Boost tables

[jman093]

Ok, here's my problem with background info. Sorry in advance for my complete ignorance on OB1 tuning.

One of my 2 $700 TGP purchases has a different turbo on it. No luck identifying what turbo, but it's making more boost than stock. Much faster than my stock TGP. Since hooking up the wastegate the PO never attached, I've never had the ECM hit the boost limit on the street. But I went to the dragstrip last night, and the car is hitting the ECM's boost limit around the 1000 ft mark limit which cuts the engine fully for about a second and sets an overboost DTC. Car could only go 15.4 @ 80mph. It was doing 90mph by the 1000 ft mark, but was slowing down after that from the factory tune shutting the fun down. I think the car should be good for mid 14s in current setup if I can get the stock boost limit raised. I don't think I need to raise it much.

I have a Moates APU1 and running Tunerpro v5. I claim complete ignorance over this program. To me, DHP on OBD2 seems easy and straightforward to use, but I really don't understand what all this xdf adx ads 8F$ file stuff is, and unlike DHP bins I've tuned, most of the parameter tables are difficult to comprehend. Eventually I'd like to figure this all out and datalog and tune properly, but all I want to do at this time is raise the stock boost limit a couple psi so I can burn a chip and see what this junk will run in current state. Pic below is what I'm looking at as far as boost tables. I haven't a clue what needs changed to raise the boost limit. Any help is appreciated.

[Guest]

It's been a while since I looked at $8F anything, but there should be a fuel cut parameter that is set to somewhere around where the boost cut was taking place. This should also be paired up with a fuel enable, that is set just below the fuel cut point.

[jman093]

Thanks for the response. I don't see that anywhere. There seems to be a ton of parameters missing. These are the only 4 parameters I have for air/fuel and there's actually no spark tables anywhere. Am I doing something wrong here with this program. Basically all there is is those 4 A/F parameters, the BLM stuff, those bottom boost tables and some V5 compressor controls.

[Guest]

Try another XDF, I have found with $8F (and part of the reason I avoid it like the plague), is that the XDFs are very incomplete and not one has all the parameters that have been defined together. I set out once to make an as complete as possible XDF for $8F, but found very little information on where the tables scalers and flags are, outside of many of the incomplete XDFs floating around. I know for a fact that at leats one XDF has the fuel cut limit vs boost (or whatever it's called) defined and spark tables defined. Also I've seen some pretty odd names used for things like spark and main VE tables, so it may be there, just under a name that doesn't really explain what it is at first glance.

[jman093]

That's actually just what I was trying here. I found another on gearhead-efi.com. The boost section is larger and it contains an "overboost fuel cutoff restore pressure (psi)" and an "overboost fuel cutoff pressure (psi)". The restore is 6.24psi, which is logical, but the cutoff says 2.50 psi, which makes no sense. I'm lost. Where are places I could find an accurate and complete $8F xdf? The first I was using was from tunerpro.net and this one, as mentioned, from gearhead-efi.com.

[Guest]

It sounds like the conversion is off, or the ECM looks at the restore PSI and adds the cut PSI to it, which is not how I understood it to work.

[jman093]

It has to be off. The numbers of everything from fan on/off temperature to idle rpm aren't sensible. Really need a working $8F definition.

[robertisaar]

here's the latest one I have, but like I mentioned on w-body, it still isn't quite there. 8F is more or less 6D with a boost patch anyways, so what i'll likely do is take my 6D complete XDF and change item locations and be most of the way finished.

this XDF has a few things in it that either aren't functional or unnecessary. for scalars, at the bottom is a boost cutoff bypass that isn't necessary anymore, at the bottom of the tables are some extra VE and spark tables that I was making space for in anticipation of patching in 3-BAR support, so at the moment, they don't actually do anything.

https://www.dropbox.com/s/4rjt93iql1teyry/8F%20complete%20V1.06.xdf?dl=0

[jman093]

Thanks for being a badass, Saar. That's is definitely the most complete of all the $8F definitions I've come across, but I guess that is not my problem. The parameters are still not logical anywhere. This one has two overboost cutoff pressures. One at the previous 2.50psi and another listed as 55.86 kpa, which do not convert to eachother. Data all over the place is still not logical. I threw up the aforementioned fan temps and idle speeds as an example in the pic below. Notice the fan temps are not logical or and neither are the idle speeds given. I pulled another bin from another TGP of mine and everything is the same.

Not sure what could be wrong. I seem to be the only person to have this issue. I read threads like this and wonder why everyone else's stuff is all hunky dory.

http://www.tgpforums.com/index.php/topic,2800.0/nowap.html

[Guest]

These are bins you're pulled yourself from MEMCALs?

You might have an offset wrong or something like that which will put the data at the wrong addresses, which could explain why the numbers are so off.

I usually look at some 3D maps and if they look proper, then I can be pretty confident that the read was fine.

Have you tried downloading and looking at known good $8F bins to compare?

[jman093]

^^^^^^^^^^^^^^THIS^^^^^^^^^^^^^^^^^^^^^

Thanks, that's my problem. Have a bin that works now. Although I can't seem to figure out what offset I'm supposed to set it to for downloading a bin properly. Seems like it should be 0000 to 7FFF, but that doesn't work.

[Guest]

What size EPROM are you reading from?

It could be that you need to use 8000 to FFFF. GM sometimes used 512 EPROMs, although rare.