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cjperformance · 09-20-2021, 08:02 PM

Fixing the Procharger Tune... just an update for folks who may be DIYers and are interested in knowing more detail.

Got wideband installed this last weekend.

Watched 9,000,000 videos, and read 10,000 forum posts. Turned off the stuff, did the things, and tweaked the junk.

All in all... AFR was off by about 5-8% across the board from the Procharger tune.

Long story short, I tuned the MAF Freq table. It is MAF only tune from Procharger. It looks pretty well dialed in on fuel right now after that according to the wideband. Within 1% for most of the range.

I can post some log files and/or tune files if anyone wants that stuff.

I didn't find the magical 100 HP unicorn though.

I did find an issue with Power Enrichment that I haven't addressed yet. I'm getting around .85 EQ Ratio Commanded for around 3,000 to 5,800 RPM at WOT and then EQ Ratio Commanded goes up to 1.0 at around 5800 RPM up to redline.

Have some associated Knock Retard at WOT due to this...

so tomorrow going to tweak the Enable Torque table with a lower values for 4800 RPM and up. I think this is a (not so) simple math error, that I would imagine should have been accounted for in the tune I was provided by Procharger. The amount of enrichment seems about right. For the most part at WOT, it was commanding around .85 lamda, and after my tune job... pretty much doing what was commanded.

I can't feel any seat-of-the-pants power from my AFR changes yet, at least not the 100 horses I'm short on. So I'll probably look at timing next.

Still feels squishy in the mid-rpm range... Torque tables and all that "seem fine", by which I mean there does not appear to be any cases where spark or throttle is being affected by torque calculations. Driver seems to be in control for the most part for Predicted Axle Torque source too, which I think is what matters?

Very interested in seeing some "good" tunes so I know what kind of ball park values I'm looking for.

There were lots of tweaks in timing between Procharger and stock. Still deciphering what's good and what's not. Not just the base tables, but modifiers for humidity and other such things. Still working through learning all of that.

Procharger also modified the SOI and CAM timing too. It looks like the PC tune altered cam timing in the low and mid range to remove cam retard. This is mostly at the part throttle and low rpm, probably for gas milage. So I dont think that's the cause of the part throttle slushiness now, but could be.

Last, my boost gauge is telling me I'm seeing slightly less boost than I think I should be seeing. On one pull I was only seeing 4.4 PSI, and on another I was seeing 6.6. I was thinking it should be much higher than that, over 7 PSI... It was high 80's today, with moderate humidity... Could be that the boost gauge just doesn't read quickly enough to catch "peak"... Prob know more once I get my 3 bar MAP delivered and installed.

Hope someone finds this useful. I'll keep posting as I make more changes this week

09-20-2021, 08:02 PM	#67
cjperformance Drives: 2017 Camaro SS 50th Anniversary Join Date: Apr 2021 Location: Missouri Posts: 950	Fixing the Procharger Tune... just an update for folks who may be DIYers and are interested in knowing more detail. Got wideband installed this last weekend. Watched 9,000,000 videos, and read 10,000 forum posts. Turned off the stuff, did the things, and tweaked the junk. All in all... AFR was off by about 5-8% across the board from the Procharger tune. Long story short, I tuned the MAF Freq table. It is MAF only tune from Procharger. It looks pretty well dialed in on fuel right now after that according to the wideband. Within 1% for most of the range. I can post some log files and/or tune files if anyone wants that stuff. I didn't find the magical 100 HP unicorn though. I did find an issue with Power Enrichment that I haven't addressed yet. I'm getting around .85 EQ Ratio Commanded for around 3,000 to 5,800 RPM at WOT and then EQ Ratio Commanded goes up to 1.0 at around 5800 RPM up to redline. Have some associated Knock Retard at WOT due to this... so tomorrow going to tweak the Enable Torque table with a lower values for 4800 RPM and up. I think this is a (not so) simple math error, that I would imagine should have been accounted for in the tune I was provided by Procharger. The amount of enrichment seems about right. For the most part at WOT, it was commanding around .85 lamda, and after my tune job... pretty much doing what was commanded. I can't feel any seat-of-the-pants power from my AFR changes yet, at least not the 100 horses I'm short on. So I'll probably look at timing next. Still feels squishy in the mid-rpm range... Torque tables and all that "seem fine", by which I mean there does not appear to be any cases where spark or throttle is being affected by torque calculations. Driver seems to be in control for the most part for Predicted Axle Torque source too, which I think is what matters? Very interested in seeing some "good" tunes so I know what kind of ball park values I'm looking for. There were lots of tweaks in timing between Procharger and stock. Still deciphering what's good and what's not. Not just the base tables, but modifiers for humidity and other such things. Still working through learning all of that. Procharger also modified the SOI and CAM timing too. It looks like the PC tune altered cam timing in the low and mid range to remove cam retard. This is mostly at the part throttle and low rpm, probably for gas milage. So I dont think that's the cause of the part throttle slushiness now, but could be. Last, my boost gauge is telling me I'm seeing slightly less boost than I think I should be seeing. On one pull I was only seeing 4.4 PSI, and on another I was seeing 6.6. I was thinking it should be much higher than that, over 7 PSI... It was high 80's today, with moderate humidity... Could be that the boost gauge just doesn't read quickly enough to catch "peak"... Prob know more once I get my 3 bar MAP delivered and installed. Hope someone finds this useful. I'll keep posting as I make more changes this week Last edited by cjperformance; 09-20-2021 at 09:10 PM.