is at WOT it depends on how much fuel the computer dumps is what your readings will be