7747 $42 1989 Chevy 4X4 need help tuning...FINALLY!

[CFI Z51]

"AMUU was superseded to ASDX". best to start with the latest factory update...

Try this for a starter bin ..stock ASDX bin, with a modified timing table and patches applied (spark/bpw in data stream),egr/hiway cruise are disabled..

[Psycho_Daleic]

Thanks CFI

[Psycho_Daleic]

Burnt the chip that CFI Z51 uploaded (stock ASDX bin, with a modified timing table and patches applied), loaded it into the zif modded 7747, did some data logging. Man what a difference, both log AND feel where as different as night and day. Now I have run a second data log, dumped it into the Excel worksheet and am going to burn the chip/log again.
My questions are these.

1. Do I use the averaged corrected BLM table or the non_averaged?
2. What patches, if any, do I remove after the tuning is where I want it?
3. Do I enable Highway/EGR when I'm done?

Thanks for the assist in advance. I will upload the final modded bin for comments when it's done. (Also thinking about making a tutorial with pic's for the complete noob such as myself, from beginning to end with the steps I took to get to the final product.)

[hammertime371]

Not sure if this will help you but i had much better tuning success zeroing out ve2 table and adding it to ve1 table. Not everyone does this but there are some great posts here explaining this.

[CFI Z51]

Amazing what a little timing will do for these old trucks ...

Dave W has a more aggressive timing table for the 7747 posted HERE..if your looking for even more performance...

1)..you want to use the averaged table for ve ..some hand smoothing will most likely still be needed as the spreadsheet tends to overshoot at times..and yes add ve1 an ve2 together as hammertime suggests as it will speed things up ....
2)..the patches don't need to be removed.
3)..yes you can enable egr and highway lean cruise when you get the ve table where you want it ,
personally I leave them off,as most of my tuning is more for performance then economy/emissions ...

[Psycho_Daleic]

Exactly how do you add VE1 and VE2 together? The truck is running well, but I would like to continue to tune for in town economy.
The only problem is that at around 3600rpm entering the freeway, there is an occasional stumble and afterfire/backfire though the exhaust.

[CFI Z51]

Here Is some reading for ya...

https://www.google.com/?gws_rd=ssl#q=site:gearhead-efi.com+ve1+ve2