AutoVE tuning newly boosted car

[Jim_PA]

I'm into my 18th logging session now. My VE table just doesn't want to settle down. There are some pretty wild swings in it... Does anyone have some pointers?

The log I am posting was taken after flashing the tune file that is attached.

Besides the unruly VE table, it seems to be running very good. Much smoother than it ever has prior to adding the E-force SC, new injectors, etc, as shown by how nice the ve looks in those lower throttle cruising and idle areas... I am getting some occasional lean tip-in which is noticeable by a slight stumble or hesitation. Is the lean tip-in what I am seeing in the VE logs?

Do I need to decrease the PE TP% lower than 25%?

Over 4000 RPM or so it starts going rich, pulling timing, and it literally falls flat on it's face, but that's mainly because I haven't spent much time working on those areas yet.

I'd really like to get the VE more stable, as I've just been bouncing back and forth in a lot of the wild cells and not really seeing a change in the logs.

TUNE: 20075 RESULT LOG: 20077

Data filter used:
20076

Crappy VE table. I haven't spent much time in the higher RPM range yet:
20078

[joecar]

Smooth out your VE tables, and start again (flatten out the spikes and holes).

Are you getting an immediate MAF DTC...?

[Jim_PA]

Smooth out your VE tables, and start again (flatten out the spikes and holes).

Are you getting an immediate MAF DTC...?

Yeah, the MAF is failing immediately. I think I've tried some manual manipulation in one of the previous 17 runs, but will certainly try again! - Thanks

[statesman]

Set {C2908} to 0.1

Generally, the only time I see people having problems dialing in the VE table is when they fit the crappy 60lb deka/mototron injectors that come with some supercharger kits.

[Jim_PA]

Set {C2908} to 0.1

Generally, the only time I see people having problems dialing in the VE table is when they fit the crappy 60lb deka/mototron injectors that come with some supercharger kits.

Will do! --

These are 60lb LS9 Bosch FIC injectors, I'm using the data that came with them.

[Jim_PA]

It's coming along, I still have a lean spike in the 100-105 MAP at 1600 and a few other areas but I'm ignoring it for now. I think I went way overboard when I beefed up the VE in preparation for tuning.

Seems like the bigger injectors are making the VE table more sensitive?

[joecar]

...

Seems like the bigger injectors are making the VE table more sensitive?Yes, because they spray a significant fuel mass during their on-ramp and off-ramp.

[Jim_PA]

Watching the scanner (and afterwards the BEN map), I'm getting lean tip-in surges anytime I just nudge the throttle any amount at just about any RPM. It recovers very quickly and most of the time I can't even feel it.

6th gear it's running very rich 1500-2000 when I get in the throttle a bit (high 9's, low 10's AFR) - I imagine if I lean it out, it's going to go lean if I'm in another gear at lower speeds.

These seem to be the only issues I'm having, everything else is working out very well. I've just been ignoring these lean spikes and 6th gear rich condition and the MAP is looking good.

[joecar]

Post latest tune and log files.

[Jim_PA]

Most recent tune and log attached.

When does PE "turn off" Or is it always on once the PE enable conditions are met?


20145

20146

[Jim_PA]

Would I be better off with an e38 PCM? It seems like they have several problems of their own. Maybe a GMPP PCM?

It would be nice to get rid of the TAC module and my stand-alone reverse lockout controller.

[joecar]

Most recent tune and log attached.

When does PE "turn off" Or is it always on once the PE enable conditions are met?


20145

20146PE is active until any one of it's enabling conditions go away.

[joecar]

Are you getting a MAF DTC...?

[Jim_PA]

Are you getting a MAF DTC...?

P0102 and P1637 are currently read from the scanner

[joecar]

Try the attached tune file.

also log KR.

[Jim_PA]

Try the attached tune file.

also log KR.

Seems to run pretty well, seeing some KR in the higher maps where I think timing seems somewhat conservative?

Here's a really short log, I will have a much better one tomorrow.

Appreciate the help!!

20168

[joecar]

I did pull spark timing down a little... with boost you have to run less timing.

What fuel are you running (octane rating)...?

[Jim_PA]

I did pull spark timing down a little... with boost you have to run less timing.

What fuel are you running (octane rating)...?

93 Octane -- It's running pretty good!

Attached is a much better log...20173

I did alter the boost timing table to this:
0.507813
6.738281
7.773438
8.808594
9.296875
9.785156
10.292969
10.781250
11.269531
11.757813
12.265625
12.753906
13.242188
13.730469
14.238281
14.726563
15.214844
15.703125
16.191406

[joecar]

Looks much better...

there are two places in the log at steady throttle (approximately) where wideband indicates lean... post your new tune file.

also there are twp places on boost up where some small KR occurs, it doesn't look real, so I think it's ok.

