LT1 $EE PE AFR settings

[Terminal_Crazy]

How is the target PE AFR actually calculated for 95 Camaro LT1 $EE in TunerPro.

I've got 3 different versions and none seem to match up



Thanks
Mitch

[kur4o]

It is compicated.

Here is the formula

$FFFF*($93/($80+PEvsRPM+PEvsCOOLANT))=$XXYY

[$XX]/10=PEAFR

It is all in hex, so you need a hex calculator.
The XX result is converted to decimal and divided by 10 and you got PE target at given Rpm and temp.

[steveo]

in my eex xdf, i wrote:

AFR = PE AFR Base (usually 14.7:1) / ( BOTH PE TABLES ADDED - 1)

is this not reasonably accurate? always seemed pretty good to me. also tunercat has similar documentation.

[Terminal_Crazy]

in my eex xdf, i wrote:

AFR = PE AFR Base (usually 14.7:1) / ( BOTH PE TABLES ADDED - 1)

is this not reasonably accurate? always seemed pretty good to me. also tunercat has similar documentation.

Thanks steveo, just wanted confirmation. I've got a slightly different info from t'internet.
Kur4o: Concise answer but a little deeper than i required.


OK Bought a milling machine to cut the manifold. Done that. Initial test looks like the split on BLM's changed sides... but they still swap around.

My AFR guage doesn't match BLM's. idles around 15-16 AFR. BLM's at 120-130 . LO2 sits at 750mV for 7 mins the other sits around 4mV. New O2's to go in. PE showing around 16-18 .



Thanks
Mitch

[steveo]

widebands and narrowbands definitely dont read the same at very low airflows

probably because there is a ton of flutter, and their response rates are very different

id actually trust trims more than wideband at idle

[Terminal_Crazy]

widebands and narrowbands definitely dont read the same at very low airflows

probably because there is a ton of flutter, and their response rates are very different

id actually trust trims more than wideband at idle

Replaced the 02's & knock sensor again just for fun.
AFR Guage matches the O2's but output appears different when read by EEHack....
Idle: BLM's 119_128... AFR 14.5-15 EEHack is showing 17.0
PE O2's read 850-880mV EEHack is showing 14.7

Wideband reads 22.39 at power on & 7.45 until car fires up. Pretty close to full range.

I did recalibrate the LC2 Wideband a few months ago but need to check output settings. Steveo mentioned narrowing the range but i'm pretty certain i didn't alter it from the std 0-5V output.


Steveo: Can i see the actual value of the AC Pressure anywhere?


Any suggestions.


Thanks
Mitch