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Anyone running Holley Projection or know someone who is?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Waxer, Aug 2, 2001.

  1. Waxer

    Waxer 1/2 ton status Author

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    Is anyone out there running Holley Projection or know someone who is? Does it work good for them? Was it hard to install? How dependable is it? The 2barrel version says its good for up to 300HP and my stock 350 doesnt put out that much. Any help/info would be appreciated. Thanks

    Crawlin the rocks with my K5
    <a target="_blank" href=http://www.rockreadyk5.com>http://www.rockreadyk5.com</a>
     
  2. CaptCrunch

    CaptCrunch 1/2 ton status

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    I have installed these a couple of vehicle back when I worked in a hot rod shop. A nice easy way to swap to throttle body injection, but really isn't much of a performance boost over a carb. The Accel systems are much better for performance IMO. Fairly simple to install... easier the dealing w/ the hassles of converting a stock TBI unit in, but then you pay for it. The worst part of the whole conversion is screwing around w/ the adapter plate and the linkages. The brackets sometimes don't fit quite right and take a little fabrication.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://www.geocities.com/milnerlives_2000/blazer.htm>http://www.geocities.com/milnerlives_2000/blazer.htm</a>
     
  3. Waxer

    Waxer 1/2 ton status Author

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    Well I'm not in it for performance gains, just for losing the carb problems with angles and altitude. Would it be worth it for that aspect??

    Also does it include a new type of air cleaner or is the stock one used still?

    Crawlin the rocks with my K5
    <a target="_blank" href=http://www.rockreadyk5.com>http://www.rockreadyk5.com</a>
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Get port fuel injection. A swap to TBI from a carb is a step backwards. Sure, it'll idle and start better in the winter, but it will not perform like a carb. The stock throttle body is around 500 CFM.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  5. Waxer

    Waxer 1/2 ton status Author

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    I wouldnt say its a step backward at all for my needs. What good is a carb thats better for acceleration when it dies cause your at a 30 degree camber angle? The TBI will still be running and you'll conquer whatever off angle obstacle you're looking at. I could care less about accleration as this isnt a racer, its a rock crawler and its trail only.

    Crawlin the rocks with my K5
    <a target="_blank" href=http://www.rockreadyk5.com>http://www.rockreadyk5.com</a>
     
  6. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Mixed reviews. Some people have made them work great and others have had nothing but fights.
    communities.msn.com/OffroadK5s

    Grim-Reaper
     
  7. schneggie

    schneggie 1/2 ton status

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    I just ordered a pro-jection setup and will be getting it this Friday. I will be installing it on Sunday. I can keep you posted as to how its working and so fourth if you like. I to am having the typical carb problems at angels and such.
     
  8. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    The one consistant thing people I know that have the holly say is the set up instructions for the TPS are wrong. Something about the instructions say 1 volt at rest when it should be like .5 volts. They may have corrected that now but EVERY person I know had that issue.

    It's not my damn planet monkey boy!
    <a target="_blank" href=http://communities.msn.com/OffroadK5s>communities.msn.com/OffroadK5s</a>

    Grim-Reaper
     
  9. 85m1009

    85m1009 1/2 ton status

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    I have been running the Holley projection for three years on two different trucks. I have had good luck with it. I agree it is a pain to get all the brackets to work but for the money and the time it is a good improvement over a carb for steep stuff and altitude changes. I run mine in a closed loop with the O2 sensor. Of course this is just my thoughts I know several people have had trouble with the systems. I wanted to by a tuned port set up but cost is a big factor.

    <font color=green>Steve Frisbie</font color=green>
     
  10. CaptCrunch

    CaptCrunch 1/2 ton status

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    For angles it will work fine... performance wise it will be about the same. It is pretty much a toss up to go with the Holley or just get a stock setup. The tps gave some hassles on the first one, but I kinda blamed the spacer and brackets for it. Second one went off without a hitch.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://www.geocities.com/milnerlives_2000/blazer.htm>http://www.geocities.com/milnerlives_2000/blazer.htm</a>
     
  11. realsquash

    realsquash 1/2 ton status

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    I don't know about AFI, but the guy doing it isn't an expert programmer for sure. Very few people are. I would say to go to the swap meet and get a GM tbi setup. Buy a harness and chip from howell-efi.com and you're set, no worries.

    Squash
    <a target="_blank" href=http://www.trailrunners4x4.org/users/realsquash>http://www.trailrunners4x4.org/users/realsquash</a>
     
  12. realsquash

    realsquash 1/2 ton status

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    Are you kidding? What does the accel unit do for performance? Unless you are talking port efi over TBI, but that has nothing to do with it being accel!

