PE enabled, but not activating (0411 8322)

**woody80z28** · 03-10-2020

One of the first things I did to tune my 8.1 was to enable PE by changing the delay timer from 60sec to 0sec and TPS enable from 90 to 70%.

I also noticed it didn't seem to do much, so I put a wideband in it. Well, at WOT it's showing me 14.8-15.1 on the wideband. I can see the TPS% at 99 in the log.

I am logging a couple more degrees spark (as I added), and the fan control I added is working - so I know the tune and flash process is functional.

There's gotta be something I'm missing here. Any idea what I could be doing wrong? BIN attached.

**steveo** · 03-10-2020

does your datastream output a flag for power enrichment active? is it being set?

**Fast355** · 03-10-2020

Originally Posted by woody80z28

One of the first things I did to tune my 8.1 was to enable PE by changing the delay timer from 60sec to 0sec and TPS enable from 90 to 70%.

I also noticed it didn't seem to do much, so I put a wideband in it. Well, at WOT it's showing me 14.8-15.1 on the wideband. I can see the TPS% at 99 in the log.

I am logging a couple more degrees spark (as I added), and the fan control I added is working - so I know the tune and flash process is functional.

There's gotta be something I'm missing here. Any idea what I could be doing wrong? BIN attached.

Set enable KPA to 55 and enable torque down to about 70%.

**woody80z28** · 03-11-2020

No flag, I'm logging with TunerPro via bluetooth. Limited PIDs.

MAP PE is at 55 already. I don't see anything in this XDF about "enable torque." There's enable TPS, and I've already changed that from 90 to 70. And my TPS is reading 99 in the log.

I have my PE EQ ratio set at the stock 1.240 for B3618 PE modified based on RPM
B3617 PE coolant temp and B3641 intake temp are both full of 0s, but it says they are added, not multiplied. So I don't think they would be causing an issue.

**woody80z28** · 03-14-2020

So I opened up HPTuners and a random 8.1 file I had downloaded and I do see the PE enable torque % is set at 100. MAP is set at 55, MAP hysteresis is 6% and torque hysteresis is 15%. Neither of those torque settings are visible in TunerPro. They are labeled 2414 and 2413 in HPT, but PE delay is 2415 in HPT and it's labeled B3608 in TPRT.

**woody80z28** · 03-22-2020

Bump. Anyone know a way to convert a .HPT file to .BIN perhaps?

**In-Tech** · 03-22-2020

I changed Power Enrich Enable Torque Threshold to 0% like in the Camaro/Transam. Pretty sure I got the checksums all correct.

Code:

CONSTANTS:
 
 
	Fuel Parameters
 
		Power Enrich Enable MAP                                   55 Kpa
		Power Enrich Enable Torque Threshold                     100 % Torq.

**woody80z28** · 03-22-2020

Originally Posted by In-Tech

I changed Power Enrich Enable Torque Threshold to 0% like in the Camaro/Transam. Pretty sure I got the checksums all correct.

Code:

CONSTANTS:
 
 
	Fuel Parameters
 
		Power Enrich Enable MAP                                   55 Kpa
		Power Enrich Enable Torque Threshold                     100 % Torq.

Thank you! I'll flash this tomorrow. May I ask, how did you do it?

**In-Tech** · 03-22-2020

Hello,
I opened the .bin file in TunerCat, saved it as a .cal(only option for saving) Then changed the value(Power Enrich Enable Torque Threshold) and re-saved with new name. I opened both .cal files in Hex Workshop and wrote down all the changes and line number in the .cal. Then searched the .bin in Hex Workshop and found the addresses of all the changes and altered them to match. Then saved the new .bin file.
It takes a while and even though it was only one value change, a lot of other things get changed. John's(TunerCat) software isn't free but is well worth it to me. If you open up the text file I added, you can see all the stuff available in his software. I'm not advertising just pointing out how much work goes into software, the free stuff and the pay stuff. Back in the eprom days it was quite a bit simpler, find the byte you wanted to change, alter it and correct the 16 bit checksum and go. Shoot, when I started(early 90's) there was no software and we were working straight in hex and had to burn a chip every time. Then affordable emulators came out(I had an xtronics pocketrom) and you could disable the checksum and hunt and peck in the area where it should be based on what you had disassembled(which is a shit ton of work).
-Carl

**woody80z28** · 03-22-2020

That is pretty awesome. I'm glad there are people out there smarter than me. Haha.
I've been tuning obd1 for about 10 years, and totally reliant on the work of others in $a1 and $od. I'm just now learning a little bit about hex while working on an obd2 adx for my bluetooth adapter.

**woody80z28** · 03-22-2020

Hmmmmmm... I just tested out the BIN, and with the PE EQ ratio set for 1.18, the wideband was reading just over 16:1! That's supposed to be about 12.5:1. Stock was 1.240, so there's no way it could be backwards right? Cause 1.18 lambda is about 16:1...

But the good news is, it does appear to be entering PE. Wideband was about 14.7ish at moderate throttle, then moved to 16:1 at WOT.

**Fast355** · 03-23-2020

Originally Posted by woody80z28

Hmmmmmm... I just tested out the BIN, and with the PE EQ ratio set for 1.18, the wideband was reading just over 16:1! That's supposed to be about 12.5:1. Stock was 1.240, so there's no way it could be backwards right? Cause 1.18 lambda is about 16:1...

But the good news is, it does appear to be entering PE. Wideband was about 14.7ish at moderate throttle, then moved to 16:1 at WOT.

Sounds like low fuel pressure, unmetered air leak or a dirty MAF to me or some poor WOT tuning masked by closed loop at WOT.

**woody80z28** · 03-23-2020

Maybe the factory tuning its really bad? Truck is stock, with a drop in filter and smooth intake tube. I've read something about a MAF reading incorrectly if the tube isn't the same diameter. Maybe corrugated vs smooth also makes a difference?

**LRT** · 03-23-2020

....

**woody80z28** · 03-23-2020

Interesting nugget about PE on an 8.1... I've been making comparison pulls up a mountainside headed out of town as a "dyno" but they are only taking about 20sec to go from 2000-5000 in 4th gear at WOT. I can't think of any place steeper to try and prolong that. Maybe I could try 5th.

I just flashed a PCM set to fail the MAF instantly and run on SD. I want to get that in today and try it if it stops snowing.

If it really is open loop activating and not PE, I recall a table for open loop EQ that can probably be purposed to work like PE.

I'd like to try your bin as well. Can you give a hint of what's done to it? Just in case it's "not defined" in the xdf.

Thanks