Official OpenFlash Tablet FA20 Tuning Tech Discussion Thread

[bakerr6]

yea I'm having some issues too, but I think I've ironed mine out. If not, I'll be reaching out to you for a few other ideas

[horrorbiz]

Originally Posted by shiv@vishnu

Are you running the last version of OpenFlash Manager 1.04? It's be available for download for approx 2 weeks. If you are running an older version, just remove the version you have and reinstall the new version that can be downloaded from HERE.

That worked. I flashed my car—it feels great!

[Apoc]

Here are my logs for the revised OTS Stage 1. Looks good I think but all I see is wavy lines.

http://datazap.me/u/dmmccrea/dec-31?1-2-7-9-11

[Shiv@Openflash]

Originally Posted by Apoc

Here are my logs for the revised OTS Stage 1. Looks good I think but all I see is wavy lines.

http://datazap.me/u/dmmccrea/dec-31?1-2-7-9-11

That log looks perfect. Which map version are you running? How many miles since you updated the flash?

[FrsDuke]

Wish my logs looked like that haha

[Apoc]

Originally Posted by shiv@vishnu

That log looks perfect. Which map version are you running? How many miles since you updated the flash?

It was the stage 1 map you sent me Sunday afternoon. I've put about 100 miles on since I flashed.

[solidONE]

http://www.datazap.me/u/solidone/ltft-fix-test-3-1-1-14

Mine does not look nearly as good as Apoc's, but it's a definite improvement. I noticed the fuel trim will increase from about 5k to 5.5K to about 10% from 5% under WOT. It's also inconsistent for me. One cycle it will run great with IAM pinned at 1 and low positive fuel trims. The next cycle the fuel trim will increase with low load and RPMs and IAM drops.

I also noticed that my AFR's at the top end is around 11.25, a little ridcher than the target AFR. Apoc's log that he posted was at about 12.0 AFR. Is he not running leaner than the target AFR up top?

[solidONE]

So I went ahead and re-scaled the MAF input + 5% across the board, and the results are pretty good. The LTFT will go up from 0% to 5% at about 3.5v from the MAF sensor. I have increased the numbers past 3.5v anothre 5% and I expect the LTFT to be even better. Will take logs later today.
http://www.datazap.me/u/solidone/5-m...?1-2-3-9-10-11



Quick question @shiv@vishnu. Is there a good reason why the target AFR are so rich @11.25 AFR? What would happen if I enlean the target AFR's closer to 12.0 afr?

[solidONE]

Here's my latest log:

http://www.datazap.me/u/solidone/maf...2-3-9-10-11-12

Look, ma! I'm tuning! lmao
LTFT stays pretty close to 0% save for the 2.5v~3.5v MAF range. Will increase it another 2%. IAM has not gone any lower than .99 since I first changed the MAF scaling.

Since I had to adjust the MAF scale by 5%~10%, does this mean my intake and the way I trimmed the snorkel is 5%~10% more awesome than Shiv's test car?

[s2d4]

Originally Posted by solidONE

So I went ahead and re-scaled the MAF input + 5% across the board

This doesn't sound like scaling but more like a multiplier/gain?

Originally Posted by solidONE

more awesome than Shiv's test car?

perhaps due to the catless FP?

[solidONE]

Originally Posted by s2d4

This doesn't sound like scaling but more like a multiplier/gain?


perhaps due to the catless FP?

Hmmm... I think your right about the front pipe, but let's just say my intake is 5% more awesome. lol

I don't know the terms but the designated value that indicates air flow per voltage was increased across the board. 5% at the low end (idling and granny throttling range), now 7% at the lower middle range, and 10% increase at the top end of the scale.

[jamesm]

i'm not sure what your mechanical setup is, so i can't really say for sure why your MAF required adjustment, but i know that even on stock cars some have found it to be necessary.

there are a few major components to fueling calculations that effect what you see in fuel trims or fueling error charts if you use them. MAF scaling, port injector scaling, injector battery offset (or dead time, or latency, whatever), and also direct injector flow rate. generally speaking you adjust what you change, so if you install an intake, you look to make maf corrections. if you install larger injectors, you're adjustments should be to the scaler and latency, not touching the other areas. the only time in which you'd have to mess with direct injector flow rate is when you change fuel density (use e85).

when you find yourself applying a flat correction to the whole maf scale, that is a smell. it tells you there is something else wrong, unless of course you've just changed the diameter of your maf tube.

it's very important when trying to calculate or correct fueling error that you maintain process separation between the involved components. i've found logging port and direct injection independently (through port/di ratio adjustments and logging injection mode) to be absolutely crucial in getting everything correct once e85 was introduced. if aftermarket port injectors are involved, you'll want to isolate them as well and eliminate noise introduced by the direct injection system when tuning them.

