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  1. #1
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    Default D1SC 12 rib going on a stock LT1

    Well I decided to bail out on my nitrous kit after I found a killer deal on a complete D1SC procharger setup. It came with the upgraded bypass valve, fmic setup, 3.40" and 4.25" head unit pulleys, 3 belts and what looks like to be a 7.65" crank pulley (haven't measured it yet) with the crank pulley spacer. Its complete with all hardware, brackets etc. I did some math and it looks like using the 4.25" pulley should net me 9.5 psi. Is this right or does this setup make 8psi?

    Currently I have an ASP under drive pulley. Is there a recommended pulley to use in combination of this setup? Other than that, I think I'm pretty much good. I want to get it running on the 24x pcm to prevent predetonation because I know that would kill the bottom end at 8 psi - might even do meth injection down the road. My biggest hang up right now is I cant decide between throwing the complete T56 swap I have sitting around in or go with a 4L80e conversion. This will help me decide what cam to go with. Looking for any advice here as it is my first time messing with boost. I know it sounds crazy boosting a stock engine but I have a couple low mile bottom ends sitting around and I'm not looking to make crazy power. Think 450+ at the wheels will be just fine for me











    Last edited by KLaBZ28; 03-03-2016 at 12:28 PM.

    95 Z28 hard top - LT1, 4L60e, bolt ons, Yank SS3600, suspension, viking coil overs, 3.42 10 bolt, 3320 lbs - 12.304 @ 108.52mph 1.69 60'
    08 Saab 9-7x - L96 6.0 swap, L92 heads/intake/TB, LS6 cam, LS9 springs, 7.425" hardened pushrods, CAI, 1-3/4" stepped LT's, catback, 4L60E, FTI 3000 278mm converter

  2. #2

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    8psi and a SBE?

    I predict some broken ring lands in your future.
    Correlation does not imply causation.

    Una salus victis nullam sperare salutem

  3. #3
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    Default

    Kudos for recognizing that the stock ignition and pcm are not up to the task.
    I believe the 24x will improve longevity on a stock short block. Misfires due to low spark cause knock aka the craptispark. That and having to cobb job a tune to make it run.
    I have personally wanted to test this theory. Funds and other priority's...

    IMO you dont know how much boost it will make until the blower its on the car. You can ballpark it though. Either way tuning it would be rich with low timing.

    Looking back, or having a second car to try it on I would,
    Run 58x crank reluctor and run a 6l80. Driveshaft cross-member verter and trans to engine mount would need a change. But if building from scratch not a big deal.

  4. #4
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    Default

    I would absolutely confirm the pulley sizing for obvious reasons. I would recommend meth only to help keep things cool.

    97 T/A Ram Air Convt - 10.2@140 / 777rwhp - Forever Dyno Queen
    17 Corvette Z06 - 11.05 @ 125
    17 GMC Sierra Denali Dmax

  5. #5
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    Default

    yeah meth is definitely happening, to prevent shownomercys predictions haha. The head unit pulleys are confirmed at 4.25" and 3.40". Its the crank pulley I haven't measured yet..

    95 Z28 hard top - LT1, 4L60e, bolt ons, Yank SS3600, suspension, viking coil overs, 3.42 10 bolt, 3320 lbs - 12.304 @ 108.52mph 1.69 60'
    08 Saab 9-7x - L96 6.0 swap, L92 heads/intake/TB, LS6 cam, LS9 springs, 7.425" hardened pushrods, CAI, 1-3/4" stepped LT's, catback, 4L60E, FTI 3000 278mm converter

  6. #6

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    Meth cools intake charge and adds octane but I believe straight water will pull more heat out of CC.
    Correlation does not imply causation.

    Una salus victis nullam sperare salutem

  7. #7
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    Default

    Quote Originally Posted by shownomercy View Post
    Meth cools intake charge and adds octane but I believe straight water will pull more heat out of CC.
    E85 could be another precaution.

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  9. #8
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    Default

    E85 depends where you live. My area is a dead zone for it.

    Cometic makes LT1 head gaskets up to 0.098"... smooth out the stock chambers, copper spray the crap out of a thick HG, and roll the dice. There are guys on yellowbullet doing crazier things.

    There was a guy over on LS1tech who made just a little under 800whp corrected on all stock hard parts and 2-bolt block (stock rod/main bolts). He was at a high altitude so the correction factor was pretty big, but it was still 650+ uncorrected. Motor was rebuilt with wider clearances in the low 20's and it lived for a while but didn't see over 5800rpm which is probably the only reason it did.
    96Z M6, ERE-383 #60, AFR 210s, LE cam, 9", Procharger D1, ???whp
    95 Roadmaster T-56 swap, LE1s, baby cam, 4.56s, "The Cammaster"
    95 Firehawk hooptie, bolt-ons and suspension

  10. #9
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    Default

    Yeah this guy: http://ls1tech.com/forums/single-dig...-altitude.html

    E85 is not an option up here really. I'm not going for any records here guys, just want to have a little fun on a budget. It already does low 12s with bolt ons so I'll be happy in the low 11s for now. Just got to keep it alive. I have the means to make some serious power on a built engine in the future, or get an LS style bracket.. Well see. Couldn't pass up a D1..

    95 Z28 hard top - LT1, 4L60e, bolt ons, Yank SS3600, suspension, viking coil overs, 3.42 10 bolt, 3320 lbs - 12.304 @ 108.52mph 1.69 60'
    08 Saab 9-7x - L96 6.0 swap, L92 heads/intake/TB, LS6 cam, LS9 springs, 7.425" hardened pushrods, CAI, 1-3/4" stepped LT's, catback, 4L60E, FTI 3000 278mm converter

  11. #10

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    [QUOTE=KLaBZ28;458764] I want to get it running on the 24x pcm to prevent predetonation because I know that would kill the bottom end at 8 psi -

    So with the 24x system you cannot get detonation, is this what you are saying?

    [QUOTE=gmpowered;458766]Kudos for recognizing that the stock ignition and pcm are not up to the task.
    I believe the 24x will improve longevity on a stock short block. Misfires due to low spark cause knock aka the craptispark. That and having to

    Stock ignition would be pushed to its limits, but the stock pcm is not up to task?? I have been running boost since 97 on a STOCK pcm, past supercharged with 648 rwhp and now turbo with 710 rwhp, if you know what you are doing in the tuning dept, it can be done...

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