GMPP tune and tunes in general - Page 2 - Pontiac Solstice Forum
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post #16 of 33 (permalink) Old 08-08-2019, 02:21 PM
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Originally Posted by stevebot39 View Post
I have no idea what this long term learning is all about.
I'm not a tuner, but this is what I've come to understand. Others may jump in with more (or more accurate) information.

The "learning" is all about adjusting fuel trims and ignition timing. The ECM has an initial, generic fuel map indicating what amount of fuel should be injected vs inputs for RPM, oxygen sensors, knock sensors, MAP, MAF and a few other things. Fuel trims are scalars applied to those initial fuel delivery values to adapt to the specific car's quirks and features.

The ECM initially makes an educated guess about what amount of fuel to inject based on the sensor inputs. It uses the O2 sensors to determine if the mixture is rich (too much fuel) or lean (not enough fuel). If it's too much, the short-term fuel trim (STFT) is modified to reduce the amount of fuel injected. Long-term fuel trims (LTFT) are also adjusted, but by a smaller amount over a longer period. (Fuel trims are values that correspond to the adjustment in fuel delivery previously mentioned.)

After resetting the fuel trims by flashing the computer or other methods, the STFT will jump around a bit until the ECM finds a value that it's happy with. Those adjustments gradually affect the LTFT. Over time, both LTFT and STFT stabilize, though STFT will always oscillate a bit depending on current driving conditions, altitude, fuel quality, etc.

For timing: if the ECM detects significant knock, it can retard ignition timing to compensate (within reason). If it gets really bad - like, multiple misfires - it'll go into reduced power mode and angrily flash the CEL. I'm not sure how persistent the timing adjustments are. The tunes also set the ignition timing. For instance, when running an E85 tune, you can advance timing quite a bit to get a lot more power.

Every engine is slightly different. This is the software's way of adapting to those differences.
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post #17 of 33 (permalink) Old 08-08-2019, 02:26 PM
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Originally Posted by raygun View Post
Their tunes are locked to:

1. Encourage vendor lock-in, which is evil

2. Prevent users and tuners from "stealing" their switchable tune feature.

It doesn't have anything to do with liability.
1 - it isn't evil to make money and prevent others from copying your product. I suppose you think GM is also evil for having every GMPP tune tagged to a specific serial number and non-transferable? Or that the entire patent system is evil because everyone doesn't get to copy things for free? Besides, any Trifecta customer can have them fine tune the tune they sold them or they are free to cough up and start again with another vendor.

2 - of course they seek to prevent anyone else from using their intellectual property - what else would you expect. Companies that don't do this get the philanthropy medal - right before they go out of business because everyone is selling pirated copies of their product.

3 - I have it on good authority that one of the considerations was also to not enable 3rd parties to meddle with your tune and then when it all goes wrong the original tune creator gets the blame. I've seen that repeatedly when some idiot that thinks they know how to tune tweaks a tune, blows their engine and blames the original guy that created the tune instead of their own incompetence. Hang out on the Cobalt SS forums some time.
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post #18 of 33 (permalink) Old 08-08-2019, 02:27 PM
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Originally Posted by raygun View Post
I'm not a tuner, but .........................
Why did I expect something about Holiday Inn Express?
Quote:
After resetting the fuel trims by flashing the computer or other methods, the STFT will jump around a bit until the ECM finds a value that it's happy with. Those adjustments gradually affect the LTFT. Over time, both LTFT and STFT stabilize, though LTFT will always oscillate a bit depending on current driving conditions, altitude, fuel quality, etc........
Shouldn't this be STFT will always oscillate.....?
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post #19 of 33 (permalink) Old 08-08-2019, 02:29 PM
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Shouldn't this be STFT?
Yes, you are correct.

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post #20 of 33 (permalink) Old 08-08-2019, 02:36 PM
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Originally Posted by wspohn View Post
1 - it isn't evil to make money and prevent others from copying your product. I suppose you think GM is also evil for having every GMPP tune tagged to a specific serial number and non-transferable? Or that the entire patent system is evil because everyone doesn't get to copy things for free? Besides, any Trifecta customer can have them fine tune the tune they sold them or they are free to cough up and start again with another vendor.
I'm not saying that anyone should be able to copy and distribute somebody else's work, and I certainly don't have an issue with profiting from one's labors. I don't think everything should "free." If I feel a product isn't worth the asking price, I simply won't buy it. I've never asked anyone to just give me a tune for free.

However: I shouldn't have to cough up more cash and start over with another vendor if Trifecta blows me off - a pattern that they've demonstrated multiple times as documented elsewhere. If *I* want to modify *my* tune that I paid for, on *my* car, I shouldn't need someone else's permission.

