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Thread: procharged 383 with '96 efi only runs 14's @ 96

  1. #1
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    Default procharged 383 with '96 efi only runs 14's @ 96

    hey guys! I'm new to the forum and very green on efi, so some well intended guidance will be greatly appreciated. I've got a '96 c1500 that I stroked and poked to 383ci. Without boring you guys I'll try to list as many details of my combination as possible. I think my biggest problem is the stock ecm and stock fuel injection( spider style sfi). I'm thinking of converting to a blow-through carb setup, but maybe you guys can help me out first.

    3/4 ton 4 bolt block
    scat steel crank
    eagle h-beam rods
    hypereutectic slugs (9:1 cr)
    edelbrock e-tec heads 170cc
    small cam 110/120@.050 .513 lift
    fully rollerized valvetrain
    jet maf
    bbk 85mm tb
    procharger p1sc w/intercooler 7lbs of boost
    th400 trans. w/2200 stall
    gearvendors over/underdrive
    .410:1 final drive
    mickey thompson et streets 28"

    My truck has run a best of 14.0@96 elev. 2200'. It weighs 5000lbs.
    I had it tuned by the best guy in my small northern canadian town. (He's the only guy! LOL) Shouldn't it be quicker? One guy posting here says his fullsize 4x4 is running 12's with a v6!!!I know my heads and cam are small but the truck tows my ski boat and my camper at the same time so big horsepower parts won't really work. Sorry i left little to no info on my pcm tune but like I said @ the start of the post... I don't know s#!t about the laptop tuning!
    Any help would be hugely appreciated. Thank you in advance.

  2. #2
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    What was the 60' time? 96mph is low for this combo but it does weigh 5000 lbs.

    Do you own EFI Live? Any tune can be made better. Lets get started.

  3. #3
    Lifetime Member ChipsByAl's Avatar
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    If you are running the stock 1996 PCM, EFI Live won't tune it. Did you update to the newer 0411 PCM? If you haven't it would be a good idea since Boost is accounted for. If so post the file.
    Al
    "Trash that carb and get Injected!"

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    Thanks for taking the time to help guys. The guy who tuned my truck uses superchips software. He is a technician at a local GM dealership so I assume he knows his stuff. To ChipsByAl, please tell me a little about the 0411 pcm. Yes I am still using the stock pcm, it has no fuel/timing maps above 5500 rpm. If I do upgrade my pcm will my puny 19lb injectors keep up to more rpm? On the 60' time, my local track is really rundown so no 60's or 660's. I can only guess and that won't help!

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    Lifetime Member Aloicious's Avatar
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    the PPE forum will be a great asset if you're modding an L31 vortec.
    http://www.pacificp.com/forum/index.php

    read the two stickies for info about the 411 pcm swap, and if you're interested in upgrading your 19# poppets to some real injectors then read the other sticky about the marine intake manifold swap. good stuff over there. I've done both the 411 pcm swap, as well as something simmilar to the marine intake MPFI and would highly suggest both.

    if you're tune isn't very good, then that is very possibly a majority of the problem...do you know what your injector duty cycle is? you may be running out of fuel too with that 19pph drip system from GM.
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

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    Mr. Aloicious.

    You have shed light where there was only darkness. The marine intake and 411 pcm may be exactly what I need. Thanks so much for the info. No-one up here( Prince George, Can. ) is running high horse efi set ups so reliable information is hard to come by. I'll keep you posted on my progress!

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    Lifetime Member Aloicious's Avatar
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    Quote Originally Posted by tommytooslow View Post
    Mr. Aloicious.

    You have shed light where there was only darkness. The marine intake and 411 pcm may be exactly what I need. Thanks so much for the info. No-one up here( Prince George, Can. ) is running high horse efi set ups so reliable information is hard to come by. I'll keep you posted on my progress!
    no prob man, lots of very knowledgeable folks over at the ppe forums, feel free to ask questions over there, but I'd suggest reading the both stickies first, they're long but will answer alot of questions. if you're planning on doing your own tuning, the 411 and efilive is the way to go, and this is a great place to learn tuning. IMO EFI is the best, if you are able to control it correctly, no matter what power level you're running.

    BTW that truck of yours sounds sweet, you'll like it alot more once you're able to fuel it correctly. I hear those prochargers are very good units too.
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

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    Joe (Moderator) joecar's Avatar
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    tommy, welcome to the forum...

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    Aloicious

    I realize that the marine manifold will solve my fuelling issues but would you happen to know the rpm range. I will spin the motor to 6000 if the 411 allows me. Thanks again for your insight. If this works and is affordable it'll be the best piece of info that I've learned in a decade of hot-rodding.

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    Lifetime Member Aloicious's Avatar
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    Quote Originally Posted by tommytooslow View Post
    Aloicious

    I realize that the marine manifold will solve my fuelling issues but would you happen to know the rpm range. I will spin the motor to 6000 if the 411 allows me. Thanks again for your insight. If this works and is affordable it'll be the best piece of info that I've learned in a decade of hot-rodding.
    the 411 will let you spin it to 8k if you tune it to, plus it runs a faster processor, and the tuning tables have more resolution, allowing for finer tuning detail. the 96-98 blackbox have an RPM limit of around 5800 I believe, no one has been able to fix that, even with tuning, it seems to be hard wired into the programming. the 411 swap is fairly cheap and easy as long as you have a way to tune it, like with efilive, it can be done for around $100-150 or less if you find some deals, its just a matter of getting the 411 PCM, connectors, and a couple of pins and wire to splice in, then you just simply repin the wires from the blackbox connectors to the 411 ones, with a couple splices. it took me a total of about 8 hours to do in a 19* unheated garage. I would suspect that it could easily be done in 3-4 hours if everything is prepared beforehand.

    the marine intake can be a bit more expensive, mine isn't an actual marine intake but the folks who are doing the marine intakes say it will run usually from $700-$1000 for it. the threads in the ppe forum have all that info on it. as well as places to get them from and details of what need to be done for them.
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

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