This tool doesnt work in open loop or I dont know how to use it. I use MS Excel.

 

Thanks for the response.

One more quick question. What should I do with the Y axis base fuel schedule parameter? What happens if your last column is 17.01 BFS, and above 65-70% throttle, you have already entered the last column? Does it just use the AFR targets from the last known value? So if the last column it went to before moving "off" the map was say AFR Target of 11.79, would that stay the target at any BFS above 17.01?

Thanks,

 

Yes, when you move outside of max BFS value ECU interpolate from last known values...
Set last BFS cell to be little bit more than your maximum logged BFS...for exmple if 19,5 then set it to 20/21 . Afterwards use interpolation from first to last BFS value.
Do the same with timing map if necessary.

 

So what happens with the car when you peg the MAF? Does it just adjust the BFS from the last value in the table also?

 

Hey. I am not getting accurate results using djamps MAF tool. I know it must be user error. Can someone help me with how I can filter out decel, idle, and other data that may be distorting the calculations?

Thanks,

 

import CSV file to excel using data import option. Then you can use Excel features to filter data...



And tell something about your setup...cuz your logs look very interesting
Are you doing pulls on 1st or 2nd gear?
What did you do with your MAF?
Are you N/A or FI?

 

Sorry, sure.
I have a Rev Up engine with 2.87 34/28 pulley, upgraded intercooler.
I have 630cc Bosch injectors, with a custom return fuel system (modified OEM fuel rails) and an Aeromotive 340lph fuel pump
Cats have been completely hollowed out, and a Magnaflow muffler has been custom installed replacing the stock muffler in the rear.

-What gear should I be doing pulls? I just turned the logger on in ROMeditor, and drove around. Several gears were included.
-MAF is stock (unfortunately), I know upgrading I'll have to rescale the MAF and start over, but this was just for practice and decent around town (not WOT/High RPM) running.

 

You have 6MT so do pulls on 4th or 5th gear to tune high loads area. This should allow you to slowly increase BFS and RPM and achieve steady state conditions to make good measurments. Remenber to fully depress acceleration pedal doing pulls.
Due to fuel return system and big injectors your BFS values are low (6 or 7??? as maximum). Adjust your BFS axis in fuel and timing map...
Use lower gears to tune low load and high RPM area.

And watch AFR and timing on high loads!! AFR 17 on high rpm and bfs are unacceptable!!

 

Noob made it to page 3 before my eyeballs cant take anymore on my cell phone. Helpful thread think the mail in flash would be for me though.

 

Looking at your logs, you have no AFR data, which makes the MAF tool pretty useless.

It's easy to exclude decel and idle stuff, just set the TPS minimum voltage to like 1.1v or so and it will exclude anything with throttle values below that.

 

On my 03 with Vortech I don't have the factory wideband. Now UpRev has target A/F table and my understanding is the ecu tries to target these values (within reason)...

In my Osiris Trends my O2 Sensors just show lean or rich, no numerical value. Is that Lean/Rich that is displayed in reference to the current target AFR? Ex, if my current AFT Target from the table is 14.7 but I'm at 13.0 Rich would be displayed?

How does the ECU target AFR without the oem wideband and without being able to display an AFR value using UpRev?

 

Old question, but a short answer anyway.

Ecu targets the set values only in closed loop. And when AFR is 14.7. A narrowband can't measure accurately anything else than close to stoichiometric 14.7. When in open loop there will be no corrections.

When you have tuned the fueling so that it will hit the set targets you can just change the targets if you wan't the car to run leaner or richer. Easy way to tune is to just set the whole map to 12 AFR (rich). After you are on target you can make it go leaner if you like.

 

I'm just working on tuning my MAF table since I've added resistors to rescale the MAF.

I've got the closed loop portion dialed in pretty good, typically 2% or less corrections.

In the open loop portion I'm noticing something odd on my MAF table. Using the adjustment method of comparing target AFR to logged LC-1 AFR and adjusting for .1 AFR ~ 1% adjustment I have a strange bump in my MAF table.

Should the MAF table typically increase from top to bottom? Because using the method above to get my AFRs where they should be I have a big jump in MAF value from 3.05V to 3.13V, then from 3.20V to 3.28V the MAF value actually goes DOWN... Is that normal?.. Seems odd to me.

 

So, after finishing updating the MAF table off my last log, it actually goes down in a couple places... Is this normal?

 

Thats not normal. It should be pretty linear. Why did you add a resistor instead of just rescaling it in uprev?

 

It shouldn't be linear, it should be a curve. As far as I know it should always be increasing, that's why the drop seems abnormal to me.

As for the resistor, I was maxing the MAF voltage at only 5500 rpm. There is no way to solve that in UpRev without changing/modifying the MAF. Adding a resistor rescales the output from the MAF to ECU allowing me to use more of the MAF's usable range that is otherwise unreadable by the ECU.

 

I've been doing the pulls for open loop in 2nd gear, I think I'm going to do a couple in third today. I'm thinking the longer pull will give the datalog more usable data in that range. Then I'll see if that weird blip goes away.

 

I figured out my issue I think. I didn't have the AFR table set to a flat value while tuning the maf table, as well as 2nd gear pulls.


I flattened the AFR target table and did a couple 3/4 pulls last night and got much more usable data that once I adjusted the MAF table that weird bump went away.

 

Running lean
Has anyone had the opposite happen? I need to do more research on my old logs after my Dyno tune to check afr from last year(i checked and they were good running 12.5 or so). I have tried changing my ignition timing, fuel compensation and target table to try and get my car to run more rich all season. I cleared learned fueling. It would hit proper afr on idle but during wot it would run mid to high 13's and the lowest I got to was 13.2-5 until a couple nights ago. I noticed my fuel correction was at 105-7% to hold idle afr. I raised my k value to 29100 until my idle correction was around 100. I re logged and everything ran great and I hit the target afr! but then I looked at the log tonight and the fuel correction and afr was all over during medium load acceleration. Has anyone had to readjust there k value once set on a stock setup. My car is stock with intake, arts, and tdx2. Also, since I updated and reflashed my ecu, map switching is not working??? Anyone having this issue recently. I just updated a couple days ago and reflashed. Could the lean issue be cause by an exhaust leak? My car is also due for plugs, would better spark change this. I would think poor spark would end up rich not lean?

 

Sounds like your MAF table and fuel comp tables need to be tuned. Did you just install uprev with their base map, or did you get a professional tune at some point in time and things have since gone awry?