And, of course: because their tune is locked, you can't just overwrite it. We recently dealt with a friend's car that had a Trifecta tune and were unable to overwrite it. I'm not even talking about reading the thing - we couldn't *write* to the ECM. The friend in question took the ECM to GM, who attempted to reprogram it, and wound up with a basically useless device.

That is, in technical parlance, Not Cool.

We went back and forth with Trifecta over a couple of weeks - because they don't publish a freaking phone number and take their sweet time responding - and were basically told to eff off.

Quote:
2 - of course they seek to prevent anyone else from using their intellectual property - what else would you expect. Companies that don't do this get the philanthropy medal - right before they go out of business because everyone is selling pirated copies of their product.
I work in software these days - if piracy were as rampant as everyone thinks that it is, I wouldn't have a job. That said, software patents are BS. The people that steal the tunes weren't going to pay for them anyway. Point of evidence: see all of the other tuners that do NOT lock their tunes and are (gasp!) still in business.

Quote:
3 - I have it on good authority that one of the considerations was also to not enable 3rd parties to meddle with your tune and then when it all goes wrong the original tune creator gets the blame. I've seen that repeatedly when some idiot that thinks they know how to tune tweaks a tune, blows their engine and blames the original guy that created the tune instead of their own incompetence. Hang out on the Cobalt SS forums some time.
People also blame Starbucks for spilling coffee on themselves. People put blocks of dry ice on their engine to cool it off between drag runs. People chop off their hands with table saws. Ask Gilbert or Martin when the last time was that they got sued over a blown engine.

The idea that locking a tune reduces or eliminates liability is not supported by evidence.

But, hey - to each his/her own.

Blue-ish 2006 2.4, Werks stage 1 turbo, Borla cat-back, DDM braces, Spec aluminum flywheel, Spec stage 2 clutch, Werks aluminum radiator, some gauges, RKSport hood, Morimoto FX-Rs, GReddy Profec, Norm's fenders

'07 GXP, Werks Big Wheel K04 and tune, Solo catless downpipe, TCE Wilwood 6 piston front brakes, 4-piston rears , stainless brake lines, slotted/drilled rotors, BC Racing BR coilovers, Performance Autowerks intercooler, DDMWorks CAI, charge pipes and braces, RPM rollbar

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post #21 of 33 (permalink) Old 08-08-2019, 04:40 PM
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The tune is data driven. The ECM uses a set of rules to determine where in the various data tables it pulls its settings then applies them. It doesn't "learn" because it can't chang any of its own software or data. Once the "tune" is installed and the ECM boots up, if it's an initial start it goes to the "baseline " initial point and "looks" at the data coming from the MAF on start up during the calibration part of the start sequence and adjusts the data points accordingly. If it's a restart- which is almost always the case, the EVM uses its last stop point as its start point then adjusts for the MAF input

All engines that are in mobile devices have some kind of systems that allow them to self adjust for changes in air density. They must adapt to altitude changes and temperature variations that can affect the fuel air mixture

The ECM can only adapt to changes in perveived environment. No learning going on

As the temp goes up, it will change fuel timing and quantity to match changes of air density to fuel delivered The ECM does this for all the parameters it can affect. No learning going on

This ability to change its operating parameters is limited by start cycle. There are two opposing needs in balance. It must be able to adjust parameters but if it is seeing faulty data it may adjust too much and cause running issues. So the amount of change is limited by "start cycle". 5 or 6 cycles caused the stock tune to eliminate the gains from adding a high flow cat

What all tunes do is mace changes to the data used by the ECM to manage the engine, for example adding more fuel at some settings or adding more timing. The tune "enhances" performance by modifying data in tables

The people who designed the engine and the tune initially hit a very conservative power target that was adequate and had. Very large safety factor for reliability. When the GMPP tune followed later it changed the data to achieve a significant improvement in power, at a still high acetylene factor though it was reduced. See failing intercoolers and the odd broken block.

Other tunes that go to higher power levels do so by changing the data tables and come with some level of increased risk

In addition to changes to the data tables, some tunes modify the rules built into the code. GMPP added the no lift shift for example. The changes in RPM limit are I believe data driven

Unless you replace the operating system on the car, all tunes use the same code. They make data changes based on the experience and skill of the tuner

All tunes bring added risk to the longevity of the powertrain

The more power, the greater the risk

So, one could make a case that all tunes are identical in a very fundamental way, the differences are does a specific tuner really know the car well enough to improve performance with an acceptable level of risk

And

Can I maintain this tune

I chose the RPM tune first and had a bad experience. This was in 2009

I then went to the GMPP tune because it is still maintained by them and while it makes comparable performance improvements it's the least risk solution

