Official OpenFlash Tablet FA20 Tuning Tech Discussion Thread

[solidONE]

Originally Posted by jamesm

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.

You totally lost me at "30k rows." If you have a link or source on how to do this and what's required I would greatly appreciate it.

Here is an earlier log I took with the unmodified v1.42b tune:
http://www.datazap.me/u/solidone/91-...2-3-4-7-8-9-10

If you zoom in on the first spike in rpm to red line you will see the LTFT at +12.5%~17.19%

Here's after I modified the MAF scale:
http://www.datazap.me/u/solidone/maf...2-3-9-10-11-12

I understand that looking at fuel trims and adjusting one parameter is probably not the best way or the right way, but it produced good result. Stays on the target AFR's without much or any correction by the ECU. I've worked on cars for a while, but am an total noob when it comes to electronic engine management. Closest to "tuning" fuel and ignition I've done is rejetting carbs and installing woodruff key to advance timing or making a car pass CA smog test. I need to get schooled in this stuff. It's all mumbo jumbo to me right now.

[jamesm]

Originally Posted by solidONE

You totally lost me at "30k rows." If you have a link or source on how to do this and what's required I would greatly appreciate it.

Here is an earlier log I took with the unmodified v1.42b tune:
http://www.datazap.me/u/solidone/91-...2-3-4-7-8-9-10

If you zoom in on the first spike in rpm to red line you will see the LTFT at +12.5%~17.19%

Here's after I modified the MAF scale:
http://www.datazap.me/u/solidone/maf...2-3-9-10-11-12

I understand that looking at fuel trims and adjusting one parameter is probably not the best way or the right way, but it produced good result. Stays on the target AFR's without much or any correction by the ECU. I've worked on cars for a while, but am an total noob when it comes to electronic engine management. Closest to "tuning" fuel and ignition I've done is rejetting carbs and installing woodruff key to advance timing or making a car pass CA smog test. I need to get schooled in this stuff. It's all mumbo jumbo to me right now.

http://www.ft86club.com/forums/showthread.php?t=53773

just ignore all of the stuff about port/di ratios. looking at your log it looks to be much improved, but it'll be a lot easier to tell with the data formatted in a more friendly way.

[jeebus]

Originally Posted by s2d4

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


perhaps due to the catless FP?

I have a catless fp too and my logs look similar to other stock cars and I've had no issues with ltft.

[solidONE]

Originally Posted by jamesm

http://www.ft86club.com/forums/showthread.php?t=53773

just ignore all of the stuff about port/di ratios. looking at your log it looks to be much improved, but it'll be a lot easier to tell with the data formatted in a more friendly way.

You, sir, are a gentleman and a scholar. Too bad I could not get the excel file to work.. lol I don't think this works with portable excel app.

[solidONE]

Originally Posted by jeebus

I have a catless fp too and my logs look similar to other stock cars and I've had no issues with ltft.

What intake mods do you have and what fuel are you running? 93 or 91?

[jamesm]

Originally Posted by solidONE

You, sir, are a gentleman and a scholar. Too bad I could not get the excel file to work.. lol I don't think this works with portable excel app.

no you'll need the full desktop version of excel. if you don't have that, let me know and i may have some alternatives (particularly if you're on a mac).

[solidONE]

Originally Posted by jamesm

no you'll need the full desktop version of excel. if you don't have that, let me know and i may have some alternatives (particularly if you're on a mac).

Will install the desktop version and try again.

Here's a graph screenshot of the original maf scale compared to my modified maf scale:


No lumps or bumps anywhere.

[Shiv@Openflash]

Originally Posted by solidONE

Will install the desktop version and try again.

Here's a graph screenshot of the original maf scale compared to my modified maf scale:


No lumps or bumps anywhere.

Just curious and sorry if it's already been answered before, but what modifications are you running?
-shiv

[solidONE]

Originally Posted by solidONE

Yup catless J2 front pipe, aFe drop in filter, and trimmed snorkel. All else stock with a 1.42b stg 1 OFT tune.

I did keep a bit more material on the snorkel than shiv and others. Although I'm sure that's not going to change much.

Originally Posted by shiv@vishnu

Just curious and sorry if it's already been answered before, but what modifications are you running?
-shiv

Since I've been doing this after work the ambient temps seems to be lower when I took the logs. I think the new scaling threw the temp compensation off a little as it runs a little leaner during the day vs night time.

Aside from the stuff below everything else is stock.

This filter:
http://afepower.com/shop/details_new...as&&brandID=59

This front pipe that now cost US $1,109.99 lol:
http://www.ebay.com/itm/J2-Racing-Sp...591119&vxp=mtr

And what I did with the snorkel:

[jeebus]

Originally Posted by solidONE

What intake mods do you have and what fuel are you running? 93 or 91?

My snorkel has been trimmed, running a K&N, and I'm on 91. I had no issues with the tune before or after my snorkel was trimmed either.

[jeebus]

I haven't logged in a bit. Decided to take a look today and WTF my AM was at .5? I managed to get it up to .7 but by the end of my drive it was at .2....bad gas??

[solidONE]

Originally Posted by jeebus

I haven't logged in a bit. Decided to take a look today and WTF my AM was at .5? I managed to get it up to .7 but by the end of my drive it was at .2....bad gas??

LTFT takes time settle in, so if you took your last log right after reflashing your LTFT will not be as high as it should and your STFT will reflect this. Unless the new rom you flashed was close to being ideal then there will not be much correction.

Also I noticed during low rpm range and high load, such as lugging your car up a hill in too high a gear, you will more likely see your IAM get cut down. Specially if your fuel map is off (indicated by wildly fluctuating or really high STFT)

What is the diameter of your cat-deleted front pipe? Brand?

[solidONE]

Originally Posted by jamesm

no you'll need the full desktop version of excel. if you don't have that, let me know and i may have some alternatives (particularly if you're on a mac).

Will this excel app work without intake air temps? OFT does not have IAT logging capabilities yet. Hope to see this added soon, along with option to display selected inputs like a gauge(s) with larger high visible readouts.

[jeebus]

Originally Posted by solidONE

LTFT takes time settle in, so if you took your last log right after reflashing your LTFT will not be as high as it should and your STFT will reflect this. Unless the new rom you flashed was close to being ideal then there will not be much correction.

Also I noticed during low rpm range and high load, such as lugging your car up a hill in too high a gear, you will more likely see your IAM get cut down. Specially if your fuel map is off (indicated by wildly fluctuating or really high STFT)

What is the diameter of your cat-deleted front pipe? Brand?

My ltft is at around 2...noshing crazy.. And my stft doesn't wildly fluctuate. Front pipe is Berk. 2.5"