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14s possible tbi l31

This is a discussion on 14s possible tbi l31 within the Performance forums, part of the General Discussion category; Originally Posted by 1998454 Your a complete total idiot. Come back with just one thing to back your mouth up! ...

  1. #81
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    Re: 14s possible tbi l31


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    Quote Originally Posted by 1998454 View Post
    Your a complete total idiot. Come back with just one thing to back your mouth up! I have seen numerous threads with other members calling you out and you NEVER back it up. Anyone can claim to be the best.
    If you were to use the search function rather than run your mouth you would see my TBI builds, track times, and dyno runs.
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

  2. #82
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    Re: 14s possible tbi l31

    Quote Originally Posted by Fast305 View Post
    A big block/marine TBI unit is 660 cfm and still flows just over 600 cfm wet at 1.5 in/hg. At a mere 32 psi a 61# injector is good for 350 HP at 85% duty cycle. If he were to find a set of 80# injectors from a 454 they are good for over 460 HP at 32 psi.
    There were 454 injectors that were 67-72pph at 32psi. The 80# units I had were at 13 psi and locked before getting to 35psi. Replaced them, they failed too.

  3. #83
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    Re: 14s possible tbi l31

    Quote Originally Posted by Fast305 View Post
    If you were to use the search function rather than run your mouth you would see my TBI builds, track times, and dyno runs.
    I did...didn't see you mentioned. I hope the OP removes this thread and seeks info elsewhere.

  4. #84
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    Re: 14s possible tbi l31

    This was the Reed custom cam, ported vortec head, single plane intake dyno through a 700r4, 2-piece driveshaft, 8.5" 10 bolt and even had the mechanical fan on it.



    This was a different setup with ported vortecs, LT4 cam, 1.6:1 rockers, and a performer RPM intake.




    This is what the engine made with stock TBI swirl ports, an edelbrock 3704 intake, big block TBI, 1.6:1 rockers, and headers.



    Last edited by Fast305; 09-01-2013 at 11:39 PM.
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

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    Re: 14s possible tbi l31

    Quote Originally Posted by 1998454 View Post
    There were 454 injectors that were 67-72pph at 32psi. The 80# units I had were at 13 psi and locked before getting to 35psi. Replaced them, they failed too.
    VA454SS did not have your issues with his 489. Don't mean to get rude, but something was wrong with your injectors or you had bad ones.
    Last edited by Fast305; 09-01-2013 at 11:44 PM.
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

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    Re: 14s possible tbi l31

    Quote Originally Posted by tolow4phathoes View Post
    Cheap fast reliable pick only two lol end of day sbc is cheaper to hit my goal. But like aways it isnt enough. I'd love a boosted 418 with twin hairdryers. Ls aftermarket is hitting hard hell you ca make 500hp using oem heads.
    500 with oe heads was passed years ago. Most budget builds are over 500 now. FAST305 does seem to know the TBI stuff, but his reputation on the net hurts his overall advice giving rating for myself.
    SOLD: 04 z71, 3200 circle D, longtubes, Corsa sport, TBG 4l60e, 93 BB tune, 4500K HIDS, and other aftermarket stuff.

    Quote Originally Posted by 03SMURF View Post
    you have the meanest sounding 5.3 I have ever heard in person

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    Re: 14s possible tbi l31

    Quote Originally Posted by Fast305 View Post
    VA454SS did not have your issues with his 489. Don't mean to get rude, but something was wrong with your injectors or you had bad ones.

    Shouldnt two 81# at 23 psi be able to support 400hp on a bbc tbi unit

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    Re: 14s possible tbi l31

    Fast305: With the elgin cam no need for 1.6 can still run stockers just do the lt4 retainers and springs? For the price might aswell throw it in while its out on the stand

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    Re: 14s possible tbi l31

    There would not be a need for rockers with that Elgin cam. However with the LT4 springs and retainers you could add them down the road and gain some additional power.

    The 80# injectors are good for 425 hp at about 18-20 psi. A vortec top-end with the 22 lb/hr @ 58 psi poppets is good for ~400 hp.
    Last edited by Fast305; 09-02-2013 at 11:21 PM.
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

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    Re: 14s possible tbi l31

    As of now im on the hunt at the local jy for a 454 tbi unit.

    Is this all I'll need for the cam swap?

    https://sdparts.com/details/gm-perfo...parts/12495494

    https://sdparts.com/details/gm-perfo...parts/19171528

    WIll I also need the valve locks?

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    Re: 14s possible tbi l31

    Quote Originally Posted by tolow4phathoes View Post
    As of now im on the hunt at the local jy for a 454 tbi unit.

    Is this all I'll need for the cam swap?

    https://sdparts.com/details/gm-perfo...parts/12495494

    https://sdparts.com/details/gm-perfo...parts/19171528

    WIll I also need the valve locks?
    A&B Chevrolet in Kennedale had multiple 454 TBI units with the factory TBI-Spreadbore adapters on them last time I was there a few weeks ago. They literally have a large shelf full of carburetors and TBI units.

