Don't know how much help I'll get but here is the question.

I've pretty much got all my LTFT at 0 +/-1 during for normal driving and the AFR is reading a nice steady 14.7 on the wideband.

However now I'm trying to adjust the WOT and the AFR reads fine from the wideband showing the 14.7 till WOT condition is met and it drops to 11.3 but when I get to about 5.5-6k RPMs it drops to 10.1. I also noticed the commanded AFR drops from 11.3 to 10.1 even though I have it set to 11.3 on HPT. What additional tables are forcing this change from 11.3 to 10.1? My hunch is to adjust the MAF in the upper frequencies some more but before I try that I'd figure I'd get some input first.......

 

The COT table messes with commanded fuel, and will change it under heavy throttle conditions after a few seconds.

 

MAF table.

flat line your PE and re-do the maf table. you'll be set after that..

1.25PE=12.0AFR

 

Look at your logs....Where it starts to go into the 10's is where you should cut back on the maf slightly...but using the afr correction should do the trick

 

What changes should be made to this to help?

This was the first thing I did before adjusting the MAF table for 0 LTFTs. Though I adjusted the table while in Closed Loop. Should I have been doing this in Open Loop?

 

If you have no CAT on the car, then set adders to 0.00, and raise the Temp threshholds. If using a highflow cat, leave multipliers and raise temp threshholds.

 

check what your piston protection is set at too.

 

I'll try raising the temperature thresholds, but I'm on a stock cat, though I recently had the wideband put in, lots of pounding and some welding going on. No CEL for the #2 O2sensor though, so I'm assuming the cat is ok...

Are you thinking the #4 piston is gonna blow so this table kicks in? Awwww man I hope not.....

Your just full of good news

 

cot, and PP dump fuel.

 

If your cat clogs, then your rear 02 won't throw codes though. And that rich of an AFR will clog a cat fast.

Some people set it to 8000, but I kept mine right at 3,600. He should be seeing if the enrichening happens at the Piston protection RPM right?

 

Does it help much? I see a lot of tunes without them...I personally have mine set at I think 4000 rpm...what does it do just make the car run richer?

 

it brings in extra fuel to drop cylinder temps...factors off IVT iirc.

 

With a clogged cat I should see other symptoms such as hesitation or some loss of power correct.

Since Psykostevo has his set to 3600 this would mean that there are 2 conditions that must happen to change the commanded AFR, 1-if I have reached the Piston Protection RPMs, and 2-if the IVT is reached. which is still telling me that something is wrong. Or did I miss something.

Hmmm gives me a lot to look at in my logs. I'll probably have to run another log so I can see the valve temps. I'll have to find out if I can log that sensor or if I already have it logged.

thanks all this has been very helpful you guys rock....... I hope its just an adjustment of the COT....

 

Yeah, if your CAT was clogged you would be experiencing more problems and lots of power loss.

 

ivt will hit at random times. mainly sitting at a stop light

 

hmm...... if IVT is random then it's back to adjusting the COT tables. Well I hope adjusting the COT temps keeps the commanded AFR at 11.3. If not I'll just cut the MAF in the upper freqs, and see if the commanded AFR changes. If not I'll be back with questions about the multiplier tables that adjust PE...... I mean how many could there be??

 

cot is shut off. along with PP.

i know what is causing it. im just too lazy to do anything about it.

 

Is that the default setting? disabled? Damn wish I had my laptop with me....

It's probably something simple but hard to explain? Now I gotta figure out how to grab that carrot dangleing in front of me while my hands are tied..........

 

nope. my issue comes from maf and ve blending. i set the dynamic to 1500 disable.

 

Ohhhhhhhhhhhhhh, why does that number sounds familiar, I'm recalling something from the HPT forums. I'll have to down load the latest version of HPT if I remember right. Looks like your sure this will fix it?..........Then I'll do this first then.....

 

its been a long time, but if i remember, PP will dump a considerable amount of fuel past that rpm.
I have mine set to 7000

 

Well adjusting the COT adder and Dynamic Airflow enable/disable helped to bring it to 11.1 instead of 10.1. Adjustment of PP did nothing. I'll do some more fine tuning on the MAF and I should be ready to tackle the timing next weekend.... Thanks for your help guys..

 

No problem, it's an easily overlooked problem. You car should feel a lot better with the new AFR.