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Thread: need some input on the tune - 408ci first base tune

  1. #1

    Question need some input on the tune - 408ci first base tune

    greetings, attached is the start-up/base tune along with a short cruise and 1-2 upshift WOT pull log/scan. i understand the injectors are maxed so my buddy's in process of getting 60lb injectors. here's the rest of the mod list:
    70s chevy vega
    bored and stroked 408ci that was originally a 364 6.0
    stock ls2 intake manifold with massive CAI and cone filter in the fender
    cheap headman's long tune headers
    compression ratio is 11.1:1
    LS1 NA Stage 4 cam from lunati 235/242 with 111 LSA
    PRC heads
    the wideband was installed in the tailpipe and using LM-2 wideband
    TH350 with 3500 stall with 3.73 gears

    i realize the lean at the bottom of 2nd gear based on the LM-2 AFR registering +16. i also understand since the widebands in the tail pipe the reading is reading leaner by +0.5 to 1.0ish?
    trying to figure how much to adjust in the MAF range
    2002 vega 6.0l Pablo 408ci 20250501 23 from 13.hpt
    pablo 408 WOT 6.hpl

  2. #2
    Senior Tuner
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    The VE is in pretty rough shape on this. This car would do much better tuned in SD and not using the MAF
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  3. #3
    thanks for the response. the VE is indeed rough, its a rough draft and still working out the kinks. the car doesnt stall at idle or in drive. im not very familiar with SD tunes as i have majority tuned with the MAF unfortunately. once the higher injectors go in i'll retune both VE and MAF

  4. #4
    Tuning Addict edcmat-l1's Avatar
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    That's not a rough draft that's just rough. And wrong. Might not stall but it can't run great.

    Cylinder volume isn't correct.

    Didn't really look at anything else.

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