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Default 09-05-2015, 02:38 PM

Ideally DME torque should be above 30 in the log, or above 600lb/ft. The trick is keeping DME torque up while also eliminating whatever is causing the mapped timing drop.


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Default 09-05-2015, 02:43 PM

influence of lean AFR on timing drop in this log:
each time your AFR surge in the lean side, your timing drops, then recover, then drop because of AFR surge again ...



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Default 09-05-2015, 02:59 PM

Put dme torque in the same log.


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Default 09-05-2015, 03:08 PM

Quote:
Originally Posted by Terry @ BMS
Ideally DME torque should be above 30 in the log, or above 600lb/ft. The trick is keeping DME torque up while also eliminating whatever is causing the mapped timing drop.
Yeah, that's the problem. I think we're missing tables in the XDF or the TCU is doing something to request torque cut.

Possible to share the damos stuff? or do you think this might be tcu related? This is running with the alpina coding.


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Default 09-05-2015, 03:14 PM

Quote:
Originally Posted by Terry @ BMS
Put dme torque in the same log.
I don't have the csv file, it's one of the screenshots NYT published in page 1.


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Default 09-05-2015, 03:20 PM

Quote:
Originally Posted by trebila
I don't have the csv file, it's one of the screenshots NYT published in page 1.
No, those were someone else's logs. I posted the CSV's with my logs.


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Default 09-05-2015, 03:55 PM

This is what I'm going to be running with in the interim to avoid the issue, though it grossly under reports torque.



I'll post a log running this after I go for another drive.


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Default 09-05-2015, 05:12 PM

too little torque there, issues flooring it in second. going to try at 185 load


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Default 09-05-2015, 07:50 PM

So, it's tricky. It's at a point where I'll get slippage in second, but no timing pulls elsewhere. I have some ideas I'll have to test another day, like running the load target flat at 185 and/or adding more torque to the load to torque table in some places.

This is what I'm running now.. I really wish I knew what limit I was running into :/




Slipping in second:



Third gear:


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Default 09-05-2015, 08:19 PM

I also think torque eff divisor may in fact be a divisor and not a factor table, so reducing values actually increases torque, but I'll need to verify that. Going to try this next, then make changes to the load target and load to torque limit tables as necessary. Should be easier to hit predicted values this way. I miss programming standalones where I can make changes in real time and not have to flash :/



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Default 09-05-2015, 09:25 PM

How was Dmac able to run such high torque numbers when doing the level 10 testing without running into this? Is that i8a0s vs ije0s? If so, given the same TCU coding, this would likely be a dme issue hitting some limiter that isn't mapped.


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Default 09-05-2015, 10:08 PM

Quote:
Originally Posted by nyt
I also think torque eff divisor may in fact be a divisor and not a factor table, so reducing values actually increases torque, but I'll need to verify that. Going to try this next, then make changes to the load target and load to torque limit tables as necessary. Should be easier to hit predicted values this way. I miss programming standalones where I can make changes in real time and not have to flash :/
The torque eff divisor is factor. Higher values increase calculated torque at the respective lambda value all else being equal. With single turbos we routinely run 1.2 to 1.3 values across the board, for example, to get calculated torque over 700lb/ft.

I suspect whatever you are fighting is Xi specific and stemming from a torque reduction request from the trans. This might be a function of calculated torque as well.


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Default 09-05-2015, 10:42 PM

Quote:
Originally Posted by Terry @ BMS
The torque eff divisor is factor. Higher values increase calculated torque at the respective lambda value all else being equal. With single turbos we routinely run 1.2 to 1.3 values across the board, for example, to get calculated torque over 700lb/ft.

I suspect whatever you are fighting is Xi specific and stemming from a torque reduction request from the trans. This might be a function of calculated torque as well.
interesting, so this likely limits the xi platform

I was guessing about the divisor as I often saw then diverging very similarly.

seems it's a fine line between slipping and timing pulls based on calculated torque at this power level. hopefully I can get a happy medium dialed in.


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Default 09-05-2015, 10:45 PM

does using fua lower the load as well or just ecu psi?


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Default 09-05-2015, 10:45 PM

I'd search out some flash only Xi logs that include calculated torque to compare note with. It's entirely possible something is just wrong with your car. e.g. trans is sensing slippage and requesting the torque drop.


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Default 09-05-2015, 11:12 PM

as I increase calculated torque it cuts like crazy every second like in the videos, if I decrease it goes away. I don't see or feel any signs of slipping, but I'll try to hunt down some logs and compare.


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Default 09-06-2015, 01:09 PM

Quote:
Originally Posted by Terry @ BMS
Put dme torque in the same log.
Hi Terry,
How do you do this?

Thanks


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Default 09-06-2015, 01:42 PM

post here the csv file .


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Default 09-06-2015, 06:36 PM

This is where I am after some tuning today. No pulls, but I'd like to get the torque numbers up more still. Going to add 5% to the load to torque table at 162 and 185 and test some more. It may be my imagination, but it seems to do better with factor tables pulling down the values from the load to torque table as opposed to running a lower load. It also seems to help keep those factor tables flat. Anyway, I've bumped up the 162 row to be closer to the 185 row so the higher torque values are reached sooner, and I've changed some values there slightly. More tweaks to follow. I'm going to bring this up as high as I can until I see pulls, then back off 5%. I'll post the tables I end up with in case anyone cares.





I did log some slippage on one 3->4 shift where I shifted early.



update: I added 5% and a few other changes after a few pulls didn't see any timing hits. Added 5 more and will likely get some more tests tomorrow.


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Default 09-07-2015, 05:23 PM

Still increasing torque. I've bumped it up a few times, and am on my 9th revision, modifying the load to torque tables. These are the current logs, the current table, and the difference from the factory table. Second gear holds solid and I'm not seeing timing pulls. Will increase another 10% and test some more.










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Default 09-07-2015, 09:15 PM

So after bumping the last table by 10% I was hitting the limit hard. So the last posted values seem to be good, going to run them for a while.


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Default 09-08-2015, 01:08 AM

and don't change load anymore.


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Default 09-08-2015, 04:01 AM

so what was the final changed tables that really helped to solve the issue? the load to torque table or also the torque reduction and torque Eff and load request ?


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Default 09-08-2015, 07:54 AM

All of the changes seemed to have helped. The load to torque table changes add more torque below the 185 row as well as in the 3000 and 3500 columns. The flat divisor tables keep the values from jumping around at different afr.


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Default 09-10-2015, 10:46 AM

Any new finding? After testing it for couple of days is your issue totally solved?


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