Data Logs! Post them here.

[tomm.brz]

it s not the end of the world if you have -10% ltft, open loop pull seems good anyway

[73TORANA!]

Originally Posted by Sideways

Hello all,

Can someone please have a look at my logs? Car feels good, but I am getting negative LTFT. Checked for leaks and can't find anything. Thinking of playing with MAF scaling.

2nd gear WOT log:
https://datazap.me/u/sideways/log-16...1&data=1-7-8-9

Perrin intake, OFH, Perrin OP, Invida Q300 CB

Thank you.

If I could get an AFR log like that with ZERO knock and only -2.34 LTFT constantly across the RPM range I would be rapt. Not sure about the -10 LTFT on over run, do you have a pop tune or similar? Trouble with changing the MAF scale is its gunna effect WOT AFR due to a change in LTFT.

[boundaras]

Hello everyone
can anyone give me some suggestions for improvement？please
3rd gear WOT log:
recorded using Tactrix（tuned using RR）
HKS highflow filter;72mm TB;red intake manifold;tomei UEL header withnot cat;FP with 2res and highflow cat
curious about tip-in-enrich i got all the time，even idle……
https://datazap.me/u/boundaras/log-1...&data=11-12-21

thanks~

[freerunner]

Originally Posted by boundaras

recorded using Tactrix（tuned using RR）
curious about tip-in-enrich i got all the time，even idle……
https://datazap.me/u/boundaras/log-1...&data=11-12-21

Adjust your logcfg.txt to grab data for tip-in instead of tip-in-enrich. T-I-E is a constant IIRC.

The correct tip-in is zero almost all the time and only spikes down occassionally on accelerator movement.

[boundaras]

Originally Posted by freerunner

Adjust your logcfg.txt to grab data for tip-in instead of tip-in-enrich. T-I-E is a constant IIRC.

The correct tip-in is zero almost all the time and only spikes down occassionally on accelerator movement.

thanks!

[softail]

Hi,

It's an 86 from 2013, stock air filter and stock header.
I'm on Wayne's rom E85, lean -2.
I don't understand my IAM remains at 0.98 while my ethanol is around 80%. This is the first time that my IAM has fallen. It has always remained at 1 even with Ethanol at 65%.

Does anyone have an idea?

Here are two logs, one a wot and one normal.

https://datazap.me/u/visclo/log-1695232857?log=0&data=1

https://datazap.me/u/visclo/log-1697888228?log=0&data=1

Thanks.

[tomm.brz]

Originally Posted by softail

Hi,

It's an 86 from 2013, stock air filter and stock header.
I'm on Wayne's rom E85, lean -2.
I don't understand my IAM remains at 0.98 while my ethanol is around 80%. This is the first time that my IAM has fallen. It has always remained at 1 even with Ethanol at 65%.

Does anyone have an idea?

Here are two logs, one a wot and one normal.

https://datazap.me/u/visclo/log-1695232857?log=0&data=1

https://datazap.me/u/visclo/log-1697888228?log=0&data=1

Thanks.

remove some ignition timing from table Base timing B
under 2000rpm and over 7200rpm and sjould be good

tune looks good on your car i wouldn t touch anythjng else
anyway it s not a big deal 0.98 you still get basically full timing everywhere you could easily ignore specially if you are running e85 could not even be a real knock

[softail]

Originally Posted by tomm.brz

remove some ignition timing from table Base timing B
under 2000rpm and over 7200rpm and sjould be good

tune looks good on your car i wouldn t touch anythjng else
anyway it s not a big deal 0.98 you still get basically full timing everywhere you could easily ignore specially if you are running e85 could not even be a real knock

Thanks, ok I will do that.

[RToyo86]

No physical log at the moment but is it normal common for LTFT to change quite a bit in heavy traffic?

Warmed up LTFT sits around +3 to +5 but jumped to +12 in traffic then ended up back down to +5 range once I was able to get moving again.

[mkodama]

Anyone have any ideas why I'm a bit down on power?

Rebulit my 2017 FA20 in April 2025 with higher compression ratio, had 3 track days already without issue, but did a dyno yesterday and I'm down double digit power compared to before the rebuild(stock compression ratio). E85 freeway mileage is as good as 91AKI mileage, and cold starts happen first try now, so that's good. I'm trying to learn the software/tuning part of things now, so any good links for reading appreciated.

13.5:1 CP Carrillo pistons
Open Flash Tablet E85 tune
JDL headers, over pipe, front pipe, no cats

https://datazap.me/u/mkodama/log-174...4?log=0&data=1

[Ruben_86_]

Hello, I am learning to read the data of the logs to be sure that everything works correctly, the only "problem" I see is a LT fuel trim of -10 for a long time.

Anyone who knows more than me can tell me if it's normal?

-Oft stage 2+
-tomei EL headers
-fp hks
-catback miltek
-k&n filter in oem box
-custom carbon intake tube
-new oem spark plugs

https://datazap.me/u/ruben-saiz/lanz...=0&data=1-2-10

thanks

[tomm.brz]

ltft is ok
just take maf scaling from 0v to 3v and reduce it of 5% everywhere


but remove those knocks (flkc) see what rpm and load they are present (negative flkc i mean) and remove timings from Base timing B table

[tomm.brz]

Originally Posted by mkodama

Anyone have any ideas why I'm a bit down on power?

Rebulit my 2017 FA20 in April 2025 with higher compression ratio, had 3 track days already without issue, but did a dyno yesterday and I'm down double digit power compared to before the rebuild(stock compression ratio). E85 freeway mileage is as good as 91AKI mileage, and cold starts happen first try now, so that's good. I'm trying to learn the software/tuning part of things now, so any good links for reading appreciated.

13.5:1 CP Carrillo pistons
Open Flash Tablet E85 tune
JDL headers, over pipe, front pipe, no cats

https://datazap.me/u/mkodama/log-174...4?log=0&data=1

make it leaner and raise ignition advance

[mkodama]

Originally Posted by tomm.brz

make it leaner and raise ignition advance

Sounds scary, but I’ll try. Thanks!