That means the rom you are looking at doesn't have the tephra patch in it.

 

Are you copying the info from mrfreds rom into your tephra rom?

If your just opening mrfreds rom it does not have the tephra patch, you just need to copy the info from his O2 patch tables into your tables in your own tephra rom.

 

aahhhh woops. thanks

 

I seem to be having problems with this patch. I am using a ZT2

When I tried it the car would show a leaner and leaner AFR and then sometimes it would even stall.

When I try logging the AFR from the ZT2 through the ECU W/O this patch, it would idle and drive fine and show an afr of 14.7 - 15.1 or so. I might have a slight exhaust leak but it is only effecting the afr a very small amount.

Then when I switch to this patch, it shows very lean afr and then runs poorly.

Edit -

I just re-read this thread and saw another with my same problem. I am going to try and copy the map over one more time and triple check that everything is correct. Flash it again and hope it works. I'll report back.

 

I noticed that I already have 8409 in MUT 3C. I know MUT 12 is used for EGR temp by default (just by looking at evoscan). Not sure if this is a modification I made, or tephra made, but is there anything that needs to be done to get this working off of that address?

... if its too complicated and I should shut my yap and flip the two just let me know

 

This patch needs to be copied into your existing tephra ROM. Assuming you've done that, and its still not working, can you try turning off the patch using the "on/off" setting that I provide with the patch.


That's an easy one to fix. There is no EGR temperature. That EGR Temperature line can be deleted from the EvoScan "Data.xml" file.

 

Hamish could delete it, that it does not confuse more people.

 

FYI, just on a base run I got an average of 0.144230631 difference (leaner for analog) in AFR between serial and analog on the UEGO. This was just after a cold start and a couple of blips of the throttle. bL will likely need to be adjusted for a UEGO.



I'm getting a horrible ground loop-ish noise though for no good reason. Going to look for a better power source and ground as well as trying to choke the power/ground (makes the noise regardless of the analog wire being in use or not), then go for a longer drive/comparison. I'm hoping the sensor isn't grounded on the exhaust causing the loop though

 

mrfred,

Just need a quick clarification.

1. We just need to wire the rear O2 to the wideband output. Right?
2. Am I correct with the assumption that turning on the "wideband closed loop" will use the ADC value from the wideband (and your narrowband sim) for controlling closed loop and turning it off will use the front O2 signal?
3. If I want a richer idle and cruise, I can achieve that by changing the fuel map on the idle and cruise corresponding areas. Right?

I am sorry if this is redundant or obvious. Just want to verify that I understood correctly.

 

Yep, that's how it works. It also has the rear O2 sim, and its always running. What wideband are you using?

 

Is the on/off value a boolean 1/0 or is it 1 (on) 255 (off) ?

 

boolean

 

Awesome work! I asked for clarification to see if it was as I thought. Too good to be true and it is true.

I am using an LC-1, currently using the serial port to log in evoscan and one of the ouputs (forgot which one) with the 9-17 AFR resolution on my Blitz iColor. Do you recommend using a different ouput for the display and logging? Or... One can be used for both as they are displaying the same AFR resolution?

Also, I got to give you props on the clever way to control closed loop with the wideband and a sim in the code.

I have another N/A (Very high compression) car and I use the LC-1 Narrowband to control closed loop but to around 13.5-14 instead of 14.7 -15.2 because it was knocking like crazy on tip-in (even adjusting the percentage for that on the ECU). All I did was to simulate the 0.1 to 1 VDC on the LC-1 but to be sensitive at around ~13.2-14 instead of the original AFR range and to adjust the target volt for "stoich" on the ECU to fine tune it. Woks like a charm!

 

I guess the important advantage to controlling closed loop with a wideband using this method is that the AFR can be varied as a function of RPM and load. Just wanted to mention that. :-)

 

Agreed!

I will installing this mod tomorrow morning along with the GM IAT and the harness for Tephra Mod. Just need to load the modded bin and put back the radio, glove compartment, etc.