    I would pickup the locks as well. I believe the factory ones would work, but for the few bucks they cost, stronger locks are worth it for peace of mind.
    Last edited by Fast305; 09-03-2013 at 02:22 PM.
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

  12. #92
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    Re: 14s possible tbi l31

    Whats the usual price going for one of them? 5235231 thats the parts number for a 80pph? I have been spending these pass couple of days researching my butt off on tbi etc etc.. Man lots of info I should have no problem hitting my goals. No one of my question is, by switching over to maf would that greatly increase my cam selection and be atleast a tid bit more forgiving of the tuning process? Than it would be with a speed density setup.

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    A take-off from many years ago is obviously better and probably going to cost more, but I got mine (albeit with the v6 injectors), including the q-jet adapter, for $100 on Craigslist.

    Personally, I would skip the factory adapter, it doesn't seal very well to a non-stock intake, not much surface area. I went through 2 gaskets and finally cut my own from some rubber gasket stock, and used a light skinning of rtv to get it to seal, running the GMPP spreadbore/egr Vortec intake. It may or may not be warped, but it's better to just get one of the flat adapters, much more contact area to the intake manifold.



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    Last edited by Doober; 09-04-2013 at 10:44 AM.

    '92 Sierra (TBI 383/Vortecs/Comp 08-412-8/EBL/4L60/3.08s), '78 Malibu (Vortec'd 350/4-speed/2.29s), '87 Pontiac Fiero GT (2.8 v6/5-speed)


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    Re: 14s possible tbi l31

    Quote Originally Posted by Doober View Post
    A take-off from many years ago is obviously better and probably going to cost more, but I got mine (albeit with the v6 injectors), including the q-jet adapter, for $100 on Craigslist.

    Personally, I would skip the factory adapter, it doesn't seal very well to a non-stock intake, not much surface area. I went through 2 gaskets and finally cut my own from some rubber gasket stock, and used a light skinning of rtv to get it to seal, running the GMPP spreadbore/egr Vortec intake. It may or may not be warped, but it's better to just get one of the flat adapters, much more contact area to the intake manifold.



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    Never had an issue getting mine to seal with a factory insulator style quadrajet gasket for a early 80s application however it was on a 3.7 Mercruiser.
    Last edited by Fast305; 09-04-2013 at 12:30 PM.
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

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    Re: 14s possible tbi l31

    Part of the problem was first time around I used a factory style FelPro spreadbore gasket, second time was a cheapy Mr. Gasket. I've found the original style gaskets that follow the entire machined portion, but figured I'd try cutting the sheet first.

    '92 Sierra (TBI 383/Vortecs/Comp 08-412-8/EBL/4L60/3.08s), '78 Malibu (Vortec'd 350/4-speed/2.29s), '87 Pontiac Fiero GT (2.8 v6/5-speed)


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    Re: 14s possible tbi l31

    Will the tuned tbi outperformed a dialed in quadrajet in performance wise? I can considerably save money by going quadrajet and hei. Probably cost less than $200 to do it and spend the extra $300 on the cam swap. Plus you get the its a stock pos carb haha. they flow 750cfm and can be accuried with electric choke. Can support up too 450hp when modified.
    Last edited by tolow4phathoes; 09-05-2013 at 09:04 AM.

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    Registered User Doober's Avatar
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    Better cold driveability, and less parts to wear out/fail with tbi imo, but when tuned right they usually are pretty close for mpg from what I've ever read.

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    '92 Sierra (TBI 383/Vortecs/Comp 08-412-8/EBL/4L60/3.08s), '78 Malibu (Vortec'd 350/4-speed/2.29s), '87 Pontiac Fiero GT (2.8 v6/5-speed)


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    Re: 14s possible tbi l31

    Attn: Fast305

    Do you still have the chip tuning equipment? I'd like to work a deal out if you still have them.

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    Re: 14s possible tbi l31

    Quote Originally Posted by tolow4phathoes View Post
    Attn: Fast305

    Do you still have the chip tuning equipment? I'd like to work a deal out if you still have them.
    Oops, I guess you misunderstood my intent in mentioning that. I do have a good working 7747 that is chipped with a Moates adaper that I would let go very reasonably. I can get the tune pretty close for your setup within a few chips. But I still tune OBD1 stuff all the time and have no plans to sell my Burner or Datalogging tools.
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

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    Re: 14s possible tbi l31

    Quote Originally Posted by Fast305 View Post
    Oops, I guess you misunderstood my intent in mentioning that. I do have a good working 7747 that is chipped with a Moates adaper that I would let go very reasonably. I can get the tune pretty close for your setup within a few chips. But I still tune OBD1 stuff all the time and have no plans to sell my Burner or Datalogging tools.
    Ok sorry for misunderstanding.


    All I need to start tuning obd1 vehicles is just the burner, aldl cable, software laptop, extracchips and mods to ecm? If so seems I can start chip tunig for under $200 and everything new. I can leter get autoprom and w/b when funds allow.

 

 
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