Data Logs! Post them here.

[skyyraiden]

Could one of the wizards in here look at my data-log and help me figure out what my issue could be? Im boosted with an OFT tune, and im having really weird issues with the car cutting out at low RPM. When im driving at around 40mph with light throttle the car "cuts out" meaning a jolt feeling and it feels like the car loses power, but it only happens for a second, then drives like nothing happened. Sometimes it happens once and doesn't for a while, sometimes it cuts out within seconds of the last. I did two logs, one to my destination and one back, run1 is going there, run2 is coming back. I was in boost alot coming back and I dont have any issues in boost, but I added the file for reference sake. On run1, the first time it "cut out" was between 15-25 seconds of the log, second time was at a red light, waiting to turn across traffic to my road. I gave it gas and it started going, then it cut out, so I gave it a bunch of gas because I was crossing traffic. This happened at 445-450 seconds in. Any help would be great. Im trying to use the community to help instead of bombarding Shiv with all this, because other than this small issues the car runs amazing. Link to the log is below, thank you for whoever can help with this.


http://datazap.me/u/usethewahwah/run...6-7-9-10-12-13

[solidONE]

Originally Posted by Tor

I tried and it is thoroughly disappointing!



Okay, the difference is also not that big. I'm up at a max of 31.17 at load 1.2 @6000 rpm. You don't see that in the log as I have 1 deg Timing Compensation per Cylinder A+B throughout up to 6400 and thereafter increasing to max 3.16.

That and the rich mixture up top seems to let it accept that much timing



I suppose this will be okay for the track. Tried to simulate as much as I responsibly could on backroads too:
http://datazap.me/u/tor/tor-232?log=...zoom=3288-5406

And my usual autobahn pulls:



The 5th gear is difficult for it (it's uphill too), but still less than -2 FLKC. Notice in 6th as it accelerates from 5500 to 5600 (uphill, no more punch), it doesn't knock at all.

So that makes me want to try out this next on top of the other changes:



This is within 0.35 to 0.7 deg of E85 timing between 5200 to 6000 rpm at load 1.2!

I doubt this will be suitable for the track. But I want to see how far I can push it and have a 1 pull hero tune ready if I want to get it dynoed. Or maybe I will be surprised at it will work out, or I can maybe try to make changes to TCPC if it knocks.

With the extra-extra timing I will already extend the top area back to 6800 rpm. The MY17 stock tune seems to use this table a bit more actively than older:



Hopefully these changes should provide some actual messurable improvement.

It did hold the power past 7000rpm to redline so its not complete loss. Maybe bumping the timing earlier in the rev band will give you a few more ponies in the middle and toward the 6000rpm range. Or do some more pulls when it's really cold if you want to feel good about your tune. LMAO

[Baron_T]

Originally Posted by skyyraiden

Could one of the wizards in here look at my data-log and help me figure out what my issue could be? Im boosted with an OFT tune, and im having really weird issues with the car cutting out at low RPM. When im driving at around 40mph with light throttle the car "cuts out" meaning a jolt feeling and it feels like the car loses power, but it only happens for a second, then drives like nothing happened. Sometimes it happens once and doesn't for a while, sometimes it cuts out within seconds of the last. I did two logs, one to my destination and one back, run1 is going there, run2 is coming back. I was in boost alot coming back and I dont have any issues in boost, but I added the file for reference sake. On run1, the first time it "cut out" was between 15-25 seconds of the log, second time was at a red light, waiting to turn across traffic to my road. I gave it gas and it started going, then it cut out, so I gave it a bunch of gas because I was crossing traffic. This happened at 445-450 seconds in. Any help would be great. Im trying to use the community to help instead of bombarding Shiv with all this, because other than this small issues the car runs amazing. Link to the log is below, thank you for whoever can help with this.


http://datazap.me/u/usethewahwah/run...6-7-9-10-12-13

I'm pretty new to this too, but I've seen stuff like this in my own tuning. Do you mean what happened right here?
http://datazap.me/u/usethewahwah/run...4408&mark=4385

I'd been seeing stuff like this too. At 448.18 s, at 1034 RPM you had an engine load of 1.35, which is like maximum.
1136 RPM you had an engine load of 0.9, and
448.78 your AFR goes way rich (11's), and stays that way it starts coming back up about 450.41.

Might be a combination of too much tip-in, a shift from CL to OL causing a sudden rich AFR spike, lack of engine load limiter (if you are running v2stg1), and (if you have a manual) dropping the clutch too hard at too low an RPM.

The OFT v2 stg 1 rom did this a lot and I found it pretty annoying. I made it a bit better by doing a few things in "OFT Tune Usefull Information and Tweaks" http://www.ft86club.com/forums/showthread.php?t=74754 (Thanks @steve99!) : "Possible Idle dip and hesitation fix" that @ztan came up with, "Tweak to smooth low down Throttle response", "Bogging or Hesitation at Low RPM HIGH Load", and "Load Limits" tweaks.

The hesitation fix that @ztan came up with really helped a lot for the v2 rom, though I haven't needed it for v3.

