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I tried to edit my post but apparently deleted it instead...
Basically I said I "think" that M178 file is not stock. I don't have an oem to compare but some parts of it that suggest it has been...

I'm not sure if it's the write that does it, but if I had to guess I'd say it's the HP Editor itself is screwing up the tune once you make a change. If it were the write then I'd assume it would...

I have the factory data, but it doesn't cover details. It's a repair manual for a grunt that says xx code means you should check plugs xyz and if that fails replace whatever part, the end. Those...

Read my last two paragraphs: https://forum.hptuners.com/showthread.php?106235-2014-E550-Learning-to-Tune&p=776160&viewfull=1#post776160

Not saying this is your particular issue, but I suspect it...

It's not GM, but I have tried to find anything car specific and struck out. Basically what I deciphered myself is all the info I have.

The readiness I'm not worried about, never had an issue...

I too wonder, but people usually vanish and we don't get to hear about what worked or didn't. This is probably the biggest reason I post so much, because I know how hard to was when I started tuning....

Thanks Mechanic :)

Lots of info but still confusing. I assume that's generic info? Because some of does not apply to my current car.
Not sure what a drive cycle is but I would assume from a...

On my car a 100% throttle command nets 86.7 at the throttle. 85.5 to 87 is the max I see on other benz, which I assume is what the sensor sees when the throttle is against the stop. The most I've...

I would like to resurrect this thread because I have questions.
First; I get Permanent codes (per HP) and they go away on their own almost instantly if fixed, or I can clear them with a scanner....

Not sure if this will help since my car may work different, but on mine the LTFT are what they are in a few seconds. I can make drastic changes, or add E85, doesn't matter. Once the O2's kick on...

That file looks almost stock, worse actually. I'm sure veeefour, can hook you up, but if you're like me and you prefer to do it yourself, I attached what my first attempt would be.
Your eng is...

The data has random delays so it's pretty hard to tell what is happening when, so you either let off first, or it cut power and you let off a fraction of a second later. By looking at it I'd say you...

In that picture, where you have the line, I'd say you let off the gas.
Prior to that, on the far left where that double hump is, I'd say you hit the rev limiter. You hit it, it shut down, shifted,...

Do you have this selected?

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I had always assumed an HP tune did NOT correct the checksum, therefore I cannot pass smog in California where the smog station checks for that, but I'm just assuming.
So does it or does it not?
...

Here's my guess.
I'd lower my temps with the cooling fan too. No point in starting a run when the eng was as hot as possible. I also set the trigger to Water, no oil, so it responds quicker
...

All my channels are active on the screen, and all oem. Some are math, but based on oem channels. There are a others I'm recording too, but don't appear on the screen. Eg; knock sensor voltages...

That's a lot on the Torque to Load imo. Plus it looks like it kicks in abruptly?
What fuel are you using?
Fyi here's what my Scanner looks like, if you want to upgrade:

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https://forum.hptuners.com/showthread.php?98507-2017-C63S-File-Sought&p=693653&viewfull=1#post693653

For me, when floored, the throttle stays open and boost does all the work. Originally, however, the throttle would close too. It was difficult to figure out if the tranny was closing the throttle, or...

OkEvolution; I suppose you could check out the forum at MHH Auto. Lots of people in there with common mistakes, and lots of people who know a hella more than I do about this stuff, so maybe someone...

What do you mean by "I need to play with the OT and see if I can pull this out without sacrificing boost in the higher gears." Just curious really.

There is a forum; MHH Auto, that is kinda dark...

It won't hurt to try using the Scanner since it just reads. The patch to use the Editor is where people get in trouble. Bricking the ECU applying the patch is one, but I also wanted a copy of my ECU...

I will be of zero help, but maybe you/someone could explain why this RTD exists? I looked it up and it seems to be an HP version of MyGenius?
So it's for people who don't want to tune it...

It's fun trying to get answers outta this place huh? While I can't give you a 100% sure answer, I'll give you what I can:
HP claims it'll read data via the Scanner without the patch, which I...