[Jim_PA]

Looks much better...

there are two places in the log at steady throttle (approximately) where wideband indicates lean... post your new tune file.

also there are twp places on boost up where some small KR occurs, it doesn't look real, so I think it's ok.

Oddly, the car suddenly doesn't want to idle before it's warmed up with the AC is on. Hit key, fires up, and just falls down and dies. Have to either keep it running with the pedal or turn the AC off. Hasn't done that before, but nothing should have changed that.

I added some extra idle airflow and selectively multiplied 50% error correction -- It was still stumbling 1500-2000 in most gears when you get into the throttle.

Will flash this file tonight and see how it goes tomorrow.

20184

[joecar]

Did you try adding 100-150 rpm to the AC On columns in B4603...?

[Jim_PA]

It's still stumbling rich under a load in higher gears at 1500-2000, but then I'm basically leaning it out for it to be lean at those MAPs in other gears or different driving situations.

Just going in circles, it seems.

What is causing it, and how do I fix it?

[joecar]

It's still stumbling rich under a load in higher gears at 1500-2000, but then I'm basically leaning it out for it to be lean at those MAPs in other gears or different driving situations.

Just going in circles, it seems.

What is causing it, and how do I fix it?Do you have a log of this...?

[Jim_PA]

Attached tune was altered based on attached log file.


I filtered the log for > 30% TP, > 65 MPH, RPM < 2500 (Shows BEN's .85-.93 in many cells)

Then filtered for:

MPH < 50, RPM < 2500 (Shows BEN's > 1 in a lot of the same cells)


20203

20204

[Jim_PA]

I haven't switched out my 02 sensor in a while, maybe I'm due for a fresh one?

[joecar]

How many miles on your O2S...?

[joecar]

I'm still looking thru your files, I've been slowed up, sorry.

[Jim_PA]

I'm still looking thru your files, I've been slowed up, sorry.

40,000 miles or so. I'm in no hurry!

[Jim_PA]

I have the car running really well. It's been great all fall and winter. Now that temps are creeping up, I started getting P2101 codes again when I'm heavy on the throttle in the upper RPM range. This happens when the car has sat for a little bit and heat soaked.

Something is going awry ONLY when the air is hot. I haven't had this happen since September and I drive it every day of the week. :bash:

[joecar]

40,000 miles or so. I'm in no hurry!I do apologize, I had some family hospital stuff going on. When I last looked at your log/tune files you seemed to be on the right track (and you will know this when engine response/driveability is good).

[joecar]

I have the car running really well. It's been great all fall and winter. Now that temps are creeping up, I started getting P2101 codes again when I'm heavy on the throttle in the upper RPM range. This happens when the car has sat for a little bit and heat soaked.

Something is going awry ONLY when the air is hot. I haven't had this happen since September and I drive it every day of the week. :bash:Post your current tune/log files.

[joecar]

Remind me which wideband you're using...

[joecar]

Log GM.ETCTP instead of GM.TP.

[Jim_PA]

I do apologize, I had some family hospital stuff going on. When I last looked at your log/tune files you seemed to be on the right track (and you will know this when engine response/driveability is good).

Just throwing out my issues for anyone that might be listening, but I hope everything is going OK for you now!

It is definitely IAT related, and I'm not sure what happens first... either the car falls flat, then the code hits, or the car falls flat because of the code. It's too hard to tell. But it's definitely high IAT's, 4000+ RPM for like 2 seconds and poof.... code is thrown. Even in the winter I've parked it long enough to get some heat soak and went out and floored it and haven't had an issue. All I can think is that the IAT factors are pulling too much timing.

[Jim_PA]

Remind me which wideband you're using...

Innovate LC1, using the digital interface.

[joecar]

Post your current tune file.

so this happens when IAT is high, this is causing cylair calculation to be low, this may be tripping one of the sanity tables, now if we can figure out exactly what.

[Jim_PA]

I did add a new cam back in October http://www.tickperformance.com/tick-performance-blower-stage-1-v2-camshaft-for-ls2-engines/

The "heartbeat" Eaton blower has the IAT/MAP all in one unit that is mounted in the back of the blower. I'm not sure that heat soak is all the problem, maybe it's just the hot air.


21026

[joecar]

I did add a new cam back in October tick-performance-blower-stage-1-v2-camshaft-for-ls2-engines/ (http://www.tickperformance.com/tick-performance-blower-stage-1-v2-camshaft-for-ls2-engines/)

The "heartbeat" Eaton blower has the IAT/MAP all in one unit that is mounted in the back of the blower. I'm not sure that heat soak is all the problem, maybe it's just the hot air.


21026225/237 116 +5 blower cam... I'll look at your tune file today; do you have any logs from it...?

[Jim_PA]

I added some timing and then made a log.

2103121032

[Jim_PA]

Here is my log of getting P2101 and my tune. help! :D


21178

21179