Table Request

I know you guys are busy, if you have a chance could you please drop my name in the hat for the following table/feature requests:
I have a guy with a stockish tune, delimited but nothing added... But is badly over fueled at idle. Using other software I found the problem to be in a table called base qty vs tps... The table commands excess fuel at 600rpm. I am not able to defuel that table, so I sped up the idle speed to get out of that over fueled zone. I would like to keep idle at 750rpm to line up the needle of my tach with the 750 tick. I'm a little obsessive... But the over fuel problem is in that table and I would like to drop the idle back down to 750rpm if you could get that table put in to facilitate defuling. Specific os is *5504430, but my my16 os *5493455 as well

Also
Is there already mapped out, a way to rescale injection timing axis? The max mm3 value is 120mm, but would like to change that to 130mm3 and rescale the rest of the cells. I can change the labels, but i suspect thats different than changing the axis, can you confirm?

Similar to the SOI tables being commanded out of range:
If using the torque to fuel tables, and i commanded 130mm3 at the top, how does the ecm handle the injector pulse lookup when the pulse table is maxed at 120mm3

Could you explain a little about how the ecm handles looking up SOI for say a torque to fuel value of 130mm3 when the SOI mm3 axis is maxed at 120mm3. Does the ecm use the same SOI values from 120mm3 column and just inject a hair later if 130mm3 is being called for? Or does the ecm extrapolate from the 120mm3 column outward to fuel 130mm3?


Thanks in advance!

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Interested in this also.

go away jordan:bash:

Just kidding! lol me love you long time:banana:

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Originally Posted by hacklerjason

a table called base qty vs tps...

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E98 was just getting new OS's added at this stage, but we'll keep this in mind when they are being worked on next (like when someone sends in a 2018 Colorado file).

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Originally Posted by hacklerjason

Is there already mapped out, a way to rescale injection timing axis? The max mm3 value is 120mm, but would like to change that to 130mm3 and rescale the rest of the cells. I can change the labels, but i suspect thats different than changing the axis, can you confirm?

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Sorry I'm not sure why they are not showing as axis points that can be edited, it should be possible. I'll look in to that.

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Originally Posted by hacklerjason

If using the torque to fuel tables, and i commanded 130mm3 at the top, how does the ecm handle the injector pulse lookup when the pulse table is maxed at 120mm3

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I would say it just carries the last value through from 120mm3, eg if you have 1100uS at 120mm3 (end of the axis) and you command 140mm3, you will still only get 1100uS.

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Originally Posted by hacklerjason

Could you explain a little about how the ecm handles looking up SOI for say a torque to fuel value of 130mm3 when the SOI mm3 axis is maxed at 120mm3. Does the ecm use the same SOI values from 120mm3 column and just inject a hair later if 130mm3 is being called for? Or does the ecm extrapolate from the 120mm3 column outward to fuel 130mm3?

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I don't think it would assume the difference past 120mm3.

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Originally Posted by GMPX

E98 was just getting new OS's added at this stage, but we'll keep this in mind when they are being worked on next (like when someone sends in a 2018 Colorado file).


Sorry I'm not sure why they are not showing as axis points that can be edited, it should be possible. I'll look in to that.


I would say it just carries the last value through from 120mm3, eg if you have 1100uS at 120mm3 (end of the axis) and you command 140mm3, you will still only get 1100uS.


I don't think it would assume the difference past 120mm3.

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Are you looking for a particular os, or just mentioning for future use?
I have 8112 & 8116 I can send in if you want them... Lmk

Thanks for the insight... I have a guy that has datalogged above 120mm3 but the pulse table capped at 120mm3 which is why I asked. I kind of imagined what would happen on the timing table, that it would just use the same values from the 120mm3 table. But the pulse table is acting strange in that it does fuel outside of the ranges for that table.

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Well if we find the table you are talking about for one Colorado then everyone will want it :grin:
These are very complex (and smart) ECM's, please don't assume we know everything about the full operation of them. In development with remote logging we saw numbers that didn't make sense either, it could very well be that hidden in there is some smart models and algos that pull everything back in to line no matter how far you want to push things outside the boundaries (something that was noted in testing).