I was willing to pay more up front with the knowledge it would be more likely to avoid breaking something later that cost more
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post #22 of 33 (permalink) Old 08-08-2019, 04:59 PM
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Thanks for all the info folks as i'm still learning.
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post #23 of 33 (permalink) Old 08-09-2019, 02:25 PM
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...if it's an initial start it goes to the "baseline " initial point and "looks" at the data coming from the MAF on start up during the calibration part of the start sequence and adjusts the data points accordingly. If it's a restart- which is almost always the case, the ECM uses its last stop point as its start point then adjusts for the MAF input.
Call this nit-picking or semantics, but I thought that was the definition of learning.

Anyhow, it does not explain what I think I experienced - a noticeable increase in performance after about 500 miles of driving. My friend said he experienced the same. Or did he just plant that idea in my head and then I imagined it happened?

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post #24 of 33 (permalink) Old 08-09-2019, 03:01 PM
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Originally Posted by stevebot39 View Post
Call this nit-picking or semantics, but I thought that was the definition of learning.

Anyhow, it does not explain what I think I experienced - a noticeable increase in performance after about 500 miles of driving. My friend said he experienced the same. Or did he just plant that idea in my head and then I imagined it happened?
I don't think that you would see a step-change in performance, but I certainly believe that over the first 500 miles the long-term trims are going to optimize and that you will see an improvement during that time.

And yes, that is the definition of learning.

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post #25 of 33 (permalink) Old 08-09-2019, 03:27 PM
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The trims vairy on a “continuous “ basis but are always performing within the constraints of the code. It’s not artificial intelligence which can “learn”. It’s not my definition of learning when it’s tsking a pre selected input value and giving a pre defined output value.

The code is fixed. The values are fixed. The “tune” matches the values of the inputs to the allowable values of the outputs. Nothing happens that is not defined in the code and the data. It’s a basic machine not a learning device in my definition of learning.

If you go back and read the threads about “learn down” the GM engineers did not want to use the term learn but let people use that short hand to make their understanding easier.

NOTHING happens in the code, the data or the algorithms in the code that is not written down and stored. It’s not “making decisions”. Or figuring things out. It’s a Moore machine. If this, then that.

The normal tune. achieves performance gains by changing the data that defines “then that” to achieve gains. An advanced tune may make changes to the actual code, but to do so means you would need the ability to read the compiled code or have access to a version you could operate on to make changes then be able to compile the chanced code and install it.

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post #26 of 33 (permalink) Old 08-09-2019, 03:58 PM
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All learning isn't the same, and the definition can change with the application.

The ECM starts out with default values, and uses short-term and long-term trims to adjust its operation to produce the desired result based on measurements that it makes. Those trims are retained for use the next time it runs because it has learned its environment and the ways that its system varies from the assumed nominal system. It has therefore learned.

It is no different than your behavior when you perform a particular task, but aren't happy with the result. You may do exactly the same thing the second time you do it, but vary the force or speed that you do it. Your "program" hasn't changed, but you learned that your initial parameters weren't optimum, so you adjusted them.

The fact that unpowering the ECM for a period of time "resets" it to the defaults demonstrates that it has "learned" something, otherwise it couldn't "forget" anything.

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post #27 of 33 (permalink) Old 08-09-2019, 08:35 PM
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Originally Posted by raygun View Post
I'm not saying that anyone should be able to copy and distribute somebody else's work, and I certainly don't have an issue with profiting from one's labors. I don't think everything should "free." If I feel a product isn't worth the asking price, I simply won't buy it. I've never asked anyone to just give me a tune for free.

However: I shouldn't have to cough up more cash and start over with another vendor if Trifecta blows me off - a pattern that they've demonstrated multiple times as documented elsewhere. If *I* want to modify *my* tune that I paid for, on *my* car, I shouldn't need someone else's permission.

And, of course: because their tune is locked, you can't just overwrite it. We recently dealt with a friend's car that had a Trifecta tune and were unable to overwrite it. I'm not even talking about reading the thing - we couldn't *write* to the ECM. The friend in question took the ECM to GM, who attempted to reprogram it, and wound up with a basically useless device.

That is, in technical parlance, Not Cool.

We went back and forth with Trifecta over a couple of weeks - because they don't publish a freaking phone number and take their sweet time responding - and were basically told to eff off.



I work in software these days - if piracy were as rampant as everyone thinks that it is, I wouldn't have a job. That said, software patents are BS. The people that steal the tunes weren't going to pay for them anyway. Point of evidence: see all of the other tuners that do NOT lock their tunes and are (gasp!) still in business.



