I've read so much it's all starting to run together, but my AutoProm and new chips came in today, so hopefully, playing with it this week end will make more of it start to gel.

My plan is to start slowly with the VE tables, and branch out from there. Basically follow the relevant portions of the sticky FAQ articles.

However, one of the things I noticed while playing with TunerPro RT is that it supports comparing 2 bins. With so many different constants, tables, and flags to choose from, and really not understanding very much of how they interact, I was wondering if anyone had a fully tweaked bin they could share (or link on the net) so I could see examples of what was done for other vehicles by people who know what they are doing. I know that I can't just grab and use those bins, but seeing what sorts of things the experts are tweaking would really help me focus AND give me topics for forum searches and such.

If anyone cares to provide bins or guidance, my first 2 projects are detailed below. Obviously it is unlikely that anyone has exactly the same config to provide bins for, but anything similar will still give me stuff to compare in TP and look into further.

Project 1:

88 TBI 350 in a K5 Blazer
46mm TB with unshrouded injectors.
1/4" injector spacer.
Stock small block injectors.
14-16 psi FPR (may go higher with VRFPR)
AirAid TB spacer.
Crane compu cam 2030 roller (Summit CRN-104221)
Roller lifters and roller tip rockers.
SR Torquer heads decked 0.020 and mildly cleaned up.
Stock ZZ4 short block. (~9:1 compression).
Stock emissions with 2.5" single exhaust.
40 series FlowMaster muffler.

Project 2:

Stock 89 TBI 350 from a K20 Suburban.
2.5" single exhaust.
Custom free flow intake.

Project #1 obviously is needing a chip much more than project #2, but I have read that the factory calibration is really bad, and with the changes from stock like Th350 instead of 700R4, no VSS, and radically different gearing and weight, I expect it will improve things quite a bit.

Any help or suggestions appreciated. Otherwise, I'll just dive right into it tomorrow.

Thanks…

 

I just realized, I should probably specify more than just 7747 ECM.

The chip I have is marked "AKAJ 1147".

I figure that corresponds to the 1227747/L05/akaj1147.bin at DIY-EFI?

Is it safe to start with the downloaded bin rather than read the stock chip?

How does that differ from the 1227747 42/akaj1147 42.bin?

 

Hmmm, and another thing, just to make sure I'm on the right track. Which def file?

I see two that might work on the moats/DIY-EFI file sites.

747.ecu
747-mine.ecu

or maybe 42.xdf?

There is also "7747 and 8746 ALDL patch.zip"? Looks interesting, but not sure I "get it" yet...

I'll do some searching on that when I get back from dinner, just wanted to throw this in just to get a head start in case search does not turn up anything.

 

use the akaj 1147.bin

and the 747.ecu

the 747-mine.ecu is prolly a modified

 

Thanks, those were my "best guesses" and are the ones I've been playing with and poking at. But it's great to have some validation of that guess.

Any idea what the "42" designations are about? Some sort of hack?

Man, I've searched, and read, and tried to dig out specifics on my own, but it's amazing how little detail there is at that level (like simply getting the right bin and ecu/xdf) discussed here. Searching on those file names yields almost nothing at all (and nothing useful). And diffing the text files yeild MANY differences, making it clear that they are not interchangeable, but not which I should use.

Sheesh, maybe things will get easier once I'm over the initial learning curve, but there is certainly a high barrier to entry. Obviously much better than the days of hex editors and raw binary spelunking, but I had expected it to be easy at this point.

 

im guessing the 42 designates a different 'mask' i did a comparison between the two for you but no differences came up. so u should be safe either way. the reason you may not be getting much help is that the l05 and your ecm in particular never came in any third gens, so not much people here have any knowledge on those bins.

hope i helped though.

 

You've been a great help, thanks for taking the time. I hate to ask too many newbie questions, but search is not helping me much (probably for the reason you mention). Funny, but I thought 7747 was a fairly popular/common ECM, I guess I was wrong. <sigh>

Either way, I guess I'll loose my EPROM virginity tomorrow if all goes well. My first goal is to simply do the EEPROM conversion and get a stock BIN running from EEPROM, then I'll start logging, emulating, and mod'ing from there...

Thanks again. Your verification on those starting files makes me feel a lot more confident of getting things working from EEPROM quickly. I really can't afford for it to be down too long, and going from EPROM to EEPROM is pretty much a one way trip (within reason), so I wanted to be sure.

 

FWIW, the K5 is now running on it's first custom EEPROM chip, albeit with a stock akaj1147.bin inside it. Surprisingly, given my generally inept efforts so far, it worked right off the bat. But WOW, that stack with ZIF is like a small high-rise in there! I think when finish programming and remove the ZIF, the cover should go back on with something like a 1/4" spacer to keep out some of the dust...

Now to get the autoprom logging, and then emulating for custom tuning...

 

Now it is time to log some data while driving around. I like to use WINALDL. I like using the wide average to get the VE tables set. I typically run the VE tables up near the 4,000 rpm range. Then use a wideband and do the WOT higher rpms. I never go higher than 3,500 under part throttle anyway. You have to remember that to do the BLM corrections you need to add the two VE tables togather(lets say 80 MAP and 2,000 RPM), multiply by the correction factor, then subtract VE 2 from it at that RPM, then put the number left in VE1.

The 7747 is a very common ECM, lots of guys with Internationals have converted their V8s to GM TBI and program them. I use the 7747 as well and the 8746 sometimes.

http://www.geocities.com/ecmguy.geo/bruce/prog_101.html

http://www.diy-efi.org/gmecm/ecm_info/1227747/

Spk747_3 is about the most complete definition file.

http://www.diy-efi.org/gmecm/papers/tunetip.html