For "Tweak to smooth low down Throttle response" the beginning of my Throttle Tip-in Enrichment tables read 0.924, 1.164, 1.316, 1.532, 1.620.

The Bogging changes may help your specific problem. You might have had a sudden shift from CL to OL that made your AFR go suddenly way rich. Shiv's change helped my v2 tune a lot.

For "Load Limits" I put back in the load limits from the stock B01C rom per Steve99: http://www.ft86club.com/forums/showp...&postcount=964

And, well, the last thing I can say is: rev it up a bit higher and let out the clutch smoothly.

[Tor]

Originally Posted by solidONE

It did hold the power past 7000rpm to redline so its not complete loss. Maybe bumping the timing earlier in the rev band will give you a few more ponies in the middle and toward the 6000rpm range. Or do some more pulls when it's really cold if you want to feel good about your tune. LMAO

Yes it does seem so, althought I'm not sure how accurate Virtual Dyno is at high rpm. Most real dyno charts show a sharper drop.

I added the new timing, it still doesn't knock. WTF! Should I add more?

Datazap doesn't accept my log of 3.1 mb for some reason, but here from Viperdata:

[Tor]

Gains! Actual messurable gains! I'm extatic!

[solidONE]

Originally Posted by Tor

I added the new timing, it still doesn't knock. WTF! Should I add more?

yes

you've got your track tune already, so might as well go for a max power tune since you're adding timing anyway. keep adding till you start seeing minor knock corrections!

[Tor]

Originally Posted by solidONE

yes

you've got your track tune already, so might as well go for a max power tune since you're adding timing anyway. keep adding till you start seeing minor knock corrections!

I am starting to hit E85 timing in some cells. I suppose there is no point going beyond that. The table in the background is Base Timing B combined with KCMA, compared to combined E85 timing.



The shape added may look wierd. But it's to blend it in with lower load cells. 3D view of total timing would look like this:

[Wayno]

Copy "CL Delay Maximum Engine Speed (Per Gear)" from any Stock US 6MT or Stock MY17 6MT rom i.e. any rom except Stock EU MY12-MY16.

Originally Posted by Tor

I need a bit of help.

Can someone tell me why I have AFR command of 14.7 here?



Situation:
1) Driving in 5th at at 4000 rpm. Car is rolling with zero accelerator pedal input in OL.
2) I slowly feather in the pedal up to 48%, at 15% it changes to CL and at 26% back to OL.
3) As it changes to OL, AFR command jumps up to 14.7 with a load of 0.99 (in my POL table I have 12.14 at 4000 rpm/1.00 load).
4) As it passes through this 14.7 area, AFR goes up to 13.35 and it starts to pull timing, eventually dropping IAM.

http://datazap.me/u/tor/tor-2312-100...mark=7271-7275

Although the IAM drop is very slight, it's annoying.

Where is this 14.7 commanded coming from?

Thanks.

[Tor]

Originally Posted by Wayno

Copy "CL Delay Maximum Engine Speed (Per Gear)" from any US or MY17 rom i.e. any rom except EU MY12-MY16.

I noticed that change in the EU MY17 rom too and was thinking about copying it over. Now I will definitively do it. Thanks.

[solidONE]

Originally Posted by Tor

I am starting to hit E85 timing in some cells. I suppose there is no point going beyond that. The table in the background is Base Timing B combined with KCMA, compared to combined E85 timing.

That's only assuming the E85 timing is at MBT across the board for your particular setup.

[Kodename47]

Originally Posted by solidONE

That's only assuming the E85 timing is at MBT across the board for your particular setup.

And that E85 flash speed is faster than gasoline, so might be more retarded. Also don't forget that ignition timing is dependant on the injector split ratio.

[Tor]

Originally Posted by solidONE

That's only assuming the E85 timing is at MBT across the board for your particular setup.

Originally Posted by Kodename47

And that E85 flash speed is faster than gasoline, so might be more retarded. Also don't forget that ignition timing is dependant on the injector split ratio.

Thanks both of you. That all makes sense. So it's probably safe to assume I'll reach knock limit before MBT.

I suppose it will take more at 5200/5600 in that case.

[Krazy]

hey guys can someone take a look at my logs and see what's wrong? I recently purchased a Open flash flex fuel kit and uploaded Shive FF kit tune and I m having issues with the FF_Ethonal % reading 85% only and not changing. I am currently on 91. is there possibly something wrong with the tune or the kit?

http://datazap.me/u/krazy/log-1505084783?log=0&data=1

[Tor]

Originally Posted by Tor

Thanks both of you. That all makes sense. So it's probably safe to assume I'll reach knock limit before MBT.

I suppose it will take more at 5200/5600 in that case.

More?

I'm truly surprised that it continues to take more. This is even including some fairly big timing comp per cyl A+B. At the marker there it's -1.05 so add that for true total timing. And -3.16 TCPC up top.

Here a log with several 3rd gear pulls in a row. There is only slight -0.65 FLKC occasionally:
http://datazap.me/u/tor/tor-2322-0?l...zoom=3676-5941

I was otherwise sure that this time I had pushed my luck too far.