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    Specific ECU FLash tuning questions

    To start, here is a very short list of my mods:

    3.75L
    dual td05/td06 20g's
    stage III heads
    FMIC
    550cc injectors (currently upgrading to 1200cc's)
    3.75" Z06 maf in blowthru
    anything else needed to support this stuff

    when i began logging with my 550's, everything was generally fine. start/cruised like a factory car with just the injector scaling and batter voltage latency changed to fit my denso 550's. i messed with the antilag a bit and built 8psi easily. the follow questions are based off this limited experience.

    ** i understand that the last cell takes the value of whatever comes after it **

    -load
    there is a limiting (safety) switch for load. i know this, and i generally understand how it works. My question comes in with, does anything else access this table? i wasnt logging 2-byte load at the time so idk what numbers i was hitting, however, i maxxed out the table before 6000rpm's consistently. if i gave only 70% (just throwing out a random number) throttle then i could rev it out all the way to redline. if i kept it floored, i would get to about 5700rpm (changed with temperature of the air outside, obviously) and it wouldnt go any higher... like a soft cut of sorts.

    to restate, my question is if i change this table, does another piece of code work off this "fuel cut double mod" table? is there a reason why i cant just change the load to like 500 (its 198 at the 6000rpm cell)? what about the "target engine load table A/B"?

    -AFR
    so greg, you said to use the VE efficiency table to change fuel. well, with 1200cc injectors, changing even 1% is DRASTICALLY different than someone with more commonly sized injectors (550's or even 680's). should i use the big high octane table and just modify my fuel that way? i am fine with doing it like that, just seeing if there is another way im not thinking of...

    -airflow
    so my airflow maxes pretty much immediately.

    here is a log of a 1-2-3 pull i did. the rpms are stopping around that 6000rpm mark, and ignore the knock... it was 9 counts at the highest. it was one of my first pulls.



    the dark blue line is my airflow, and you can see that it is maxed almost immediately (looking on my computer, its around 4100rpm in 2nd and 3rd that it maxes). do i need to change my "maf smoothing (VE) table"? again, i understand it takes the VE of that 1600hz cell for the rest of the RPM's

    -antilag/launch control (same thing in this)
    my questions with this have to do with how things are labeled in ecuflash. i am going to list all of them and a 'dumbed down' version of what i think they mean. please correct me if my understanding is wrong, because i think it is on one or two of them.

    - stationary rev limit: this is one i am confused on. right above it is "rev limit (normal)" so does stationary rev limit mean that during launch control, it cannot go above this limit at all?
    - stationary limit switch speed: the launch control wont activate over this speed (mph)
    - minimum throttle %: you have to exceed this number for launch control to activate
    - antilag start rpm: it will pull the amount of timing you tell it to in the "antilag ignition retard" section
    - antilag ignition retard: this is another section im not sure about... is this telling the ecu to "pull this much timing from the current timing" or is the ecu setting timing to the amount you put in this box? for instance, if i have -10 in the box, is the ecu pulling ten degrees of timing from the amount it runs normally, or is it setting timing to a set -10 degrees while in launch control?
    - antilag ignition retard limit: the way i understand this, timing will get pulled to this limit at the very most, but again, is timing being set to this at the "stationary rev limit" or what? linearizing between the start rpm and the rev limit? i hope im making sense.
    - antilag AFR: the "AFR" you want your engine to shoot for while in launch control. its not an ACTUAL AFR, its just a reference... you can make it leaner or more rich

    i know you told me once greg to go with the settings you have already in there, but because of my engine and turbo size, its just not a good match for my car... so do you have any personal recommendations for my specific setup? i have some settings in mind already, and i would like to see how they match up.

    sorry for the book folks, but these questions have been eating at me for some time. i am reading merlin's huge PDF on tuning evo's and in general i have been reading a lot about tuning. i have a good grasp on it all, but these things are still cloudy for me. i will gladly try to expand my thoughts on any of them if i was not clear enough the first time (especially the launch control section).

    thanks for your constant help, greg. VERY appreciative! many a beer will be bought for you at NG
    Last edited by futurevr4man; 02-10-2013 at 07:56 PM.
    rise and rise again until lambs become lions

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