CK5
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My TBI computer chip programing thread/adventure.

Mine seems to be averaging 16inhg.
Then that coresponds to your log and checking the one I just tuned. All kpa to vacuum calculaters I have tried and the one you posted are wrong!

Go back to stock timing table or just put Daves in! he gave it away here in this forum, use it!

Then drop the second VE table for idle. Bet that will get you in the ballpark.
 
Well its not to say they are wrong, its just that our map sensors are backwards-ish. The way i keep thinking about it in my head is, the further from 100kpa the map reading is, the more vacuum the engine is producing. 100kpa=WOT, 0kpa=maximum vacuum.

Now about the ve tables... Call me crazy, i dont know how i did it it but somehow, in all my research, reading, dave posting tables, etc, etc, i had somehow convinced myself that the second ve table only kicked in above 3200rpm... Yep. So i pretty much have been ignoring it! Infact, come to think of it, i think now that every time i have removed say, 20% from ve1, thats really only 10% off the combined table! Farty fart! I gotta say thats quite the impressive brain fart on my behalf. So, now im off to go back and look for daves post that had combined ve tables and zeroed out ve2.
 
Turns out, his is for a international motor... So can i just add the two numbers together for whatever given cell? Or is there a bin out there with a combined "stock" ve table?
 
Here are a few screen shots that should help combining the VE tables. Lots of information with the pictures.

dave w

VE1 and VE2.jpg

VE1 and VE2_02.jpg

VE1 and VE2_03.jpg
 
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Now about the ve tables... Call me crazy, i dont know how i did it it but somehow, in all my research, reading, dave posting tables, etc, etc, i had somehow convinced myself that the second ve table only kicked in above 3200rpm...
I have read that too several times but I think it's a third gen thing... not true on 7747. I have made changes there live many times at idle with instant results. :dunno:
 
Ok, so i can just highlight each rpm row I'm ve1 and add the ve for that rpm from ve2? Sweet! I'll work on that. What about the 0 rpm block? 0 it or leave it at what it is?
 
And the tables above 3200 in ve2 just zero them also?
Yes

How does it know what to do in those rpms?
The ECM will operate at the last VE table it was on when above 3200 RPM. Not much will change in the VE above3200. It's not a big deal if you routinely operate below 3200 RPM. If you routinely need VE's above 3200 RPM, upgrade to the '427 PCM.:waytogo:

dave w
 
Sounds good! I'll let you know how it goes! Also, when I remove fuel should i remove timing as well?
 
Also i just burnt my "third try" chip. This one, i combined the ve1+2 tables, took out 25% of fuel at idle, bumped my closed loop idle speed up 100 rpm, lowered the min BLM to 90, and added 3* of timing at idle. We'll see how that does and go from there.

EDIT: Also, i realized that with the ve tables not previously combined, when i took out 20% i was actually ony taking out something like 10%. Or less maybe because the numbers arent the same in any given matching blocks! I think thats accurate but im terribly tiered right about now. So i expect to see bigger "results" by making changes in the ve table now then i was in the past!

EDITEDIT: Just did some (tiered) calculations. For this example i took the VE1 400rpmX50kpa box. Long story short, when previously i would take away "20% of fuel" there, i was actually only taking away 7% from that total block! Madness i say! Anyway, im off to bed.
 
Also i just burnt my "third try" chip. This one, i combined the ve1+2 tables, took out 25% of fuel at idle, bumped my closed loop idle speed up 100 rpm, lowered the min BLM to 90, and added 3* of timing at idle. We'll see how that does and go from there.

Those changes will "for sure" change the data log!:waytogo: I would expect the average idle BLM will move closer to 128.:popcorn:

dave w
 
Well, i think its at a "best yet" point, but i thikn it still just wont wont run right. If i hold the rpm at about 1500rpm it will go up and down from there over and over again from 1400-1600 rpm or so. Also, it seems to run pretty rough in gear. Idle in park is not the glass smooth that i want but i could live with it. Kinda thinking im going to run with this tune until i actually get it back on the road.
 
Oh yea, data loggs, duh... hang on.

THere we go. These are in order. Each one represents slight changes as i would start and stop the logger each time i pulled the chip to adjust something. On the second to last one, i took out too much fuel as you can see by the blms. also, the last one and the third to last have the same tune.
 

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Screenshot of final adjustments. BPW is still stock at 135.

thirdtryfinal.jpg
 
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