Data Logs! Post them here.

[solidONE]

Originally Posted by Silver86K

Here is a datalog of mine:

Any advice

http://www.datazap.me/u/86driver/sas...?log=0&data=20

Originally Posted by G-awesome

After two months of researching and testing, finally got my stage 2 custom tune dialed in with my JDL UEL catted header on Shell 91oct gas! (well 99%...still got a bit of consistent knock in a few areas but I can take a bit of timing out)

http://www.datazap.me/u/gawesome/201...576-669-91-165

I'm running a bit on the richer side during the WOT pulls in the 2000-5000rpm range. Should I adjust it so that it's closer to commanded AFR of 12ish:1 or just leave it as it?

Big thanks to wayno, steve99, kodename47, solidone (and anyone else I missed) that wrote the guides, provided the tools and helpful advice! The knock correction spreadsheet by kodename47 is a fantastic tool to sort out datalogs!

I'm excited to dial my tune in for Chevron 93 octane next!

Just FYI. "Commanded AFR" seems to be read about 0.2:1 leaner than the actual requested AFR on the OL Fuel Tables for some reason. So when your log shows 12.5 Commanded AFR, the corresponding requested AFR on the map is likely closer to 12.3 AFR. Regardless how you've set the fuel mapping the important thing is the resultant AFR is where you'd want it. Your MAF scales can be massaged to either run lean or rich compared to requested or "commanded AFR" in Open Loop.

Another thing to consider is IAT's. Typically the lower the IAT the richer the engine will end up running compared to higher IAT conditions. (assuming an unmolested MAF IAT compensation table) Let's say you have it running perfect at 75~90*f IAT in Open Loop. Once the IAT drops below that you will end up running richer. Conversely, when your IAT go up your engine will run leaner. It's much safer to be a bit too rich than too lean. So keep that in mind when dialing the tables effecting your AFRs and taking logs under different conditions, temperature wise.

[solidONE]

Originally Posted by randomthoughts

http://www.datazap.me/u/randomthough...10-105-115-113

I post it on ECU logging as well.

Doesn't look too bad aside from some minor FLKC at 6k~7k. Look like you've brought the engine up to normal operating temps. I'm sure once you've brought the oil temps up higher you may begin to see even more FLKC. Personally I'd do a LOT more logging and gather more data before making changes. I don't like to make changes base on one single pull alone. Though, if you are uncomfortable with the amount of flkc you are getting you can try pulling a bit of timing from the base ignition advance map b, subtracting 0.34* starting from 5800rpm at 1.0 load and up all the way to redline, then retest. Also, you should be logging engine loads in your logs.

[randomthoughts]

Originally Posted by solidONE

Doesn't look too bad aside from some minor FLKC at 6k~7k. Look like you've brought the engine up to normal operating temps. I'm sure once you've brought the oil temps up higher you may begin to see even more FLKC. Personally I'd do a LOT more logging and gather more data before making changes. I don't like to make changes base on one single pull alone. Though, if you are uncomfortable with the amount of flkc you are getting you can try pulling a bit of timing from the base ignition advance map b, subtracting 0.34* starting from 5800rpm at 1.0 load and up all the way to redline, then retest. Also, you should be logging engine loads in your logs.

Ok thank you. I will do some more logging. I also mentioned in the other thread, I will try running 94 fuel as well when this tank of 91 is done.

[G-awesome]

Originally Posted by solidONE

Just FYI. "Commanded AFR" seems to be read about 0.2:1 leaner than the actual requested AFR on the OL Fuel Tables for some reason. So when your log shows 12.5 Commanded AFR, the corresponding requested AFR on the map is likely closer to 12.3 AFR. Regardless how you've set the fuel mapping the important thing is the resultant AFR is where you'd want it. Your MAF scales can be massaged to either run lean or rich compared to requested or "commanded AFR" in Open Loop.

Another thing to consider is IAT's. Typically the lower the IAT the richer the engine will end up running compared to higher IAT conditions. (assuming an unmolested MAF IAT compensation table) Let's say you have it running perfect at 75~90*f IAT in Open Loop. Once the IAT drops below that you will end up running richer. Conversely, when your IAT go up your engine will run leaner. It's much safer to be a bit too rich than too lean. So keep that in mind when dialing the tables effecting your AFRs and taking logs under different conditions, temperature wise.

oooh that makes sense with the IATs. I experimented with the IAT compensation tables on current revision which explains the AFR running richer. It was running the way I wanted it on the previous revision. Thanks!

[solidONE]

Originally Posted by G-awesome

oooh that makes sense with the IATs. I experimented with the IAT compensation tables on current revision which explains the AFR running richer. It was running the way I wanted it on the previous revision. Thanks!

Yeah, I'm still playing with the compensation myself. I think I have it pretty stable at temps under 90*f where the AFR doesn't go much richer in cold temps. I haven't had a chance to really get it dialed in for hotter temps since I started to mess with it again this past winter. I've added quite a bit of compensation for higher temps but it's still going lean at temps above 90*f. If it doesnt work out, I will probably have to make my OL fuel targets richer to avoid going leaner than 12.5:1.

Most of the guys that have messed with the table pretty much gave up on it and reverted back to stock.

