Calc.VET: correcting MAF and calculating VE (in single log)

[pinstripebob]

No worries! I've kind of gotten addicted to this whole tuning thing. I've attached my latest tune for reference, but now I'm going after knock retard. For some reason I'm getting a few degrees of knock retard kicking in around 2800-3600 and .40-.64 grams/cyl. I've gotten to the point that B5001 is just about 1.00 after some logs.

Garrett_GTO_tuned_20160821_1.ctz

[n8dogg]

hey guys, I've been MIA, but back into a C5 vette so back into the tuning world! 1 of my LC-1's crapped the bed last night, I'll have to get my 2nd one up and running. I shut the door on the cords and I think I pinched a wire that didn't want to be pinched, darn!

Anyhow, I question about the Calc Vet VE map. In the how-to it says to use "Calculated VE %, BEN corrected" for the map data. When I use this, I get decimals as data, lower regions are around .5, upper regions 1.0, 2.0, 3.0, 4.0, 5.0. Why? Why isn't it a percentage like the VE table? If I replace "Calculated VE, BEN corrected" with "Calculated VE %", the data shows as it should. But don't I want the BEN corrected VE %?

If needed, I'll post up my log and PID's when I get home from work.

Thanks!

[joecar]

Post screenshots so I can see what is going on.


Use VE [g*K/kPa] instead for VE (in tunetool go Edit->Properties and set VE units to g*K/kPa).

[n8dogg]

Post screenshots so I can see what is going on.


Use VE [g*K/kPa] instead for VE (in tunetool go Edit->Properties and set VE units to g*K/kPa).

Thanks Joe, I figured it out. My OS is not compatible with Dyn Air Temp in the standard Calc VET PIDs file. I had to use the alternative. I did switch the VE table over to g*K/kPa, made life a little easier!

Question in regards to Lambda/AFR. Stoich setting in the PCM is 14.68 assuming 100% gasoline. We have (up to) 10% ethanol in our gas here. While I'm performing Calc VET tuning do I need to make any adjustments to the stoich/target AFR in the PCM? Or is that irrelevant when we tune the VE/MAF tables for lambda 1.0? Thanks!

[joecar]

Yes, for E10, set B3601 to 14.2.

[n8dogg]

But in my log Lambda averaged at 1.002. Does this indicate that E10 isn't actually 10%?Nate 02Z Calc Vet 4 18 17.efi

[joecar]

Yes, correct.

I'm told that alcohol content in gasoline can be +/-8%... i.e. your E10 can be close to plain gasoline.

~ by phone ~

[n8dogg]

Yes, correct.

I'm told that alcohol content in gasoline can be +/-8%... i.e. your E10 can be close to plain gasoline.

~ by phone ~

Wow! No wonder why sometimes after getting gas it feels like I gained some hidden power! Guess I'll stick to the gas station that yields me the closest to Lambda @ 14.68 AFR.

[EspenT]

Hi

I have a 03 Silverado 5.3 Im in the process of supercharging. Ive installed headers and exhaust. Upgraded fuel system. As I struggle a bit learning EFI Live Ive not installed the supercharger itself, and are using stock injectors and fuel pressure.

As I have problems quoting text from the summary notes(norwegian character set seems to do strange things). I will just copy some of the text.

------
6. B3616: PE Enable: make sure PE enables as load becomes significant
(e.g. below 60% TP below 3200 rpm, 35% TP above 3200 rpm).
-------

After reading this, my understanding is that PE should be used for all significant loads.

-------
PE Mode/WOT:

PE Mode is best performed utilizing 100% TPS (WOT). This is because a number of Fuel Dynamic Parameters are kept steady and constant (evaporation, cylinder wall-wetting, etc). Also, a steady 100% TPS insures accurate computation of the MAF Airflow. Avoid part-throttle PE Mode Tuning.
-------

But after reading this later text, my understanding is that PE is only for WOT. Whats correct?


Then I somwhere read that high postetive fuel trims are no good. Since mine are pretty high, I do not know what to do. Please se attached screenshot .

[joecar]

Hi ET,

------
6. B3616: PE Enable: make sure PE enables as load becomes significant
(e.g. below 60% TP below 3200 rpm, 35% TP above 3200 rpm).
-------

After reading this, my understanding is that PE should be used for all significant loads.

-------
PE Mode/WOT:

PE Mode is best performed utilizing 100% TPS (WOT). This is because a number of Fuel Dynamic Parameters are kept steady and constant (evaporation, cylinder wall-wetting, etc). Also, a steady 100% TPS insures accurate computation of the MAF Airflow. Avoid part-throttle PE Mode Tuning.
-------

But after reading this later text, my understanding is that PE is only for WOT. Whats correct?

Yes, correct, WOT.

Then I somwhere read that high postetive fuel trims are no good. Since mine are pretty high, I do not know what to do. Please se attached screenshot .

Yes, correct, high positive trims indicates that the MAF and/or VE tables are under-calculating the cylinder airmass.

If you isolate the MAF (i.e. disable VE by setting B0120 to zero) you can use the trims to correct the MAF table.

If you isolate the VE (i.e. disable MAF by causing a MAF DTC) you can then use the trims to correct the VE table.