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Power/speed. 5.3 chevy help please

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Tylert003, Apr 6, 2014.

  1. Tylert003

    Tylert003 New Member

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    Ok, so I'm kinda new to trucks that have any kind of power, considering my last truck was a 92 toyota pickup. Now I have a 2005 z71 4 door. Well, I race motocross, and I drag race atvs and dirt bikes in sand dunes. On both of my race bikes I've got a turbo set up, bbk, programmers, all kind of stuff. I can do almost anything to an atv or dirt bike. But I'm stupid when it comes to trucks. First off, how in the world do I fix this shutting off at 100 mess? I know people that have them so they don't shut off, I have a superchip/programmer if that helps any. Also, I tend to go to the drag strip to watch every once in a while and would love to put my 5.3 up against some of the trucks out there. Any help on turbo, super charger, or anything to add some power, remember, I'm a small engines guy, so put it in stupid terms. Price isn't a problem. Just sold my sxs and have some money to fool with
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  2. RayVoy

    RayVoy Active Member

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    You can do just about anything you want to the 5.3

    Spend some time roaming around on the web hundreds and hundreds of items out there.
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  3. ahmitchell1

    ahmitchell1 New Member

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    If it were me depending on how many miles you got on your motor. I'd do a full rebuild bore it out with a solid cam and all the other internal goodies. you should be ****tin and gettin then
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  4. Tylert003

    Tylert003 New Member

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    I've only got 140,000 miles right now and the motor runs strong besides an annoying tick. A/c off, gets louder at high rpms, pulled cap off of oil filler and noise isn't coming from motor. Anyone had this problem before? And yes, planned on doing some internals after it starts getting sluggish, but for now I'm looking for external mods or "bolt ons" right now it's got a glass pack exhaust, k&n cold air intake (just recharged 250 miles ago) and a superchip programmer.
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  5. ronnyw8

    ronnyw8 New Member

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    Many thanks for posting​
    [​IMG]
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  6. Rocketmanh5

    Rocketmanh5 New Member

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    5.3 is a strong motor but with that many miles I would look into freshening it up some. Bottom ends are solid usually if the vehicle has been well taken care of. As far as turbo goes, I wouldn't suggest a rear mounted one. STS does make some good stuff though. The programmer will remove any speed limiter.

    **********DISCLAIMER*********-it is to YOUR discretion to remove these limiters. I in no way am responsible for any:tickets, fatalities due to high speeds, wrecks, vehicle damage, or anything pertaining to the removal of the factory settings. All responsibility is taken at that point of the owner of the vehicle and its passengers.

    Covering my tail, people these days. You may not be one like that but I'm doing that on every forum even atv/utv ones.

    In your programmer there are settings that you can adjust when you plug the chip into your obd2. You want to turn the limiters off in the vehicle settings menu or whatever yours may be called.

    If you know small engines and can turbo one of them then you should be able to handle doing a 5.3. If you ever have to rebuild your motor I would suggest going with the 4.8 because of how well it handles boost. I'm a 5.3/6.2 guy but a few buddies have the 4.8 turbo'd that will sure enough scoot on by a turbo 5.3. A good turbo set up will cost around 4k or so, after that I HIGHLY suggest not driving it until you can get it on a dyno ($500-800) and getting a tune done for it($300-500). No sense in running it too lean since programmers can't adjust the parameters to which it might need.
    #6
  7. Bowtied

    Bowtied Member

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    Whats the deal with 4.8T's beating 5.3T's ? this the first i've heard of that. weight? it couldnt be weight by much, arent 5,3L's just bored/stroked 4.8's?
    #7
  8. j cat

    j cat Active Member

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    the max speed is 100MPH. that is the highest speed GM has determined for this vehicle..

    when that PCM shuts down @100 it is a shocker..
    #8
  9. JimmyA

    JimmyA Member

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    Mine went to 135mph with the rev off and got squirrely! I got off the pedal but she was going stronger and the rpm's scared me off... 55'ish. I dyno, some badass diesel engines after they have been rebuilt for our "Brothers in Arms" and would not treat my daily engine, like we do. The 5.3 can do a lot more, with the correct gearing. My 2010 is @ 3:08 but soon to add 4:11.
    #9
  10. bryane

    bryane New Member

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    The only difference between 4.8 and 5.3 is 5.3 has a longer stroke.
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  11. Bowtied

    Bowtied Member

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    [h=2][/h]
    wow, longer stroke as in a simple Rod swap or is there crank changes too? would it be a popular mod for the 4.8 guys to put longer Rods into their trucks to get a decent gain in displacement? ​
    #11
  12. 99'HEARTBEAT

    99'HEARTBEAT Moderator

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    #12
  13. RayVoy

    RayVoy Active Member

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    Nice find Mike

    One of the things that determines the compression ratio, is the combustion space when the piston is at top dead center (TDC).If what you want is to increase the compression ratio, removing some metal from the block decks will give you an increase (this effectively allows the top of the piston to get closer to the head, reducing the combustion volume). There are limits, the pistons can not touch the values when they are open.

    Applying this to going with a longer stroke, if we increase the distance the piston is pushed up the cylinder, we must be sure there is no possibly contact with the values.

    To ensure this, when the crank throw is lengthened, the rod must be shorter; therefore, the combination of a longer throw and a shorter rod should place the top of the piston in about the same place as the top of the piston was before the changes were made.

    So, what's the value of stroking an engine you ask? Well, when you lengthen the throw and shorten the rod, the combination will pull the piston farther into the cylinder. increasing the volume of air/fuel drawn into the cylinder on the intake stroke. This increased volume of mix is compressed into the same combustion space that the engine had before the mods. More fuel and air and a slight compression increase equals more power.
    #13
  14. Bowtied

    Bowtied Member

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    does it also equal more displacement? im wondering how they are gaining an additional .5 liter without changing bore, apparently by using shorter rods and dished pistons it appears from the article (although i only got thru half of it, admittedly)
    #14
  15. Rocketmanh5

    Rocketmanh5 New Member

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    Depending on the year model of the engine being done. The main difference that makes up on what I mentioned is the flat top pistons. The shorter stroke also plays a good difference if your trying to get from point A to point B quicker. A longer stroked motor does well on the other end starting to pull later than the shorter stroked motor. The 5.3 and 4.8 are pretty much equal in power and weight for stock motors. The 5.3 does exceptionally well with just a cam swap (and of course better springs and all). Just from personal experience that the 4.8 is a nice piece to use if your wanting to go down the turbo road of things. Plus a 4.8 short block is pretty cheap compared to a 5.3 or 6.0 out of a salvage yard when your on a build budget. In relation to the LQ9 I purchased to go in a project '88 I wish I would have went on with a 4.8 and a small turbo and that would have made way more power than what I was trying to squeeze running 110 octane and head work.
    #15

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