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Originally Posted by GMPX

Well if we find the table you are talking about for one Colorado then everyone will want it :grin:
These are very complex (and smart) ECM's, please don't assume we know everything about the full operation of them. In development with remote logging we saw numbers that didn't make sense either, it could very well be that hidden in there is some smart models and algos that pull everything back in to line no matter how far you want to push things outside the boundaries (something that was noted in testing).

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Lol
Did you guys purposely go outside boundaries? Because science? [emoji23][emoji23]

And you know Ross, I'm not sure everybody would want them. My one guy that needs that table fixed, is about +5000ft from sea level. Quite a bit less air... We estimated 15% less... But despite his baro being at around 12.8psi, we were getting fueling over the table values in those zones. I had to use the other tuning environment to check if there was another table pushing fuel other than the torque to fuel.

Only that 1 guy so far I have come across is over fueled at idle for mid elevation. We all have that same table, but at lower elevations our torque to fuel tables are higher iirc than the base qty vs tps table. The band-aid works, but at the cost of higher rpm, which in this case actually turns out using less fuel... Hmmph

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Did GM not get it right from factory?

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Originally Posted by GMPX

Did GM not get it right from factory?

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Not in that table... I'll get a photo in a second... But most people will never be able to tell due to the configuration of their exhaust in factory form. The raw diesel smell will burn your eyes, sinus, any mucus membrane at that... Maybe its more so an intentional emissions deal. There is a need for fuel to get catalyst temps correct. That does explain why there would be a global fueling rate, exhaust temp management

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His complaint was specifically that it idled very rich. No matter what tables i defueled, i couldnt log lower fuel delivery. I like the idle to be at 750, as it accentuates the rumble made when vanes are commanded open at idle. It sounds like a truck and less like a hair drier. With that, the fix/bandaid was idle at 900r vs 750r ... I could defuel as needed with torque to fuel tables, just lost the rumble in the process since its 100r over the rpm i have for when the vanes start to close

Ahh i remembered another inquiry... In Scan v8, data logging the various injections... We have 2 pilots in the ecm calibration that supposedly run but i can only log when one of them is on/off... Specific PID is IEASTAT under GM Enhanced... Is this a limitation of scan v8?

It'll just be the PID itself, GM defined its operation not EFILive.

The table you've shown above I don't think is a base fuel to mm3 table based on TPS for idle, I think it is fuel limiter when torque reduction is active. Obviously I can't see in HPT where you've pulled that from but is it in the Trq reduction group?

I found it in the Main Injection params... I was attempting to defuel by reducing the torque to fuel tables, and i was not able to reduce fuel using that table. I had reduced to a value that should not have run, but continued to idle with no reductions in fuel per datalogs. I was able to get an improvement by increasing rpm to 900, which coincides with what i should be seeing per that "base qty" table. There is something that i am aware of from my experience, that the main torque to fuel tables are way wrong in the other guys software. That is the specific reason i stopped using it on the e98. It does not line up with data logs. The mm3 values are scaled in a way that the tables only show 50% of the value. Anyways that beyond the point... This particular truck, the operator complained about excessive smell, even while in the cab. He is +5000ft elevation, Baro reports 12.038psi. I was able to raise idle speed to 900rpm and there was a large improvement, but still has a lingering smell
Attachment 21927

While not fuel related, I still would like to get the multiplier & adder tables for SOI timing.

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Originally Posted by Tre-Cool

While not fuel related, I still would like to get the multiplier & adder tables for SOI timing.

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That is definitely fuel related, on a diesel[emoji41]


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you are correct, i had my head in "petrol land" as i was looking at some e38 stuff when i wrote this. lol.

Following up

in a couple of months i'm going to be adding another turbo to mine for a compound setup, so I would be happy to test/play around with vane control too if we can get them added over time.

Sorry, we are not currently working on E98 additions at the moment.

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Originally Posted by GMPX

Sorry, we are not currently working on E98 additions at the moment.