    Squash
    <a target="_blank" href=http://www.trailrunners4x4.org/users/realsquash>http://www.trailrunners4x4.org/users/realsquash</a>
     
  13. realsquash

    realsquash 1/2 ton status

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    Baloney! A stock 350 can't hardly use 500 cfm! Try using the 2" butterfly BBC version TBI, that is 675cfm if you needed it. Step backwards? Won't perform like a carb? you obviously don't know squat about the subject so don't post about it!

    Squash
    <a target="_blank" href=http://www.trailrunners4x4.org/users/realsquash>http://www.trailrunners4x4.org/users/realsquash</a>
     
  14. keith

    keith 1/2 ton status

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    I have heard nothing but good stuff about Holley. Plus they no longer make the 4D and 4Di system. The have the Commander 950. And still the 2 barrel set up also. No one mentioned throttle response, Better gas mileage. I did a search for these over the last month becuase I want one and There are tons of people running it. I put in Holley Projection. Seemed 90% was off road related sites that came up.

    79 Blazer 6"lift 38 SX's locked/4:56 <a target="_blank" href=http://www.keith.rockcrawler.com>www.keith.rockcrawler.com</a>
     
  15. dyeager535

    dyeager535 1 ton status Premium Member

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    I'd be curious to know about the MPG aspect. Seems there are lots here with TBI that have done something to end up with worse gas mileage than my carbed truck, with no OD.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  16. pcorssmit

    pcorssmit 1/2 ton status

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    I know several people succesfully running the Pro-Jection, mostly on V-8 Jeeps. One key is to ditch the Holley fuel pump, and run either a factory Chevy in-tank TBI pump, or an external airtech (sp) pump. Don’t wire it up the way the instructions tell you, run the pump with a full 12 volts at all times. Either follow the instructions to use a relay triggered by the computer, of trigger the relay by the key or a switch.

    The advantages over a stock retrofit swap are cost, ease of installation, and tunability for different motors or changes. The biggest disadvantage I see is that 1) you still have to adjust &amp; tune it manually, similar to a carb except here you are just turning knobs, and 2) it does not integrate the distributor into the system. These were the main reason I went with a stock setup when I did mine. There is a closed loop kit available, but I don’t know anyone running one.

    Anyone who says that TBI is a step backwards from a carb on a trail rig doesn’t have a trail rig. Or they could just be an idiot.

    Pete


    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  17. Waxer

    Waxer 1/2 ton status Author

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    Yah well the guy who said it is just a 17 year old kid. So basically he's like we all were when we were that age "Know it all punk kid" :) In reality he knows nothing but like I said, we all were there. So take his advice for what its worth.

    Crawlin the rocks with my K5
    <a target="_blank" href=http://www.rockreadyk5.com>http://www.rockreadyk5.com</a>
     
  18. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    <blockquote><font class="small">In reply to:</font><hr>

    Get port fuel injection. A swap to TBI from a carb is a step backwards. Sure, it'll idle and start better in the winter, but it will not perform like a carb. The stock throttle body is around 500 CFM.

    <hr></blockquote>
    And I would assume you would have evidence to back this up? Let's see, with TBI have better gas mileage, I'm sure the emissions are a lot better, never worry about flooding, always starts right up.


    Bubba Ray Boudreaux,
    Leader of the Advance Party for
    the CSA revolution in the PRK!
    <a target="_blank" href=http://www.handguncontrolinc.com>www.handguncontrolinc.com</a>
     
  19. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    I get about 13 stock street and 16-17 highway with my TBI. Last tank I ran under 12 and that has to be due to the aftermarket chip I put in which should be coming out soon. At least I didn't pay full price for it.

    Bubba Ray Boudreaux,
    Leader of the Advance Party for
    the CSA revolution in the PRK!
    <a target="_blank" href=http://www.handguncontrolinc.com>www.handguncontrolinc.com</a>
     
  20. realsquash

    realsquash 1/2 ton status

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    Exactly why people shouldn't buy into aftermarket chips (for a stock motor). People also thing if they get a "hot" chip, it will work better with a hotter cam, or a larger engine under the EFI. People don't learn how to set the timing, and people put adjustable FPR's on for no reason and crank it up! More fuel more power, right!

    Squash
    <a target="_blank" href=http://www.trailrunners4x4.org/users/realsquash>http://www.trailrunners4x4.org/users/realsquash</a>
     

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