[Rezi]

Uhm, could someone explain me why the IAT compensation tables affect the AFR?
So that would mean, even if i "play" with the Base Timing B table, i am changing literally the AFR?

[solidONE]

Originally Posted by Rezi

Uhm, could someone explain me why the IAT compensation tables affect the AFR?
So that would mean, even if i "play" with the Base Timing B table, i am changing literally the AFR?

The MAF IAT compensation controls how much fuel gets added or subtracted according to intake temps. It has nothing to do with timing. I believe you are thinking about the Ignition advance IAT compensation. they are totally different tables.

[Rezi]

Originally Posted by solidONE

The MAF IAT compensation controls how much fuel gets added or subtracted according to intake temps. It has nothing to do with timing. I believe you are thinking about the Ignition advance IAT compensation. they are totally different tables.

Oh, my bad. Yeah i tought you guys are talking about Timing Compensation (IAT)

But another question. How is it then possible that i am running under WOT leaner now? My previous tune had the same MAF-scaling, nothing had been changed on the car (same IAT). Only pulled some timing because of knock.

I am currently running about 12.4-12.1 AFR NA under WOT. The power feels better than running richer. Dont know if it is safe.

A guy with the same tune has almost the same modification as mine, but is running about 12.0-11.7 AFR at WOT, lol.

[solidONE]

^ I've made the same mistake. lol

If you dont have anything in your exhaust that is sensitive to the increased heat due to running leaner AFRs (eg catalytic converters), and if there it's no knock then 12.5:1 is not unsafe, IMO. I'd try to keep the AFRs at or below 12.3:1 as much as possible even without cats in the exhaust. If your LTFT go lower than previously then you'll obviously run leaner in OL operation. It's also possible that you are flowing more air or less fuel than your friends car. No 2 injectors or air filters etc are exactly the same. Who knows? maybe your friends air filter is dirty compared to yours. lol

[Rezi]

Originally Posted by solidONE

^ I've made the same mistake. lol

If you dont have anything in your exhaust that is sensitive to the increased heat due to running leaner AFRs (eg catalytic converters), and if there it's no knock then 12.5:1 is not unsafe, IMO. I'd try to keep the AFRs at or below 12.3:1 as much as possible even without cats in the exhaust. If your LTFT go lower than previously then you'll obviously run leaner in OL operation. It's also possible that you are flowing more air or less fuel than your friends car. No 2 injectors or air filters etc are exactly the same. Who knows? maybe your friends air filter is dirty compared to yours. lol

Stock-Exhaust (cats) except roar cat-back. HKS air filter and intake duct. Its only weird why it runs on tune 1 richer, on tune 2 leaner. Almost same values except base timing b and some timing compensation iat

LTFT is also the same, if not little more near 0% than previous. Also to mention that my midpipe is leaking between the frontpipe. But this shouldn't affect the afr?

http://datazap.me/u/rezi/190320164?log=0&data=1-7-13

This is the only flkc over -1, only between 6000-6500rpm. I pulled about -1 degree near the cells and gonna test it later.

[solidONE]

Originally Posted by Rezi

Stock-Exhaust (cats) except roar cat-back. HKS air filter and intake duct. Its only weird why it runs on tune 1 richer, on tune 2 leaner. Almost same values except base timing b and some timing compensation iat

LTFT is also the same, if not little more near 0% than previous. Also to mention that my midpipe is leaking between the frontpipe. But this shouldn't affect the afr?

http://datazap.me/u/rezi/190320164?log=0&data=1-7-13

This is the only flkc over -1, only between 6000-6500rpm. I pulled about -1 degree near the cells and gonna test it later.

Since you still have your cats in the exhaust, I'd try to bring the afr down closer to 12:1 or richer for the sake of preserving those expensive cats.

[Jonathanlim]

Hey guys. I just installed a grimspeed intake. Ever since then I've been having some cold start issues. When starting up its hesitant to start and then eventually stalls itself. On the 2nd crank it starts up fine. Does anyone know what's wrong?(MAF rescaling)
Thanks
http://datazap.me/u/jlim7/cold-start...log=0&data=0-5

[G-awesome]

Originally Posted by solidONE

Yeah, I'm still playing with the compensation myself. I think I have it pretty stable at temps under 90*f where the AFR doesn't go much richer in cold temps. I haven't had a chance to really get it dialed in for hotter temps since I started to mess with it again this past winter. I've added quite a bit of compensation for higher temps but it's still going lean at temps above 90*f. If it doesnt work out, I will probably have to make my OL fuel targets richer to avoid going leaner than 12.5:1.

Most of the guys that have messed with the table pretty much gave up on it and reverted back to stock.

that is very good to know! buuut I think I'll revert the IAT comp back to stock to get it closer to what I had before at around 12ish:1. It definitely explained why my exhaust fumes had a much heavier unburnt gas smell after all the pulls I did.

[solidONE]

Originally Posted by Silver86K

Here is a datalog of mine:

Any advice

http://www.datazap.me/u/86driver/sas...?log=0&data=20

Check out this thread, in case you dont know what to look for in your logs.

http://www.ft86club.com/forums/showthread.php?t=69871

Also, I'm curious about your setup. What kind of hardware are you running? Aftermarket intake?