People also blame Starbucks for spilling coffee on themselves. People put blocks of dry ice on their engine to cool it off between drag runs. People chop off their hands with table saws. Ask Gilbert or Martin when the last time was that they got sued over a blown engine.

The idea that locking a tune reduces or eliminates liability is not supported by evidence.

But, hey - to each his/her own.
This is very interesting... Did you know that there is a push from GM to not allow anyone to tune their cars? If this gets passed in courts, and you take your car for service at a dealer, and they find out that you have touched the tune, you get a HEFTY fine!!

Don't believe me? Look for John Deere. They have been taking farmers to court over the "tunes" they're putting in their farm equipment, and it's setting a precedence that GM can follow through with as well as other OEs. If it passes, it would treat your vehicle software like it does any other software...that you decompile and modify it. It will also treat your vehicle, the way John Deere has won in court, that you merely "lease" the car, whether purchased or not, for it's usable life and aren't allowed to modify it in any way.... John Deere technically now still owns all farm equipment "sold" to people now.... Do I agree with it? Yes...it's software. If we want to have laws governing computer software that was painstakingly developed, why shouldn't it apply to vehicle software?

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post #28 of 33 (permalink) Old 08-09-2019, 08:37 PM
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GMPP tune and tunes in general

Yeah, I’ve read that here and elsewhere.

That’s going to be very difficult to enforce. They could do it during annual safety inspections, I suppose.

I’ll just buy a second ECM.

As if I needed another reason to not let anyone else work on my cars...

At the end of the day, there will always be options. Standalone harness and ECM are easily available and not crazy expensive. A bit much for a $7k car, but for any serious application, a couple of grand isn’t unreasonable.


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Blue-ish 2006 2.4, Werks stage 1 turbo, Borla cat-back, DDM braces, Spec aluminum flywheel, Spec stage 2 clutch, Werks aluminum radiator, some gauges, RKSport hood, Morimoto FX-Rs, GReddy Profec, Norm's fenders

'07 GXP, Werks Big Wheel K04 and tune, Solo catless downpipe, TCE Wilwood 6 piston front brakes, 4-piston rears , stainless brake lines, slotted/drilled rotors, BC Racing BR coilovers, Performance Autowerks intercooler, DDMWorks CAI, charge pipes and braces, RPM rollbar

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post #29 of 33 (permalink) Old 08-09-2019, 08:43 PM
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Originally Posted by JohnWR View Post
All learning isn't the same, and the definition can change with the application.

The ECM starts out with default values, and uses short-term and long-term trims to adjust its operation to produce the desired result based on measurements that it makes. Those trims are retained for use the next time it runs because it has learned its environment and the ways that its system varies from the assumed nominal system. It has therefore learned.

It is no different than your behavior when you perform a particular task, but aren't happy with the result. You may do exactly the same thing the second time you do it, but vary the force or speed that you do it. Your "program" hasn't changed, but you learned that your initial parameters weren't optimum, so you adjusted them.

The fact that unpowering the ECM for a period of time "resets" it to the defaults demonstrates that it has "learned" something, otherwise it couldn't "forget" anything.
I completely agree John!!

Newer vehicles DO learn. My Charger's TCM learns. Otherwise it wouldn't leave itself in 6th gear when I'm trying to get fuel mileage. It has learned my driving habits (yeah...I'm a bit heavy footed in it!). It knows that I like power and will downshift manually if I have to, so now, it seems to keep itself in 6th until I hit 50mph. Then 7th at 50, and 8th at 65+. And that's in economy mode. Switch to performance and it's 1 gear lower and never hits 8th gear. My understanding from the Charger forums is that it "develops" a sort of graph and tries to follow it...much like programming the AFR in our cars.

Also with AEVs coming, AI is being implemented more and more, even though we are still years off from full AI.

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ZZPerformance dyno tuned - 286HP, 317ft/lbs of torque at 23psi of boost.
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post #30 of 33 (permalink) Old 08-09-2019, 08:46 PM
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Originally Posted by raygun View Post

As if I needed another reason to not let anyone else work on my cars...

At the end of the day, there will always be options.

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There will not be options if GM and John Deere get their way. Nobody will be able to access any of the data that's stored in your ECM except a dealership. That information will be sent ONLY to them...and nobody else will have the tools to fix your car. If you guys don't want this, I would highly suggest getting involved in the fight!! Follow MEMA news and start watching articles about it.

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Windrestrictor V2 lighted in white
Windrestrictor lighted door sills lighted in white
DDM Works IC Piping
Undercar LEDs in white to match Windrestrictor

ZZPerformance dyno tuned - 286HP, 317ft/lbs of torque at 23psi of boost.
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