Logging Airflow 2bar custom OS

[zl1killer]

So I have a bar custom OS installed and I want to be able to record total airflow in LB/min. MAF is completely gone.

do I change the high RPM disable on Dynamic Airflow to be able to read values above 4k RPM?


Oh and just so everyone can see:
3 runs recorded on the cam put together.
http://www.youtube.com/watch?v=yVuEMXPCpuI

[LSxpwrdZ]

Yep for pure SD set the dynamic airflow disable rpm above your rev limit. To get total airflow log dynamic airflow.

[zl1killer]

OK, sweet. Thats what I had thought.

2nd question. With this Custom OS 2 Bar, for fueling it is:
PE enablers & etc with Power Enrichment - EQ Ratio vs. RPM
and Boost Enrichment vs MAP

Both the mentioned above tables are set to 1.31 Lambda (11.15 AFR)
As this is a 2 bar Custom OS, fueling is directly controlled via the VE table correct?

so to get my fueling down to the 1.31 lambda, I would log PRimary VE vs RPM vs MAP with a wideband as a comparator (input)

Raise VE values for fuel, lower to subtract. I know this is a rather basic question, just want to make sure I have my bearings straight before I fall head first.

[LSxpwrdZ]

Yep got it right! Log commanded AFR as well as your wideband that way you can use the AFR Error PID. Log the AFR Error into your 2bar SD table histogram and it tells you the percentage off the VE table is. Your basically targeting what you input in the PE/BE tables when those are enabled and when you are not in PE/BE it will use the commanded EQ from the OLFA (open loop fuel/air) table located in the open loop/closed loop tab.

[zl1killer]

ok now what about Fuel trims. Right now WOT from my dyno pulls my LTFTs are +8 in my 7psi VE range and at 13psi they are at +6 in the VE range.

so the fuel trims are adding 8 and 6% fuel at that point...how do I get that to zero (or near zero)?
I can post the dyno graph and the log from the dyno pull.

[zl1killer]

Yep for pure SD set the dynamic airflow disable rpm above your rev limit. To get total airflow log dynamic airflow.

and the maximum the MAF could have read was 67.7LB/min = 512g/s

Well, even with the 4k rpm dynamic airflow limit, it still was changing above 4k rpm... but railed at 67.7 lb/min. If I remember right, this is the maximum. So how do I actually see (calculated) or actual airflow that my engine is consuming?

[robbyredneck]

ok now what about Fuel trims. Right now WOT from my dyno pulls my LTFTs are +8 in my 7psi VE range and at 13psi they are at +6 in the VE range.

so the fuel trims are adding 8 and 6% fuel at that point...how do I get that to zero (or near zero)?
I can post the dyno graph and the log from the dyno pull.

run open loop for 0 or tune the livin' fudge out of it for near 0. thats the crappy thing about ltft's is that they are on for be, at least they are rich when they are on.

[zl1killer]

I'm also unsure of this Dynamic Airflow that I originally asked about... I don't think it is going to display more than 67LB/Min no matter what I change.

[zl1killer]

any input from logging airflow with a 2 bar custom OS??

I do not believe I will be able to log above 67.7 lb/min. I raised my rpm disable limit on the dynamic airflow and it still maxed at 67.7 and I know 100% that I'm around 75 lb/min of air MAX.

[robbyredneck]

if you don't mind me asking. ............. why do you want to log dynamic airflow?

[zl1killer]

honestly, I don't know what else to log to see what airflow in LB/min (or whatever units, I can convert) that I'm flowing. I would like to know where I am with regards to airflow and my setup (turbo).

[robbyredneck]

is your map reading not enough info? i tried logging airflow in 2bar and did'nt get any real data. i think because there is no real meter, there is no real data and any data that you do get is "calculated". try searching mnr i think he kinda goes over this

[zl1killer]

map reading is simply pressure. manifold absolute pressure. that is what I was thinking about regards to a sensor reading airflow. Remove the MAF... and no sensor reading airflow.

[blownbluez06]

ok now what about Fuel trims. Right now WOT from my dyno pulls my LTFTs are +8 in my 7psi VE range and at 13psi they are at +6 in the VE range.

so the fuel trims are adding 8 and 6% fuel at that point...how do I get that to zero (or near zero)?
I can post the dyno graph and the log from the dyno pull.

I hope you're not misunderstanding the LTFT's. Turn your LTFT's off and keep them off. They are no indication of your WOT fueling being proper or improper.

[smithers]

OK, sweet. Thats what I had thought.

2nd question. With this Custom OS 2 Bar, for fueling it is:
PE enablers & etc with Power Enrichment - EQ Ratio vs. RPM
and Boost Enrichment vs MAP

Both the mentioned above tables are set to 1.31 Lambda (11.15 AFR)
As this is a 2 bar Custom OS, fueling is directly controlled via the VE table correct?

so to get my fueling down to the 1.31 lambda, I would log PRimary VE vs RPM vs MAP with a wideband as a comparator (input)

Raise VE values for fuel, lower to subtract. I know this is a rather basic question, just want to make sure I have my bearings straight before I fall head first.

WHOOWW whoow whoow... LAMBDA 1.31 is NOT 11.15AFR.
1.31 = 19.2322 AFR
0.759 Lambda is 11.15 AFR

[smithers]

I hope you're not misunderstanding the LTFT's. Turn your LTFT's off and keep them off. They are no indication of your WOT fueling being proper or improper.

That is what I was thinking...
he is not tuning with LTFTs on WOTs and targeting 1.31 Lambda...

[LSxpwrdZ]

Def turn off the LTFT! They are no good at all! They are only used on factory GM vehicles to keep the tune true from vehicle to vehicle with the same tune... So since your tuning to your setup there is no need for it's stored correction. If you use CL only use STFT!

As for the Dynamic Airflow deal the maximum the PCM will read is 512g/sec on the datalogging however that is why going SD on a boost setup is nearly a must because it will physically fuel more than 512g/sec it just wont log it.

[zl1killer]

wait a minute... ok I must have confused the two.
EQ Ratio in HPTuners in my tune is 1.31 ( 14.7 / 1.31 = 11.22 )
I'm using the STFTs and LTFTs to get my VE in line at part throttle condition.

So on a factory car off the show room floor, at WOT, if the LTFTs are +8 they are doing nothing with physically adding fuel? It is just an indicator as the VE table is off?

I have read the FAQ with STFTs and LTFTs and I know I need to watch the STFTs as they are the instant values.

[smithers]

As mentioned several times in other threads,
if LTFT are Positive (add fuel) this carries to PE, so ECM adding more fuel. meaning, if you had a perfect VE in PE/wot, its now rich, hence why many also state to tune the car and only re-enable STFT and keep the LTFT disabled.
- this prevents over time skewing of your GOOD tuned VE table during WOT.

Also remember its important to tune the VE with LTFT Reset otherwise will be tuning with whatever trim values are stored at that time.

here are just a couple:
http://www.hptuners.com/forum/showth...ght=stft+reset
http://www.hptuners.com/forum/showth...ght=stft+reset

[zl1killer]

Out of curiosity if I wanted to prove this theory of the LTFTs adding fuel, could I simply disable closed loop fueling in bi-directional controls, and go WOT(make a pull), and then re-enable and go WOT and if they are different (LTFTs +) it should be richer.