[solidONE]

Originally Posted by jamesm

i'm not sure what your mechanical setup is, so i can't really say for sure why your MAF required adjustment, but i know that even on stock cars some have found it to be necessary.

there are a few major components to fueling calculations that effect what you see in fuel trims or fueling error charts if you use them. MAF scaling, port injector scaling, injector battery offset (or dead time, or latency, whatever), and also direct injector flow rate. generally speaking you adjust what you change, so if you install an intake, you look to make maf corrections. if you install larger injectors, you're adjustments should be to the scaler and latency, not touching the other areas. the only time in which you'd have to mess with direct injector flow rate is when you change fuel density (use e85).

when you find yourself applying a flat correction to the whole maf scale, that is a smell. it tells you there is something else wrong, unless of course you've just changed the diameter of your maf tube.

it's very important when trying to calculate or correct fueling error that you maintain process separation between the involved components. i've found logging port and direct injection independently (through port/di ratio adjustments and logging injection mode) to be absolutely crucial in getting everything correct once e85 was introduced. if aftermarket port injectors are involved, you'll want to isolate them as well and eliminate noise introduced by the direct injection system when tuning them.

Only modification that would require adjustment in the fueling I have is a cat delete on the front pipe and a drop in filter with trimmed intake snorkel. I switched back to the factory air filter and the high LTFT remained the same as with the aFe panel filter. The snorkel and drop in filter were accounted for in the tune, according to Shiv's posts. The rest of the intake is completely stock, including the sound tube. Not sure how the exhaust mod can change the MAF sensor readings.

With no vacuum or exhaust leaks to skew the O2 readings. The fuel trims were running pretty high but not high enough to trigger CEL with Vishnu's STG 1 tune. Was the same when I replace the air filter with the factory unit. How would you adjust for more fuel enrichment in this instance. Unfortunately, I do not have any way to log port to DI ratios effect on AFR. Also, what do you think about the 11.25 AFR at high load. I understand that O2 sensors are not 100% accurate, but does it read so rich that we have to run the AFRs that low?

After the adjustment I made and the LTFT at 0%, car runs smoother and IAM is pinned at 1.0 and not budging at all. Although, it is running a tad rich according to the STFT at low load, part throttle conditions.

[jamesm]

Originally Posted by solidONE

Only modification that would require adjustment in the fueling I have is a cat delete on the front pipe and a drop in filter with trimmed intake snorkel. I switched back to the factory air filter and the high LTFT remained the same as with the aFe panel filter. The snorkel and drop in filter were accounted for in the tune, according to Shiv's posts. The rest of the intake is completely stock, including the sound tube. Not sure how the exhaust mod can change the MAF sensor readings.

With no vacuum or exhaust leaks to skew the O2 readings. The fuel trims were running pretty high but not high enough to trigger CEL with Vishnu's STG 1 tune. Was the same when I replace the air filter with the factory unit. How would you adjust for more fuel enrichment in this instance. Unfortunately, I do not have any way to log port to DI ratios effect on AFR. Also, what do you think about the 11.25 AFR at high load. I understand that O2 sensors are not 100% accurate, but does it read so rich that we have to run the AFRs that low?

After the adjustment I made and the LTFT at 0%, car runs smoother and IAM is pinned at 1.0 and not budging at all. Although, it is running a tad rich according to the STFT at low load, part throttle conditions.

if you're on pump gas and the only thing you've changed is related to the intake (the filter and trimmed snorkel) then it would be reasonable to adjust the maf, it just doesn't make sense that it would require an across-the-board correction like that unless the diameter changed, which i don't believe it has given your description. typically any changes introduced by something like a filter or altering the airbox would look more like turbulence, less like global correction.

you are on pump gas, correct? i'd recommend going back to stock maf scaling and creating a proper fueling error chart from at least 30k rows of data, just to see where you really are now. there is very little to learn from looking at trims in the log without applying some math and making the data more reasonable to interpret. in fact you can be led very far in the wrong direction by just looking at raw logs without filtering and processing.

once you have good reliable data to go on, you'll see if changes are necessary and know (pretty much) exactly what to do to fix it.