i programmed my first chip this weekend and did about 20 different combinations without a scan tool. i needed a female adapter for the serial port and will purchase this tomorrow for my scanner (datamaster). the problem i had today was trying to understand the ve table #2, what exactly does this table do? does it change the ve for wot changes and add more fuel for a specific rpm? i have no egr so i did these changes first:

What I did to get rid of my EGR as, pre fastbrokers recommendations, changed all the PERCENT EGR vs LOAD vs RPM values to 0%, set the EGR CORRECTION vs LOAD vs EGR DC table to 0 as well and set the EGR %VE Correction vs AF vs EGR DC table to 92.4, which is the "standard" non-EGR BPW multiplier which means that I am running on the Main VE table only (my VE table #2 is set to 0's) and will never have a fuel correction for any EGR signal.

my problem came when i changed the ve #2 table to "o", the engine surged heavily so i changed the bpw constant to 150 and i improved but not much. i then reburned a chip to the original asdu bin ve#2 table and increase the spark table by 15% and left the egr functions as per fastbrokers recommendations. truck runs good now but until i get the scan i have no idea what is happening for the afr, i think it was leaning out with the ve#2 at "0" but thats just a guess. i looked at a 454 bin and noticed the main fuel tables to be much higher than my 350sb asdu bin.

this was my first program so bare this in mind i am learning but can see how addicting this is by diy proms, fun to see the changes!

also, what happens if you increase the bpw to much on the constant tables?

747ecm, stock 350tbi, headers and dual exhaust, open element.

 

The easiest and best way to disable EGR is to set the EGR Enable Temp to 01. Forget all that other stuff.

VE #2 should not be all zeros, how will you control fueling above 3200rpm?

Start over with the stock bin. Disable EGR and go from there.

 

ve#2 is always added to the main table, by putting all zeros you just severly leaned your engine out..
and beyond 3200 rpm ve#2 is always added to the last number in the ve1 cell for that kpa column

 

is what they mean by the ve#1 table added to the ve#2 table and must be below 100? also i realize i have to get my cruise blm to 128 but where do you change or do the wot tuning after getting ve table#1 to 128? i guess what i am saying when do you screw with ve#2 and when do you play with the pe fuel ratio vs rpm table. again is this done only for wot?

i have read all the tuning info and made a book 1" thick and still confused with what exactly they are saying.

 

blm is not used during WOT. Ve1 and Ve2 are ALWAYS -including at part throttle- added together

so for example say your ve1 has 30% in one cell and on the corresponding RPM cell in VE2 you have 22%

that means when you are driving and you are in that cell your fueling is calculated for 52% ve

you can play with the wot AFR table when you start messing with wot, doing plug reads, etc. That table is really for fine tuning, your big wot changes are going to be in the VE tables on the 100 kpa line and on the VE2 line for the higher rpms

PE means power enrich, that means WOT btw, thats only used at WOT and nothing more. Its not an actual representation of the air fuel ratio but rather a calculation assuming what you have in the tables would equal 14.7:1 and thus adds fuel accordingly guessing at what amount of fuel equals the air fuel ratio you desire

 

Pablo, SO WHEN I AM DOING LITE CRUISE FUEL SETUPS I ASSUME YOU ARE TO CHANGE THE VE#1 TABLE TO ACHIEVE 128, CORRECT? BUT WHEN WOULD TOUCH THE VE#2 AT THE SAME LITE CRUISE RPM (SAY 1800-2500RPM) DO YOU ALTER THEM TOO? AND WOULDN'T THIS SCREW UP THE VE#1 ONCE YOU CHANGED IT TO ACHIEVE 128.

THANKS FOR YOUR RESPONSE I APPRECIATE

 

IF YOU CHANGE VE 2 YOU CHANGE EVERYTHING ON THAT RPM ROW! SO IF YOU ARE JUST TUNING P/T YOU MIGHT WANT TO JUST TUNE VE1 UNLESS THAT WHOLE ROW IS UNIFORMLY RICH OR LEAN BY THE SAME AMOUNT SO BAM! BAM! I GOT YOUZ!!

 

now that makes sense, dump question p/t?

also, i am tuning my stock 350tbi bin to get my feet wet so i can then try and tune my new engine. this is the spec on the new engine which is almost built:

383 stroker, 64cc 23deg trickflow aluminum heads c/w edlebrock performer intake and adapter, cam is an extreme 4x4 comp. Cam. 12-235-2 grind ( .447/.462 lift, duration 210 218 lift @50, 111 lobe separation) . unit has hypr. Flattop floating pistons, eagle cast crank, 5.7eagle rods. 10.2:1 comp. Headers c/w 2.5” flowmaster exhaust. 1227747 ecm, asdu.bin.
454tbi c/w injectors.

what is your thoughts for tuning this truck and things i should do for startup. unit has no egr so i will change egr temp on to "01"

 

pt is part throttle and i think you should put that in an F body

other than that
go big on the injectors or fuel pressure and tune just like any other motor.. with that small cam it should be pretty easy. remember to read your plugs