Part throttle 100 KPA load -> 14.7 safe?

[LZeppelin513]

RIght now I can cruise at highish RPMs, 100 kpa load and not enter PE.

Is an AFR of 14.7 when at 100 kpa and rpm of say 3600 safe?

Should I change PE parameters so that it would normally be active under these metrics?

[robertisaar]

3600 RPM / 100kPa is a lot of airflow just to cruise....

what kind of TPS% is getting displayed?

you're either running with very little spark advance or you are fighting against a rather large load.

explains your fuel economy issues.

[LZeppelin513]

I didnt word that clearly. I mean, when I am tuning, I can "cruise" (hold throttle and either brake/ or uphill) at 100 kpa without going into PE at somewhat high RPM. Since no PE, my AFR is commanded at 14.7. I am just wondering if 14.7 AFR is is safe at a highish RPM like 3600 and 100 kpa load.

My TPS is something like 40% when 3600 rpm and 100 kpa, but PE doesnt come in until 60 %.
Should I lower PE tps threshold so that target AFR comes down to a safe range when high load, high rpm, part throttle "cruising" such as going up a long steep hill. Or is 14.7 safe??

Normal cruise with normal driving is around 40 kpa.

[robertisaar]

ah....

okay, that makes more sense now.

since you have a wideband, i would allow it to get into PE around 95kPa at the absolute latest, 90 is probably where i would look at for a good place to start. then just tune that in open loop. most certainly safer than when running it stoich. it's also a bit more realistic, since AFR most definitely effects flame speed, which will effect optimum advance.

[LZeppelin513]

OK great, thanks. What about lower RPMS like 2000? is it safe to run 14.7 at 100 kpa there? If so, what is a good RPM threshold at 90kpa or so to enter PE?

[robertisaar]

outside of idle RPM(to have a 90kPa idle.... woof), any?

i've run 1400-2000 at 90kPa with the torque converter locked in 3rd/4th and i definitely don't want PE getting engaged with the TCC locked, that's just asking for it to destroy itself. so i have my settings to the point of where PE and TCC lockup cannot occur at the same time. choose your window of safety, assuming you're running an auto. if manual, that specific restriction doesn't apply and the only item you'll have to worry about is the engine. in which case, i'd still say 95 at the latest regardless of RPM, but you'll have to make your own compromise between MPG, feel and durability.