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Raja \nnn/

I have no idea what that means :nixweiss:

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Originally Posted by GMPX

I have no idea what that means :nixweiss:

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Roger, but I live in Hawaii and speak a form a pigeon sometimes 🤣🤣
The other one was a Shaka🤙

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Does it mean 'look out for flowing lava?'

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Originally Posted by GMPX

Does it mean 'look out for flowing lava?'

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LOL no
I do appreciate you asking, but I'm safe
https://uploads.tapatalk-cdn.com/201...b79f9a369f.jpg

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LOL nice one, must be a nice view from O'hua.

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Originally Posted by GMPX

LOL nice one, must be a nice view from O'hua.

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It's not what you think lol... I'm far enough I can't see it or smell it

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Hey Ross
I know you said you aren't working on e98 right now, but I would like to add to the list request to see if you have see these tables around in there. I'm looking for a table called brake torque management (for burnouts without having to turn off tcs for the guys that like that kind of thing lol), and any other "abuse" tables. I have 4wd guys out there saying they are getting power limited or cut back when in 4wd low I believe, and are able to get around that by disabling abs by pulling a fuse.

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I know the table you mean from the older gas ECM's, I don't recall such a thing in the E98 though. For what it is worth the E98 software is very different to the usual GM ways so cross referencing concepts is difficult (I believe it is developed by GM Italy).
I can ask around because there is a few tuners who do their own thing with these ECM's via cax.

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Originally Posted by GMPX

I know the table you mean from the older gas ECM's, I don't recall such a thing in the E98 though. For what it is worth the E98 software is very different to the usual GM ways so cross referencing concepts is difficult (I believe it is developed by GM Italy).
I can ask around because there is a few tuners who do their own thing with these ECM's via cax.

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That would make sense, being that VM is also based in Italy. And even to do it with cax files... I have seen the hex, and that isn't my flavor. Someone was able to provide to me a bin file for my exact ecm, he had a way to convert it somehow. I've looked in there and found countless tables but not one means anything to my eyes. I continue to browse through to see if I can make sense of it but I'm also not familiar with those tools either so I'm not sure if I was able to properly utilize them.

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Originally Posted by hacklerjason

I continue to browse through to see if I can make sense of it.......

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I know the feeling :rotflmao:

Another wish list item.

Are there dedicated "exhaust brake" Turbo position maps like there are on the bigger trucks. The EB on these trucks feels pretty weak I am curious what its commanding. Now that I am typing this I suppose I could log it and see for myself.:doh2:

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Originally Posted by BigCE

Another wish list item.

Are there dedicated "exhaust brake" Turbo position maps like there are on the bigger trucks. The EB on these trucks feels pretty weak I am curious what its commanding. Now that I am typing this I suppose I could log it and see for myself.:doh2:

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I've seen mine command 100%
Dsp4 will never see vgt tables, ask me how I know [emoji23]🤣
You can command 100% vane at very low throttle, then command 0% vane for a throttle just ahair higher, then command normal vane behavior while driving. I do this to not require the tow haul mode to be on for EB to function... Pm me if you need help

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I know DSP4 wont get those parameters that's fine.

Good idea on the EB all the time. I have done similar things on LLY/LBZ/LMM and 6.0 stupid dutys. Usually works very well. Plus the tow haul mode drives me crazy so that would solve that problem.

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Originally Posted by BigCE

I know DSP4 wont get those parameters that's fine.

Good idea on the EB all the time. I have done similar things on LLY/LBZ/LMM and 6.0 stupid dutys. Usually works very well. Plus the tow haul mode drives me crazy so that would solve that problem.

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I also dislike tow/haul in that it selects a shift schedule we don't have access to. I dislike how agressive the tcm is when selecting downshifts.... Even when tow haul is off, the tcm will still click down a gear when I double tap the brake pedal lightly... Want to lessen the agression there but I can't see the responsible tables and none of the others respond with the effect I desire

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I am no longer working on the T43, in fact I refuse to :grin:
I can pass it on for someone to investigate but it is very difficult to figure that TCM out unfortunately, it may never be solved.