[cjperformance]

Ok! So I got the TQ mgmt issue solved. At least I think I do. I assume it's what I changed, and not just some weird temperature and moon phase imbalance making it go away now.

The first bump, where the vertical line is in my last image occurs only when I artificially hold it in 3rd at low rpm and WOT to get a full rpm range log. After some experimentation, it just doesn't occur if I am not manually holding it in that gear.

The second blip (the very next one after the line) at around 5K rpm took some experimentation, but I think I've got it nuked. The canned tune had adjusted the virtual torque tables from stock, but just not enough. So first run today... verified TQM was still there at 5K-ish... it was. Bumped the VTT per KingLT1's instructions he had previously provided in a PM. Didn't want to bump them until I had a reason to since canned tune already bumped from stock. Honestly, it was a shot in the dark, didn't know if this was going to fix it, and it was something I hadn't tried yet. So for second pass, I bumped the final row in VTT up by 10% (multiply last row of each section by 1.1), then select whole range of cells (all of them from first row to last row, with cell linking turned on) and interpolate the middle rows.

Made another pass, still there, but it was a little better. Decided to go an additional 15% by the same method. The low 3rd gear thing is still there, but honestly dont care. I am chalking it up to something with unlocking the TC, or a downshift or something... again, doesn't occur unless holding that gear manully. The TQM at the higher rpm was gone, and it runs great! I may have overdone it a bit by going addl 15% on that second update to VTT. I may back that down a bit. But.... then again... it really runs like I want it to now. It holds gears quite a bit longer at part throttle, which not good for fuel economy, but I have always thought the "track mode" was too tame to be a track mode. So now it's using CJPerformance track mode . So, now if i'm applying steady or increasing throttle, it holds lower gears for longer, just what I want if I'm going to roll out through an intersection and punch it after I'm clear.

At this point, I feel like I've got the tune pretty much nailed down from what I can tell. Runs incredibly strong now. I've done so much incremental tuning, I had thought about going back and applying the original canned tune to compare by seat of pants... but honestly, that tune scares the **** out of me now. Would never run that tune again.

Going to put together a summary of all the changes between the canned tune and current and post it later. Cant wait to get this to a track and see if my perceptions match reality.

[cjperformance]

Originally Posted by Evansa22

When estimating horsepower, were you talking about maf flow also? Or just using rpm and engine torque? Rough estimate is taking your maf in lbs/min and move the decimal over one or multiple by 10, same thing. So it was showing 724 on last log you posted. Right at the 725 you stated if everything is reading correct.

Nice. So here's a snip from my last log. MAF in lbs/min was 69.73 or estimated 697 hp. The estimate from the Engine Torque pid and RPM for that same point is 649.4 hp.

The graph in the upper right is max values per rpm of the Engine Torque/RPM calculated hp.

Again, I dont want to assume anything based on these numbers. I'll have to correlate that with a 1/4 mi run in the near future. Hoping Oct 8th.

[cjperformance]

Again assuming nothing in the tune I changed (like VTT) altered how the base calculation works... Here's a before and after of canned tune, versus where its at now.

A gain of 100 hp in the mid rpm ranges.

At the top end, gains vary from around 35-50 if you throw out some of the outliers.

That midrange improvement will hopefully help with the 60 ft times.

[cjperformance]

Even used excel to generate a graph of canned vs now.

I'm having too much fun with this. lol...

It official if it looks like dyno sheet right?

[cjperformance]

That flat spot between around 4800 RPM and 6200 RPM is bugging me in the "now" graph. I feel like that should be more of an arc. Maybe I'll play around some more with timing in that area. It's in the region where I start backing off the timing due to boost. I bet it'll take a bit more timing there.... maybe a different timing falloff curve?

[wnta1ss]

Originally Posted by cjperformance

Even used excel to generate a graph of canned vs now.

I'm having too much fun with this. lol...

It official if it looks like dyno sheet right?

While it may resemble a dyno sheet to some extent, it isn't really one. I enabled this horsepower function and checked 3 configurations in VCM, and all 3 of them exhibited this bump in the upper end just like yours is showing.

Obviously the basic formula for hp is correct, and the reason that this is happening is because the Engine Torque and Delivered Engine Torque channels are reporting higher values at higher rpm than reality IMO.

