Preferred PCM: 8625, 7427, or 6395

[dave w]

Dave, you list bins for '7427 with 4L60E and 4L80E but which bin/adx/xdf would you start/use with a 700r4.

A modified $OD .bin / .xdf / .adx works well for a 700R4. http://www.gearhead-efi.com/Fuel-Inj...Information-0D

dave w

[stew86MCSS396]

A modified $OD .bin / .xdf / .adx works well for a 700R4. http://www.gearhead-efi.com/Fuel-Inj...Information-0D

dave w

Before I knew any better, I suppose $0D .bin w^^^700r4 mods could be used in a '8625 w less a$$ pain! I went on the premise of "run what you brung" so leaned on modifying the $E6 for 700r4. The screenshots dave w provided in the link I posted ^^^as an fyi I ended up changing 32 parameters in tp locating them with ctrl+f any search term I could think of related to 700, tcc etc. Used compare tool to see what if anything was changed and copied into second tp session w $6E opened. Don't forget Efan control was also added to your $6E, too.

[In-Tech]

Hiya folks, using the search I just found this thread. I am working on a 94 bbc suburban with a 502, still tbi. The first issue was the 02 voltage toggling between ~450 mv to over 1 volt with just the key on. I grabbed a spare red/blue (6395) assuming they are all the same but maybe not, o2 toggling was gone so at least it is not in the wiring. I haven't driven it yet to see if it will control the 4l80e but I was having some weird issues with the electronic IAC so it dawned on me to research a little.
After reading Dave's post I will hunt down a 7427 and try next week when I am back to work and post what I find.

[myburb]

I have 94 burb bb 454, aluminum intake unheated, upped fuel pressure, ported heads, headers and .500 lift cam. It came with 6395 and that is what I use but have swapped 7427 in and no difference. I did a lot of tuning in the beginning but haven’t burnt a chip in two years. It is a daily driver and runs great. I run in open loop with auto iat correction.

[In-Tech]

Thank you for the feedback, much appreciated. I assume your 94 has the 5 wire IAC? From memory it seems I have swapped between the 7427 and 6395's in the past but that could very well have been 350/4l60 stuff with the switched EGR. I have dyno tomorrow on an '03 cammed 5.3 that I just installed a whipple, then hospital up at UCSF on Tuesday so I won't be doing anymore testing on this one till Wednesday but I will post back what I learn. Thanks again.