[Kerry]

Its heavily based on the maf curve. That will change the hp reading dramatically

[cjperformance]

Originally Posted by wnta1ss

While it may resemble a dyno sheet to some extent, it isn't really one. I enabled this horsepower function and checked 3 configurations in VCM, and all 3 of them exhibited this bump in the upper end just like yours is showing.

Obviously the basic formula for hp is correct, and the reason that this is happening is because the Engine Torque and Delivered Engine Torque channels are reporting higher values at higher rpm than reality IMO.

I'm actually glad to hear it's doing that on yours as well, and not just some weird hp/torque curve.

Latest update. I squeezed a bit more timing into that flat spot. Feels stronger, no knock in that area. HPTuners is showing slightly over 600 hp from 5400 RPM and up.

I'm feeling really good about the tune now. Cant wait to get it to the track.

An interesting note... I was having the A8 shudder with the canned tune... once I bumped up the VTT values... I no longer have torque shudder. There's still a constant 200-300 rpm up-down every few seconds, which I think is the lockup clutch slipping? But the rumble-strip vibration is gone. I think what's happened is that now it unlocks the converter at lower pedal input before the shudder happens. Going to look at doing fueling and torque conv over the winter when I wont be driving it much anyway.

[cjperformance]

Originally Posted by Kerry

Its heavily based on the maf curve. That will change the hp reading dramatically

Good info. Makes sense. After I get it to the track, I'll see about getting it on a dyno. I'm determined to do the tuning myself, but I'd like some "numbers" to give me a warm fuzzy... or to tell me I'm off.

[laynlo15]

Originally Posted by cjperformance

I'm actually glad to hear it's doing that on yours as well, and not just some weird hp/torque curve.

Latest update. I squeezed a bit more timing into that flat spot. Feels stronger, no knock in that area. HPTuners is showing slightly over 600 hp from 5400 RPM and up.

I'm feeling really good about the tune now. Cant wait to get it to the track.

An interesting note... I was having the A8 shudder with the canned tune... once I bumped up the VTT values... I no longer have torque shudder. There's still a constant 200-300 rpm up-down every few seconds, which I think is the lockup clutch slipping? But the rumble-strip vibration is gone. I think what's happened is that now it unlocks the converter at lower pedal input before the shudder happens. Going to look at doing fueling and torque conv over the winter when I wont be driving it much anyway.

Track times are getting short at Gateway since every weekend has an event. I'm going on the 6th for WOW to get some runs in and see if I can run 10.70s with my bolt on C7, should be good DA and lower temps.

[cjperformance]

When i go, i usually get there early, do about 3 runs and leave before it gets too crowded.

[KingLT1]

Originally Posted by cjperformance

I'm actually glad to hear it's doing that on yours as well, and not just some weird hp/torque curve.

Latest update. I squeezed a bit more timing into that flat spot. Feels stronger, no knock in that area. HPTuners is showing slightly over 600 hp from 5400 RPM and up.

I'm feeling really good about the tune now. Cant wait to get it to the track.

An interesting note... I was having the A8 shudder with the canned tune... once I bumped up the VTT values... I no longer have torque shudder. There's still a constant 200-300 rpm up-down every few seconds, which I think is the lockup clutch slipping? But the rumble-strip vibration is gone. I think what's happened is that now it unlocks the converter at lower pedal input before the shudder happens. Going to look at doing fueling and torque conv over the winter when I wont be driving it much anyway.

Try setting the converter up so it doesn't lock until 8th gear part throttle around 60mph. That should fix your issue. It will drive nicer that way as well.

[cjperformance]

Originally Posted by KingLT1

Try setting the converter up so it doesn't lock until 8th gear part throttle around 60mph. That should fix your issue. It will drive nicer that way as well.

Cool. I will try that as soon as i get tcm unlocked. I dont have tcm unlocked yet, but plan to get than done one winter sets in and im not driving as much.

[KingLT1]

Originally Posted by cjperformance

Cool. I will try that as soon as i get tcm unlocked. I dont have tcm unlocked yet, but plan to get than done one winter sets in and im not driving as much.

Oh well shit yea you need to do that asap. Turn off AFM, Zero out the TCC slip tables and disable part throttle Converter lockup until 8th gear and she will drive sweet.